View Filing Data

Other comprehensive income (loss), net change related to:

$ 571

$ (723)

$ 840

Fuel derivative financial instruments

(340)

Employee benefit plans

1,626

(730)

(464)

Investments and other

Total comprehensive income (loss), net

^[1]

1,654

(629)

(804)

2,225

(1,352)

Other comprehensive income (loss), net change related to:

654

(661)

850

Fuel derivative financial instruments

(340)

Employee benefit plans

1,626

(730)

(464)

Investments and other

(2)

Total comprehensive income (loss), net

1,661

(628)

(806)

$ 2,315

$ (1,289)

$ 44

[1]	UAL and United amounts are substantially the same except for an additional $6 million of income tax benefit at United in 2013. In addition, United had additional (losses) gains related to investments and other of $(2) million, $1 million and $1 million in 2011, 2012 and 2013, respectively.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.18)
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.22)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e565-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 19
-Article 5

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
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Cash and cash equivalents

Consolidated Balance Sheets - USD ($)
$ in Millions

Dec. 31, 2013

Dec. 31, 2012

Current assets:

$ 3,220

$ 4,770

Short-term investments

1,901

1,773

Total unrestricted cash, cash equivalents and short-term investments

5,121

6,543

Receivables, less allowance for doubtful accounts

1,503

1,338

Aircraft fuel, spare parts and supplies, less obsolescence allowance

667

695

Prepaid expenses and other

676

543

704

865

Total current assets

8,702

10,049

Operating property and equipment: Owned-

18,786

17,561

Operating property and equipment - owned, gross

3,687

3,269

22,473

20,830

Less-Accumulated depreciation and amortization

(6,080)

(5,006)

Operating property and equipment - owned, net

16,393

15,824

Purchase deposits for flight equipment

706

462

Capital leases-

1,490

1,484

Operating property and equipment - capital leases, gross

307

235

1,797

1,719

Less-Accumulated amortization

(849)

(713)

Operating property and equipment - capital leases, net

948

1,006

Total property, plant, and equipment, net

18,047

17,292

Other assets:

Goodwill

4,523

Intangibles, less accumulated amortization

4,436

4,597

364

382

Other, net

740

785

Other assets total

10,063

10,287

Total assets

36,812

37,628

Current liabilities:

Advance ticket sales

3,405

3,360

Accrued salaries and benefits

2,369

2,364

Accounts payable

2,087

2,312

1,696

1,763

Current maturities of long-term debt

1,368

1,812

Current maturities of capital leases

117

^[1]

122

Total current liabilities

1,065

1,085

12,107

12,818

Long-term debt

10,171

10,440

Long-term obligations under capital leases

753

^[1]

792

Other liabilities and deferred credits:

Postretirement benefit liability

2,535

2,756

1,703

2,614

Pension liability

1,650

2,400

Advanced purchase of miles

1,338

1,537

Lease fair value adjustment, net

1,662

1,543

626

881

Total non-current liabilities

1,283

1,366

10,797

13,097

Commitments and contingencies

Stockholder's equity:

Preferred stock

Common stock

Additional capital invested

7,425

7,145

Accumulated deficit

(5,015)

(5,586)

Stock held in treasury, at cost

(38)

(35)

Accumulated other comprehensive income (loss)

^[2]

608

(1,046)

Total stockholders' equity

2,984

481

Total liabilities and stockholders' equity (deficit)

36,812

37,628

Cash and cash equivalents

Current assets:

3,214

4,765

Short-term investments

1,901

1,773

Total unrestricted cash, cash equivalents and short-term investments

5,115

6,538

Receivables, less allowance for doubtful accounts

1,503

1,338

Aircraft fuel, spare parts and supplies, less obsolescence allowance

667

695

Receivables from related parties

674

546

226

Prepaid expenses and other

705

841

Total current assets

8,695

10,249

Operating property and equipment: Owned-

18,786

17,561

Operating property and equipment - owned, gross

3,687

3,269

22,473

20,830

Less-Accumulated depreciation and amortization

(6,080)

(5,006)

Operating property and equipment - owned, net

16,393

15,824

Purchase deposits for flight equipment

706

462

Capital leases-

1,490

1,484

Operating property and equipment - capital leases, gross

307

235

1,797

1,719

Less-Accumulated amortization

(849)

(713)

Operating property and equipment - capital leases, net

948

1,006

Total property, plant, and equipment, net

18,047

17,292

Other assets:

Goodwill

4,523

Intangibles, less accumulated amortization

4,436

4,597

364

382

Other, net

1,221

1,052

Other assets total

10,544

10,554

Total assets

37,286

38,095

Current liabilities:

Advance ticket sales

3,405

3,360

Accrued salaries and benefits

2,369

2,364

Accounts payable

2,092

2,316

1,696

1,763

Current maturities of long-term debt

1,368

1,812

Current maturities of capital leases

117

122

Payables to related parties

114

Total current liabilities

1,064

1,140

12,225

12,952

Long-term debt

10,020

10,038

Long-term obligations under capital leases

753

792

Other liabilities and deferred credits:

Postretirement benefit liability

2,535

2,756

1,703

2,614

Pension liability

1,650

2,400

Advanced purchase of miles

1,338

1,537

Lease fair value adjustment, net

1,661

1,470

626

881

Total non-current liabilities

1,552

1,494

11,065

13,152

Commitments and contingencies

Stockholder's equity:

Additional capital invested

7,590

7,611

Accumulated deficit

(4,743)

(5,397)

Accumulated other comprehensive income (loss)

608

(1,053)

Receivable from related parties

(232)

Total stockholders' equity

3,223

1,161

Total liabilities and stockholders' equity (deficit)

$ 37,286

$ 38,095

[1]	As of December 31, 2013, United's aircraft capital lease minimum payments relate to leases of 47 mainline and 38 regional aircraft as well as to leases of nonaircraft assets. Imputed interest rate ranges are 4.8% to 18.5%.
[2]	UAL and United amounts are substantially the same except for an additional $6 million of income tax benefit at United in 2013. In addition, United had additional (losses) gains related to investments and other of $(2) million, $1 million and $1 million in 2011, 2012 and 2013, respectively.

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2013	Dec. 31, 2012
Receivables, allowance for doubtful accounts	$ 13	$ 13
Aircraft fuel, spare parts and supplies, obsolescence allowance	162	125
Intangibles, accumulated amortization	$ 933	$ 792
Common stock, par value	$ 0.01	$ 0.01
Common shares, authorized	1,000,000,000	1,000,000,000
Common shares, outstanding	362,283,555	332,472,779
United Airlines, Inc.
Receivables, allowance for doubtful accounts	$ 13	$ 13
Aircraft fuel, spare parts and supplies, obsolescence allowance	162	125
Intangibles, accumulated amortization	$ 933	$ 792
Common stock, par value	$ 0.01	$ 0.01
Common shares, authorized	1,000	1,000
Common shares, issued	1,000	1,000
Common shares, outstanding	1,000	1,000

Statements of Consolidated Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flows from Operating Activities:
Net income (loss)	$ 571	$ (723)	$ 840
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities -
Depreciation and amortization	1,689	1,522	1,547
Debt discount and lease fair value amortization	(188)	(247)	(186)
Amortization of capitalized financing costs	73	52	52
Pension and postretirement amortization	42	18	(23)
Special charges, non-cash portion	50	389	46
Deferred income taxes	(14)	13	(6)
Share-based compensation	11	14	17
Other operating activities	80	48	25
Changes in operating assets and liabilities -
Decrease in frequent flyer deferred revenue and advanced purchase of miles	(415)	(712)	(110)
Increase (decrease) in accounts payable	(265)	285	177
(Increase) decrease in other assets	164	(484)	(181)
Increase (decrease) in other liabilities	(201)	415	243
Increase in receivables	(142)	(21)	(87)
Unrealized (gain) loss on fuel derivatives and change in related pending settlements	(56)	120	(2)
Increase in advance ticket sales	45	246	115
Increase in fuel hedge collateral			(59)
Net cash provided by operating activities	1,444	935	2,408
Cash Flows from Investing Activities:
Capital expenditures	(2,164)	(2,016)	(840)
Proceeds from sale of property and equipment	152	183	123
Increase in short-term and other investments, net	(120)	(245)	(898)
(Increase) decrease in restricted cash, net	52	122	(185)
Other, net	58	(1)	1
Net cash used in investing activities	(2,022)	(1,957)	(1,799)
Cash Flows from Financing Activities:
Payments of long-term debt	(2,185)	(1,392)	(2,367)
Proceeds from issuance of long-term debt	1,423	1,121	152
Principal payments under capital leases	(134)	(125)	(250)
Capitalized financing costs	(103)	(71)	(8)
Proceeds from exercise of stock options	29	17	26
Purchases of treasury stock	(3)	(4)
Other	1		15
Net cash used in financing activities	(972)	(454)	(2,432)
Net decrease in cash and cash equivalents	(1,550)	(1,476)	(1,823)
Cash and cash equivalents at beginning of year	4,770	6,246	8,069
Cash and cash equivalents at end of year	3,220	4,770	6,246
United Airlines, Inc.
Cash Flows from Operating Activities:
Net income (loss)	654	(661)	850
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities -
Depreciation and amortization	1,689	1,522	1,547
Debt discount and lease fair value amortization	(178)	(239)	(186)
Amortization of capitalized financing costs	73	52	52
Pension and postretirement amortization	42	18	(23)
Special charges, non-cash portion	50	389	46
Deferred income taxes	1	13	(5)
Share-based compensation	11	14	18
Other operating activities	11	4	48
Changes in operating assets and liabilities -
Decrease in frequent flyer deferred revenue and advanced purchase of miles	(415)	(712)	(110)
Increase (decrease) in accounts payable	(265)	285	177
(Increase) decrease in other assets	163	(484)	(200)
Increase (decrease) in other liabilities	(203)	422	263
Increase in receivables	(142)	(21)	(87)
Unrealized (gain) loss on fuel derivatives and change in related pending settlements	(56)	120	(2)
Increase in advance ticket sales	45	246	115
Increase in fuel hedge collateral			(59)
Increase in intercompany receivables	(5)	(9)	(83)
Increase (decrease) in intercompany payables	(34)	(28)	46
Net cash provided by operating activities	1,441	931	2,407
Cash Flows from Investing Activities:
Capital expenditures	(2,164)	(2,016)	(840)
Proceeds from sale of property and equipment	152	183	123
Increase in short-term and other investments, net	(120)	(240)	(898)
(Increase) decrease in restricted cash, net	52	121	(185)
Other, net	57		2
Net cash used in investing activities	(2,023)	(1,952)	(1,798)
Cash Flows from Financing Activities:
Payments of long-term debt	(2,185)	(1,392)	(2,367)
Proceeds from issuance of long-term debt	1,423	1,121	152
Principal payments under capital leases	(134)	(125)	(250)
Capitalized financing costs	(103)	(71)	(8)
Proceeds from exercise of stock options	29	17	26
Other	1	(4)	15
Net cash used in financing activities	(969)	(454)	(2,432)
Net decrease in cash and cash equivalents	(1,551)	(1,475)	(1,823)
Cash and cash equivalents at beginning of year	4,765	6,240	8,063
Cash and cash equivalents at end of year	$ 3,214	$ 4,765	$ 6,240

Statements of Consolidated Stockholder's Equity - USD ($)
shares in Millions, $ in Millions

Total

United Airlines, Inc.

Common Stock

Additional Capital Invested

United Airlines, Inc.

Treasury Stock

Accumulated Deficit

United Airlines, Inc.

Accumulated Other Comprehensive Income (Loss)

United Airlines, Inc.

Receivable from parent

United Airlines, Inc.

Beginning Balance (in shares) at Dec. 31, 2010

328

Beginning Balance at Dec. 31, 2010

$ 1,727

$ 2,331

$ 3

$ 7,071

$ 7,536

$ (31)

$ (5,703)

$ (5,586)

$ 387

$ 381

Other comprehensive income (loss)

840

850

840

850

(804)

^[1]

(806)

(804)

(806)

Share-based compensation

$ 17

Proceeds from exercise of stock options (in shares)

Proceeds from exercise of stock options

$ 26

UAL contribution related to stock plans

Ending Balance (in shares) at Dec. 31, 2011

331

Ending Balance at Dec. 31, 2011

1,806

2,419

$ 3

7,114

7,580

(31)

(4,863)

(4,736)

(417)

(425)

Other comprehensive income (loss)

(723)

(661)

(723)

(661)

(629)

^[1]

(628)

(629)

(628)

Share-based compensation

$ 14

Proceeds from exercise of stock options (in shares)

Proceeds from exercise of stock options

$ 17

UAL contribution related to stock plans

Treasury stock acquisitions

(4)

Ending Balance (in shares) at Dec. 31, 2012

332

Ending Balance at Dec. 31, 2012

481

1,161

$ 3

7,145

7,611

(35)

(5,586)

(5,397)

(1,046)

(1,053)

Other comprehensive income (loss)

571

654

571

654

1,654

^[1]

1,661

1,654

1,661

Shares issued in exchange for redemption of convertible debt (in shares)

Shares issued in exchange for redemption of convertible debt

241

$ 1

240

Income taxes

(68)

Contribution of asset by UAL

Share-based compensation

$ 11

Proceeds from exercise of stock options (in shares)

Proceeds from exercise of stock options

$ 29

UAL contribution related to stock plans

Reclassification of related party receivables to equity

(232)

$ (232)

Treasury stock acquisitions

(3)

Ending Balance (in shares) at Dec. 31, 2013

362

Ending Balance at Dec. 31, 2013

$ 2,984

$ 3,223

$ 4

$ 7,425

$ 7,590

$ (38)

$ (5,015)

$ (4,743)

$ 608

$ (232)

[1]	UAL and United amounts are substantially the same except for an additional $6 million of income tax benefit at United in 2013. In addition, United had additional (losses) gains related to investments and other of $(2) million, $1 million and $1 million in 2011, 2012 and 2013, respectively.

Significant Accounting Policies

12 Months Ended

Dec. 31, 2013

Significant Accounting Policies

NOTE 1 - SIGNIFICANT ACCOUNTING POLICIES

(a)

Use of Estimates and Reclassifications—The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make estimates and assumptions that affect the amounts reported in these financial statements and accompanying notes. Actual results could differ from those estimates.

Certain prior year cash flows from operating activities have been reclassified to conform to the current year presentation.

(b)

Passenger Revenue Recognition—The value of unused passenger tickets is included in current liabilities as advance ticket sales. The Company records passenger ticket sales and tickets sold by other airlines for use on United as passenger revenue when the transportation is provided or upon estimated breakage. Tickets sold by other airlines are recorded at the estimated values to be billed to the other airlines. Differences between amounts billed and the actual amounts may be rejected and rebilled or written off if the amount recorded was different from the original estimate. When necessary, the Company records a reserve against our interline billings and payables if historical experience indicates that these amounts are different. Non-refundable tickets generally expire on the date of the intended flight, unless the date is extended by notification from the customer on or before the intended flight date.

Fees charged in association with changes or extensions to non-refundable tickets are recorded as other revenue at the time the fee is incurred. The fare on the changed ticket, including any additional collection, is deferred and recognized in accordance with our transportation revenue recognition policy at the time the transportation is provided. Change fees related to non-refundable tickets are considered a separate transaction from the air transportation because they represent a charge for the Company’s additional service to modify a previous sale. Therefore, the pricing of the change fee and the initial customer order are separately determined and represent distinct earnings processes. Refundable tickets expire after one year.

The Company records an estimate of breakage revenue on the flight date for tickets that will expire unused. These estimates are based on the evaluation of actual historical results and forecasted trends.

The Company recognizes cargo and other revenue as service is provided.

Under our capacity purchase agreements (“CPAs”) with regional carriers, we purchase all of the capacity related to aircraft covered by the contracts and are responsible for selling all of the related seat inventory. We record the passenger revenue and related expenses as separate operating revenue and expense in the consolidated statement of operations.

Accounts receivable primarily consist of amounts due from credit card companies and customers of our aircraft maintenance and cargo transportation services. We provide an allowance for uncollectible accounts equal to the estimated losses expected to be incurred based on historical write-offs and other specific analyses. Bad debt expense and write-offs were not material for the years ended December 31, 2013, 2012 and 2011.

(c)

Frequent Flyer Accounting—United has a frequent flyer program that is designed to increase customer loyalty. Program participants earn mileage credits (“miles”) by flying on United and certain other participating airlines. Program participants can also earn miles through purchases from other non-airline partners that participate in United’s loyalty program. We sell miles to these partners, which include credit card issuers, retail merchants, hotels, car rental companies and our participating airline partners. Miles can be redeemed for free (other than taxes and government imposed fees), discounted or upgraded air travel and non-travel awards. The Company records its obligation for future award redemptions using a deferred revenue model.

Miles Earned in Conjunction with Flights

In the case of the sale of air services, the Company recognizes a portion of the ticket sales as revenue when the air transportation occurs and defers a portion of the ticket sale representing the value of the related miles as a multiple-deliverable revenue arrangement.

The Company determines the estimated selling price of the air transportation and miles as if each element is sold on a separate basis. The total consideration from each ticket sale is then allocated to each of these elements individually on a pro rata basis. The Company’s estimated selling price of miles is based on the price we sell miles to Star Alliance partners in our reciprocal frequent flyer agreements as the best estimate of selling price for these miles.

On December 9, 2013, US Airways and American Airlines closed their merger transaction and, as a result of the merger transaction, we anticipate US Airways will exit Star Alliance on March 30, 2014. Effective with the exit date of US Airways from Star Alliance, the Company will update its estimated selling price for miles to using the equivalent ticket value less fulfillment discount, as the estimated selling price for miles. The equivalent ticket value used as the basis for the estimated selling price of miles is based on the prior 12 months’ weighted average equivalent ticket value of similar fares as those used to settle award redemptions while taking into consideration such factors as redemption pattern, cabin class and geographic region. Management believes this change is a change in estimate, and as such, the change will be applied on a prospective basis. The estimated impact of this change on consolidated revenue is not expected to be material in 2014.

Co-branded Credit Card Partner Mileage Sales

United also has a significant contract to sell frequent flyer miles to its co-branded credit card partner, Chase Bank USA, N.A. (“Chase”). On June 9, 2011, this contract was modified and United entered into The Consolidated Amended and Restated Co-Branded Card Marketing Services Agreement (the “Co-Brand Agreement”) with Chase.

United identified five revenue elements in the Co-Brand Agreement: the air transportation element represented by the value of the mile (generally resulting from its redemption for future air transportation and whose fair value is described above); use of the United brand and access to frequent flyer member lists; advertising; baggage services; and airport lounge usage (together, excluding “the air transportation element”, the “marketing-related deliverables”).

The fair value of the elements is determined using management’s estimated selling price of each element. The objective of using the estimated selling price based methodology is to determine the price at which we would transact a sale if the product or service were sold on a stand-alone basis. Accordingly, we determine our best estimate of selling price by considering multiple inputs and methods including, but not limited to, discounted cash flows, brand value, volume discounts, published selling prices, number of miles awarded and number of miles redeemed. The Company estimated the selling prices and volumes over the term of the Co-Brand Agreement in order to determine the allocation of proceeds to each of the multiple elements to be delivered. The method for determining the selling price of the mile component is changing March 30, 2014, as described above. We also evaluate volumes on an annual basis, which may result in a change in the allocation of estimated selling price on a prospective basis.

The Company records passenger revenue related to the air transportation element when the transportation is delivered. The other elements are generally recognized as Other operating revenue when earned.

Expiration of Miles

The Company accounts for miles sold and awarded that will never be redeemed by program members, which we refer to as breakage. The Company reviews its breakage estimates annually based upon the latest available information regarding redemption and expiration patterns. The Company re-evaluated its population breakage estimates for a portion of its miles, which were previously not subject to an expiration policy, and increased the estimate of miles in the population expected to ultimately expire.

The Company’s estimate of the expected expiration of miles requires significant management judgment. Current and future changes to expiration assumptions or to the expiration policy, or to program rules and program redemption opportunities, may result in material changes to the deferred revenue balance as well as recognized revenues from the programs. Effective March 30, 2014, the Company will incorporate a fulfillment discount into its best estimate of selling price which incorporates the expected redemption of miles.

Other Information

The following table provides additional information related to the frequent flyer program (in millions):


Year Ended December 31,	Cash Proceeds from Miles Sold		Other Revenue Recognized Upon Award of Miles to Third-Party Customers (a)		Increase in Frequent Flyer Deferred Revenue for Miles Awarded (b)		Increase (Decrease) in Advanced Purchase of Miles (c)
2013	$	2,903	$	903	$	2,174	$	(174)
2012		2,852		816		2,036		—
2011		3,121		566		2,357		198

(a) This amount represents other revenue recognized during the period from the sale of miles to third parties, representing the marketing-related deliverable services component of the sale.
(b) This amount represents the increase to frequent flyer deferred revenue during the period.
(c) This amount represents the net increase (decrease) in the advance purchase of miles obligation due to cash payments for the sale of miles in excess of (less than) miles awarded to customers.

(d)	Cash and Cash Equivalents and Restricted Cash— Highly liquid investments with a maturity of three months or less on their acquisition date are classified as cash and cash equivalents.

Restricted cash primarily includes cash collateral associated with workers’ compensation obligations, reserves for institutions that process credit card ticket sales and cash collateral received from fuel hedge counterparties. Restricted cash is classified as short-term or long-term in the consolidated balance sheets based on the expected timing of return of the assets to the Company. Airline industry practice includes classification of restricted cash flows as either investing cash flows or operating cash flows. Cash flows related to restricted cash activity are classified as investing activities because the Company considers restricted cash arising from these activities similar to an investment.

(e)

Short-term Investments—Short-term investments are classified as available-for-sale and are stated at fair value. Realized gains and losses on sales of investments are reflected in nonoperating income (expense) in the consolidated statements of operations. Unrealized gains and losses on available-for-sale securities are reflected as a component of accumulated other comprehensive income/loss.

(f)	Aircraft Fuel, Spare Parts and Supplies—The Company accounts for aircraft fuel, spare parts and supplies at average cost and provides an obsolescence allowance for aircraft spare parts and supplies.

(g)

Property and Equipment—The Company records additions to owned operating property and equipment at cost when acquired. Property under capital leases and the related obligation for future lease payments are recorded at an amount equal to the initial present value of those lease payments. Modifications that enhance the operating performance or extend the useful lives of airframes or engines are capitalized as property and equipment. It is the Company’s policy to record compensation from delays in delivery of aircraft as a reduction of the cost of the related aircraft.

Depreciation and amortization of owned depreciable assets is based on the straight-line method over the assets’ estimated useful lives. Leasehold improvements are amortized over the remaining term of the lease, including estimated facility renewal options when renewal is reasonably assured at key airports, or the estimated useful life of the related asset, whichever is less. Properties under capital leases are amortized on the straight-line method over the life of the lease or, in the case of certain aircraft, over their estimated useful lives, whichever is shorter. Amortization of capital lease assets is included in depreciation and amortization expense. The estimated useful lives of property and equipment are as follows:


	Estimated Useful Life (in years)
Aircraft and related rotable parts		25 to 30
Buildings		25 to 45
Other property and equipment		4 to 15
Computer software		5
Building improvements		1 to 40

As of December 31, 2013 and 2012, the Company had a carrying value of computer software of $290 million and $302 million, respectively. For the years ended December 31, 2013, 2012 and 2011, the Company’s depreciation expense related to computer software was $72 million, $81 million and $133 million, respectively. Aircraft and aircraft parts were assumed to have residual values with a range of 10% to 11% of original cost, depending on type, and other categories of property and equipment were assumed to have no residual value.

(h)

Maintenance and Repairs—The cost of maintenance and repairs, including the cost of minor replacements, is charged to expense as incurred, except for costs incurred under our power-by-the-hour (“PBTH”) engine maintenance agreements. PBTH contracts transfer certain risk to third-party service providers and fix the amount we pay per flight hour or per cycle to the service provider in exchange for maintenance and repairs under a predefined maintenance program. Under PBTH agreements, the Company recognizes expense at a level rate per engine hour, unless the level of service effort and the related payments during the period are substantially consistent, in which case the Company recognizes expense based on the amounts paid.

(i)	Lease Fair Value Adjustments—Lease fair value adjustments, which arose from recording operating leases at fair value under fresh start accounting or the Merger, are amortized on a straight line basis over the related lease term.

(j)	Regional Capacity Purchase—Payments made to regional carriers under CPAs are reported in Regional capacity purchase in our consolidated statements of operations.

(k)	Advertising—Advertising costs, which are included in Other operating expenses, are expensed as incurred. Advertising expenses were $178 million, $154 million and $142 million for the years ended December 31, 2013, 2012 and 2011, respectively.

(l)

Intangibles—The Company has finite-lived and indefinite-lived intangible assets, including goodwill. As of December 31, 2013, goodwill represents the excess purchase price over the fair values of tangible and identifiable intangible assets acquired and liabilities assumed from Continental in the Merger. Finite-lived intangible assets are amortized over their estimated useful lives. Goodwill and indefinite-lived intangible assets are not amortized but are reviewed for impairment annually or more frequently if events or circumstances indicate that the asset may be impaired. Goodwill and indefinite-lived assets are reviewed for impairment on an annual basis as of October 1, or on an interim basis whenever a triggering event occurs. See Notes 2 and 17 for additional information related to intangibles.

(m)

Long-Lived Asset Impairments—The Company evaluates the carrying value of long-lived assets and intangible assets subject to amortization whenever events or changes in circumstances indicate that an impairment may exist. For purposes of this testing, the Company has generally identified the aircraft fleet type as the lowest level of identifiable cash flows for purposes of testing aircraft for impairment. An impairment charge is recognized when the asset’s carrying value exceeds its net undiscounted future cash flows and its fair market value. The amount of the charge is the difference between the asset’s carrying value and fair market value. See Note 17 for information related to asset impairments.

(n)

Share-Based Compensation—The Company measures the cost of employee services received in exchange for an award of equity instruments based on the grant-date fair value of the award. The resulting cost is recognized over the period during which an employee is required to provide service in exchange for the award, usually the vesting period. Obligations for restricted stock units (“RSUs”) are remeasured at fair value throughout the requisite service period on the last day of each reporting period based upon UAL’s stock price. In addition to the service requirement, certain RSUs have performance metrics that must be achieved prior to vesting. These awards are accrued based on the expected level of achievement at each reporting period. A cumulative adjustment is recorded on the last day of each reporting period to adjust compensation expense based on both UAL’s stock price and the then current level of expected performance achievement for the performance-based awards. See Note 5 for additional information on UAL’s share-based compensation plans.

(o)	Ticket Taxes—Certain governmental taxes are imposed on the Company’s ticket sales through a fee included in ticket prices. The Company collects these fees and remits them to the appropriate government agency. These fees are recorded on a net basis (excluded from operating revenue).

(p)

Retirement of Leased Aircraft—The Company accrues for estimated lease costs over the remaining term of the lease at the present value of future minimum lease payments, net of estimated sublease rentals (if any), in the period that aircraft are permanently removed from service. When reasonably estimable and probable, the Company estimates maintenance lease return condition obligations for items such as minimum aircraft and engine conditions specified in leases and accrues these amounts over the lease term while the aircraft are operating, and any remaining unrecognized estimated obligations are accrued in the period that an aircraft is removed from service.

(q)

Uncertain Income Tax Positions—The Company has recorded reserves for income taxes and associated interest that may become payable in future years. Although management believes that its positions taken on income tax matters are reasonable, the Company nevertheless has established tax and interest reserves in recognition that various taxing authorities may challenge certain of the positions taken by the Company, potentially resulting in additional liabilities for taxes and interest. The Company’s uncertain tax position reserves are reviewed periodically and are adjusted as events occur that affect its estimates, such as the availability of new information, the lapsing of applicable statutes of limitation, the conclusion of tax audits, the measurement of additional estimated liability, the identification of new tax matters, the release of administrative tax guidance affecting its estimates of tax liabilities, or the rendering of relevant court decisions. See Note 7 for further information related to uncertain income tax positions.

(r)

Labor Costs—The Company records expenses associated with amendable labor agreements when the employee group has earned the compensation and the amounts are probable and estimable. These include costs associated with lump sum cash payments that would be made in conjunction with the ratification of labor agreements. To the extent these upfront costs are in lieu of future pay increases, they would be capitalized and amortized over the term of the labor agreements. If not, these amounts would be expensed once earned and when they become probable and estimable.

(s)

Third-Party Business—The Company has third-party business revenue that includes fuel sales, catering, ground handling, maintenance services and frequent flyer award non-air redemptions, and third-party business revenue is recorded in other revenue. The Company has a contract to sell aircraft fuel to a third party which is earnings-neutral but results in revenue and expense, specifically cost of sale which is unrelated to the operation of the airline. The Company also incurs third-party business expenses, such as maintenance, ground handling and catering services for third parties, fuel sales and non-air mileage redemptions, and those third-party business expenses are recorded in Other operating expenses.

(t)	Related party receivables—United has receivables from affiliates of $232 million that are classified against stockholder’s equity as of December 31, 2013 as a result of an anticipated distribution of the amount via an equity transaction planned in early 2014.

(u)

Recently Issued Accounting Standards—In February 2013, the Financial Accounting Standards Board issued Accounting Standards Update No. 2013-02 (“ASU 2013-02”), Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. Some of the key amendments require the Company to present, either on the face of the statement of operations or in the notes to the consolidated financial statements, the effects on the line items of net income of significant amounts reclassified out of accumulated other comprehensive income, but only if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. For amounts that are not required to be reclassified in their entirety to net income, the Company is required to cross-reference to other disclosures that provide additional detail about those amounts. ASU 2013-02 became effective for the Company’s annual and interim periods beginning January 1, 2013, and the required disclosures are included in Note 6 of this report.

Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2013

Goodwill and Other Intangible Assets

NOTE 2 - GOODWILL AND OTHER INTANGIBLE ASSETS

The following table presents information about the Company’s goodwill and other intangible assets at December 31 (in millions):


		2013				2012
Item	Asset life (a)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Goodwill		$	4,523			$	4,523

Finite-lived intangible assets
Airport slots and gates	8	$	98	$	88	$	99	$	75
Hubs	20		145		59		145		52
Patents and tradenames	3		108		108		108		99
Frequent flyer database (b)	22		1,177		536		1,177		447
Contracts	13		167		86		167		75
Other	25		109		56		109		44

Total		$	1,804	$	933	$	1,805	$	792

Indefinite-lived intangible assets
Airport slots and gates		$	963			$	981
Route authorities			1,605				1,606
Tradenames and logos			593				593
Alliances			404				404

Total		$	3,565			$	3,584

(a) Weighted average life expressed in years.

(b) The frequent flyer database is amortized based on an accelerated amortization schedule to reflect utilization of the assets. Estimated cash flows correlating to the expected attrition rate of customers in the frequent flyer database is considered in the determination of the amortization schedules.

Amortization expense in 2013, 2012 and 2011 was $142 million, $121 million and $169 million, respectively. Projected amortization expense in 2014, 2015, 2016, 2017 and 2018 is $128 million, $106 million, $92 million, $81 million and $72 million, respectively.

See Note 17 for information related to impairment of intangible assets.

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

Common Stockholders' Equity and Preferred Securities

Common Stockholders' Equity and Preferred Securities

12 Months Ended

Dec. 31, 2013

NOTE 3 - COMMON STOCKHOLDERS’ EQUITY AND PREFERRED SECURITIES

At December 31, 2013, approximately 44 million shares of UAL’s common stock were reserved for future issuance related to the conversion of convertible debt securities and the issuance of equity based awards under the Company’s incentive compensation plans.

As of December 31, 2013, UAL had two shares of junior preferred stock (par value $0.01 per share) outstanding. In addition, UAL is authorized to issue 250 million shares of preferred stock (without par value) under UAL’s amended and restated certificate of incorporation.

In January and February 2014, holders of substantially all of the remaining $156 million outstanding principal amount of the 4.5% Senior Limited-Subordination Convertible Notes due 2021 (the “4.5% Notes”) exercised their right to convert such notes into shares of UAL common stock at a conversion rate of 30.6419 shares of UAL common stock per $1,000 principal amount of 4.5% Notes. See Note 11 for information related to exercises of the 4.5% Notes.

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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Earnings (Loss) Per Share

Earnings (Loss) Per Share

12 Months Ended

Dec. 31, 2013

NOTE 4 - EARNINGS (LOSS) PER SHARE

The computations of UAL’s basic and diluted earnings (loss) per share and the number of securities that have been excluded from the computation of diluted earnings per share amounts because they were antidilutive are set forth below (in millions, except per share amounts):


	2013		2012		2011
Basic earnings (loss) per share:
Net income (loss)	$	571	$	(723)	$	840
Less: Income allocable to participating securities		(2)		—		(3)

Earnings (loss) available to common stockholders	$	569	$	(723)	$	837


Basic weighted-average shares outstanding		348		331		329

Earnings (loss) per share, basic	$	1.64	$	(2.18)	$	2.54


Diluted earnings (loss) per share:
Earnings (loss) available to common stockholders	$	569	$	(723)	$	837
Effect of dilutive securities		26		—		27

Earnings (loss) available to common stockholders including the effect of dilutive securities	$	595	$	(723)	$	864


Diluted shares outstanding:
Basic weighted-average shares outstanding		348		331		329
Effect of convertible notes		42		—		52
Effect of employee stock options		—		—		2

Diluted weighted-average shares outstanding		390		331		383

Earnings (loss) per share, diluted	$	1.53	$	(2.18)	$	2.26


Potentially dilutive shares excluded from diluted per share amounts:
Restricted stock and stock options		3		5		6
Convertible notes		4		61		15

		7		66		21

See Note 11 for information related to the exchange of shares for redemption of convertible debt.

Share-Based Compensation Plans

12 Months Ended

Dec. 31, 2013

Share-Based Compensation Plans

NOTE 5 - SHARE-BASED COMPENSATION PLANS

UAL maintains several share-based compensation plans. These plans provide for grants of qualified and non-qualified stock options, stock appreciation rights, restricted stock awards, RSUs, performance compensation awards, performance units, cash incentive awards and other types of equity-based and equity-related awards.

All awards are recorded as equity or a liability in the Company’s consolidated balance sheets. The share-based compensation expense is directly recorded in salaries and related costs or integration-related expense.

In February 2013, UAL granted share-based compensation awards pursuant to the United Continental Holdings, Inc. 2008 Incentive Compensation Plan. These share-based compensation awards include approximately 0.5 million shares of restricted stock and 0.5 million of RSUs that vest pro-rata over three years on the anniversary of the grant date. The time vested RSUs are cash-settled based on the 20-day average closing price of UAL common stock immediately prior to the vesting date. In addition, UAL granted 1.3 million RSUs that will vest based on UAL’s return on invested capital for the three years ending December 31, 2015. If this performance condition is achieved, cash payments will be made after the end of the performance period based on the 20-day average closing price of UAL common stock immediately prior to the vesting date. The Company accounts for the RSUs as liability awards.

The following table provides information related to UAL’s share-based compensation plan cost for the years ended December 31 (in millions):


	2013		2012		2011
Compensation cost: (a)
RSUs	$	88	$	37	$	18
Restricted stock		11		13		12
Share-based awards converted to cash awards		1		6		19
Stock options		—		1		5

Total	$	100	$	57	$	54

(a) All compensation cost is recorded to Salaries and related costs, with the exception of $9 million, $9 million and $17 million in 2013, 2012 and 2011, respectively, that was recorded in integration-related costs as a component of special charges.

The table below summarizes UAL’s unearned compensation and weighted-average remaining period to recognize costs for all outstanding share-based awards for the year ended December 31, 2013 (in millions, except as noted):


	Unearned Compensation		Weighted- Average Remaining Period (in years)
RSUs	$	36		1.3
Restricted stock		8		1.4
Stock options		—		0.6

Total	$	44

RSUs and Restricted Stock. All outstanding RSUs are settled in cash. As of December 31, 2013, UAL had recorded a liability of $118 million related to its RSUs. UAL paid $29 million, $35 million and $57 million related to its share-based liabilities during 2013, 2012 and 2011, respectively.

The table below summarizes UAL’s RSUs and restricted stock activity for the years ended December 31 (shares in millions):


	RSUs		Restricted Stock		Weighted- Average Grant Price
Non-vested at December 31, 2010		—		1	$	17.20
Granted		4		1		23.87
Vested		—		(1)		22.26
Surrendered		(1)		—		23.95

Non-vested at December 31, 2011		3		1		23.33
Granted		2		1		24.01
Vested		—		(1)		23.05
Surrendered		(1)		—		24.01

Non-vested at December 31, 2012		4		1		23.94
Granted		2		1		25.98
Vested		(1)		(1)		23.93
Surrendered		—		—		24.76

Non-vested at December 31, 2013		5		1		25.02

The fair value of RSUs and restricted stock vested in 2013, 2012 and 2011 was $22 million, $27 million and $7 million, respectively. The fair value of the restricted stock awards was primarily based upon the UAL common stock price on the date of grant. These awards are accounted for as equity awards. The fair value of the RSUs was based on the UAL common stock price as of the last day preceding the settlement date. These awards were accounted for as liability awards. Restricted stock vesting and the recognition of the expense is similar to the stock option vesting described below.

Stock Options. UAL has not granted any stock options since 2010. Historically, stock options were awarded with exercise prices equal to the fair market value of UAL’s common stock on the date of grant. UAL stock options generally vest over a period of either three or four years and have a contractual life of 10 years. The Continental stock options assumed by UAL at the Merger generally have an original contractual life of five years (management level employee options) or 10 years (outside directors). Expense related to each portion of an option grant is recognized on a straight-line basis over the specific vesting period for those options.

The table below summarizes UAL stock option activity for the years ended December 31 (in millions, except as noted):


	Options		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (in years)		Aggregate Intrinsic Value
Outstanding at December 31, 2010		11	$	21.70
Exercised		(2)		10.77			$	33
Surrendered		(2)		29.07

Outstanding at December 31, 2011		7		23.80
Exercised		(1)		12.42				14
Surrendered		(1)		30.50

Outstanding at December 31, 2012		5		25.60
Exercised		(2)		16.28				27
Surrendered		—		27.49

Outstanding at December 31, 2013		3		31.63		2.2		18

Exercisable at December 31, 2013		3		32.00		2.2		16

The fair value of options is determined at the grant date, and at the Merger date in the case of Continental options, using a Black Scholes option pricing model, which requires the Company to make several assumptions. The risk-free interest rate is based on the U.S. treasury yield curve in effect for the expected term of the option at the time of grant. The dividend yield on UAL’s common stock was assumed to be zero since UAL did not have any plans to pay dividends at the time of the option grants.

The volatility assumptions were based upon historical volatilities of UAL and other comparable airlines whose shares are traded using daily stock price returns equivalent to the contractual term of the option. In addition, implied volatility data for both UAL and other comparable airlines, using current exchange-traded options, was utilized.

The expected lives of the options were determined based upon either a simplified assumption that the option will be exercised evenly from vesting to expiration or estimated using historical experience for the assumed options. The terms of certain awards do not provide for the acceleration of vesting upon retirement. In addition, certain awards and the assumed options awarded to employees that are retirement eligible either at the grant date or within the vesting period are considered vested at the respective retirement eligibility date.

Accumulated Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2013

Accumulated Other Comprehensive Income (Loss)

NOTE 6 - ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The tables below present the components of the Company’s accumulated other comprehensive income (loss) (“AOCI”), net of tax (in millions):


UAL (a)	Pension and Other Postretirement Unrecognized Actuarial Gains (Losses) and Prior Service Cost			Unrealized Gains (Losses) on Derivatives		Other		Total
Balance at December 31, 2010	$	152		$	240	$	(5)	$	387

Other comprehensive loss before reclassifications		(440)			163		—		(277)
Amounts reclassified from accumulated other comprehensive income		(24)			(503)		—		(527)

Net current-period other comprehensive income (loss)		(464)			(340)		—		(804)

Balance at December 31, 2011	$	(312)		$	(100)	$	(5)	$	(417)

Other comprehensive loss before reclassifications		(747)			(51)		11		(787)
Amounts reclassified from accumulated other comprehensive income		17			141		—		158

Net current-period other comprehensive income (loss)		(730)			90		11		(629)

Balance at December 31, 2012	$	(1,042)		$	(10)	$	6	$	(1,046)

Other comprehensive income before reclassifications		1,584	(b)		39		7		1,630
Amounts reclassified from accumulated other comprehensive income		42			(18)		—		24

Net current-period other comprehensive income (loss)		1,626			21		7		1,654

Balance at December 31, 2013	$	584		$	11	$	13	$	608


Details about AOCI Components	Amount Reclassified from AOCI to Income						Affected Line Item in the Statement Where Net Income is Presented
	Year Ended December 31,
	2013		2012		2011
Derivatives designated as cash flow hedges
Fuel contracts-reclassifications of (gains) losses into earnings (c)	$	(18)	$	141	$	(503)	Aircraft fuel
Amortization of pension and post-retirement items
Amortization of unrecognized (gains) losses and prior service cost and the effect of curtailments and settlements (c) (d)	$	42	$	17	$	(24)	Salaries and related costs

(a) UAL and United amounts are substantially the same except for an additional $6 million of income tax benefit at United in 2013. In addition, United had additional (losses) gains related to investments and other of $(2) million, $1 million and $1 million in 2011, 2012 and 2013, respectively.

(b) For 2013, prior service credits increased by $331 million and actuarial gains increased by approximately $1.3 billion. Amounts for 2012 and 2011 were not material.

(c)	Income tax expense offset by Company’s valuation allowance.

(d) This accumulated other comprehensive income component is included in the computation of net periodic pension costs (see Note 8 of this report for additional details).

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Topic 220
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Glossary Reclassification Adjustments
-URI http://asc.fasb.org/extlink&oid=6522872

Pension and Other Postretirement Plans

Income Taxes

12 Months Ended

Dec. 31, 2013

Income Taxes

NOTE 7 - INCOME TAXES

The significant components of the income tax expense (benefit) are as follows (in millions):


2013	UAL		United
Current	$	(18)	$	(18)
Deferred		(14)		1

	$	(32)	$	(17)


2012
Current	$	(14)	$	(9)
Deferred		13		13

	$	(1)	$	4



2011
Current	$	11	$	3
Deferred		(6)		(5)

	$	5	$	(2)

The income tax provision differed from amounts computed at the statutory federal income tax rate, as follows (in millions):


Year ended December 31, 2013	UAL		United
Income tax provision at statutory rate	$	189	$	223
State income taxes, net of federal income tax		5		5
Foreign income taxes		3		3
Nondeductible employee meals		15		15
Nondeductible interest expense		—		—
Derivative market adjustment		—		(24)
Nondeductible compensation		3		3
State rate change		(33)		(33)
Valuation allowance		(219)		(229)
Other, net		5		20

	$	(32)	$	(17)

Year ended December 31, 2012
Income tax provision at statutory rate	$	(253)	$	(230)
State income taxes, net of federal income tax		(15)		(7)
Foreign income taxes		7		7
Nondeductible employee meals		12		12
Nondeductible interest expense		19		19
Derivative market adjustment		—		(15)
Nondeductible compensation		5		5
Valuation allowance		234		223
Other, net		(10)		(10)

	$	(1)	$	4

Year Ended December 31, 2011
Income tax provision at statutory rate	$	298	$	299
State income taxes, net of federal income tax		(19)		(17)
Nondeductible acquisition costs		(17)		(17)
Nondeductible employee meals		12		12
Nondeductible interest expense		13		13
Derivative market adjustment		—		10
Nondeductible compensation		9		10
Valuation allowance		(294)		(315)
Other, net		3		3

	$	5	$	(2)

State tax benefit recorded in 2011 resulted from certain adjustments to existing state tax net operating losses, and such benefit was fully offset by an increase in the valuation allowance.

Temporary differences and carryforwards that give rise to deferred tax assets and liabilities at December 31, 2013 and 2012 were as follows (in millions):


	UAL				United
	December 31,				December 31,
	2013		2012		2013		2012
Deferred income tax asset (liability):
Federal and state net operating loss (“NOL”) carryforwards	$	3,221	$	3,025	$	3,158	$	2,957
Frequent flyer deferred revenue		2,254		2,425		2,254		2,426
Employee benefits, including pension, postretirement, medical and the Pension Benefit Guaranty Corporation (“PBGC”) notes		1,701		2,488		1,701		2,491
Lease fair value adjustment		123		259		123		259
AMT credit carryforwards		233		251		233		251
Other assets		217		947		217		882
Less: Valuation allowance		(3,806)		(4,603)		(3,776)		(4,503)

Total deferred tax assets (a)	$	3,943	$	4,792	$	3,910	$	4,763


Depreciation, capitalized interest and other	$	(3,201)	$	(3,705)	$	(3,201)	$	(3,702)
Intangibles		(1,585)		(1,578)		(1,585)		(1,579)
Other liabilities		(144)		(509)		(111)		(406)

Total deferred tax liabilities	$	(4,930)	$	(5,792)	$	(4,897)	$	(5,687)

Net deferred tax liability (a)	$	(987)	$	(1,000)	$	(987)	$	(924)

(a) During 2013, UAL identified adjustments to the components of the deferred taxes. As a result of this analysis, changes in deferred tax assets and liabilities occurred, and are reflected in 2013 deferred tax balances. UAL and United increased their valuation allowance to reflect these adjustments by $84 million and $163 million, respectively. United separately identified an adjustment of $68 million to increase its deferred tax liability with an offset to United-only equity to correct an error made in prior years. This item did not affect the consolidated accounts of UAL. It was corrected in the current period as it was not considered material to United’s prior year reported financial position.

United and its domestic consolidated subsidiaries file a consolidated federal income tax return with UAL. Under an intercompany tax allocation policy, United and its subsidiaries compute, record and pay UAL for their own tax liability as if they were separate companies filing separate returns. In determining their own tax liabilities, United and each of its subsidiaries take into account all tax credits or benefits generated and utilized as separate companies and they are each compensated for the aforementioned tax benefits only if they would be able to use those benefits on a separate company basis.

In addition to the deferred tax assets listed in the table above, UAL has an $800 million unrecorded tax benefit at December 31, 2013, primarily attributable to the difference between the amount of the financial statement expense and the allowable tax deduction for UAL’s common stock issued to certain unsecured creditors and employees pursuant to UAL Corporation’s Chapter 11 bankruptcy protection. This unrecorded tax benefit is accounted for by analogy to Accounting Standards Codification Topic 718 which requires recognition of the tax benefit to be deferred until it is realized as a reduction of taxes payable. Although not recognized for financial reporting purposes, this unrecognized tax benefit is available to reduce future income and is incorporated into the disclosed amounts of our federal and state NOL carryforwards, which are discussed below.

The federal and state NOL carryforwards relate to prior years’ NOLs, which may be used to reduce tax liabilities in future years. These tax benefits are mostly attributable to federal pre-tax NOL carryforwards of $10.9 billion for UAL (including the NOLs discussed in the preceding paragraph). If not utilized these federal pre-tax NOLs will expire as follows (in billions): $1.4 in 2022, $1.9 in 2023, $2.4 in 2024, $2.0 in 2025 and $3.2 after 2025. In addition, the majority of state tax benefits of the net operating losses of $168 million for UAL expires over a five to 20-year period.

Both UAL Corporation and Continental experienced an “ownership change” as defined under Section 382 of the Internal Revenue Code of 1986, as amended, as a result of the Merger. However, the Company does not expect these ownership changes to significantly limit its ability to use its NOL and alternative minimum tax (“AMT”) credit carryforwards in the carryforward period because the size of the limitation exceeds our NOL and AMT credit carryforwards.

The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income (including the reversals of deferred tax liabilities) during the periods in which those deferred tax assets will become deductible. The Company’s management assesses available positive and negative evidence regarding the realizability of its deferred tax assets and records a valuation allowance when it is more likely than not that deferred tax assets will not be realized. To form a conclusion, management considers positive evidence in the form of reversing temporary differences, projections of future taxable income and tax planning strategies, and negative evidence such as current period and cumulative losses. Although the Company was not in a three-year cumulative loss position at the end of 2013, management determined that the loss in 2012, the overall modest level of cumulative pretax income in the three years ended December 31, 2013 of 0.6% of total revenues in that period and the uncertainty associated with projecting future taxable income supported the conclusion that the valuation allowance was still necessary. Management will continue to evaluate future financial performance to determine whether such performance is both sustained and significant enough to provide sufficient evidence to support reversal of the valuation allowance.

The December 31, 2013 valuation allowances of $3.8 billion for both UAL and United, if reversed in future years will reduce income tax expense. The current valuation allowance reflects decreases from December 31, 2012 of $797 million and $727 million for UAL and United, respectively, including amounts charged directly to other comprehensive income.

The Company’s unrecognized tax benefits related to uncertain tax positions were $14 million, $19 million and $24 million at 2013, 2012 and 2011, respectively. Included in the ending balance at 2013 is $12 million that would affect the Company’s effective tax rate if recognized. The Company does not expect significant increases or decreases in their unrecognized tax benefits within the next twelve months.

There are no significant amounts included in the balance at December 31, 2013 for tax positions for which the ultimate deductibility is highly certain but for which there is uncertainty about the timing of such deductibility.

The Company records penalties and interest relating to uncertain tax positions in Other operating expense and Interest expense, respectively, in its consolidated statements of operations. The Company has not recorded any significant expense or liabilities related to interest or penalties in its consolidated financial statements.

The following is a reconciliation of the beginning and ending amount of unrecognized tax benefits related to the Company’s uncertain tax positions (in millions):


	2013		2012		2011
Balance at January 1,	$	19	$	24	$	32
Decrease in unrecognized tax benefits relating to settlements with taxing authorities		—		(12)		—
Increase (decrease) in unrecognized tax benefits as a result of tax positions taken during a prior period		—		8		(9)
Decrease in unrecognized tax benefits relating from a lapse of the statute of limitations		(5)		(1)		—
Increase in unrecognized tax benefits as a result of tax positions taken during the current period		—		—		1

Balance at December 31,	$	14	$	19	$	24

The Company’s federal income tax returns for tax years after 2002 remain subject to examination by the Internal Revenue Service (“IRS”) and state taxing jurisdictions. Continental’s federal income tax returns for tax years after 2001 remain subject to examination by the IRS and state taxing jurisdictions. In 2013, the IRS concluded an audit of 2010 through 2011 for UAL without any material adjustments to the financial statements.

Pension and Other Postretirement Plans

12 Months Ended

Dec. 31, 2013

NOTE 8 - PENSION AND OTHER POSTRETIREMENT PLANS

The following summarizes the significant pension and other postretirement plans of United:

Pension Plans

United maintains two primary defined benefit pension plans, one covering certain pilot employees and another covering certain U.S. non-pilot employees. Each of these plans provide benefits based on a combination of years of benefit accruals service and an employee’s final average compensation. Additional benefit accruals were frozen under the plan covering certain pilot employees during 2005 and management and administrative employees as of December 31, 2013 at which time any existing accrued benefits for those employees were preserved. Benefit accruals for certain non-pilot employees under its other primary defined benefit pension plan continue. United maintains additional defined benefit pension plans, which cover certain international employees.

Other Postretirement Plans

We maintain postretirement medical programs which provide medical benefits to certain retirees and eligible dependents, as well as life insurance benefits to certain retirees participating in the plan. Benefits provided are subject to applicable contributions, co-payments, deductible and other limits as described in the specific plan documentation.

During 2013, the Company experienced significant changes in its benefit obligations related to its primary defined benefit pension plans and postretirement medical programs. The significant changes resulted from the reduction or elimination of benefits for certain work groups including elimination of the postretirement medical benefits for all management and administrative employees and only those International Association of Machinists (“IAM”) employees with less than 20 years of service. Additionally, future accruals for defined benefit pension benefits for management and administrative employees were eliminated effective December 31, 2013. All of these changes are reflected in the December 31, 2013 obligation. In addition, certain key actuarial changes resulted in an additional net reduction of the pension and postretirement medical benefit obligations, principally market increases in discount rates, changes in participation and retirement rates for retiree medical plans (driven primarily by the actual experience in pilot retirement rates resulting from a change of the mandatory pilot retirement age to 65), partially offset by increases in anticipated salary scale for the pension plan, and an increase in health care trend rates for postretirement medical plans.

Changes in benefits that either qualified as curtailments (which reduced prior actuarial losses) or negative plan amendments are detailed in the tables below. Actuarial assumption changes are reflected as a component of the net actuarial gains/(losses) during 2013. These amounts will be amortized over the average remaining service life of the covered active employees or the average life expectancy of inactive participants and will reduce 2013 pension and retiree medical expense as described below.

The following table sets forth the reconciliation of the beginning and ending balances of the benefit obligation and plan assets, the funded status and the amounts recognized in these financial statements for the defined benefit and other postretirement plans (in millions):


	Pension Benefits
	Year Ended December 31, 2013		Year Ended December 31, 2012
Accumulated benefit obligation:	$	3,383	$	3,978


Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	4,526	$	3,708
Service cost		121		99
Interest cost		191		184
Actuarial (gain) loss		(464)		702
Gross benefits paid and settlements		(269)		(162)
Curtailments		(84)		—
Other		(21)		(5)

Projected benefit obligation at end of year	$	4,000	$	4,526


Change in plan assets:
Fair value of plan assets at beginning of year	$	2,157	$	1,868
Actual gain on plan assets		239		223
Employer contributions		277		228
Gross benefits paid and settlements		(269)		(162)
Other		(7)		—

Fair value of plan assets at end of year	$	2,397	$	2,157

Funded status—Net amount recognized	$	(1,603)	$	(2,369)


	Pension Benefits
	December 31, 2013		December 31, 2012
Amounts recognized in the consolidated balance sheets consist of:
Noncurrent asset	$	49	$	35
Current liability		(2)		(4)
Noncurrent liability		(1,650)		(2,400)

Total liability	$	(1,603)	$	(2,369)

Amounts recognized in accumulated other comprehensive income (loss) consist of:
Net actuarial loss	$	(162)	$	(826)
Prior service credit		—		2

Total accumulated other comprehensive loss	$	(162)	$	(824)


	Other Postretirement Benefits
	Year Ended December 31, 2013		Year Ended December 31, 2012
Change in benefit obligation:
Benefit obligation at beginning of year	$	2,743	$	2,541
Service cost		52		50
Interest cost		110		124
Plan participants’ contributions		67		77
Actuarial (gain) loss		(640)		110
Federal subsidy		7		13
Plan amendments		(331)		22
Curtailments		8		—
Gross benefits paid		(197)		(194)

Benefit obligation at end of year	$	1,819	$	2,743

Change in plan assets:
Fair value of plan assets at beginning of year	$	58	$	58
Actual return on plan assets		1		1
Employer contributions		128		116
Plan participants’ contributions		67		77
Benefits paid		(197)		(194)

Fair value of plan assets at end of year		57		58

Funded status—Net amount recognized	$	(1,762)	$	(2,685)


	Other Postretirement Benefits
	December 31, 2013		December 31, 2012
Amounts recognized in the consolidated balance sheets consist of:
Current liability	$	(59)	$	(71)
Noncurrent liability		(1,703)		(2,614)

Total liability	$	(1,762)	$	(2,685)

Amounts recognized in accumulated other comprehensive income (loss) consist of:
Net actuarial gain (loss)	$	555	$	(79)
Prior service credit (cost)		306		(24)

Total accumulated other comprehensive income (loss)	$	861	$	(103)

The following information relates to all pension plans with an accumulated benefit obligation and a projected benefit obligation in excess of plan assets at December 31 (in millions):


	2013		2012
Projected benefit obligation	$	3,820	$	4,387
Accumulated benefit obligation		3,245		3,869
Fair value of plan assets		2,176		1,991

Net periodic benefit cost for the years ended December 31 included the following components (in millions):


	2013				2012				2011
	Pension Benefits		Other Postretirement Benefits		Pension Benefits		Other Postretirement Benefits		Pension Benefits		Other Postretirement Benefits
Service cost	$	121	$	52	$	99	$	50	$	88	$	47
Interest cost		191		110		184		124		178		127
Expected return on plan assets		(163)		(2)		(138)		(2)		(140)		(2)
Curtailment loss		2		2		—		—		—		—
Amortization of prior service credits		—		(3)		(1)		—		(2)		—
Settlement (gain) loss		(10)		—		1		—		1		—
Amortization of unrecognized actuarial (gain) loss		48		3		21		(3)		(20)		(2)

Net periodic benefit cost	$	189	$	162	$	166	$	169	$	105	$	170

The estimated amounts that will be amortized in 2014 for actuarial (gains) losses are as follows (in millions):


	Pension Benefits		Other Postretirement Benefits
Actuarial (gain) loss to be reclassified from accumulated other comprehensive income into net periodic benefit cost	$	9	$	(46)

The assumptions used for the benefit plans were as follows:


	Pension Benefits
Assumptions used to determine benefit obligations	2013	2012
Discount rate	5.09%	4.19%
Rate of compensation increase	3.49%	2.49%

Assumptions used to determine net expense
Discount rate	4.48%	5.02%
Expected return on plan assets	7.56%	7.54%
Rate of compensation increase	2.48%	2.48%


	Other Postretirement Benefits
Assumptions used to determine benefit obligations	2013		2012
Discount rate		4.94%		4.12%

Assumptions used to determine net expense
Discount rate		4.12%		4.92%
Expected return on plan assets		4.00%		4.00%
Health care cost trend rate assumed for next year		7.25%		6.75%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate in 2020)		5.00%		5.00%

The Company selected the 2013 discount rate for each of its plans by using a hypothetical portfolio of high quality bonds at December 31, 2013, that would provide the necessary cash flows to match projected benefit payments.

We develop our expected long-term rate of return assumption for such plans based on historical experience and by evaluating input from the trustee managing the plans’ assets. Our expected long-term rate of return on plan assets for these plans is based on a target allocation of assets, which is based on our goal of earning the highest rate of return while maintaining risk at acceptable levels. The plans strive to have assets sufficiently diversified so that adverse or unexpected results from one security class will not have an unduly detrimental impact on the entire portfolio. Plan fiduciaries regularly review our actual asset allocation and the pension plans’ investments are periodically rebalanced to our targeted allocation when considered appropriate. United’s plan assets are allocated within the following guidelines:


	Percent of Total	Expected Long-Term Rate of Return

Equity securities	42-52 %	9.5 %
Fixed-income securities	26-34	5.5
Alternatives	15-21	7.5
Other	3-7	4.5

One-hundred percent of other postretirement plan assets are invested in a deposit administration fund.

Assumed health care cost trend rates have a significant effect on the amounts reported for the other postretirement plans. A 1% change in the assumed health care trend rate for the Company would have the following additional effects (in millions):


	1% Increase		1% Decrease
Effect on total service and interest cost for the year ended December 31, 2013	$	21	$	(17)
Effect on postretirement benefit obligation at December 31, 2013		213		(186)

A one percentage point decrease in the weighted average discount rate would increase the postretirement benefit liability by approximately $203 million and increase the estimated 2013 benefits expense by approximately $10 million.

Fair Value Information. Accounting standards require us to use valuation techniques to measure fair value that maximize the use of observable inputs and minimize the use of unobservable inputs. These inputs are prioritized as follows:


Level 1		Unadjusted quoted prices in active markets for assets or liabilities identical to those to be reported at fair value
Level 2		Other inputs that are observable directly or indirectly, such as quoted prices for similar assets or liabilities or market-corroborated inputs
Level 3		Unobservable inputs for which there is little or no market data and which require us to develop our own assumptions about how market participants would price the assets or liabilities

The following tables present information about the United’s pension and other postretirement plan assets at December 31 (in millions):


	2013								2012
Pension Plan Assets:	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Equity securities funds	$	1,158	$	389	$	769	$	—	$	1,034	$	383	$	651	$	—
Fixed-income securities		702		—		698		4		611		—		609		2
Alternatives		405		—		199		206		394		—		234		160
Insurance contract		26		—		—		26		36		—		—		36
Other investments		106		—		106		—		82		—		82		—

Total	$	2,397	$	389	$	1,772	$	236	$	2,157	$	383	$	1,576	$	198

Other Postretirement Benefit Plan Assets:
Deposit administration fund	$	57	$	—	$	—	$	57	$	58	$	—	$	—	$	58

Equity and Fixed-Income Securities. Equity securities include investments in both developed market and emerging market equity securities. Fixed-income securities include primarily U.S. and non-U.S. government fixed-income securities and U.S. and non-U.S corporate fixed-income securities along with asset-backed securities.

Insurance Contract and Deposit Administration Fund. Each of these investments are stable value investment products structured to provide investment income.

Alternatives. Alternative investments consist primarily of investments in hedge funds, real estate and private equity interests.

Other investments. Other investments consist primarily of investments in currency and commodity commingled funds.

The reconciliation of United’s defined benefit plan assets measured at fair value using unobservable inputs (Level 3) for the years ended December 31, 2013 and 2012 is as follows (in millions):


	2013		2012
Balance at beginning of year	$	256	$	249
Actual return on plan assets:
Sold during the year		15		—
Held at year end		7		(47)
Purchases, sales, issuances and settlements (net)		15		54

Balance at end of year	$	293	$	256

Funding requirements for tax-qualified defined benefit pension plans are determined by government regulations. United’s contributions reflected above have satisfied its required contributions through the 2013 calendar year. Expected 2014 employer contributions to all of United’s pension and postretirement plans are $288 million and $120 million, respectively.

The estimated future benefit payments, net of expected participant contributions, in United’s pension plans and other postretirement benefit plans as of December 31, 2013 are as follows (in millions):


	Pension		Other Postretirement		Other Postretirement— subsidy receipts
2014	$	247	$	122	$	6
2015		259		123		7
2016		265		126		7
2017		271		129		8
2018		268		132		9
Years 2019 – 2023		1,435		717		53

Defined Contribution Plans

Depending upon the employee group, employer contributions consist of matching contributions and/or non-elective employer contributions. United’s employer contribution percentages vary from 1% to 16% of eligible earnings depending on the terms of each plan. United recorded contributions to its defined contribution plans of $433 million, $330 million and $291 million in the years ended December 31, 2013, 2012 and 2011, respectively.

Multi-Employer Plans

United’s participation in the IAM National Pension Plan (“IAM Plan”) for the annual period ended December 31, 2013 is outlined in the table below. There have been no significant changes that affect the comparability of 2013 and 2012 contributions. The risks of participating in these multi-employer plans are different from single-employer plans, as United may be subject to additional risks that others do not meet their obligations, which in certain circumstances could revert to United. The IAM Plan reported $351 million in employers’ contributions for the year ended December 31, 2012. For 2012, the Company’s contributions to the IAM Plan represented more than 5% of total contributions to the IAM Plan.


Pension Fund		IAM National Pension Fund
EIN/ Pension Plan Number		51-6031295 - 002
Pension Protection Act Zone Status (2013 and 2012)*		Green Zone
FIP/RP Status Pending/Implemented		No
United’s Contributions		$38 million, $36 million and $34 million in the years ended December 31, 2013, 2012 and 2011, respectively
Surcharge Imposed		No
Expiration Date of Collective Bargaining Agreement		N/A

* Plans in the green zone are at least 80 percent funded.

At the date the financial statements were issued, Forms 5500 were not available for the plan year ending in 2013.

Profit Sharing

Substantially all employees participated in profit sharing plans, which depending on the workgroup, pay from 5% to 20%, of total pre-tax earnings, excluding special items and share-based compensation expense, to eligible employees when pre-tax profit, excluding special items, profit sharing expense and share-based compensation program expense, exceeds $10 million. Eligible U.S. co-workers in each participating work group received a profit sharing payout using a formula based on the ratio of each qualified co-worker’s annual eligible earnings to the eligible earnings of all qualified co-workers in all domestic workgroups. The international profit sharing plan paid eligible non-U.S. co-workers the same percentage of eligible pay that is calculated under the U.S. profit sharing plan for management and administrative employees. Profit sharing expense is recorded as a component of salaries and related costs in the consolidated statements of operations.

The Company recorded profit sharing and related payroll tax expense of $190 million, $119 million and $265 million in 2013, 2012 and 2011, respectively. Profit sharing expense is recorded as a component of salaries and related costs in the consolidated statements of operations.

Fair Value Measurements

12 Months Ended

Dec. 31, 2013

Fair Value Measurements

NOTE 9 - FAIR VALUE MEASUREMENTS


Level 1		Unadjusted quoted prices in active markets for assets or liabilities identical to those to be reported at fair value
Level 2		Other inputs that are observable directly or indirectly, such as quoted prices for similar assets or liabilities or market-corroborated inputs
Level 3		Unobservable inputs for which there is little or no market data and which require us to develop our own assumptions about how market participants would price the assets or liabilities

The table below presents disclosures about the fair value of financial assets and financial liabilities measured at fair value on a recurring basis in the Company’s financial statements as of December 31 (in millions):


	2013								2012
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
	UAL
Cash and cash equivalents	$	3,220	$	3,220	$	—	$	—	$	4,770	$	4,770	$	—	$	—
Short-term investments:
Asset-backed securities		694		—		694		—		715		—		715		—
Corporate debt		685		—		685		—		537		—		537		—
Certificates of deposit placed through an account registry service (“CDARS”)		301		—		301		—		367		—		367		—
Auction rate securities		105		—		—		105		116		—		—		116
U.S. government and agency notes		38		—		38		—		12		—		12		—
Other fixed income securities		78		—		78		—		26		—		26		—
Enhanced equipment trust certificates (“EETC”)		61		—		—		61		63		—		—		63
Fuel derivatives, net		104		—		104		—		46		—		46		—
Foreign currency derivatives		1		—		1		—		—		—		—		—
Restricted cash		395		395		—		—		447		447		—		—

	United
Cash and cash equivalents	$	3,214	$	3,214	$	—	$	—	$	4,765	$	4,765	$	—	$	—
Short-term investments:
Asset-backed securities		694		—		694		—		715		—		715		—
Corporate debt		685		—		685		—		537		—		537		—
CDARS		301		—		301		—		367		—		367		—
Auction rate securities		105		—		—		105		116		—		—		116
U.S. government and agency notes		38		—		38		—		12		—		12		—
Other fixed income securities		78		—		78		—		26		—		26		—
EETC		61		—		—		61		63		—		—		63
Fuel derivatives, net		104		—		104		—		46		—		46		—
Foreign currency derivatives		1		—		1		—		—		—		—		—
Restricted cash		395		395		—		—		447		447		—		—
Convertible debt derivative asset		480		—		—		480		268		—		—		268
Convertible debt option liability		(270)		—		—		(270)		(128)		—		—		(128)

Available-for-sale investment maturities - The short-term investments and EETC securities shown in the table above are classified as available-for-sale. As of December 31, 2013, asset-backed securities have remaining maturities of less than one year to approximately 41 years, corporate debt securities have remaining maturities of less than one year to approximately 22 years, CDARS have maturities of less than one year, and auction rate securities have remaining maturities of approximately 19 to 33 years. U.S. government and other securities have maturities of less than one year to approximately five years. The EETC securities have various maturities with the final maturity in 2019.

The tables below present disclosures about the activity for “Level 3” financial assets and financial liabilities for the year ended December 31 (in millions):


	2013								2012
	UAL and United				United				UAL and United				United
	Student Loan-Related Auction Rate Securities		EETC		Convertible Debt Supplemental Derivative Asset		Convertible Debt Conversion Option Liability		Student Loan-Related Auction Rate Securities		EETC		Convertible Debt Supplemental Derivative Asset		Convertible Debt Conversion Option Liability

Balance at January 1	$	116	$	63	$	268	$	(128)	$	113	$	60	$	193	$	(95)
Purchases, (sales), issuances and settlements (net)		(19)		(4)		—		—		—		(5)		—		—
Gains and (losses):
Reported in earnings:
Realized		3		—		—		—		—		—		—		—
Unrealized		1		—		212		(142)		1		—		75		(33)
Reported in other comprehensive income (loss)		4		2		—		—		2		8		—		—

Balance at December 31	$	105	$	61	$	480	$	(270)	$	116	$	63	$	268	$	(128)

United’s debt-related derivatives presented in the tables above relate to (a) supplemental indenture agreements that provide that United’s convertible debt is convertible into shares of UAL common stock upon the terms and conditions specified in the indentures, and (b) the embedded conversion options in United’s convertible debt that are required to be separated and accounted for as though they are free-standing derivatives as a result of the United debt becoming convertible into the common stock of a different reporting entity. The derivatives described above relate to the 6% Convertible Junior Subordinated Debentures due 2030 (the “6% Convertible Debentures”) and the 4.5% Convertible Notes due 2015 (the “4.5% Convertible Notes”). These derivatives are reported in United’s separate financial statements and eliminated in consolidation for UAL.

Derivative instruments and investments presented in the tables above have the same fair value as their carrying value. The table below presents the carrying values and estimated fair values of financial instruments not presented in the tables above for the years ended December 31 (in millions):


	Fair Value of Debt by Fair Value Hierarchy Level
	2013										2012
	Carrying Amount		Fair Value								Carrying Amount		Fair Value
			Total		Level 1		Level 2		Level 3				Total		Level 1		Level 2		Level 3
UAL debt	$	11,539	$	12,695	$	—	$	8,829	$	3,866	$	12,252	$	13,419	$	—	$	8,045	$	5,374
United debt		11,388		12,249		—		8,383		3,866		11,850		12,460		—		7,086		5,374


Quantitative Information About Level 3 Fair Value Measurements as of December 31, 2013 ($ in millions)
Item	Fair Value at December 31, 2013			Valuation Technique	Unobservable Input	Range (Weighted Average)
Auction rate securities	$	105		Valuation Service / Broker Quotes	Broker quotes (a)	NA
EETC		61		Discounted Cash Flows	Structure credit risk (b)	4% - 5% (4%)
Convertible debt derivative asset		480		Binomial Lattice Model	Expected volatility (c) Own credit risk (d)	45% - 60% (46%) (5%)
Convertible debt option liability		(270	)	Binomial Lattice Model	Expected volatility (c) Own credit risk (d)	45% - 60% (47%) (5%)

(a) Broker quotes obtained by a third-party valuation service.

(b) Represents the credit risk premium of the EETC structure above the risk-free rate that the Company has determined market participants would use in pricing the instruments.

(c) Represents the range in volatility estimates that the Company has determined market participants would use when pricing the instruments.

(d) Represents the range of Company-specific risk adjustments that the Company has determined market participants would use as a model input.

Valuation Processes - Level 3 Measurements - Depending on the instrument, the Company utilizes broker quotes obtained from third-party valuation services, discounted cash flow methods, or option pricing methods, as indicated above. Valuations using discounted cash flow methods are generally conducted by the Company. Valuations using option pricing models are generally provided to the Company by third-party valuation experts. Each reporting period, the Company reviews the unobservable inputs used by third-party valuation experts for reasonableness utilizing relevant information available to the Company from other sources.

The Company used broker quotes obtained from a valuation service (in replacement of a discounted cash flows method) for valuing auction rate securities. This approach provides the best available information.

Sensitivity Analysis - Level 3 Measurements - Changes in the structure credit risk would be unlikely to cause material changes in the fair value of the EETCs.

The significant unobservable inputs used in the fair value measurement of the United convertible debt derivative assets and liabilities are the expected volatility in UAL common stock and the Company’s own credit risk. Significant increases (decreases) in expected stock volatility would result in a higher (lower) fair value measurement. Significant increases (decreases) in the Company’s own credit risk would result in a lower (higher) fair value measurement. A change in one of the inputs would not necessarily result in a directionally similar change in the other.

Fair value of the Company’s financial instruments was determined as follows:


Description		Fair Value Methodology
Cash and cash equivalents		The carrying amounts approximate fair value because of the short-term maturity of these assets.

Short-term investments and Restricted cash		Fair value is based on (a) the trading prices of the investment or similar instruments, (b) an income approach, which uses valuation techniques to convert future amounts into a single present amount based on current market expectations about those future amounts when observable trading prices are not available, (c) internally-developed models of the expected future cash flows related to the securities, or (d) broker quotes obtained by third-party valuation services.

Fuel derivatives		Derivative contracts are privately negotiated contracts and are not exchange traded. Fair value measurements are estimated with option pricing models that employ observable inputs. Inputs to the valuation models include contractual terms, market prices, yield curves, fuel price curves and measures of volatility, among others.
Foreign currency derivatives		Fair value is determined with a formula utilizing observable inputs. Significant inputs to the valuation models include contractual terms, risk-free interest rates and forward exchange rates.

Debt		Fair values were based on either market prices or the discounted amount of future cash flows using our current incremental rate of borrowing for similar liabilities.

Convertible debt derivative asset and option liability		United used a binomial lattice model to value the conversion options and the supplemental derivative assets. Significant binomial model inputs that are not objectively determinable include volatility and the Company’s credit risk component of the discount rate.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

Hedging Activities

12 Months Ended

Dec. 31, 2013

Hedging Activities

NOTE 10 - HEDGING ACTIVITIES

Fuel Derivatives

Aircraft fuel has been the Company’s single largest operating expense for the last several years. The availability and price of aircraft fuel significantly affects the Company’s operations, results of operations, financial position and liquidity. Aircraft fuel prices can fluctuate based on a multitude of factors including market expectations of supply and demand balance, inventory levels, geopolitical events, economic growth expectations, fiscal/monetary policies and financial investment flows. To protect against increases in the prices of aircraft fuel, the Company routinely hedges a portion of its future fuel requirements. As of December 31, 2013, the Company had hedged approximately 24% and 8% of its projected fuel requirements (951 million and 309 million gallons, respectively) for 2014 and 2015, respectively, with commonly used financial hedge instruments based on aircraft fuel or closely related commodities, such as diesel fuel and crude oil. The Company does not enter into derivative instruments for non-risk management purposes.

Accounting pronouncements pertaining to derivative instruments and hedging are complex with stringent requirements, including documentation of hedging strategy, statistical analysis to qualify a commodity for hedge accounting both on a historical and a prospective basis, and strict contemporaneous documentation that is required at the time each hedge is designated as a cash flow hedge. As required, the Company assesses the effectiveness of each of its individual hedges on a quarterly basis. The Company also examines the effectiveness of its entire hedging program on a quarterly basis utilizing statistical analysis. This analysis involves utilizing regression and other statistical analyses that compare changes in the price of aircraft fuel to changes in the prices of the commodities used for hedging purposes.

Upon proper qualification, the Company accounts for certain fuel derivative instruments as cash flow hedges. All derivatives designated as hedges that meet certain requirements are granted hedge accounting treatment. The types of instruments the Company utilizes that qualify for special hedge accounting treatment typically include swaps, call options, collars (which consist of a purchased call option and a sold put option) and four-way collars (a collar with a higher strike sold call option and a lower strike purchased put option). Generally, utilizing hedge accounting, all periodic changes in fair value of the derivatives designated as hedges that are considered to be effective are recorded in AOCI until the underlying fuel is consumed and recorded in fuel expense. The Company is exposed to the risk that its hedges may not be effective in offsetting changes in the cost of fuel and that its hedges may not continue to qualify for hedge accounting. Hedge ineffectiveness results when the change in the fair value of the derivative instrument exceeds the change in the value of the Company’s expected future cash outlay to purchase and consume fuel. To the extent that the periodic changes in the fair value of the derivatives are not effective, that ineffectiveness is classified as Nonoperating income (expense): Miscellaneous, net in the statements of consolidated operations.

The Company also utilizes certain derivative instruments that are economic hedges but do not qualify for hedge accounting under U.S. GAAP. As with derivatives that qualify for hedge accounting, the purpose of these economic hedges is to mitigate the adverse financial impact of potential increases in the price of fuel. Currently, the only such economic hedges in the Company’s hedging portfolio are three-way collars (a collar with a higher strike sold call option). The Company records changes in the fair value of three-way collars to Nonoperating income (expense): Miscellaneous, net in the statements of consolidated operations.

If the Company terminates a derivative prior to its contractual settlement date, then the cumulative gain or loss recognized in AOCI at the termination date remains in AOCI until the forecasted transaction occurs. In a situation where it becomes probable that a hedged forecasted transaction will not occur, any gains and/or losses that have been recorded to AOCI would be required to be immediately reclassified into earnings. All cash flows associated with purchasing and settling derivatives are classified as operating cash flows in the statements of consolidated cash flows.

The Company records each derivative instrument as a derivative asset or liability (on a gross basis) in its consolidated balance sheets, and, accordingly, records any related collateral on a gross basis. The table below presents the fair value amounts of fuel derivative assets and liabilities and the location of amounts recognized in the Company’s financial statements.

At December 31, the Company’s derivatives were reported in its consolidated balance sheets as follows (in millions):


Classification	Balance Sheet Location	2013		2012
Derivatives designated as cash flow hedges
Assets:
Fuel contracts due within one year	Receivables	$	19	$	7
Fuel contracts with maturities greater than one year	Other assets: Other, net		6		—

Total assets		$	25	$	7

Liabilities:
Fuel contracts due within one year	Current liabilities: Other	$	—	$	2

Derivatives not designated for hedge accounting
Assets:
Fuel contracts due within one year	Receivables	$	70	$	44
Fuel contracts with maturities greater than one year	Other assets: Other, net		9		—

Total assets		$	79	$	44

Liabilities:
Fuel contracts due within one year	Current liabilities: Other	$	—	$	2
Fuel contracts with maturities greater than one year	Other liabilities and deferred credits: Other		—		1

Total liabilities		$	—	$	3

Total derivatives
Assets:
Fuel contracts due within one year	Receivables	$	89	$	51
Fuel contracts with maturities greater than one year	Other assets: Other, net		15		—

Total assets		$	104	$	51

Liabilities:
Fuel contracts due within one year	Current liabilities: Other	$	—	$	4
Fuel contracts with maturities greater than one year	Other liabilities and deferred credits: Other		—		1

Total liabilities		$	—	$	5

Offsetting Assets and Liabilities

We have master trading agreements with all of our fuel hedging counterparties that allow us to net our fuel hedge derivative positions. We have elected not to net the fair value positions recorded on our consolidated balance sheets. The following table shows the potential net fair value positions had we elected to offset. The table reflects offset at the counterparty level (in millions):


	Receivables		Other assets: Other, net		Hedge Derivatives, Net
2013	$	89	$	15	$	104
2012		46		—		46

The following tables present the fuel hedge gains (losses) recognized during the periods presented and their classification in the financial statements (in millions):

Derivatives designated as cash flow hedges


	Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)				Gain (Loss) Reclassified from AOCI into Income (Fuel Expense) (Effective Portion)				Amount of Gain (Loss) Recognized in Nonoperating income (expense): Miscellaneous, net (Ineffective Portion)
	2013		2012		2013		2012		2013		2012
Fuel contracts	$	39	$	(51)	$	18	$	(141)	$	5	$	(1)

Derivatives not designated for hedge accounting


	Amount of Gain Recognized in Nonoperating income (expense): Miscellaneous, net
	2013		2012		2011
Fuel contracts	$	79	$	38	$	—

Derivative Credit Risk and Fair Value

The Company is exposed to credit losses in the event of nonperformance by counterparties to its derivative instruments. While the Company records derivative instruments on a gross basis, the Company monitors its net derivative position with each counterparty to monitor credit risk. Based on the fair value of our fuel derivative instruments, our counterparties may require us to post collateral when the price of the underlying commodity decreases, and we may require our counterparties to provide us with collateral when the price of the underlying commodity increases. The following table presents information related to the Company’s derivative credit risk as of December 31 (in millions):


	2013		2012
Net derivative assets with counterparties	$	104	$	46
Collateral held by the Company (classified as an other current liability)		—		—
Potential loss related to the failure of the Company’s counterparties to perform		104		46

The Company considers counterparty credit risk in determining its exposure and the fair value of its financial instruments, and generally monitors and limits its exposure to any single counterparty. The Company considers credit risk to have a minimal impact on fair value because cash collateral is provided by the Company’s hedging counterparties periodically based on current market exposure and the credit-worthiness of the counterparties.

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

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Advanced Purchase of Miles

Debt

12 Months Ended

Dec. 31, 2013

Debt

NOTE 11 - DEBT


(In millions)	At December 31,
	2013		2012
United:
Secured
Notes payable, fixed interest rates of 4.00% to 12.00% (weighted average rate of 6.50% as of December 31, 2013), payable through 2025	$	6,279	$	5,943
Notes payable, floating interest rates of the London Interbank Offered Rate (“LIBOR”) plus 0.20% to 5.46%, payable through 2025		1,243		1,668
Term loan, LIBOR subject to a 1% floor, plus 3%, or alternative rate based on certain market rates plus 2%, due 2019		893		—
Amended credit facility, LIBOR plus 2.0%, due 2014		—		1,201
6.75% senior secured notes due 2015		800		800
9.875% senior secured notes and 12% second lien due 2013		—		600
Unsecured
4.5% senior limited subordination convertible notes due 2021		156		156
6% notes due 2026 to 2028		652		652
6% senior notes due 2020		300		—
6% convertible junior subordinated debentures due 2030		248		248
6.375% senior notes due 2018		300		—
8% notes due 2024		400		400
4.5% convertible notes due 2015		230		230
Other		103		161

		11,604		12,059

Less: unamortized debt discount		(169)		(152)
Less: current portion of long-term debt—United		(1,368)		(1,812)

Long-term debt, net—United (a)	$	10,067	$	10,095


UAL:
6% convertible senior notes due 2029	$	104	$	345

Long-term debt, net—UAL	$	10,171	$	10,440

(a) As further described below under “Convertible Debt Securities and Derivatives,” there is a basis difference between UAL and United debt values, because we were required to apply different accounting methodologies. The United debt presented above does not agree to United’s balance sheet by the amount of this adjustment.

The table below presents the Company’s contractual principal payments at December 31, 2013 under then-outstanding long-term debt agreements in each of the next five calendar years (in millions):


	UAL		United
2014	$	1,368	$	1,368
2015		2,072		2,072
2016		1,051		1,051
2017		614		614
2018		1,135		1,135
After 2018		5,468		5,364

	$	11,708	$	11,604

As of December 31, 2013, a substantial portion of the Company’s assets, principally aircraft, spare engines, aircraft spare parts, route authorities and certain other intangible assets, were pledged under various loan and other agreements. As of December 31, 2013, UAL and United were in compliance with their respective debt covenants. Continued compliance depends on many factors, some of which are beyond the Company’s control, including the overall industry revenue environment and the level of fuel costs.

Unsecured 6.375% Senior Notes. In May 2013, UAL issued $300 million aggregate principal amount of 6.375% Senior Notes due June 1, 2018. The notes are fully and unconditionally guaranteed and recorded by United on its balance sheet as debt. The indenture for the 6.375% Senior Notes requires UAL to offer to repurchase the notes for cash if certain changes of control of UAL occur at a purchase price equal to 101% of the aggregate principal amount of notes repurchased plus accrued and unpaid interest.

Unsecured 6% Senior Notes. In November 2013, UAL issued $300 million aggregate principal amount of 6% Senior Notes due December 1, 2020. The notes are fully and unconditionally guaranteed and recorded by United on its balance sheet as debt. The indenture for the 6% Senior Notes includes the same change of control covenant as the indenture for the 6.375% Senior Notes.

6% Convertible Senior Notes. The 6% Convertible Senior Notes due 2029 (the “UAL 6% Convertible Senior Notes”) may be converted by holders into shares of UAL’s common stock at a conversion price of approximately $8.69 per share. UAL does not have the option to pay the conversion price in cash upon a noteholder’s conversion; however, UAL may redeem for cash all or part of the UAL 6% Convertible Senior Notes on or after October 15, 2014. In addition, holders of the UAL 6% Convertible Senior Notes have the right to require UAL to repurchase all or a portion of their notes on each of October 15, 2014, October 15, 2019 and October 15, 2024 or if certain changes of control of UAL occur, payable by UAL in cash, shares of UAL common stock or a combination thereof, at UAL’s option.

During 2013, UAL issued approximately 28 million shares of UAL common stock pursuant to agreements that UAL entered into with certain of its securityholders in exchange for approximately $240 million in aggregate principal amount of UAL’s outstanding 6% Convertible Senior Notes held by such securityholders. The Company retired the 6% Convertible Senior Notes acquired in the exchange. As of December 31, 2013, the outstanding balance is approximately $104 million. In February 2014, UAL issued 3,582,640 additional shares of UAL common stock pursuant to agreements that UAL entered into with certain of its securityholders of UAL’s 6% Convertible Senior Notes due 2029 in exchange for $31,126,000 in aggregate principal amount.

4.5% Senior Limited Subordination Convertible Notes. The 4.5% Senior Limited Subordination Convertible Notes due 2021 (the “4.5% Notes”) may be converted by holders into shares of UAL’s common stock at a conversion price of approximately $32.64 per share. In June 2011, UAL repurchased at par value approximately $570 million of the $726 million outstanding principal amount of its 4.5% Notes due 2021 with cash after notes were put to UAL by the noteholders. On January 10, 2014, UAL called all of the 4.5% Notes that remained outstanding for redemption on February 10, 2014. In January and February 2014, holders of substantially all of the remaining $156 million outstanding principal amount of the 4.5% Notes exercised their right to convert such notes into shares of UAL common stock at a conversion rate of 30.6419 shares of UAL common stock per $1,000 principal amount of 4.5% Notes. UAL issued approximately five million shares of UAL common stock in exchange for the 4.5% Notes.

8% Notes Due 2024. UAL redeemed at par value all $400 million aggregate principal amount of the 8% Notes due 2024 on January 17, 2014. The 8% Notes due 2024 were recorded in current liabilities as of December 31, 2013.

2013 Credit and Guaranty Agreement. On March 27, 2013, United and UAL entered into the Credit and Guaranty Agreement (the “Credit Agreement”) as the borrower and guarantor, respectively. The Credit Agreement consists of a $900 million term loan due April 1, 2019 and a $1.0 billion revolving credit facility available for drawing until April 1, 2018. As of December 31, 2013, United had its entire commitment capacity of $1.0 billion available under the revolving credit facility.

Borrowings under the Credit Agreement bear interest at a variable rate equal to LIBOR, subject to a 1% floor, plus a margin of 3.0% per annum, or another rate based on certain market interest rates, plus a margin of 2.0% per annum. The principal amount of the term loan must be repaid in consecutive quarterly installments of 0.25% of the original principal amount thereof, commencing on June 30, 2013, with any unpaid balance due on April 1, 2019. United may prepay all or a portion of the loan from time to time, at par plus accrued and unpaid interest. United pays a commitment fee equal to 0.75% per-annum on the undrawn amount available under the revolving credit facility.

The Credit Agreement requires United to repay the term loan and any other outstanding borrowings under the Credit Agreement at par plus accrued and unpaid interest if certain changes of control of UAL occur.

United Amended Credit Facility. On March 27, 2013, the Company used $900 million from the Credit Agreement, together with approximately $300 million of cash to retire the entire principal balance of a $1.2 billion term loan due 2014 that was outstanding under United’s Amended and Restated Revolving Credit, Term Loan and Guaranty Agreement, dated as of February 2, 2007 (the “Amended Credit Facility”). The Amended Credit Facility was terminated concurrently with the repayment of the term loan.

As of December 31, 2013, United had cash collateralized $61 million of letters of credit, most of which had previously been issued under the Credit Agreement. United also had $398 million of performance bonds and letters of credit relating to various real estate, customs and aircraft financing obligations at December 31, 2013. Most of the letters of credit have evergreen clauses and are expected to be renewed on an annual basis and the performance bonds have expiration dates through 2018.

EETCs. United has $6.0 billion principal amount of equipment notes outstanding issued under EETC financings included in notes payable in the table of outstanding debt above. Generally, the structure of all of these EETC financings consist of pass-through trusts created by United to issue pass-through certificates, which represent fractional undivided interests in the respective pass-through trusts and are not obligations of United. The proceeds of the issuance of the pass-through certificates are used to purchase equipment notes which are issued by United and secured by its aircraft. The payment obligations under the equipment notes are those of United. Proceeds received from the sale of pass-through certificates are initially held by a depositary in escrow for the benefit of the certificate holders until United issues equipment notes to the trust, which purchases such notes with a portion of the escrowed funds. These escrowed funds are not guaranteed by United and are not reported as debt on our consolidated balance sheet because the proceeds held by the depositary are not United’s assets.

In August 2013, December 2012 and October 2012, United created separate EETC pass-through trusts, each of which issued pass-through certificates. The proceeds of the issuance of the pass-through certificates are used to purchase equipment notes issued by United and secured by its aircraft. The Company records the debt obligation upon issuance of the equipment notes rather than upon the initial issuance of the pass-through certificates. United has received all of the proceeds from the 2012 EETCs. United expects to receive all proceeds from the August 2013 pass-through trusts by the end of 2014. Certain details of the pass-through trusts are as follows (in millions, except interest rate):


EETC Date	Class	Principal		Final expected distribution date	Stated interest rate		Total debt recorded as of December 31, 2013		Proceeds received from issuance of debt during 2013		Remaining proceeds from issuance of debt to be received in future periods
August 2013	A	$	720	August 2025		4.3%	$	153	$	153	$	567
August 2013	B		209	August 2021		5.375%		44		44		165
December 2012	C		425	April 2018		6.125%		425		147		—
October 2012	A		712	October 2024		4.0%		712		465		—
October 2012	B		132	October 2020		5.5%		132		86		—

		$	2,198				$	1,466	$	895	$	732

6.75% Notes. In August 2010, United issued $800 million aggregate principal amount of 6.75% Senior Secured Notes due 2015 (the “Senior Notes”). United may redeem all or a portion of the Senior Notes at any time on or after September 15, 2012 at specified redemption prices. If United sells certain of its assets or if it experiences specific kinds of a change in control, United will be required to offer to repurchase the notes. United’s obligations under the notes are unconditionally guaranteed by certain of its subsidiaries.

4.5% Convertible Notes. The 4.5% Convertible Notes may be converted by holders into shares of UAL common stock at a conversion price of approximately $18.93 per share. The Company does not have the option to pay the conversion price in cash; however, holders of the notes may require the Company to repurchase all or a portion of the notes for cash at par plus any accrued and unpaid interest if certain changes in control of the Company occur.

6% Convertible Junior Subordinated Debentures. Continental Airlines Finance Trust II, a Delaware statutory business trust (the “Trust”) of which United owns all the common trust securities, has outstanding five million 6% convertible preferred securities, called Term Income Deferrable Equity Securities (the “TIDES”). The TIDES have a liquidation value of $50 per preferred security and are convertible at any time at the option of the holder into shares of UAL common stock at a conversion rate of $57.14 per share of common stock (equivalent to approximately 0.875 of a share of UAL common stock for each preferred security). Distributions on the preferred securities are payable by the Trust at an annual rate of 6% of the liquidation value of $50 per preferred security.

The sole assets of the Trust are the 6% Convertible Debentures with an aggregate principal amount of $248 million as of December 31, 2012 mature on November 15, 2030. The 6% Convertible Debentures are redeemable, in whole or in part, on or after November 20, 2003 at designated redemption prices. If we redeem the 6% Convertible Debentures, the Trust must redeem the TIDES on a pro rata basis having an aggregate liquidation value equal to the aggregate principal amount of the 6% Convertible Debentures redeemed. Otherwise, the TIDES will be redeemed upon maturity of the 6% Convertible Debentures, unless previously converted.

Taking into consideration the obligations under (i) the preferred securities guarantee relating to the TIDES, (ii) the indenture relating to the 6% Convertible Debentures to pay all debt and obligations and all costs and expenses of the Trust (other than U.S. withholding taxes) and (iii) the indenture, the declaration of trust relating to the TIDES and the 6% Convertible Debentures, United has fully and unconditionally guaranteed payment of (i) the distributions on the TIDES, (ii) the amount payable upon redemption of the TIDES and (iii) the liquidation amount of the TIDES.

The Trust is a subsidiary of United, and the TIDES are mandatorily redeemable preferred securities with a liquidation value of $248 million. The Trust is a variable interest entity (“VIE”) because the Company has a limited ability to make decisions about its activities. However, the Company is not the primary beneficiary of the Trust. Therefore, the Trust and the mandatorily redeemable preferred securities issued by the Trust are not reported in the Company’s balance sheets. Instead, the Company reports its 6% convertible junior subordinated debentures held by the Trust as long-term debt and interest on these debentures is recorded as interest expense for all periods presented in the accompanying financial statements.

Convertible Debt Securities and Derivatives. Following the Merger, Continental and the trustees for the 4.5% Convertible Notes, 5% Convertible Notes due 2023 and 6% Convertible Debentures entered into supplemental indenture agreements to make United’s convertible debt, which was previously convertible into shares of Continental common stock, convertible into shares of UAL common stock. For purposes of the United separate-entity reporting, as a result of this debt, which is now United debt, becoming convertible into the stock of a non-consolidated entity, the embedded conversion options in United’s convertible debt are required to be separated and accounted for as though they are free-standing derivatives. As a result, the carrying value of United’s debt, net of current maturities, on a separate-entity reporting basis as of December 31, 2013 and December 31, 2012 was $10 billion and $10 billion, respectively, which is $47 million and $57 million, respectively, lower than the consolidated UAL carrying values on those dates.

In addition, UAL’s contractual commitment to provide common stock to satisfy United’s obligation upon conversion of the debt is an embedded call option on UAL common stock that is also required to be separated and accounted for as though it is a free-standing derivative. The fair value of the indenture derivatives on a separate-entity reporting basis as of December 31, 2013 and December 31, 2012 was an asset of $480 million and $268 million, respectively. The fair value of the embedded conversion options as of December 31, 2013 and December 31, 2012, was a liability of $270 million and $128 million, respectively. The initial contribution of the indenture derivatives to United by UAL is accounted for as additional-paid-in-capital in United’s separate-entity financial statements. Changes in fair value of both the indenture derivatives and the embedded conversion options subsequent to October 1, 2010 are recognized currently in nonoperating income (expense).

The collateral, covenants and cross default provisions of the Company’s principal debt instruments that contain such provisions are summarized in the table below:


Debt Instrument		Collateral, Covenants and Cross Default Provisions
Credit Agreement		Secured by certain of United’s international route authorities, specified take-off and landing slots at certain airports and certain other assets. The Credit Agreement requires the Company to maintain at least $3.0 billion of unrestricted liquidity at all times, which includes unrestricted cash, short-term investments and any undrawn amounts under any revolving credit facility and to maintain a minimum ratio of appraised value of collateral to the outstanding obligations under the Credit Agreement of 1.67 to 1.0 at all times. The Credit Agreement contains covenants that, among other things, restrict the ability of UAL and its restricted subsidiaries (as defined in the Credit Agreement) to incur additional indebtedness and to pay dividends on or repurchase stock. The Credit Agreement contains events of default customary for this type of financing, including a cross default and cross acceleration provision to certain other material indebtedness of the Company.
6% Notes due 2026 6% Notes due 2028		The amended and restated indenture for these notes, which are unsecured, contains covenants that, among other things, restrict the ability of the Company and its restricted subsidiaries (as defined in the indenture) to incur additional indebtedness and pay dividends on or repurchase stock. These covenants cease to be in effect when the indenture covering the 6.375% Senior Notes due 2018 is discharged. The indenture contains events of default that are customary for similar financings.
6.375% Senior Notes due 2018 6% Senior Notes due 2020		The indentures for these notes, which are unsecured, contain covenants that, among other things, restrict the ability of the Company and its restricted subsidiaries (as defined in the indenture) to incur additional indebtedness and pay dividends on or repurchase stock. The indentures contain events of default that are customary for similar financings.
6.75% Senior Notes due 2015		Secured by certain of United’s U.S.-Asia and U.S.-London Heathrow routes and related assets, all of the outstanding common stock and other assets of Air Micronesia, Inc. (“AMI”) and Continental Micronesia, Inc. (“CMI”) and substantially all of the other assets of AMI and CMI, including route authorities and related assets. The indenture for these notes includes covenants that, among other things, restrict United’s ability to sell assets, incur additional indebtedness, issue preferred stock, make investments and pay dividends on or repurchase stock. In addition, if United fails to maintain a collateral coverage ratio of 1.5 to 1.0, United must pay additional interest on the Senior Notes at the rate of 2% per annum until the collateral coverage ratio equals at least 1.5 to 1.0. The indenture for these notes also includes events of default customary for similar financings and a cross default provision if United fails to make payment when due with respect to certain obligations regarding frequent flyer miles purchased by Chase under United’s Co-Brand Agreement.

Advanced Purchase of Miles

12 Months Ended

Dec. 31, 2013

NOTE 12 - ADVANCED PURCHASE OF MILES

United previously sold frequent flyer miles to Chase which United recorded as Advanced Purchase of Miles. United has the right, but is not required, to repurchase the pre-purchased miles from Chase during the term of the agreement. The balance of pre-purchased miles is eligible to be allocated by Chase to MileagePlus members’ accounts by a maximum of $199 million in 2014, $224 million in 2015, $249 million in 2016 and the remainder in 2017. The Co-Brand Agreement contains termination penalties that may require United to make certain payments and repurchase outstanding pre-purchased miles in cases such as United’s insolvency, bankruptcy or other material breaches. The Company has recorded these amounts as advanced purchase of miles in the liabilities section of the Company’s consolidated balance sheets.

The obligations of UAL, United and Mileage Plus Holdings, LLC to Chase under the Co-Brand Agreement are joint and several. Certain of United’s obligations under the Co-Brand Agreement in an amount not more than $850 million are secured by a junior lien in all collateral pledged by United under the Credit Agreement. All of United’s obligations under the Co-Brand Agreement are secured by a junior lien in all collateral pledged by United to secure its 6.75% Senior Notes due 2015. United also provides a first priority lien to Chase on its MileagePlus assets to secure certain of its obligations under the Co-Brand Agreement and its obligations under the new combined credit card processing agreement among United, Paymentech, LLC and JPMorgan Chase.

Leases and Capacity Purchase Agreements

12 Months Ended

Dec. 31, 2013

Leases and Capacity Purchase Agreements

NOTE 13 - LEASES AND CAPACITY PURCHASE AGREEMENTS

United leases aircraft, airport passenger terminal space, aircraft hangars and related maintenance facilities, cargo terminals, other airport facilities, other commercial real estate, office and computer equipment and vehicles.

At December 31, 2013, United’s scheduled future minimum lease payments under operating leases having initial or remaining noncancelable lease terms of more than one year, aircraft leases, including aircraft rent under CPAs and capital leases (substantially all of which are for aircraft) were as follows (in millions):


	Capital Leases (a)		Facility and Other Operating Leases		Aircraft Operating Leases (b)
2014	$	206	$	1,192	$	1,601
2015		183		987		1,381
2016		168		864		1,150
2017		123		831		1,053
2018		106		710		786
After 2018		678		6,002		1,819

Minimum lease payments	$	1,464	$	10,586	$	7,790

Imputed interest		(594)

Present value of minimum lease payments		870
Current portion		(117)

Long-term obligations under capital leases	$	753

(a) As of December 31, 2013, United’s aircraft capital lease minimum payments relate to leases of 47 mainline and 38 regional aircraft as well as to leases of nonaircraft assets. Imputed interest rate ranges are 4.8% to 18.5%.

(b) The operating lease payments presented above include future payments of $103 million related to 25 nonoperating aircraft as of December 31, 2013.

Aircraft operating leases have initial terms of six to twenty-six years, with expiration dates ranging from 2014 through 2024. Under the terms of most leases, United has the right to purchase the aircraft at the end of the lease term, in some cases at fair market value, and in others, at fair market value or a percentage of cost. United has facility operating leases that extend to 2041.

United is the lessee of real property under long-term operating leases at a number of airports where we are also the guarantor of approximately $1.6 billion of underlying debt and interest thereon as of December 31, 2013. These leases are typically with municipalities or other governmental entities, which are excluded from the consolidation requirements concerning VIEs. To the extent United’s leases and related guarantees are with a separate legal entity other than a governmental entity, United is not the primary beneficiary because the lease terms are consistent with market terms at the inception of the lease and the lease does not include a residual value guarantee, fixed-price purchase option, or similar feature.

In April 2013, United executed an amendment to its Terminal C lease at Newark Liberty International Airport (“Newark Liberty”) that, among other matters, extended the term of the Terminal C lease with respect to concourses C-1 and C-2 at Newark Liberty until 2033. United also committed to invest an additional $150 million in facility upgrades at Newark Liberty to enhance the customer experience and efficiency of the operation.

In November 2013, United signed a lease amendment with the City of Los Angeles and Los Angeles World Airports (“LAWA”) to its terminal facilities lease at Los Angeles International Airport (“LAX”). The amendment allows United to make approximately $450 million in renovations at LAX over the next four years. United will fund the cost of these renovations and LAWA will acquire the improvements at the end of each designated construction phase through a cash payment at the construction cost. United expects to be considered the owner of the property during and after the construction period for accounting purposes. As a result, the construction project will be included on the Company’s balance sheet as operating property and equipment and with the construction obligation under other liabilities.

United’s nonaircraft rent expense was approximately $1.3 billion for each of the years ended December 31 2013, 2012, and 2011.

In addition to nonaircraft rent and aircraft rent, which is separately presented in the consolidated statements of operations, United had aircraft rent related to regional aircraft operating leases, which is included as part of regional capacity purchase expense in United’s consolidated statement of operations, of $428 million, $463 million and $498 million for the years ended December 31, 2013, 2012 and 2011, respectively.

In connection with UAL Corporation’s and United Air Lines, Inc.’s fresh-start reporting requirements upon their exit from Chapter 11 bankruptcy protection in 2006 and the Company’s acquisition accounting adjustments related to the Merger, lease valuation adjustments for operating leases were initially recorded in the consolidated balance sheet, representing the net present value of the differences between contractual lease rates and the fair market lease rates for similar leased assets at the time. An asset (liability) results when the contractual lease rates are more (less) favorable than market lease terms at the valuation date. The lease valuation adjustment is amortized on a straight-line basis as an increase (decrease) to rent expense over the individual applicable remaining lease terms, resulting in recognition of rent expense as if United had entered into the leases at market rates. The related remaining lease terms are one to 11 years for United. The lease valuation adjustments are classified within other noncurrent liabilities and the net accretion amounts are $173 million, $240 million and $227 million for the years ended December 31, 2013, 2012 and 2011, respectively.

Regional CPAs

United has CPAs with certain regional carriers. We purchase all of the capacity from the flights covered by the CPA at a negotiated price. We pay the regional carrier a pre-determined rate, subject to annual inflation adjustments, primarily for block hours flown (the hours from gate departure to gate arrival) and other operating factors and reimburse the regional carrier for various pass-through expenses related to the flights. Under the CPAs, we are responsible for the cost of providing fuel for all flights and for paying aircraft rent for all of the aircraft covered by the CPAs. Generally, the CPAs contain incentive bonus and rebate provisions based upon each regional carrier’s operational performance. United’s CPAs are for 572 regional aircraft, and the CPAs have terms expiring through 2027. Aircraft operated under CPAs include aircraft leased directly from the regional carriers and those leased from third-party lessors and operated by the regional carriers.

In May 2013, United entered into a CPA with SkyWest Airlines, Inc. (“SkyWest”), a wholly-owned subsidiary of SkyWest, Inc., to operate 40 Embraer S.A. (“Embraer”) EMB175 aircraft under the United Express brand. SkyWest will purchase these 76-seat aircraft with deliveries in 2014 and 2015.

In April 2013, United agreed to purchase 30 Embraer EMB175 aircraft. In August 2013, United entered into a CPA with Mesa Air Group, Inc. and Mesa Airlines, Inc. (“Mesa”), a wholly-owned subsidiary of Mesa Air Group, Inc., for Mesa to operate these 30 Embraer EMB175 aircraft under the United Express brand.

Our future commitments under our CPAs are dependent on numerous variables, and are therefore difficult to predict. The most important of these variables is the number of scheduled block hours. Although we are not required to purchase a minimum number of block hours under certain of our CPAs, we have set forth below estimates of our future payments under the CPAs based on our assumptions. United’s estimates of its future payments under all of the CPAs do not include the portion of the underlying obligation for any aircraft leased to ExpressJet or deemed to be leased from other regional carriers and facility rent that are disclosed as part of aircraft and nonaircraft operating leases. For purposes of calculating these estimates, we have assumed (1) the number of block hours flown is based on our anticipated level of flight activity or at any contractual minimum utilization levels if applicable, whichever is higher, (2) that we will reduce the fleet as rapidly as contractually allowed under each CPA, (3) that aircraft utilization, stage length and load factors will remain constant, (4) that each carrier’s operational performance will remain at historic levels and (5) that inflation is projected to be between 1.38% and 2.50% per year. These amounts exclude variable pass-through costs such as fuel and landing fees, among others. Based on these assumptions as of December 31, 2013, our future payments through the end of the terms of our CPAs are presented in the table below (in millions):


2014	$	1,936
2015		1,747
2016		1,532
2017		1,449
2018		1,340
After 2018		3,410

	$	11,414

It is important to note that the actual amounts we pay to our regional operators under CPAs could differ materially from these estimates. For example, a 10% increase or decrease in scheduled block hours for all of United’s regional operators (whether as a result of changes in average daily utilization or otherwise) in 2014 would result in a corresponding change in annual cash obligations under the CPAs of approximately $159 million (8.2%).

Variable Interest Entities

12 Months Ended

Dec. 31, 2013

Variable Interest Entities

NOTE 14 - VARIABLE INTEREST ENTITIES

Variable interests are contractual, ownership or other monetary interests in an entity that change with fluctuations in the fair value of the entity’s net assets exclusive of variable interests. A VIE can arise from items such as lease agreements, loan arrangements, guarantees or service contracts. An entity is a VIE if (a) the entity lacks sufficient equity or (b) the entity’s equity holders lack power or the obligation and right as equity holders to absorb the entity’s expected losses or to receive its expected residual returns. Therefore, if the equity owners as a group do not have the power to direct the entity’s activities that most significantly impact its economic performance, the entity is a VIE.

If an entity is determined to be a VIE, the entity must be consolidated by the primary beneficiary. The primary beneficiary is the holder of the variable interests that has the power to direct the activities of a VIE that (i) most significantly impact the VIE’s economic performance and (ii) has the obligation to absorb losses of or the right to receive benefits from the VIE that could potentially be significant to the VIE. Therefore, the Company must identify which activities most significantly impact the VIE’s economic performance and determine whether it, or another party, has the power to direct those activities.

The Company’s evaluation of its association with VIEs is described below:

Aircraft Leases. We are the lessee in a number of operating leases covering the majority of our leased aircraft. The lessors are trusts established specifically to purchase, finance and lease aircraft to us. These leasing entities meet the criteria for VIEs. We are generally not the primary beneficiary of the leasing entities if the lease terms are consistent with market terms at the inception of the lease and do not include a residual value guarantee, fixed-price purchase option or similar feature that obligates us to absorb decreases in value or entitles us to participate in increases in the value of the aircraft. This is the case for many of our operating leases; however, leases of approximately 72 mainline jet aircraft contain a fixed-price purchase option that allow United to purchase the aircraft at predetermined prices on specified dates during the lease term. Additionally, leases covering approximately 256 leased regional jet aircraft contain an option to purchase the aircraft at the end of the lease term at prices that, depending on market conditions, could be below fair value. United has not consolidated the related trusts because, even taking into consideration these purchase options, United is still not the primary beneficiary. United’s maximum exposure under these leases is the remaining lease payments, which are reflected in future lease commitments in Note 13 of this report.

EETCs. United evaluated whether the pass-through trusts formed for its EETC financings, treated as either debt or aircraft operating leases, are VIEs required to be consolidated by United under applicable accounting guidance, and determined that the pass-through trusts are VIEs. Based on United’s analysis as described below, United determined that it does not have a variable interest in the pass-through trusts.

The primary risk of the pass-through trusts is credit risk (i.e. the risk that United, the issuer of the equipment notes, may be unable to make its principal and interest payments). The primary purpose of the pass-through trust structure is to enhance the credit worthiness of United’s debt obligation through certain bankruptcy protection provisions, a liquidity facility (in certain of the EETC structures) and improved loan-to-value ratios for more senior debt classes. These credit enhancements lower United’s total borrowing cost. Pass-through trusts are established to receive principal and interest payments on the equipment notes purchased by the pass-through trusts from United and remit these proceeds to the pass-through trusts’ certificate holders.

United does not invest in or obtain a financial interest in the pass-through trusts. Rather, United has an obligation to make interest and principal payments on its equipment notes held by the pass-through trusts. United did not intend to have any voting or non-voting equity interest in the pass-through trusts or to absorb variability from the pass-through trusts. Based on this analysis, the Company determined that it is not required to consolidate the pass-through trusts.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2013

Commitments and Contingencies

NOTE 15 - COMMITMENTS AND CONTINGENCIES

Commitments. As of December 31, 2013, United had firm commitments to purchase aircraft from The Boeing Company (“Boeing”), Embraer and Airbus S.A.S. (“Airbus”) presented in the table below:


Aircraft Type	Number of Firm Commitments (a)
Airbus A350-1000		35
Boeing 737-900ER		63
Boeing 737 MAX 9		100
Boeing 787-8/-9/-10		57
Embraer EMB175		30
(a) United also has options and purchase rights for additional aircraft.

The aircraft listed in the table above are scheduled for delivery from 2014 through 2025.

The table below summarizes United’s commitments as of December 31, 2013 (including those assigned from UAL), which primarily relate to the acquisition of aircraft and related spare engines, aircraft improvements and include other commitments primarily to acquire information technology services and assets for the years ended December 31 (in billions):


2014	$	3.0
2015		2.8
2016		2.0
2017		1.5
2018		2.1
After 2018		12.5

	$	23.9

Any incremental firm aircraft orders, including through the exercise of purchase options and purchase rights, will increase the total future capital commitments of the Company.

As of December 31, 2013, United has arranged for EETC financing of 15 Boeing 737-900ER aircraft and two Boeing 787-8 aircraft, which are scheduled to be delivered from January through June 2014. In addition, United has secured backstop financing commitments from certain of its aircraft manufacturers for a limited number of its future aircraft deliveries, subject to certain customary conditions. However, the Company does not have backstop financing or any financing currently in place for its other firm aircraft orders. Financing will be necessary to satisfy the Company’s capital commitments for its firm order aircraft and other related capital expenditures. The Company can provide no assurance that any financing not already in place for aircraft and spare engine deliveries will be available to the Company on acceptable terms when necessary or at all.

Legal and Environmental. The Company has certain contingencies resulting from litigation and claims incident to the ordinary course of business. Management believes, after considering a number of factors, including (but not limited to) the information currently available, the views of legal counsel, the nature of contingencies to which the Company is subject and prior experience, that the ultimate disposition of the litigation and claims will not materially affect the Company’s consolidated financial position or results of operations. The Company records liabilities for legal and environmental claims when a loss is probable and reasonably estimable. These amounts are recorded based on the Company’s assessments of the likelihood of their eventual disposition.

Guarantees and Indemnifications. In the normal course of business, the Company enters into numerous real estate leasing and aircraft financing arrangements that have various guarantees included in the contracts. These guarantees are primarily in the form of indemnities under which the Company typically indemnifies the lessors and any tax/financing parties against tort liabilities that arise out of the use, occupancy, operation or maintenance of the leased premises or financed aircraft. Currently, the Company believes that any future payments required under these guarantees or indemnities would be immaterial, as most tort liabilities and related indemnities are covered by insurance (subject to deductibles). Additionally, certain leased premises such as fueling stations or storage facilities include indemnities of such parties for any environmental liability that may arise out of or relate to the use of the leased premises.

United is the guarantor of approximately $1.9 billion in aggregate principal amount of tax-exempt special facilities revenue bonds and interest thereon. These bonds, issued by various airport municipalities, are payable solely from rentals paid under long-term agreements with the respective governing bodies. The leasing arrangements associated with $1.6 billion of these obligations are accounted for as operating leases with the associated expense recorded on a straight-line basis resulting in ratable accrual of the lease obligation over the expected lease term. These tax-exempt special facilities revenue bonds are included in our lease commitments disclosed in Note 13 of this report. The leasing arrangements associated with $267 million of these obligations are accounted for as capital leases. All these bonds are due between 2015 and 2038.

In United’s financing transactions that include loans, United typically agrees to reimburse lenders for any reduced returns with respect to the loans due to any change in capital requirements and, in the case of loans in which the interest rate is based on LIBOR, for certain other increased costs that the lenders incur in carrying these loans as a result of any change in law, subject in most cases to obligations of the lenders to take certain limited steps to mitigate the requirement for, or the amount of, such increased costs. At December 31, 2013, the Company had $2.1 billion of floating rate debt and $286 million of fixed rate debt, with remaining terms of up to twelve years, that are subject to these increased cost provisions. In several financing transactions involving loans or leases from non-U.S. entities, with remaining terms of up to twelve years and an aggregate balance of $2.3 billion, the Company bears the risk of any change in tax laws that would subject loan or lease payments thereunder to non-U.S. entities to withholding taxes, subject to customary exclusions.

Fuel Consortia. United participates in numerous fuel consortia with other air carriers at major airports to reduce the costs of fuel distribution and storage. Interline agreements govern the rights and responsibilities of the consortia members and provide for the allocation of the overall costs to operate the consortia based on usage. The consortia (and in limited cases, the participating carriers) have entered into long-term agreements to lease certain airport fuel storage and distribution facilities that are typically financed through tax-exempt bonds (either special facilities lease revenue bonds or general airport revenue bonds), issued by various local municipalities. In general, each consortium lease agreement requires the consortium to make lease payments in amounts sufficient to pay the maturing principal and interest payments on the bonds. As of December 31, 2013, approximately $1.2 billion principal amount of such bonds were secured by significant fuel facility leases in which United participates, as to which United and each of the signatory airlines has provided indirect guarantees of the debt. As of December 31, 2013, the Company’s contingent exposure was approximately $250 million principal amount of such bonds based on its recent consortia participation. The Company’s contingent exposure could increase if the participation of other air carriers decreases. The guarantees will expire when the tax-exempt bonds are paid in full, which ranges from 2014 to 2041. The Company did not record a liability at the time these indirect guarantees were made.

Credit Card Processing Agreements. United has agreements with financial institutions that process customer credit card transactions for the sale of air travel and other services. Under certain of United’s credit card processing agreements, the financial institutions either require, or under certain circumstances have the right to require, that United maintains a reserve equal to a portion of advance ticket sales that has been processed by that financial institution, but for which United has not yet provided the air transportation. Such financial institutions may require additional cash or other collateral reserves to be established or additional withholding of payments related to receivables collected if United does not maintain certain minimum levels of unrestricted cash, cash equivalents and short term investments. United’s current level of unrestricted cash, cash equivalents and short term investments is substantially in excess of these minimum levels.

Labor Negotiations. As of December 31, 2013, United, including its subsidiaries, had approximately 87,000 employees. Approximately 80% of United’s employees were represented by various U.S. labor organizations as of December 31, 2013.

In the fourth quarter 2013, the Company announced that the fleet service, passenger service and storekeeper work groups at its United, CMI and MileagePlus subsidiaries ratified new joint labor agreements. We are in the process of negotiating amended collective bargaining agreements with our remaining employee groups without joint collective bargaining agreements, including our technicians, flight attendants and dispatchers.

Statement of Consolidated Cash Flows - Supplemental Disclosures

12 Months Ended

Dec. 31, 2013

Statement of Consolidated Cash Flows - Supplemental Disclosures

NOTE 16 - STATEMENT OF CONSOLIDATED CASH FLOWS - SUPPLEMENTAL DISCLOSURES

Supplemental disclosures of cash flow information and non-cash investing and financing activities for the years ended December 31 are as follows (in millions):


2013	UAL		United
Cash paid (refunded) during the period for:
Interest (net of amounts capitalized)	$	752	$	752
Income taxes		(20)		(15)
Non-cash transactions:
Net property and equipment acquired through issuance of debt	$	229	$	229
Airport construction financing		40		40
Exchanges of certain 6% convertible senior notes for common stock		240		—

2012
Cash paid during the period for:
Interest (net of amounts capitalized)	$	766	$	766
Income taxes		2		4
Non-cash transactions:
Net property and equipment acquired through issuance of debt	$	544	$	544
8% Contingent Senior Unsecured Notes and 6% Senior Notes, net of discount		357		357
Special facility payment financing		101		101
Airport construction financing		50		50

2011
Cash paid during the period for:
Interest (net of amounts capitalized)	$	855	$	855
Income taxes		10		2
Non-cash transactions:
Net property and equipment acquired through issuance of debt	$	130	$	130
8% Contingent Senior Unsecured Notes, net of discount		88		88
Interest paid in kind on 6% Senior Notes		37		37

Integration-Related Costs and Special Items

12 Months Ended

Dec. 31, 2013

NOTE 17 - INTEGRATION-RELATED COSTS AND SPECIAL ITEMS

Integration-related costs and special items classified as special charges in the statements of consolidated operations consisted of the following for the years ended December 31 (in millions):


	2013		2012		2011
Integration-related costs	$	205	$	739	$	517
Labor agreement costs		127		475		—
Severance and benefits		105		125		—
Asset impairments		33		30		4
Termination of maintenance service contract		—		—		58
Additional costs associated with the temporarily grounded Boeing 787 aircraft		18		—		—
(Gains) losses on sale of assets and other special charges, net		32		(46)		13

Total	$	520	$	1,323	$	592

Integration-related costs

Integration-related costs incurred during 2013 and 2012 included compensation costs related to systems integration and training, branding activities, write-off or acceleration depreciation on systems and facilities that are either no longer used or planned to be used for significantly shorter periods, as well as relocation for employees and severance primarily associated with administrative headcount reductions. In 2011, these costs also included costs to terminate certain service contracts, costs to write-off system assets, payments to third-party consultants assisting with integration planning and organization design and compensation costs related to the systems integration. In addition, the Company recorded a liability of $88 million related to the fair value of UAL’s obligation to issue to the PBGC $125 million aggregate principal amount of 8% Contingent Senior Notes during 2011. This was classified as an integration-related cost since the financial results of the Company, excluding Continental’s results, would not have resulted in a triggering event under the 8% Contingent Senior Notes indenture.

On December 31, 2012, UAL and United Air Lines, Inc. entered into an agreement with the PBGC that reduced the aggregate amount of 8% Contingent Senior Notes to be issued by UAL, and eliminated the contingent nature of such obligation by replacing the $188 million principal amount of 8% Contingent Senior Notes incurred as of December 31, 2012 and the obligation to issue any additional 8% Contingent Senior Notes with $400 million principal amount of new 8% Notes due 2024 (the “New 8% Notes”). In addition, UAL agreed to replace the $652 million principal amount outstanding of 6% Senior Notes due 2031 with $326 million principal amount of new 6% Notes due 2026 and $326 million principal amount of 6% Notes due 2028 (collectively, the “New 6% Notes” and together with the New 8% Notes, the “New PBGC Notes”). The Company did not receive any cash proceeds in connection with the issuance of the New PBGC Notes. The Company is accounting for this agreement as a debt extinguishment, resulting in a charge of $309 million in 2012 that represents the fair value of $212 million of New 8% Notes that it agreed to issue and the change in the fair value of the New 6% Notes and the $188 million of New 8% Notes versus their previous carrying values. The Company classified the expense as a component of special charges because the note restructuring would not have occurred if it were not for the Merger.

Labor agreement costs

In October 2013, fleet service, passenger service and storekeeper employees represented by the IAM ratified a joint collective bargaining agreement with the Company. The Company recorded a $127 million special charge for lump sum payments made in conjunction with the ratification. The lump sum payments are not in lieu of future pay increases. The Company completed substantially all cash payments in 2013.

In December 2012, the pilots represented by the Air Line Pilots Association, International ratified a new joint collective bargaining agreement with the Company. The Company recorded $475 million of expense associated with lump sum cash payments that would be made in conjunction with the ratification of the contract and the completion of the integrated pilot seniority list. This charge also includes $80 million associated with changes to existing pilot disability plans negotiated in connection with the agreement. The lump sum payments are not in lieu of future pay increases. The Company completed substantially all cash payments in 2013.

Severance and benefits

During 2013, the Company offered a voluntary retirement program for its fleet service, passenger service, storekeeper and pilot workgroups. Approximately 1,200 employees volunteered under the program during the fourth quarter of 2013 and United recorded approximately $64 million of costs for the programs. The Company also offered voluntary leave of absence programs which allows for continued medical coverage for flight attendants who volunteered during the leave of absence period, resulting in a charge of approximately $26 million. The remaining $15 million of severance and benefit costs is related to involuntary severance programs associated with flight attendants and other workgroups.

During 2012, the Company recorded $125 million of severance and benefits associated with various voluntary retirement and leave of absence programs for its various employee groups. During the first quarter of 2012, approximately 400 mechanics offered to retire early in exchange for a cash severance payment that was based on the number of years of service each employee had accumulated. The expense for this voluntary program was approximately $32 million. The Company also offered a voluntary leave of absence program that approximately 1,800 flight attendants accepted, which allows for continued medical coverage during the leave of absence period. The expense for this voluntary program was approximately $17 million. During the second quarter of 2012, as part of the recently amended collective bargaining agreement with the Association of Flight Attendants, the Company offered a voluntary program for flight attendants to retire early in exchange for a cash severance payment. The payments are dependent on the number of years of service each employee has accumulated. Approximately 1,300 flight attendants accepted this program and the expense for this voluntary program is approximately $76 million.

Asset impairments

During 2013 and 2012, the Company recorded impairment charges of $1 million and $30 million, respectively, on certain intangible assets including a route to Manila and European take-off and landing slots, respectively, in order to reflect the estimated fair value of these assets as part of its annual impairment test of indefinite-lived intangible assets.

In addition, during 2013, the Company recorded $32 million of impairment charges of its flight equipment held for disposal associated with its Boeing 737-300 and 737-500 fleets.

Temporary grounding of Boeing 787 aircraft

During 2013, the Company recorded $18 million associated with the temporary grounding of its Boeing 787 aircraft. The charges are comprised of aircraft depreciation expense and dedicated personnel costs that the Company incurred while the aircraft were grounded. The aircraft returned to service in May 2013.

Termination charges

During 2011, the Company recorded $58 million of charges related to the early termination of a maintenance service contract.

Gains on sale of assets and other special charges

During 2013, the Company adjusted its reserves for certain legal matters by $29 million and recorded approximately $11 million in accruals for future rent associated with the early retirement of four leased 757-200 aircraft. Additionally, the Company recorded a $5 million gain related to a contract termination and $3 million in gains on the sale of assets.

During 2012, the Company recorded net gains of $46 million related to gains and losses on the disposal of aircraft and related parts and other assets.

During 2011, other special charges included costs to terminate a maintenance service contract, adjustments to reserves for certain legal matters and gains and losses on the disposal of aircraft.

Special Revenue Item. As discussed in Note 1 of this report, during the second quarter of 2011, United modified the previously existing co-branded credit card agreements with Chase as a result of the Merger. In accordance with Accounting Standards Update 2009-13, Multiple-Deliverable Revenue Arrangements - a consensus of the FASB Emerging Issues Task Force (“ASU 2009-13”), the Company retroactively adjusted its existing deferred revenue balance to reflect the value of any undelivered element remaining at the date of contract modification as if we had been applying ASU 2009-13 since the initiation of the Co-Brand Agreement. We applied this transition provision by revaluing the undelivered air transportation element using its new estimated selling price as determined in connection with the contract modification. This estimated selling price was lower than the rate at which the undelivered element had been deferred under the previous co-branded credit card contracts, and as a result, we recorded a one-time non-cash adjustment to decrease frequent flyer deferred revenue and increase special revenues by $107 million in June 2011.

Accrual Activity

Activity related to the accruals for severance and medical costs and future lease payments on permanently grounded aircraft is as follows (in millions):


	Severance/ Medical Costs			Permanently Grounded Aircraft
Balance at December 31, 2010	$	102		$	41
Accrual		21			5
Payments		(68	)		(15	)

Balance at December 31, 2011		55			31
Accrual		170			(1	)
Payments		(160	)		(25	)

Balance at December 31, 2012		65			5
Accrual		120			10
Payments		(94	)		(4	)

Balance at December 31, 2013	$	91		$	11

The Company’s accrual and payment activity is primarily related to severance and other compensation expense associated with voluntary employee programs and the Merger, respectively.

In March 2013, the Company agreed to sell up to 30 Boeing 757-200 aircraft to FedEx Corporation beginning in April 2013. As of December 31, 2012, the Company operated 133 such aircraft. Given the planned sale of these 30 aircraft, the Company evaluated the entire fleet and determined that no impairment existed. In conjunction with that sale, the Company recorded accelerated depreciation of $89 million on these aircraft for the year ended December 31, 2013, and this is classified as Operating expense: Depreciation and amortization in the statements of consolidated operations. The accelerated depreciation resulted from changes in the estimated useful lives and salvage values of the 30 aircraft as a result of the planned sale. These changes in estimate decreased net income by amounts disclosed above and reduced per share amounts by approximately $0.26 per UAL basic share ($0.23 per UAL diluted share) for the year ended December 31, 2013.

Capacity Reduction. In February of 2014 the Company announced that it would be reducing its flying from Cleveland in stages beginning in April. The Company will reduce its average daily departures from Cleveland by around 60 percent. The decision to reduce flying was driven by continued losses in Cleveland, and the timing of the flight reductions was accelerated by industry-wide effects of new federal regulations that impact the Company and its regional partner flying. These new regulations impact the Company and its regional partner flying, as they have caused mainline airlines to hire regional pilots, while simultaneously significantly reducing the pool of new pilots from which regional carriers themselves can hire. Although this is an industry issue, it directly affects the Company and requires it to reduce regional partner flying, as several regional partners are beginning to have difficulty flying their schedules due to reduced new pilot availability. As a result, we will be reducing our average daily departures from Cleveland by approximately 60%. We expect to be able to keep almost all mainline departures (reducing only one of our 26 peak day mainline departures), but will need to reduce regional departures from Cleveland by over 70%. We will make these reductions in roughly one-third increments in each of early April, May and June 2014. When the schedule reductions are fully implemented in June, we plan to offer 72 peak-day flights from Cleveland, and serve 20 destinations from Cleveland on a non-stop basis. We currently expect to reduce up to 470 airport operations and catering positions in Cleveland. Those reductions will likely begin in June. The Company expects to record a special charge in 2014 related to the reduction in force and other contractual commitments at Cleveland. The Company is not currently able to estimate the amount of these charges or the time period in which they will be recorded, but such amounts could be significant.

Segment Information

12 Months Ended

Dec. 31, 2013

Segment Information

NOTE 18 - SEGMENT INFORMATION

Operating segments are defined as components of an enterprise with separate financial information, which are evaluated regularly by the chief operating decision maker and are used in resource allocation and performance assessments.

The Company deploys its aircraft across its route network through a single route scheduling system to maximize its value. When making resource allocation decisions, the Company’s chief operating decision maker evaluates flight profitability data, which considers aircraft type and route economics. The Company’s chief operating decision maker makes resource allocation decisions to maximize the Company’s consolidated financial results. Managing the Company as one segment allows management the opportunity to maximize the value of its route network.

The Company’s operating revenue by principal geographic region (as defined by the U.S. Department of Transportation) for the years ended December 31 is presented in the table below (in millions):


2013	UAL		United
Domestic (U.S. and Canada)	$	22,092	$	22,100
Pacific		5,794		5,794
Atlantic		7,132		7,132
Latin America		3,261		3,261

Total	$	38,279	$	38,287

2012
Domestic (U.S. and Canada)	$	21,276	$	21,284
Pacific		6,040		6,040
Atlantic		6,582		6,582
Latin America		3,254		3,254

Total	$	37,152	$	37,160

2011
Domestic (U.S. and Canada)	$	21,922	$	21,931
Pacific		5,404		5,404
Atlantic		6,675		6,675
Latin America		3,109		3,109

Total	$	37,110	$	37,119

The Company attributes revenue among the geographic areas based upon the origin and destination of each flight segment. The Company’s operations involve an insignificant level of dedicated revenue-producing assets in geographic regions as the overwhelming majority of the Company’s revenue producing assets (primarily U.S. registered aircraft) can be deployed in any of its geographic regions.

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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Selected Quarterly Financial Data (Unaudited)

Selected Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2013

NOTE 19 - SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)


UAL	Quarter Ended
(In millions, except per share amounts)	March 31		June 30		September 30		December 31
2013
Operating revenue	$	8,721	$	10,001	$	10,228	$	9,329
Income (loss) from operations		(264)		770		508		235
Net income (loss)		(417)		469		379		140
Basic earnings (loss) per share		(1.26)		1.37		1.06		0.39
Diluted earnings (loss) per share		(1.26)		1.21		0.98		0.37

2012
Operating revenue	$	8,602	$	9,939	$	9,909	$	8,702
Income (loss) from operations		(271)		575		200		(465)
Net income (loss)		(448)		339		6		(620)
Basic earnings (loss) per share		(1.36)		1.02		0.02		(1.87)
Diluted earnings (loss) per share		(1.36)		0.89		0.02		(1.87)

UAL’s quarterly financial data is subject to seasonal fluctuations and historically its second and third quarter financial results, which reflect higher travel demand, are better than its first and fourth quarter financial results. UAL’s quarterly results were impacted by the following significant items (in millions):


	Quarter Ended

	March 31		June 30		September 30		December 31
2013
Special charges (income):
Integration-related costs	$	70	$	45	$	50	$	40
Labor agreement costs		—		—		127		—
Severance and benefits		14		—		—		91
Asset impairments		—		—		—		33
Additional costs associated with the temporarily grounded Boeing 787 aircraft		11		7		—		—
(Gains) losses on sale of assets and other special charges, net		(3)		—		34		1

Total special items		92		52		211		165

Income tax benefit		—		—		—		(7)

Total special items, net of tax	$	92	$	52	$	211	$	158


2012
Special charges (income):
Integration-related costs	$	134	$	137	$	60	$	408
Labor agreement costs		—		—		454		21
Severance and benefits		49		76		—		—
Asset impairments		6		—		—		24
Gains on sale of assets and other special charges, net		(25)		(7)		—		(14)

Total special items		164		206		514		439

Income tax benefit		(2)		—		—		(9)

Total special items, net of tax	$	162	$	206	$	514	$	430

See Note 17 of this report for further discussion of these items.

Schedule II Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2013

Schedule II Valuation and Qualifying Accounts

Schedule II

Valuation and Qualifying Accounts

For the Years Ended December 31, 2013, 2012 and 2011


(In millions) Description	Balance at Beginning of Period		Additions Charged to Costs and Expenses		Deductions (a)		Other (b)		Balance at End of Period
Allowance for doubtful accounts - UAL:
2013	$	13	$	35	$	35	$	—	$	13
2012		7		12		6		—		13
2011		6		8		7		—		7
Allowance for doubtful accounts - United:
2013	$	13	$	35	$	35	$	—	$	13
2012		7		12		6		—		13
2011		6		8		7		—		7
Obsolescence allowance—spare parts - UAL:
2013	$	125	$	38	$	1	$	—	$	162
2012		89		40		4		—		125
2011		64		31		6		—		89
Obsolescence allowance—spare parts - United:
2013	$	125	$	38	$	1	$	—	$	162
2012		89		40		4		—		125
2011		64		31		6		—		89
Valuation allowance for deferred tax assets - UAL:
2013	$	4,603	$	7	$	888	$	84	$	3,806
2012		4,137		487		21		—		4,603
2011		4,171		333		367		—		4,137
Valuation allowance for deferred tax assets - United:
2013	$	4,503	$	8	$	898	$	163	$	3,776
2012		4,048		661		206		—		4,503
2011		4,008		371		331		—		4,048

(a) Deduction from reserve for purpose for which reserve was created.

(b) See Note 7 to the financial statements included in Part II, Item 8 of this report for additional information related to other valuation allowance adjustments.

Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2013

Use of Estimates and Reclassifications

(a)

Certain prior year cash flows from operating activities have been reclassified to conform to the current year presentation.

Passenger Revenue Recognition

(b)

The Company recognizes cargo and other revenue as service is provided.

Frequent Flyer Accounting

(c)

Miles Earned in Conjunction with Flights

Co-branded Credit Card Partner Mileage Sales

Expiration of Miles

Other Information

The following table provides additional information related to the frequent flyer program (in millions):


Year Ended December 31,	Cash Proceeds from Miles Sold		Other Revenue Recognized Upon Award of Miles to Third-Party Customers (a)		Increase in Frequent Flyer Deferred Revenue for Miles Awarded (b)		Increase (Decrease) in Advanced Purchase of Miles (c)
2013	$	2,903	$	903	$	2,174	$	(174)
2012		2,852		816		2,036		—
2011		3,121		566		2,357		198

(a) This amount represents other revenue recognized during the period from the sale of miles to third parties, representing the marketing-related deliverable services component of the sale.
(b) This amount represents the increase to frequent flyer deferred revenue during the period.
(c) This amount represents the net increase (decrease) in the advance purchase of miles obligation due to cash payments for the sale of miles in excess of (less than) miles awarded to customers.

Cash and Cash Equivalents and Restricted Cash

(d)	Cash and Cash Equivalents and Restricted Cash— Highly liquid investments with a maturity of three months or less on their acquisition date are classified as cash and cash equivalents.

Short-term Investments

(e)

Aircraft Fuel, Spare Parts and Supplies

(f)

Aircraft Fuel, Spare Parts and Supplies—The Company accounts for aircraft fuel, spare parts and supplies at average cost and provides an obsolescence allowance for aircraft spare parts and supplies.

Property and Equipment

(g)


	Estimated Useful Life (in years)
Aircraft and related rotable parts		25 to 30
Buildings		25 to 45
Other property and equipment		4 to 15
Computer software		5
Building improvements		1 to 40

Maintenance and Repairs

(h)

Lease Fair Value Adjustments

(i)

Lease Fair Value Adjustments—Lease fair value adjustments, which arose from recording operating leases at fair value under fresh start accounting or the Merger, are amortized on a straight line basis over the related lease term.

Regional Capacity Purchase

(j)

Regional Capacity Purchase—Payments made to regional carriers under CPAs are reported in Regional capacity purchase in our consolidated statements of operations.

Advertising

(k)	Advertising—Advertising costs, which are included in Other operating expenses, are expensed as incurred. Advertising expenses were $178 million, $154 million and $142 million for the years ended December 31, 2013, 2012 and 2011, respectively.

Intangibles

(l)

Long-Lived Asset Impairments

(m)

Share-Based Compensation

(n)

Ticket Taxes

(o)

Ticket Taxes—Certain governmental taxes are imposed on the Company’s ticket sales through a fee included in ticket prices. The Company collects these fees and remits them to the appropriate government agency. These fees are recorded on a net basis (excluded from operating revenue).

Retirement of Leased Aircraft

(p)

Uncertain Income Tax Positions

(q)

Labor Costs

(r)

Third Party Business

(s)

Related party receivables

(t)

Related party receivables—United has receivables from affiliates of $232 million that are classified against stockholder’s equity as of December 31, 2013 as a result of an anticipated distribution of the amount via an equity transaction planned in early 2014.

Recently Issued Accounting Standards

(u)

Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Schedule of Information Related to Amounts Recorded Related to Frequent Flyer Programs

The following table provides additional information related to the frequent flyer program (in millions):


Year Ended December 31,	Cash Proceeds from Miles Sold		Other Revenue Recognized Upon Award of Miles to Third-Party Customers (a)		Increase in Frequent Flyer Deferred Revenue for Miles Awarded (b)		Increase (Decrease) in Advanced Purchase of Miles (c)
2013	$	2,903	$	903	$	2,174	$	(174)
2012		2,852		816		2,036		—
2011		3,121		566		2,357		198

(a) This amount represents other revenue recognized during the period from the sale of miles to third parties, representing the marketing-related deliverable services component of the sale.
(b) This amount represents the increase to frequent flyer deferred revenue during the period.
(c) This amount represents the net increase (decrease) in the advance purchase of miles obligation due to cash payments for the sale of miles in excess of (less than) miles awarded to customers.

Estimated Useful Lives of Property and Equipment

The estimated useful lives of property and equipment are as follows:


	Estimated Useful Life (in years)
Aircraft and related rotable parts		25 to 30
Buildings		25 to 45
Other property and equipment		4 to 15
Computer software		5
Building improvements		1 to 40

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2013

Goodwill and Other Intangible Assets

The following table presents information about the Company’s goodwill and other intangible assets at December 31 (in millions):


		2013				2012
Item	Asset life (a)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Goodwill		$	4,523			$	4,523

Finite-lived intangible assets
Airport slots and gates	8	$	98	$	88	$	99	$	75
Hubs	20		145		59		145		52
Patents and tradenames	3		108		108		108		99
Frequent flyer database (b)	22		1,177		536		1,177		447
Contracts	13		167		86		167		75
Other	25		109		56		109		44

Total		$	1,804	$	933	$	1,805	$	792

Indefinite-lived intangible assets
Airport slots and gates		$	963			$	981
Route authorities			1,605				1,606
Tradenames and logos			593				593
Alliances			404				404

Total		$	3,565			$	3,584

(a) Weighted average life expressed in years.

Earnings (Loss) Per Share (Tables)

12 Months Ended

Dec. 31, 2013

Computation of Earnings Per Share


	2013		2012		2011
Basic earnings (loss) per share:
Net income (loss)	$	571	$	(723)	$	840
Less: Income allocable to participating securities		(2)		—		(3)

Earnings (loss) available to common stockholders	$	569	$	(723)	$	837


Basic weighted-average shares outstanding		348		331		329

Earnings (loss) per share, basic	$	1.64	$	(2.18)	$	2.54


Diluted earnings (loss) per share:
Earnings (loss) available to common stockholders	$	569	$	(723)	$	837
Effect of dilutive securities		26		—		27

Earnings (loss) available to common stockholders including the effect of dilutive securities	$	595	$	(723)	$	864


Diluted shares outstanding:
Basic weighted-average shares outstanding		348		331		329
Effect of convertible notes		42		—		52
Effect of employee stock options		—		—		2

Diluted weighted-average shares outstanding		390		331		383

Earnings (loss) per share, diluted	$	1.53	$	(2.18)	$	2.26


Potentially dilutive shares excluded from diluted per share amounts:
Restricted stock and stock options		3		5		6
Convertible notes		4		61		15

		7		66		21

Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2013

Schedule of Share-Based Compensation Plan Cost

The following table provides information related to UAL’s share-based compensation plan cost, for the years ended December 31 (in millions):


	2013		2012		2011
Compensation cost: (a)
RSUs	$	88	$	37	$	18
Restricted stock		11		13		12
Share-based awards converted to cash awards		1		6		19
Stock options		—		1		5

Total	$	100	$	57	$	54

Schedule of Unearned Compensation and Weighted Average Remaining Period for Outstanding Share-Based Awards


	Unearned Compensation		Weighted- Average Remaining Period (in years)
RSUs	$	36		1.3
Restricted stock		8		1.4
Stock options		—		0.6

Total	$	44

Schedule Of Restricted Stock Unit and Restricted Stock Activity

The table below summarizes UAL’s RSUs and restricted stock activity for the years ended December 31 (shares in millions):


	RSUs		Restricted Stock		Weighted- Average Grant Price
Non-vested at December 31, 2010		—		1	$	17.20
Granted		4		1		23.87
Vested		—		(1)		22.26
Surrendered		(1)		—		23.95

Non-vested at December 31, 2011		3		1		23.33
Granted		2		1		24.01
Vested		—		(1)		23.05
Surrendered		(1)		—		24.01

Non-vested at December 31, 2012		4		1		23.94
Granted		2		1		25.98
Vested		(1)		(1)		23.93
Surrendered		—		—		24.76

Non-vested at December 31, 2013		5		1		25.02

Stock Option Activity

The table below summarizes UAL stock option activity for the years ended December 31 (in millions, except as noted):


	Options		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (in years)		Aggregate Intrinsic Value
Outstanding at December 31, 2010		11	$	21.70
Exercised		(2)		10.77			$	33
Surrendered		(2)		29.07

Outstanding at December 31, 2011		7		23.80
Exercised		(1)		12.42				14
Surrendered		(1)		30.50

Outstanding at December 31, 2012		5		25.60
Exercised		(2)		16.28				27
Surrendered		—		27.49

Outstanding at December 31, 2013		3		31.63		2.2		18

Exercisable at December 31, 2013		3		32.00		2.2		16

Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2013

Components of Accumulated Other Comprehensive Income (Loss), Net of Tax

The tables below present the components of the Company’s accumulated other comprehensive income (loss) (“AOCI”), net of tax (in millions):


UAL (a)	Pension and Other Postretirement Unrecognized Actuarial Gains (Losses) and Prior Service Cost			Unrealized Gains (Losses) on Derivatives		Other		Total
Balance at December 31, 2010	$	152		$	240	$	(5)	$	387

Other comprehensive loss before reclassifications		(440)			163		—		(277)
Amounts reclassified from accumulated other comprehensive income		(24)			(503)		—		(527)

Net current-period other comprehensive income (loss)		(464)			(340)		—		(804)

Balance at December 31, 2011	$	(312)		$	(100)	$	(5)	$	(417)

Other comprehensive loss before reclassifications		(747)			(51)		11		(787)
Amounts reclassified from accumulated other comprehensive income		17			141		—		158

Net current-period other comprehensive income (loss)		(730)			90		11		(629)

Balance at December 31, 2012	$	(1,042)		$	(10)	$	6	$	(1,046)

Other comprehensive income before reclassifications		1,584	(b)		39		7		1,630
Amounts reclassified from accumulated other comprehensive income		42			(18)		—		24

Net current-period other comprehensive income (loss)		1,626			21		7		1,654

Balance at December 31, 2013	$	584		$	11	$	13	$	608


Details about AOCI Components	Amount Reclassified from AOCI to Income						Affected Line Item in the Statement Where Net Income is Presented
	Year Ended December 31,
	2013		2012		2011
Derivatives designated as cash flow hedges
Fuel contracts-reclassifications of (gains) losses into earnings (c)	$	(18)	$	141	$	(503)	Aircraft fuel
Amortization of pension and post-retirement items
Amortization of unrecognized (gains) losses and prior service cost and the effect of curtailments and settlements (c) (d)	$	42	$	17	$	(24)	Salaries and related costs

(b) For 2013, prior service credits increased by $331 million and actuarial gains increased by approximately $1.3 billion. Amounts for 2012 and 2011 were not material.

(c)	Income tax expense offset by Company’s valuation allowance.

(d) This accumulated other comprehensive income component is included in the computation of net periodic pension costs (see Note 8 of this report for additional details).

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Components of Income Tax Expense (Benefit)

The significant components of the income tax expense (benefit) are as follows (in millions):


2013	UAL		United
Current	$	(18)	$	(18)
Deferred		(14)		1

	$	(32)	$	(17)


2012
Current	$	(14)	$	(9)
Deferred		13		13

	$	(1)	$	4



2011
Current	$	11	$	3
Deferred		(6)		(5)

	$	5	$	(2)

Income Tax Provision Differed from Amounts Computed at Statutory Federal Income Tax Rate

The income tax provision differed from amounts computed at the statutory federal income tax rate, as follows (in millions):


Year ended December 31, 2013	UAL		United
Income tax provision at statutory rate	$	189	$	223
State income taxes, net of federal income tax		5		5
Foreign income taxes		3		3
Nondeductible employee meals		15		15
Nondeductible interest expense		—		—
Derivative market adjustment		—		(24)
Nondeductible compensation		3		3
State rate change		(33)		(33)
Valuation allowance		(219)		(229)
Other, net		5		20

	$	(32)	$	(17)

Year ended December 31, 2012
Income tax provision at statutory rate	$	(253)	$	(230)
State income taxes, net of federal income tax		(15)		(7)
Foreign income taxes		7		7
Nondeductible employee meals		12		12
Nondeductible interest expense		19		19
Derivative market adjustment		—		(15)
Nondeductible compensation		5		5
Valuation allowance		234		223
Other, net		(10)		(10)

	$	(1)	$	4

Year Ended December 31, 2011
Income tax provision at statutory rate	$	298	$	299
State income taxes, net of federal income tax		(19)		(17)
Nondeductible acquisition costs		(17)		(17)
Nondeductible employee meals		12		12
Nondeductible interest expense		13		13
Derivative market adjustment		—		10
Nondeductible compensation		9		10
Valuation allowance		(294)		(315)
Other, net		3		3

	$	5	$	(2)

Components of Deferred Tax Assets and Liabilities

Temporary differences and carryforwards that give rise to deferred tax assets and liabilities at December 31, 2013 and 2012 were as follows (in millions):


	UAL				United
	December 31,				December 31,
	2013		2012		2013		2012
Deferred income tax asset (liability):
Federal and state net operating loss (“NOL”) carryforwards	$	3,221	$	3,025	$	3,158	$	2,957
Frequent flyer deferred revenue		2,254		2,425		2,254		2,426
Employee benefits, including pension, postretirement, medical and the Pension Benefit Guaranty Corporation (“PBGC”) notes		1,701		2,488		1,701		2,491
Lease fair value adjustment		123		259		123		259
AMT credit carryforwards		233		251		233		251
Other assets		217		947		217		882
Less: Valuation allowance		(3,806)		(4,603)		(3,776)		(4,503)

Total deferred tax assets (a)	$	3,943	$	4,792	$	3,910	$	4,763


Depreciation, capitalized interest and other	$	(3,201)	$	(3,705)	$	(3,201)	$	(3,702)
Intangibles		(1,585)		(1,578)		(1,585)		(1,579)
Other liabilities		(144)		(509)		(111)		(406)

Total deferred tax liabilities	$	(4,930)	$	(5,792)	$	(4,897)	$	(5,687)

Net deferred tax liability (a)	$	(987)	$	(1,000)	$	(987)	$	(924)

Reconciliation of Unrecognized Tax Benefits

The following is a reconciliation of the beginning and ending amount of unrecognized tax benefits related to the Company’s uncertain tax positions (in millions):


	2013		2012		2011
Balance at January 1,	$	19	$	24	$	32
Decrease in unrecognized tax benefits relating to settlements with taxing authorities		—		(12)		—
Increase (decrease) in unrecognized tax benefits as a result of tax positions taken during a prior period		—		8		(9)
Decrease in unrecognized tax benefits relating from a lapse of the statute of limitations		(5)		(1)		—
Increase in unrecognized tax benefits as a result of tax positions taken during the current period		—		—		1

Balance at December 31,	$	14	$	19	$	24

Pension and Other Postretirement Plans (Tables)

12 Months Ended

Dec. 31, 2013

Reconciliation of Change in Projected Benefit Obligation and Plan Assets


	Pension Benefits
	Year Ended December 31, 2013		Year Ended December 31, 2012
Accumulated benefit obligation:	$	3,383	$	3,978


Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	4,526	$	3,708
Service cost		121		99
Interest cost		191		184
Actuarial (gain) loss		(464)		702
Gross benefits paid and settlements		(269)		(162)
Curtailments		(84)		—
Other		(21)		(5)

Projected benefit obligation at end of year	$	4,000	$	4,526


Change in plan assets:
Fair value of plan assets at beginning of year	$	2,157	$	1,868
Actual gain on plan assets		239		223
Employer contributions		277		228
Gross benefits paid and settlements		(269)		(162)
Other		(7)		—

Fair value of plan assets at end of year	$	2,397	$	2,157

Funded status—Net amount recognized	$	(1,603)	$	(2,369)


	Other Postretirement Benefits
	Year Ended December 31, 2013		Year Ended December 31, 2012
Change in benefit obligation:
Benefit obligation at beginning of year	$	2,743	$	2,541
Service cost		52		50
Interest cost		110		124
Plan participants’ contributions		67		77
Actuarial (gain) loss		(640)		110
Federal subsidy		7		13
Plan amendments		(331)		22
Curtailments		8		—
Gross benefits paid		(197)		(194)

Benefit obligation at end of year	$	1,819	$	2,743

Change in plan assets:
Fair value of plan assets at beginning of year	$	58	$	58
Actual return on plan assets		1		1
Employer contributions		128		116
Plan participants’ contributions		67		77
Benefits paid		(197)		(194)

Fair value of plan assets at end of year		57		58

Funded status—Net amount recognized	$	(1,762)	$	(2,685)

Amounts Recognized in Consolidated Balance Sheet and Accumulated Other Comprehensive Income (Loss)


	Pension Benefits
	December 31, 2013		December 31, 2012
Amounts recognized in the consolidated balance sheets consist of:
Noncurrent asset	$	49	$	35
Current liability		(2)		(4)
Noncurrent liability		(1,650)		(2,400)

Total liability	$	(1,603)	$	(2,369)

Amounts recognized in accumulated other comprehensive income (loss) consist of:
Net actuarial loss	$	(162)	$	(826)
Prior service credit		—		2

Total accumulated other comprehensive loss	$	(162)	$	(824)


	Other Postretirement Benefits
	December 31, 2013		December 31, 2012
Amounts recognized in the consolidated balance sheets consist of:
Current liability	$	(59)	$	(71)
Noncurrent liability		(1,703)		(2,614)

Total liability	$	(1,762)	$	(2,685)

Amounts recognized in accumulated other comprehensive income (loss) consist of:
Net actuarial gain (loss)	$	555	$	(79)
Prior service credit (cost)		306		(24)

Total accumulated other comprehensive income (loss)	$	861	$	(103)

Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets

The following information relates to all pension plans with an accumulated benefit obligation and a projected benefit obligation in excess of plan assets at December 31 (in millions):


	2013		2012
Projected benefit obligation	$	3,820	$	4,387
Accumulated benefit obligation		3,245		3,869
Fair value of plan assets		2,176		1,991

Components Of Net Periodic Benefit Cost

Net periodic benefit cost for the years ended December 31 included the following components (in millions):


	2013				2012				2011
	Pension Benefits		Other Postretirement Benefits		Pension Benefits		Other Postretirement Benefits		Pension Benefits		Other Postretirement Benefits
Service cost	$	121	$	52	$	99	$	50	$	88	$	47
Interest cost		191		110		184		124		178		127
Expected return on plan assets		(163)		(2)		(138)		(2)		(140)		(2)
Curtailment loss		2		2		—		—		—		—
Amortization of prior service credits		—		(3)		(1)		—		(2)		—
Settlement (gain) loss		(10)		—		1		—		1		—
Amortization of unrecognized actuarial (gain) loss		48		3		21		(3)		(20)		(2)

Net periodic benefit cost	$	189	$	162	$	166	$	169	$	105	$	170

Amortized Accumulated Other Comprehensive Income Into Net Periodic Benefit Cost

The estimated amounts that will be amortized in 2014 for actuarial (gains) losses are as follows (in millions):


	Pension Benefits		Other Postretirement Benefits
Actuarial (gain) loss to be reclassified from accumulated other comprehensive income into net periodic benefit cost	$	9	$	(46)

Assumptions Used for Benefit Plans

The assumptions used for the benefit plans were as follows:


	Pension Benefits
Assumptions used to determine benefit obligations	2013	2012
Discount rate	5.09%	4.19%
Rate of compensation increase	3.49%	2.49%

Assumptions used to determine net expense
Discount rate	4.48%	5.02%
Expected return on plan assets	7.56%	7.54%
Rate of compensation increase	2.48%	2.48%


	Other Postretirement Benefits
Assumptions used to determine benefit obligations	2013		2012
Discount rate		4.94%		4.12%

Assumptions used to determine net expense
Discount rate		4.12%		4.92%
Expected return on plan assets		4.00%		4.00%
Health care cost trend rate assumed for next year		7.25%		6.75%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate in 2020)		5.00%		5.00%

Allocation of Plan Asset

United’s plan assets are allocated within the following guidelines:


	Percent of Total	Expected Long-Term Rate of Return

Equity securities	42-52 %	9.5 %
Fixed-income securities	26-34	5.5
Alternatives	15-21	7.5
Other	3-7	4.5

Effect of One-Percentage-Point Change in Assumed Health Care Trend Rate

A 1% change in the assumed health care trend rate for the Company would have the following additional effects (in millions):


	1% Increase		1% Decrease
Effect on total service and interest cost for the year ended December 31, 2013	$	21	$	(17	)
Effect on postretirement benefit obligation at December 31, 2013		213		(186	)

Pension and Other Postretirement Plan Assets

The following tables present information about the United’s pension and other postretirement plan assets at December 31 (in millions):


	2013								2012
Pension Plan Assets:	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Equity securities funds	$	1,158	$	389	$	769	$	—	$	1,034	$	383	$	651	$	—
Fixed-income securities		702		—		698		4		611		—		609		2
Alternatives		405		—		199		206		394		—		234		160
Insurance contract		26		—		—		26		36		—		—		36
Other investments		106		—		106		—		82		—		82		—

Total	$	2,397	$	389	$	1,772	$	236	$	2,157	$	383	$	1,576	$	198

Other Postretirement Benefit Plan Assets:
Deposit administration fund	$	57	$	—	$	—	$	57	$	58	$	—	$	—	$	58

Defined Benefit Plan Assets Measured at Fair Value Using Unobservable Inputs (Level Three)

The reconciliation of United’s defined benefit plan assets measured at fair value using unobservable inputs (Level 3) for the years ended December 31, 2013 and 2012 is as follows (in millions):


	2013		2012
Balance at beginning of year	$	256	$	249
Actual return on plan assets:
Sold during the year		15		—
Held at year end		7		(47)
Purchases, sales, issuances and settlements (net)		15		54

Balance at end of year	$	293	$	256

Estimated Future Benefit Payments


	Pension		Other Postretirement		Other Postretirement— subsidy receipts
2014	$	247	$	122	$	6
2015		259		123		7
2016		265		126		7
2017		271		129		8
2018		268		132		9
Years 2019 – 2023		1,435		717		53

Multi-Employer Plans


Pension Fund		IAM National Pension Fund
EIN/ Pension Plan Number		51-6031295 - 002
Pension Protection Act Zone Status (2013 and 2012)*		Green Zone
FIP/RP Status Pending/Implemented		No
United’s Contributions		$38 million, $36 million and $34 million in the years ended December 31, 2013, 2012 and 2011, respectively
Surcharge Imposed		No
Expiration Date of Collective Bargaining Agreement		N/A

* Plans in the green zone are at least 80 percent funded.

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis


	2013								2012
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
	UAL
Cash and cash equivalents	$	3,220	$	3,220	$	—	$	—	$	4,770	$	4,770	$	—	$	—
Short-term investments:
Asset-backed securities		694		—		694		—		715		—		715		—
Corporate debt		685		—		685		—		537		—		537		—
Certificates of deposit placed through an account registry service (“CDARS”)		301		—		301		—		367		—		367		—
Auction rate securities		105		—		—		105		116		—		—		116
U.S. government and agency notes		38		—		38		—		12		—		12		—
Other fixed income securities		78		—		78		—		26		—		26		—
Enhanced equipment trust certificates (“EETC”)		61		—		—		61		63		—		—		63
Fuel derivatives, net		104		—		104		—		46		—		46		—
Foreign currency derivatives		1		—		1		—		—		—		—		—
Restricted cash		395		395		—		—		447		447		—		—

	United
Cash and cash equivalents	$	3,214	$	3,214	$	—	$	—	$	4,765	$	4,765	$	—	$	—
Short-term investments:
Asset-backed securities		694		—		694		—		715		—		715		—
Corporate debt		685		—		685		—		537		—		537		—
CDARS		301		—		301		—		367		—		367		—
Auction rate securities		105		—		—		105		116		—		—		116
U.S. government and agency notes		38		—		38		—		12		—		12		—
Other fixed income securities		78		—		78		—		26		—		26		—
EETC		61		—		—		61		63		—		—		63
Fuel derivatives, net		104		—		104		—		46		—		46		—
Foreign currency derivatives		1		—		1		—		—		—		—		—
Restricted cash		395		395		—		—		447		447		—		—
Convertible debt derivative asset		480		—		—		480		268		—		—		268
Convertible debt option liability		(270)		—		—		(270)		(128)		—		—		(128)

Activity for "Level Three" Financial Assets and Financial Liabilities

The tables below present disclosures about the activity for “Level 3” financial assets and financial liabilities for the year ended December 31 (in millions):


	2013								2012
	UAL and United				United				UAL and United				United
	Student Loan-Related Auction Rate Securities		EETC		Convertible Debt Supplemental Derivative Asset		Convertible Debt Conversion Option Liability		Student Loan-Related Auction Rate Securities		EETC		Convertible Debt Supplemental Derivative Asset		Convertible Debt Conversion Option Liability

Balance at January 1	$	116	$	63	$	268	$	(128)	$	113	$	60	$	193	$	(95)
Purchases, (sales), issuances and settlements (net)		(19)		(4)		—		—		—		(5)		—		—
Gains and (losses):
Reported in earnings:
Realized		3		—		—		—		—		—		—		—
Unrealized		1		—		212		(142)		1		—		75		(33)
Reported in other comprehensive income (loss)		4		2		—		—		2		8		—		—

Balance at December 31	$	105	$	61	$	480	$	(270)	$	116	$	63	$	268	$	(128)

Carrying Values and Estimated Fair Values of Financial Instruments

The table below presents the carrying values and estimated fair values of financial instruments not presented in the tables above for the years ended December 31 (in millions):


	Fair Value of Debt by Fair Value Hierarchy Level
	2013										2012
	Carrying Amount		Fair Value								Carrying Amount		Fair Value
			Total		Level 1		Level 2		Level 3				Total		Level 1		Level 2		Level 3
UAL debt	$	11,539	$	12,695	$	—	$	8,829	$	3,866	$	12,252	$	13,419	$	—	$	8,045	$	5,374
United debt		11,388		12,249		—		8,383		3,866		11,850		12,460		—		7,086		5,374

Fair Value Methodology for Company Financial Instruments

Fair value of the Company’s financial instruments was determined as follows:


Description		Fair Value Methodology
Cash and cash equivalents		The carrying amounts approximate fair value because of the short-term maturity of these assets.

Short-term investments and Restricted cash		Fair value is based on (a) the trading prices of the investment or similar instruments, (b) an income approach, which uses valuation techniques to convert future amounts into a single present amount based on current market expectations about those future amounts when observable trading prices are not available, (c) internally-developed models of the expected future cash flows related to the securities, or (d) broker quotes obtained by third-party valuation services.

Fuel derivatives		Derivative contracts are privately negotiated contracts and are not exchange traded. Fair value measurements are estimated with option pricing models that employ observable inputs. Inputs to the valuation models include contractual terms, market prices, yield curves, fuel price curves and measures of volatility, among others.
Foreign currency derivatives		Fair value is determined with a formula utilizing observable inputs. Significant inputs to the valuation models include contractual terms, risk-free interest rates and forward exchange rates.

Debt		Fair values were based on either market prices or the discounted amount of future cash flows using our current incremental rate of borrowing for similar liabilities.

Convertible debt derivative asset and option liability		United used a binomial lattice model to value the conversion options and the supplemental derivative assets. Significant binomial model inputs that are not objectively determinable include volatility and the Company’s credit risk component of the discount rate.

Level 3

Fair Value Methodology for Company Financial Instruments

Quantitative Information About Level 3 Fair Value Measurements as of December 31, 2013 ($ in millions)
Item	Fair Value at December 31, 2013			Valuation Technique	Unobservable Input	Range (Weighted Average)
Auction rate securities	$	105		Valuation Service / Broker Quotes	Broker quotes (a)	NA
EETC		61		Discounted Cash Flows	Structure credit risk (b)	4% - 5% (4%)
Convertible debt derivative asset		480		Binomial Lattice Model	Expected volatility (c) Own credit risk (d)	45% - 60% (46%) (5%)
Convertible debt option liability		(270	)	Binomial Lattice Model	Expected volatility (c) Own credit risk (d)	45% - 60% (47%) (5%)

(a) Broker quotes obtained by a third-party valuation service.

(b) Represents the credit risk premium of the EETC structure above the risk-free rate that the Company has determined market participants would use in pricing the instruments.

(c) Represents the range in volatility estimates that the Company has determined market participants would use when pricing the instruments.

(d) Represents the range of Company-specific risk adjustments that the Company has determined market participants would use as a model input.

Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2013

Description of Derivative Instruments

At December 31, the Company’s derivatives were reported in its consolidated balance sheets as follows (in millions):


Classification	Balance Sheet Location	2013		2012
Derivatives designated as cash flow hedges
Assets:
Fuel contracts due within one year	Receivables	$	19	$	7
Fuel contracts with maturities greater than one year	Other assets: Other, net		6		—

Total assets		$	25	$	7

Liabilities:
Fuel contracts due within one year	Current liabilities: Other	$	—	$	2

Derivatives not designated for hedge accounting
Assets:
Fuel contracts due within one year	Receivables	$	70	$	44
Fuel contracts with maturities greater than one year	Other assets: Other, net		9		—

Total assets		$	79	$	44

Liabilities:
Fuel contracts due within one year	Current liabilities: Other	$	—	$	2
Fuel contracts with maturities greater than one year	Other liabilities and deferred credits: Other		—		1

Total liabilities		$	—	$	3

Total derivatives
Assets:
Fuel contracts due within one year	Receivables	$	89	$	51
Fuel contracts with maturities greater than one year	Other assets: Other, net		15		—

Total assets		$	104	$	51

Liabilities:
Fuel contracts due within one year	Current liabilities: Other	$	—	$	4
Fuel contracts with maturities greater than one year	Other liabilities and deferred credits: Other		—		1

Total liabilities		$	—	$	5

Offsetting Assets and Liabilities

The following table shows the potential net fair value positions had we elected to offset. The table reflects offset at the counterparty level (in millions):


	Receivables		Other assets: Other, net		Hedge Derivatives, Net
2013	$	89	$	15	$	104
2012		46		—		46

Schedule of Gains (Losses) on Derivative Instruments

The following tables present the fuel hedge gains (losses) recognized during the periods presented and their classification in the financial statements (in millions):

Derivatives designated as cash flow hedges


	Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)				Gain (Loss) Reclassified from AOCI into Income (Fuel Expense) (Effective Portion)				Amount of Gain (Loss) Recognized in Nonoperating income (expense): Miscellaneous, net (Ineffective Portion)
	2013		2012		2013		2012		2013		2012
Fuel contracts	$	39	$	(51)	$	18	$	(141)	$	5	$	(1)

Schedule of Derivative Instruments not Designated as Hedges Gains (Losses)

Derivatives not designated for hedge accounting


	Amount of Gain Recognized in Nonoperating income (expense): Miscellaneous, net
	2013		2012		2011
Fuel contracts	$	79	$	38	$	—

Schedule of Derivative Credit Risk and Fair Value

The following table presents information related to the Company’s derivative credit risk as of December 31 (in millions):


	2013		2012
Net derivative assets with counterparties	$	104	$	46
Collateral held by the Company (classified as an other current liability)		—		—
Potential loss related to the failure of the Company’s counterparties to perform		104		46

Tabular disclosure of all significant concentrations of risk, including credit risk and market risk, arising from all financial instruments (as defined), whether from an individual counterparty or groups of counterparties. The disclosure concerning concentrations of risk may consist of the following information: (1) for concentrations of credit risk disclosure may include: (a) information about the (shared) activity, region, or economic characteristic that identifies the concentration, (b) the maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity, (c) the policy of requiring collateral or other security to support financial instruments subject to credit risk, information about the entity's access to that collateral or other security, and the nature and a brief description of the collateral or other security supporting those financial instruments, and (d) the policy of entering into master netting arrangements to mitigate the credit risk of financial instruments, information about the arrangements for which the entity is a party, and a brief description of the terms of those arrangements, including the extent to which they would reduce the entity's maximum amount of loss due to credit risk and (2) for disclosure of quantitative information about the market risks of financial instruments that is consistent with the way the company manages or adjusts those risks, disclosure may include: (a) more details about current positions and perhaps activity during the period, (b) the hypothetical effects on comprehensive income (or net assets), or annual income, of several possible changes in market prices, (c) a gap analysis of interest rate re-pricing or maturity dates, (d) the duration of the financial instruments, (e) the entity's value at risk from derivatives and from other positions at the end of the reporting period and the average value at risk during the year, or (f) other ways of reporting quantitative information as internally developed.

Contractual Principal Payments

Debt (Tables)

12 Months Ended

Dec. 31, 2013

Debt


(In millions)	At December 31,
	2013		2012
United:
Secured
Notes payable, fixed interest rates of 4.00% to 12.00% (weighted average rate of 6.50% as of December 31, 2013), payable through 2025	$	6,279	$	5,943
Notes payable, floating interest rates of the London Interbank Offered Rate (“LIBOR”) plus 0.20% to 5.46%, payable through 2025		1,243		1,668
Term loan, LIBOR subject to a 1% floor, plus 3%, or alternative rate based on certain market rates plus 2%, due 2019		893		—
Amended credit facility, LIBOR plus 2.0%, due 2014		—		1,201
6.75% senior secured notes due 2015		800		800
9.875% senior secured notes and 12% second lien due 2013		—		600
Unsecured
4.5% senior limited subordination convertible notes due 2021		156		156
6% notes due 2026 to 2028		652		652
6% senior notes due 2020		300		—
6% convertible junior subordinated debentures due 2030		248		248
6.375% senior notes due 2018		300		—
8% notes due 2024		400		400
4.5% convertible notes due 2015		230		230
Other		103		161

		11,604		12,059

Less: unamortized debt discount		(169)		(152)
Less: current portion of long-term debt—United		(1,368)		(1,812)

Long-term debt, net—United (a)	$	10,067	$	10,095


UAL:
6% convertible senior notes due 2029	$	104	$	345

Long-term debt, net—UAL	$	10,171	$	10,440

The table below presents the Company’s contractual principal payments at December 31, 2013 under then-outstanding long-term debt agreements in each of the next five calendar years (in millions):


	UAL		United
2014	$	1,368	$	1,368
2015		2,072		2,072
2016		1,051		1,051
2017		614		614
2018		1,135		1,135
After 2018		5,468		5,364

	$	11,708	$	11,604

Details of Pass Through Trusts

Certain details of the pass-through trusts are as follows (in millions, except interest rate):


EETC Date	Class	Principal		Final expected distribution date	Stated interest rate		Total debt recorded as of December 31, 2013		Proceeds received from issuance of debt during 2013		Remaining proceeds from issuance of debt to be received in future periods
August 2013	A	$	720	August 2025		4.3%	$	153	$	153	$	567
August 2013	B		209	August 2021		5.375%		44		44		165
December 2012	C		425	April 2018		6.125%		425		147		—
October 2012	A		712	October 2024		4.0%		712		465		—
October 2012	B		132	October 2020		5.5%		132		86		—

		$	2,198				$	1,466	$	895	$	732

Summary of Collateral Covenants and Cross Default Provisions

The collateral, covenants and cross default provisions of the Company’s principal debt instruments that contain such provisions are summarized in the table below:


Debt Instrument		Collateral, Covenants and Cross Default Provisions
Credit Agreement		Secured by certain of United’s international route authorities, specified take-off and landing slots at certain airports and certain other assets. The Credit Agreement requires the Company to maintain at least $3.0 billion of unrestricted liquidity at all times, which includes unrestricted cash, short-term investments and any undrawn amounts under any revolving credit facility and to maintain a minimum ratio of appraised value of collateral to the outstanding obligations under the Credit Agreement of 1.67 to 1.0 at all times. The Credit Agreement contains covenants that, among other things, restrict the ability of UAL and its restricted subsidiaries (as defined in the Credit Agreement) to incur additional indebtedness and to pay dividends on or repurchase stock. The Credit Agreement contains events of default customary for this type of financing, including a cross default and cross acceleration provision to certain other material indebtedness of the Company.
6% Notes due 2026 6% Notes due 2028		The amended and restated indenture for these notes, which are unsecured, contains covenants that, among other things, restrict the ability of the Company and its restricted subsidiaries (as defined in the indenture) to incur additional indebtedness and pay dividends on or repurchase stock. These covenants cease to be in effect when the indenture covering the 6.375% Senior Notes due 2018 is discharged. The indenture contains events of default that are customary for similar financings.
6.375% Senior Notes due 2018 6% Senior Notes due 2020		The indentures for these notes, which are unsecured, contain covenants that, among other things, restrict the ability of the Company and its restricted subsidiaries (as defined in the indenture) to incur additional indebtedness and pay dividends on or repurchase stock. The indentures contain events of default that are customary for similar financings.
6.75% Senior Notes due 2015		Secured by certain of United’s U.S.-Asia and U.S.-London Heathrow routes and related assets, all of the outstanding common stock and other assets of Air Micronesia, Inc. (“AMI”) and Continental Micronesia, Inc. (“CMI”) and substantially all of the other assets of AMI and CMI, including route authorities and related assets. The indenture for these notes includes covenants that, among other things, restrict United’s ability to sell assets, incur additional indebtedness, issue preferred stock, make investments and pay dividends on or repurchase stock. In addition, if United fails to maintain a collateral coverage ratio of 1.5 to 1.0, United must pay additional interest on the Senior Notes at the rate of 2% per annum until the collateral coverage ratio equals at least 1.5 to 1.0. The indenture for these notes also includes events of default customary for similar financings and a cross default provision if United fails to make payment when due with respect to certain obligations regarding frequent flyer miles purchased by Chase under United’s Co-Brand Agreement.

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

Future Minimum Lease Payments for Capital and Operating Leases

Leases and Capacity Purchase Agreements (Tables)

12 Months Ended

Dec. 31, 2013


	Capital Leases (a)		Facility and Other Operating Leases		Aircraft Operating Leases (b)
2014	$	206	$	1,192	$	1,601
2015		183		987		1,381
2016		168		864		1,150
2017		123		831		1,053
2018		106		710		786
After 2018		678		6,002		1,819

Minimum lease payments	$	1,464	$	10,586	$	7,790

Imputed interest		(594)

Present value of minimum lease payments		870
Current portion		(117)

Long-term obligations under capital leases	$	753

(b) The operating lease payments presented above include future payments of $103 million related to 25 nonoperating aircraft as of December 31, 2013.

Future Lease Payment Under Terms of Capacity Purchase Agreement

Based on these assumptions as of December 31, 2013, our future payments through the end of the terms of our CPAs are presented in the table below (in millions):


2014	$	1,936
2015		1,747
2016		1,532
2017		1,449
2018		1,340
After 2018		3,410

	$	11,414

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2013

Firm Commitments to Purchase Aircraft

As of December 31, 2013, United had firm commitments to purchase aircraft from The Boeing Company (“Boeing”), Embraer and Airbus S.A.S. (“Airbus”) presented in the table below:


Aircraft Type	Number of Firm Commitments (a)
Airbus A350-1000		35
Boeing 737-900ER		63
Boeing 737 MAX 9		100
Boeing 787-8/-9/-10		57
Embraer EMB175		30
(a) United also has options and purchase rights for additional aircraft.

Schedule of Acquisition of Aircrafts and Related Spare Engines


2014	$	3.0
2015		2.8
2016		2.0
2017		1.5
2018		2.1
After 2018		12.5

	$	23.9

Statement of Consolidated Cash Flows - Supplemental Disclosures (Tables)

12 Months Ended

Dec. 31, 2013

Supplemental Disclosures of Cash Flow Information and Non-Cash Investing and Financing Activities

Supplemental disclosures of cash flow information and non-cash investing and financing activities for the years ended December 31 are as follows (in millions):


2013	UAL		United
Cash paid (refunded) during the period for:
Interest (net of amounts capitalized)	$	752	$	752
Income taxes		(20)		(15)
Non-cash transactions:
Net property and equipment acquired through issuance of debt	$	229	$	229
Airport construction financing		40		40
Exchanges of certain 6% convertible senior notes for common stock		240		—

2012
Cash paid during the period for:
Interest (net of amounts capitalized)	$	766	$	766
Income taxes		2		4
Non-cash transactions:
Net property and equipment acquired through issuance of debt	$	544	$	544
8% Contingent Senior Unsecured Notes and 6% Senior Notes, net of discount		357		357
Special facility payment financing		101		101
Airport construction financing		50		50

2011
Cash paid during the period for:
Interest (net of amounts capitalized)	$	855	$	855
Income taxes		10		2
Non-cash transactions:
Net property and equipment acquired through issuance of debt	$	130	$	130
8% Contingent Senior Unsecured Notes, net of discount		88		88
Interest paid in kind on 6% Senior Notes		37		37

Integration-Related Costs and Special Items (Tables)

12 Months Ended

Dec. 31, 2013

Components of Integration-Related Costs and Special Items

Integration-related costs and special items classified as special charges in the statements of consolidated operations consisted of the following for the years ended December 31 (in millions):


	2013		2012		2011
Integration-related costs	$	205	$	739	$	517
Labor agreement costs		127		475		—
Severance and benefits		105		125		—
Asset impairments		33		30		4
Termination of maintenance service contract		—		—		58
Additional costs associated with the temporarily grounded Boeing 787 aircraft		18		—		—
(Gains) losses on sale of assets and other special charges, net		32		(46)		13

Total	$	520	$	1,323	$	592

Accrual Activity

Activity related to the accruals for severance and medical costs and future lease payments on permanently grounded aircraft is as follows (in millions):


	Severance/ Medical Costs			Permanently Grounded Aircraft
Balance at December 31, 2010	$	102		$	41
Accrual		21			5
Payments		(68	)		(15	)

Balance at December 31, 2011		55			31
Accrual		170			(1	)
Payments		(160	)		(25	)

Balance at December 31, 2012		65			5
Accrual		120			10
Payments		(94	)		(4	)

Balance at December 31, 2013	$	91		$	11

Segment Information (Tables)

12 Months Ended

Dec. 31, 2013

Operating Revenue by Principle Geographic Region

The Company’s operating revenue by principal geographic region (as defined by the U.S. Department of Transportation) for the years ended December 31 is presented in the table below (in millions):


2013	UAL		United
Domestic (U.S. and Canada)	$	22,092	$	22,100
Pacific		5,794		5,794
Atlantic		7,132		7,132
Latin America		3,261		3,261

Total	$	38,279	$	38,287

2012
Domestic (U.S. and Canada)	$	21,276	$	21,284
Pacific		6,040		6,040
Atlantic		6,582		6,582
Latin America		3,254		3,254

Total	$	37,152	$	37,160

2011
Domestic (U.S. and Canada)	$	21,922	$	21,931
Pacific		5,404		5,404
Atlantic		6,675		6,675
Latin America		3,109		3,109

Total	$	37,110	$	37,119

Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Schedule of Selected Quarterly Financial Data

UAL	Quarter Ended
(In millions, except per share amounts)	March 31		June 30		September 30		December 31
2013
Operating revenue	$	8,721	$	10,001	$	10,228	$	9,329
Income (loss) from operations		(264)		770		508		235
Net income (loss)		(417)		469		379		140
Basic earnings (loss) per share		(1.26)		1.37		1.06		0.39
Diluted earnings (loss) per share		(1.26)		1.21		0.98		0.37

2012
Operating revenue	$	8,602	$	9,939	$	9,909	$	8,702
Income (loss) from operations		(271)		575		200		(465)
Net income (loss)		(448)		339		6		(620)
Basic earnings (loss) per share		(1.36)		1.02		0.02		(1.87)
Diluted earnings (loss) per share		(1.36)		0.89		0.02		(1.87)

Schedule of Effect of Four Quarters Events

UAL’s quarterly results were impacted by the following significant items (in millions):


	Quarter Ended

	March 31		June 30		September 30		December 31
2013
Special charges (income):
Integration-related costs	$	70	$	45	$	50	$	40
Labor agreement costs		—		—		127		—
Severance and benefits		14		—		—		91
Asset impairments		—		—		—		33
Additional costs associated with the temporarily grounded Boeing 787 aircraft		11		7		—		—
(Gains) losses on sale of assets and other special charges, net		(3)		—		34		1

Total special items		92		52		211		165

Income tax benefit		—		—		—		(7)

Total special items, net of tax	$	92	$	52	$	211	$	158


2012
Special charges (income):
Integration-related costs	$	134	$	137	$	60	$	408
Labor agreement costs		—		—		454		21
Severance and benefits		49		76		—		—
Asset impairments		6		—		—		24
Gains on sale of assets and other special charges, net		(25)		(7)		—		(14)

Total special items		164		206		514		439

Income tax benefit		(2)		—		—		(9)

Total special items, net of tax	$	162	$	206	$	514	$	430

Significant Accounting Policies - Additional Information (Detail) $ in Millions	1 Months Ended	12 Months Ended
	Jun. 09, 2011 Item	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)
Significant Accounting Policies [Line Items]
Carrying value of computer software		$ 290	$ 302
Advertising expense		$ 178	154	$ 142
Minimum
Significant Accounting Policies [Line Items]
Refundable tickets expiration period		1 year
United Airlines, Inc.
Significant Accounting Policies [Line Items]
Receivable from related parties		$ 232
Co-Brand Agreement
Significant Accounting Policies [Line Items]
Number of elements identified in agreement \| Item	5
Computer software
Significant Accounting Policies [Line Items]
Depreciation expense related to computer software		$ 72	$ 81	$ 133
Aircraft and related rotable parts \| Minimum
Significant Accounting Policies [Line Items]
Residual values		10.00%
Aircraft and related rotable parts \| Maximum
Significant Accounting Policies [Line Items]
Residual values		11.00%

Schedule of Information Related to Amounts Recorded Related to Frequent Flyer Program (Detail) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Significant Accounting Policies [Line Items]

Cash Proceeds from Miles Sold

$ 2,903

$ 2,852

$ 3,121

Other Revenue Recognized Upon Award of Miles to Third-Party Customers

^[1]

903

816

566

Increase in Frequent Flyer Deferred Revenue for Miles Awarded

^[2]

2,174

$ 2,036

2,357

Increase (Decrease) in Advanced Purchase of Miles

^[3]

$ (174)

$ 198

[1]	This amount represents other revenue recognized during the period from the sale of miles to third parties, representing the marketing-related deliverable services component of the sale.
[2]	This amount represents the increase to frequent flyer deferred revenue during the period.
[3]	This amount represents the net increase (decrease) in the advance purchase of miles obligation due to cash payments for the sale of miles in excess of (less than) miles awarded to customers.

Estimated Useful Lives of Property and Equipment (Detail)	12 Months Ended
	Dec. 31, 2013
Aircraft and related rotable parts \| Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	25 years
Aircraft and related rotable parts \| Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	30 years
Buildings \| Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	25 years
Buildings \| Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	45 years
Other property and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	4 years
Other property and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	15 years
Computer software
Property, Plant and Equipment [Line Items]
Estimated Useful Life	5 years
Building improvements \| Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	1 year
Building improvements \| Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life	40 years

Goodwill and Other Intangible Assets (Detail) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Finite-lived intangible assets, Gross Carrying Amount

Goodwill

$ 4,523

1,804

1,805

Finite-lived intangible assets, Accumulated Amortization

933

792

Indefinite-lived intangible assets, Gross Carrying Amount

$ 3,565

3,584

Hubs

Finite-lived intangible assets, Gross Carrying Amount

^[1]

20 years

$ 145

145

Finite-lived intangible assets, Accumulated Amortization

$ 59

Patents And Trade Names

Finite-lived intangible assets, Gross Carrying Amount

^[1]

3 years

$ 108

108

Finite-lived intangible assets, Accumulated Amortization

$ 108

Frequent Flyer Database

Finite-lived intangible assets, Gross Carrying Amount

^[1],[2]

22 years

^[2]

$ 1,177

1,177

Finite-lived intangible assets, Accumulated Amortization

^[2]

$ 536

447

Contracts

Finite-lived intangible assets, Gross Carrying Amount

^[1]

13 years

$ 167

167

Finite-lived intangible assets, Accumulated Amortization

$ 86

Other Intangible Assets

Finite-lived intangible assets, Gross Carrying Amount

^[1]

25 years

$ 109

109

Finite-lived intangible assets, Accumulated Amortization

Route Authorities

Indefinite-lived intangible assets, Gross Carrying Amount

1,605

1,606

Tradenames And Logos

Indefinite-lived intangible assets, Gross Carrying Amount

593

Alliances

Indefinite-lived intangible assets, Gross Carrying Amount

$ 404

404

Airport Slots And Gates

Finite-lived intangible assets, Gross Carrying Amount

^[1]

8 years

$ 98

Finite-lived intangible assets, Accumulated Amortization

Indefinite-lived intangible assets, Gross Carrying Amount

$ 963

$ 981

[1]	Weighted average life expressed in years.
[2]	The frequent flyer database is amortized based on an accelerated amortization schedule to reflect utilization of the assets. Estimated cash flows correlating to the expected attrition rate of customers in the frequent flyer database is considered in the determination of the amortization schedules.

Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Actual and Estimated Amortization Expense [Line Items]
Actual amortization	$ 142	$ 121	$ 169
Projected amortization in 2014	128
Projected amortization in 2015	106
Projected amortization in 2016	92
Projected amortization in 2017	81
Projected amortization in 2018	$ 72

Common Stockholders' Equity and Preferred Securities - Additional Information (Detail) $ / shares in Units, $ in Millions	2 Months Ended
	Feb. 20, 2014 USD ($)	Dec. 31, 2013 $ / shares shares	Nov. 30, 2013	Jun. 30, 2011
Schedule Of Stockholders Equity [Line Items]
Common stock reserved for future issuance		44,000,000
Junior preferred stock outstanding		2
Junior preferred stock par value per share \| $ / shares		$ 0.01
Preferred stock authorized to issue		250,000,000
Unsecured Debt
Schedule Of Stockholders Equity [Line Items]
Debt instrument stated interest rate			6.00%
United Airlines, Inc. \| Unsecured Debt
Schedule Of Stockholders Equity [Line Items]
Debt instrument stated interest rate				4.50%
Subsequent Event \| United Airlines, Inc. \| Unsecured Debt
Schedule Of Stockholders Equity [Line Items]
Debt instument converted amount \| $	$ 156
Debt instrument stated interest rate	4.50%
Debt instrument, maturity date	2021
Debt instument convertion rate	30.6419

Computation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Basic earnings (loss) per share:
Net income (loss)	$ 140	$ 379	$ 469	$ (417)	$ (620)	$ 6	$ 339	$ (448)	$ 571	$ (723)	$ 840
Less: Income allocable to participating securities									(2)		(3)
Earnings (loss) available to common stockholders									$ 569	$ (723)	$ 837
Basic weighted-average shares outstanding									348	331	329
Earnings (loss) per share, basic	$ 0.39	$ 1.06	$ 1.37	$ (1.26)	$ (1.87)	$ 0.02	$ 1.02	$ (1.36)	$ 1.64	$ (2.18)	$ 2.54
Diluted earnings (loss) per share:
Earnings (loss) available to common stockholders									$ 569	$ (723)	$ 837
Effect of dilutive securities									26		27
Earnings (loss) available to common stockholders including the effect of dilutive securities									$ 595	$ (723)	$ 864
Diluted shares outstanding:
Basic weighted-average shares outstanding									348	331	329
Effect of convertible notes									42		52
Effect of employee stock options											2
Diluted weighted-average shares outstanding									390	331	383
Earnings (loss) per share, diluted	$ 0.37	$ 0.98	$ 1.21	$ (1.26)	$ (1.87)	$ 0.02	$ 0.89	$ (1.36)	$ 1.53	$ (2.18)	$ 2.26
Potentially dilutive shares excluded from diluted per share amounts:
Potentially dilutive shares excluded from diluted per share amounts									7	66	21
Restricted Stock And Stock Options
Potentially dilutive shares excluded from diluted per share amounts:
Potentially dilutive shares excluded from diluted per share amounts									3	5	6
Convertible Notes
Potentially dilutive shares excluded from diluted per share amounts:
Potentially dilutive shares excluded from diluted per share amounts									4	61	15

Share-Based Compensation Plans - Additional Information (Detail) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2013 USD ($) d shares	Dec. 31, 2012 USD ($) shares	Dec. 31, 2011 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of days used to compute performance period average closing price of restricted stock units \| d	20
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, contractual term, years	10 years
Employee Stock Option \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, vesting period	3 years
Employee Stock Option \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, vesting period	4 years
Management Level Employee Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, contractual term, years	5 years
Outside directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, contractual term, years	10 years
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, award granted	0.5
Share-Based Compensation, vesting period	3 years
Share-Based Compensation, award granted	2.0	2.0	4.0
Liabilities related to share based payments \| $	$ 118
Payment related to share-based liabilities \| $	29	$ 35	$ 57
Equity awards fair value \| $	$ 22	$ 27	$ 7
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, award granted	0.5
Share-Based Compensation, vesting period	3 years
Share-Based Compensation, award granted	1.0	1.0	1.0
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, vesting period	3 years
Share-Based Compensation, award granted	1.3
Share-Based Compensation, vesting date	Dec. 31, 2015

Schedule of Share-Based Compensation Plan Cost (Detail) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

^[1]

$ 100

$ 57

$ 54

RSUs

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

^[1]

Restricted Stock

Share-Based Awards Converted To Cash Awards

^[1]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

^[1]

$ 1

Stock Options

Accumulated Other Comprehensive Income (Loss) [Line Items]

^[1]

$ 1

$ 5

[1]	All compensation cost is recorded to Salaries and related costs, with the exception of $9 million, $9 million and $17 million in 2013, 2012 and 2011, respectively, that was recorded in integration-related costs as a component of special charges.

Schedule of Share-Based Compensation Plan Cost (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Integration related costs	$ 40	$ 50	$ 45	$ 70	$ 408	$ 60	$ 137	$ 134	$ 205	$ 739	$ 517
Special Charges
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Integration related costs									$ 9	$ 9	$ 17

Schedule of Unearned Compensation and Weighted Average Remaining Period for Outstanding Share-Based Awards (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2013 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned Compensation	$ 44
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned Compensation	$ 36
Weighted- Average Remaining Period (in years)	1 year 3 months 18 days
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned Compensation	$ 8
Weighted- Average Remaining Period (in years)	1 year 4 months 24 days
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted- Average Remaining Period (in years)	7 months 6 days

Schedule of Restricted Stock Unit and Restricted Stock Activity (Detail) - $ / shares shares in Millions	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested at beginning of year	4	3
Granted, Stock	2	2	4
Vested, Stock	(1)
Surrendered, Stock		(1)	(1)
Non-vested at end of year, Stock	5	4	3
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested at beginning of year	1	1	1
Granted, Stock	1	1	1
Vested, Stock	(1)	(1)	(1)
Non-vested at end of year, Stock	1	1	1
Weighted- Average Grant Price at beginning of year	$ 23.94	$ 23.33	$ 17.20
Granted, Weighted- Average Grant Price	25.98	24.01	23.87
Vested, Weighted- Average Grant Price	23.93	23.05	22.26
Surrendered, Weighted- Average Grant Price	24.76	24.01	23.95
Non-vested at end of year, Weighted- Average Grant Price	$ 25.02	$ 23.94	$ 23.33

Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Outstanding at beginning of year	5	7	11
Exercised, Options	(2)	(1)	(2)
Surrendered, Options		(1)	(2)
Options, Outstanding at end of year	3	5	7
Weighted- Average Exercise Price, Outstanding at beginning of year	$ 25.60	$ 23.80	$ 21.70
Exercisable at end of period, Options	3
Exercised, Weighted- Average Exercise Price	$ 16.28	12.42	10.77
Surrendered, Weighted- Average Exercise Price	27.49	30.50	29.07
Weighted- Average Exercise Price, Outstanding at end of year	31.63	$ 25.60	$ 23.80
Exercisable at end of period, Weighted- Average Exercise Price	$ 32.00
Weighted- Average Remaining Contractual Life , Outstanding at end of year, in years	2 years 2 months 12 days
Weighted- Average Remaining Contractual Life , exercisable at end of year, in years	2 years 2 months 12 days
Exercised, Aggregate Intrinsic Value	$ 27	$ 14	$ 33
Aggregate Intrinsic Value, Outstanding at end of period	18
Aggregate Intrinsic Value , Exercisable at end of period	$ 16

Components of Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Other comprehensive income (loss) before reclassifications

^[1]

$ (1,046)

$ (417)

$ 387

^[1]

1,630

(787)

(277)

Amounts reclassified from accumulated other comprehensive income

^[1]

158

(527)

^[1]

1,654

(629)

(804)

Pension and Other Postretirement Unrecognized Actuarial Gains (Losses) and Prior Service Cost

^[1]

608

(1,046)

(417)

Accumulated Other Comprehensive Income (Loss) [Line Items]

Other comprehensive income (loss) before reclassifications

^[1]

(1,042)

(312)

152

^[1]

1,584

^[2]

(747)

(440)

Amounts reclassified from accumulated other comprehensive income

^[1]

(24)

^[1]

1,626

(730)

(464)

Unrealized Gains (Losses) on Derivatives

^[1]

584

(1,042)

(312)

Accumulated Other Comprehensive Income (Loss) [Line Items]

Other comprehensive income (loss) before reclassifications

^[1]

(10)

(100)

240

^[1]

(51)

163

Amounts reclassified from accumulated other comprehensive income

^[1]

(18)

141

(503)

^[1]

(340)

^[1]

(10)

(100)

Accumulated Other Comprehensive Income (Loss) [Line Items]

Other comprehensive income (loss) before reclassifications

^[1]

(5)

^[1]

^[1]

^[1]

$ 13

$ 6

$ (5)

[1]	UAL and United amounts are substantially the same except for an additional $6 million of income tax benefit at United in 2013. In addition, United had additional (losses) gains related to investments and other of $(2) million, $1 million and $1 million in 2011, 2012 and 2013, respectively.
[2]	For 2013, prior service credits increased by $331 million and actuarial gains increased by approximately $1.3 billion. Amounts for 2012 and 2011 were not material.

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

Salaries And Related Costs

Details about Accumulated Other Comprehensive Income Components (Detail) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Accumulated Other Comprehensive Income (Loss) [Line Items]

Amortization of unrecognized (gains) losses and prior service cost and the effect of curtailments and settlements

^[1],[2]

$ 42

$ 17

$ (24)

Fuel Oil Contract | Cash Flow Hedging | Aircraft Fuel

Accumulated Other Comprehensive Income (Loss) [Line Items]

Fuel contracts-reclassifications of (gains) losses into earnings

^[1]

$ (18)

$ 141

$ (503)

[1]	Income tax expense offset by Company's valuation allowance.
[2]	This accumulated other comprehensive income component is included in the computation of net periodic pension costs (see Note 8 of this report for additional details.)

Components of Accumulated Other Comprehensive Income (Loss), Net of Tax (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Increase in prior service credits	$ 331
Increase in actuarial gains	1,300
United Airlines, Inc.
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income Tax Expense	6
Additional (losses) gains related to investments and other	$ 1	$ 1	$ (2)

Components of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components Of Income Tax Expense Benefit [Line Items]
Current				$ (18)	$ (14)	$ 11
Deferred				(14)	13	(6)
Income tax benefit	$ (7)	$ (9)	$ (2)	(32)	(1)	5
United Airlines, Inc.
Components Of Income Tax Expense Benefit [Line Items]
Current				(18)	(9)	3
Deferred				1	13	(5)
Income tax benefit				$ (17)	$ 4	$ (2)

Income Tax Provision Differed from Amounts Computed at Statutory Federal Income Tax Rate (Detail) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Income tax provision at statutory rate				$ 189	$ (253)	$ 298
State income taxes, net of federal income tax				5	(15)	(19)
Foreign income taxes				3	7
Nondeductible acquisition costs						(17)
Nondeductible employee meals				15	12	12
Nondeductible interest expense					19	13
Nondeductible compensation				3	5	9
State rate change				(33)
Valuation allowance				(219)	234	(294)
Other, net				5	(10)	3
Income tax benefit	$ (7)	$ (9)	$ (2)	(32)	(1)	5
United Airlines, Inc.
Income Taxes [Line Items]
Income tax provision at statutory rate				223	(230)	299
State income taxes, net of federal income tax				5	(7)	(17)
Foreign income taxes				3	7
Nondeductible acquisition costs						(17)
Nondeductible employee meals				15	12	12
Nondeductible interest expense					19	13
Derivative market adjustment				(24)	(15)	10
Nondeductible compensation				3	5	10
State rate change				(33)
Valuation allowance				(229)	223	(315)
Other, net				20	(10)	3
Income tax benefit				$ (17)	$ 4	$ (2)

Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions

Dec. 31, 2013

Dec. 31, 2012

Deferred income tax asset (liability):

Federal and state net operating loss ("NOL") carryforwards

$ 3,221

$ 3,025

Employee benefits, including pension, postretirement, medical and the Pension Benefit Guaranty Corporation ("PBGC") notes

2,254

2,425

1,701

2,488

Lease fair value adjustment

123

259

AMT credit carryforwards

233

251

Other assets

217

947

Less: Valuation allowance

(3,806)

(4,603)

Total deferred tax assets

^[1]

3,943

4,792

Depreciation, capitalized interest and other

(3,201)

(3,705)

Intangibles

(1,585)

(1,578)

Other liabilities

(144)

(509)

Total deferred tax liabilities

(4,930)

(5,792)

Net deferred tax liability

^[1]

(987)

(1,000)

Deferred income tax asset (liability):

Federal and state net operating loss ("NOL") carryforwards

3,158

2,957

Employee benefits, including pension, postretirement, medical and the Pension Benefit Guaranty Corporation ("PBGC") notes

2,254

2,426

1,701

2,491

Lease fair value adjustment

123

259

AMT credit carryforwards

233

251

Other assets

217

882

Less: Valuation allowance

(3,776)

(4,503)

Total deferred tax assets

^[1]

3,910

4,763

Depreciation, capitalized interest and other

(3,201)

(3,702)

Intangibles

(1,585)

(1,579)

Other liabilities

(111)

(406)

Total deferred tax liabilities

(4,897)

(5,687)

Net deferred tax liability

^[1]

$ (987)

$ (924)

[1]

During 2013, UAL identified adjustments to the components of the deferred taxes. As a result of this analysis, changes in deferred tax assets and liabilities occurred, and are reflected in 2013 deferred tax balances. UAL and United increased their valuation allowance to reflect these adjustments by $84 million and $163 million, respectively. United separately identified an adjustment of $68 million to increase its deferred tax liability with an offset to United-only equity to correct an error made in prior years. This item did not affect the consolidated accounts of UAL. It was corrected in the current period as it was not considered material to United's prior year reported financial position.

Components of Deferred Tax Assets and Liabilities (Parenthetical) (Detail)
$ in Millions

12 Months Ended

Dec. 31, 2013

USD ($)

Valuation allowance for deferred tax assets

Deferred Income Tax Assets And Liabilities [Line Items]

Valuation allowance adjustments

$ 84

^[1]

Deferred Income Tax Assets And Liabilities [Line Items]

Tax adjustment

United Airlines, Inc. | Valuation allowance for deferred tax assets

Deferred Income Tax Assets And Liabilities [Line Items]

Valuation allowance adjustments

$ 163

^[1]

[1]	See Note 7 to the financial statements included in Part II, Item 8 of this report for additional information related to other valuation allowance adjustments.

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Unrecorded tax benefit	$ 800
Federal pre-tax NOL carry forwards	10,900
State tax benefits	$ 168
Cumulative loss position at the end of 2013	3 years
Percentage of cumulative pretax income related to revenue	0.60%
Current valuation allowances	$ 3,806	$ 4,603
Increase (decrease) in current valuation allowances	(797)
Unrecognized tax benefits	14	19	$ 24	$ 32
Unrecognized tax benefits that would impact effective tax rate if recognized	12
United Airlines, Inc.
Income Taxes [Line Items]
Current valuation allowances	3,776	$ 4,503
Increase (decrease) in current valuation allowances	(727)
2022
Income Taxes [Line Items]
Net operating loss expiration amount	1,400
2023
Income Taxes [Line Items]
Net operating loss expiration amount	1,900
2024
Income Taxes [Line Items]
Net operating loss expiration amount	2,400
2025
Income Taxes [Line Items]
Net operating loss expiration amount	2,000
Thereafter
Income Taxes [Line Items]
Net operating loss expiration amount	$ 3,200
Minimum
Income Taxes [Line Items]
State tax benefits of the NOL carry forwards expiration period, years	5 years
Maximum
Income Taxes [Line Items]
State tax benefits of the NOL carry forwards expiration period, years	20 years

Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Contingency [Line Items]
Balance at January 1,	$ 19	$ 24	$ 32
Decrease in unrecognized tax benefits relating to settlements with taxing authorities		(12)
Increase (decrease) in unrecognized tax benefits as a result of tax positions taken during a prior period		8	(9)
Decrease in unrecognized tax benefits relating from a lapse of the statute of limitations	(5)	(1)
Increase in unrecognized tax benefits as a result of tax positions taken during the current period			1
Balance at December 31,	$ 14	$ 19	$ 24

Pension and Other Postretirement Plans - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2013 USD ($) yr	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Pilot retirement age \| yr	65
Effect on post retirement benefit obligation, 1% Decrease	$ 203
Effect on total service and interest cost,1% Decrease	10
Profit sharing and payroll tax expense	$ 190	$ 119	$ 265
Multiemployer Plans, Pension \| IAM National Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Multi-employer plan contributions		$ 351
Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, service period	20 years
Percentage of pre-tax earnings paid for profit sharing plan	5.00%
Share-based compensation program pre-tax profits excluding special items, profit sharing expense and share-based compensation program expense threshold	$ 10
Minimum \| Multiemployer Plans, Pension \| IAM National Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Percent of company's contribution to plan		5.00%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Percentage of pre-tax earnings paid for profit sharing plan	20.00%
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Effect on post retirement benefit obligation, 1% Decrease	$ (186)
Effect on total service and interest cost,1% Decrease	(17)
Employer contributions	$ 128	$ 116
Other Postretirement Benefits \| Deposit Administration Fund
Defined Benefit Plan Disclosure [Line Items]
Target allocation of plan assets	100.00%
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 277	228
United Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	433	330	291
United Airlines, Inc. \| Multiemployer Plans, Pension \| IAM National Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Multi-employer plan contributions	$ 38	$ 36	$ 34
United Airlines, Inc. \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Employer contribution, percentage	1.00%
United Airlines, Inc. \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Employer contribution, percentage	16.00%
United Airlines, Inc. \| Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 120
United Airlines, Inc. \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 288

Reconciliation of Change in Projected Benefit Obligation and Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of year	$ 256	$ 249
Balance at end of year	293	256	$ 249
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation:	3,383	3,978
Benefit obligation at beginning of year	4,526	3,708
Service cost	121	99	88
Interest cost	191	184	178
Actuarial (gain) loss	(464)	702
Gross benefits paid and settlements	(269)	(162)
Curtailments	(84)
Other	(21)	(5)
Benefit obligation at end of year	4,000	4,526	3,708
Balance at beginning of year	2,157	1,868
Actual return on plan assets	239	223
Employer contributions	277	228
Gross benefits paid and settlements	(269)	(162)
Other	(7)
Balance at end of year	2,397	2,157	1,868
Funded status-Net amount recognized	(1,603)	(2,369)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	2,743	2,541
Service cost	52	50	47
Interest cost	110	124	127
Plan participants' contributions	67	77
Actuarial (gain) loss	(640)	110
Federal subsidy	7	13
Plan amendments	(331)	22
Curtailments	8
Gross benefits paid	(197)	(194)
Benefit obligation at end of year	1,819	2,743	2,541
Balance at beginning of year	58	58
Actual return on plan assets	1	1
Employer contributions	128	116
Plan participants' contributions	67	77
Benefits paid	(197)	(194)
Balance at end of year	57	58	$ 58
Funded status-Net amount recognized	$ (1,762)	$ (2,685)

Amounts Recognized in Consolidated Balance Sheet and Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	Dec. 31, 2013	Dec. 31, 2012
Pension Benefits
Amounts recognized in the consolidated balance sheets consist of:
Noncurrent asset	$ 49	$ 35
Current liability	(2)	(4)
Noncurrent liability	(1,650)	(2,400)
Total liability	(1,603)	(2,369)
Amounts recognized in accumulated other comprehensive income (loss) consist of:
Net actuarial gain (loss)	(162)	(826)
Prior service credit (cost)		2
Total accumulated other comprehensive income (loss)	(162)	(824)
Other Postretirement Benefits
Amounts recognized in the consolidated balance sheets consist of:
Current liability	(59)	(71)
Noncurrent liability	(1,703)	(2,614)
Total liability	(1,762)	(2,685)
Amounts recognized in accumulated other comprehensive income (loss) consist of:
Net actuarial gain (loss)	555	(79)
Prior service credit (cost)	306	(24)
Total accumulated other comprehensive income (loss)	$ 861	$ (103)

Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 3,820	$ 4,387
Accumulated benefit obligation	3,245	3,869
Fair value of plan assets	$ 2,176	$ 1,991

Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 121	$ 99	$ 88
Interest cost	191	184	178
Expected return on plan assets	(163)	(138)	(140)
Curtailment loss	2
Amortization of prior service credits		(1)	(2)
Settlement (gain) loss	(10)	1	1
Amortization of unrecognized actuarial (gain) loss	48	21	(20)
Net periodic benefit cost	189	166	105
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	52	50	47
Interest cost	110	124	127
Expected return on plan assets	(2)	(2)	(2)
Curtailment loss	2
Amortization of prior service credits	(3)
Amortization of unrecognized actuarial (gain) loss	3	(3)	(2)
Net periodic benefit cost	$ 162	$ 169	$ 170

Amortized Accumulated Other Comprehensive Income Into Net Periodic Benefit Cost (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2013 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss to be reclassified from accumulated other comprehensive income into net periodic benefit cost	$ 9
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss to be reclassified from accumulated other comprehensive income into net periodic benefit cost	$ (46)

Assumptions Used for Benefit Plans (Detail)	12 Months Ended
Assumptions Used for Benefit Plans (Detail)	Dec. 31, 2013	Dec. 31, 2012
Pension Benefits
Assumptions used to determine benefit obligations
Discount rate	5.09%	4.19%
Rate of compensation increase	3.49%	2.49%
Assumptions used to determine net expense
Discount rate	4.48%	5.02%
Expected return on plan assets	7.56%	7.54%
Rate of compensation increase	2.48%	2.48%
Other Postretirement Benefits
Assumptions used to determine benefit obligations
Discount rate	4.94%	4.12%
Assumptions used to determine net expense
Discount rate	4.12%	4.92%
Expected return on plan assets	4.00%	4.00%
Health care cost trend rate assumed for next year	7.25%	6.75%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate in 2020)	5.00%	5.00%

Allocation of Plan Asset (Detail) - United Airlines, Inc.	12 Months Ended
	Dec. 31, 2013
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Percent of Total, minimum	42.00%
Percent of Total, maximum	52.00%
Expected Long-Term Rate of Return	9.50%
Fixed-Income Securities
Defined Benefit Plan Disclosure [Line Items]
Percent of Total, minimum	26.00%
Percent of Total, maximum	34.00%
Expected Long-Term Rate of Return	5.50%
Alternatives
Defined Benefit Plan Disclosure [Line Items]
Percent of Total, minimum	15.00%
Percent of Total, maximum	21.00%
Expected Long-Term Rate of Return	7.50%
Other Investments
Defined Benefit Plan Disclosure [Line Items]
Percent of Total, minimum	3.00%
Percent of Total, maximum	7.00%
Expected Long-Term Rate of Return	4.50%

Effect of One-Percentage-Point Change in Assumed Health Care Trend Rate (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2013 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Effect on total service and interest cost,1% Decrease	$ 10
Effect on post retirement benefit obligation, 1% Decrease	203
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Effect on total service and interest cost,1% Increase	21
Effect on post retirement benefit obligation, 1% Increase	213
Effect on total service and interest cost,1% Decrease	(17)
Effect on post retirement benefit obligation, 1% Decrease	$ (186)

Pension and Other Postretirement Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	$ 293	$ 256	$ 249
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	2,397	2,157	1,868
Pension Benefits \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	1,158	1,034
Pension Benefits \| Fixed-Income Securities
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	702	611
Pension Benefits \| Alternatives
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	405	394
Pension Benefits \| Insurance Contract
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	26	36
Pension Benefits \| Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	106	82
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	57	58	$ 58
Other Postretirement Benefits \| Deposit Administration Fund
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	57	58
Level 1 \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	389	383
Level 1 \| Pension Benefits \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	389	383
Level 2 \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	1,772	1,576
Level 2 \| Pension Benefits \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	769	651
Level 2 \| Pension Benefits \| Fixed-Income Securities
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	698	609
Level 2 \| Pension Benefits \| Alternatives
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	199	234
Level 2 \| Pension Benefits \| Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	106	82
Level 3 \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	236	198
Level 3 \| Pension Benefits \| Fixed-Income Securities
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	4	2
Level 3 \| Pension Benefits \| Alternatives
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	206	160
Level 3 \| Pension Benefits \| Insurance Contract
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	26	36
Level 3 \| Other Postretirement Benefits \| Deposit Administration Fund
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	$ 57	$ 58

Defined Benefit Plan Assets Measured at Fair Value Using Unobservable Inputs (Level Three) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of year	$ 256	$ 249
Actual return on plan assets, Sold during the year	15
Actual return on plan assets, Held at year end	7	(47)
Purchases, sales, issuances and settlements (net)	15	54
Balance at end of year	$ 293	$ 256

Estimated Future Benefit Payments (Detail) $ in Millions	Dec. 31, 2013 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2014	$ 247
2015	259
2016	265
2017	271
2018	268
Years 2019 - 2023	1,435
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2014	122
2015	123
2016	126
2017	129
2018	132
Years 2019 - 2023	717
Other Postretirement-Subsidy Receipts
Defined Benefit Plan Disclosure [Line Items]
2014	6
2015	7
2016	7
2017	8
2018	9
Years 2019 - 2023	$ 53

Multi-Employer Plans (Detail) - Multiemployer Plans, Pension - IAM National Pension Plan - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Multiemployer Plans [Line Items]

EIN/ Pension Plan Number

51-6031295 - 002

Pension Protection Act Zone Status (2013 and 2012)

^[1]

Green

FIP/RP Status Pending/Implemented

United's Contributions

$ 351

Surcharge Imposed

Multiemployer Plans [Line Items]

United's Contributions

$ 38

$ 36

$ 34

[1]	Plans in the green zone are at least 80 percent funded.

Multi-Employer Plans (Parenthetical) (Detail)	Dec. 31, 2013
IAM National Pension Plan \| Minimum \| Multiemployer Plans, Pension
Multiemployer Plans [Line Items]
Green zone funded percentage	80.00%

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Dec. 31, 2013	Dec. 31, 2012
Convertible Debt Derivative Asset \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt derivative asset	$ 480	$ 268
Convertible Debt Option Liability \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt option liability	(270)	(128)
Fair Value, Measurements, Recurring \| Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	3,220	4,770
Fair Value, Measurements, Recurring \| Cash and Cash Equivalents \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	3,214	4,765
Fair Value, Measurements, Recurring \| Auction Rate Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	105	116
Fair Value, Measurements, Recurring \| Auction Rate Securities \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	105	116
Fair Value, Measurements, Recurring \| CDARS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	301	367
Fair Value, Measurements, Recurring \| CDARS \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	301	367
Fair Value, Measurements, Recurring \| Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	694	715
Fair Value, Measurements, Recurring \| Asset-backed Securities \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	694	715
Fair Value, Measurements, Recurring \| Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	685	537
Fair Value, Measurements, Recurring \| Corporate Debt \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	685	537
Fair Value, Measurements, Recurring \| U.S. Government And Agency Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	38	12
Fair Value, Measurements, Recurring \| U.S. Government And Agency Notes \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	38	12
Fair Value, Measurements, Recurring \| Other Fixed Income Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	78	26
Fair Value, Measurements, Recurring \| Other Fixed Income Securities \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	78	26
Fair Value, Measurements, Recurring \| Fuel Derivatives, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, net	104	46
Fair Value, Measurements, Recurring \| Fuel Derivatives, Net \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, net	104	46
Fair Value, Measurements, Recurring \| Foreign Currency Derivatives, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, net	1
Fair Value, Measurements, Recurring \| Foreign Currency Derivatives, Net \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, net	1
Fair Value, Measurements, Recurring \| Restricted Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	395	447
Fair Value, Measurements, Recurring \| Restricted Cash \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	395	447
Fair Value, Measurements, Recurring \| Convertible Debt Derivative Asset \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt derivative asset	480	268
Fair Value, Measurements, Recurring \| Convertible Debt Option Liability \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt option liability	(270)	(128)
Fair Value, Measurements, Recurring \| EETC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
EETC	61	63
Fair Value, Measurements, Recurring \| EETC \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
EETC	61	63
Fair Value, Measurements, Recurring \| Level 1 \| Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	3,220	4,770
Fair Value, Measurements, Recurring \| Level 1 \| Cash and Cash Equivalents \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	3,214	4,765
Fair Value, Measurements, Recurring \| Level 1 \| Restricted Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	395	447
Fair Value, Measurements, Recurring \| Level 1 \| Restricted Cash \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	395	447
Fair Value, Measurements, Recurring \| Level 2 \| CDARS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	301	367
Fair Value, Measurements, Recurring \| Level 2 \| CDARS \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	301	367
Fair Value, Measurements, Recurring \| Level 2 \| Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	694	715
Fair Value, Measurements, Recurring \| Level 2 \| Asset-backed Securities \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	694	715
Fair Value, Measurements, Recurring \| Level 2 \| Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	685	537
Fair Value, Measurements, Recurring \| Level 2 \| Corporate Debt \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	685	537
Fair Value, Measurements, Recurring \| Level 2 \| U.S. Government And Agency Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	38	12
Fair Value, Measurements, Recurring \| Level 2 \| U.S. Government And Agency Notes \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	38	12
Fair Value, Measurements, Recurring \| Level 2 \| Other Fixed Income Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	78	26
Fair Value, Measurements, Recurring \| Level 2 \| Other Fixed Income Securities \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	78	26
Fair Value, Measurements, Recurring \| Level 2 \| Fuel Derivatives, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, net	104	46
Fair Value, Measurements, Recurring \| Level 2 \| Fuel Derivatives, Net \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, net	104	46
Fair Value, Measurements, Recurring \| Level 2 \| Foreign Currency Derivatives, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, net	1
Fair Value, Measurements, Recurring \| Level 2 \| Foreign Currency Derivatives, Net \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, net	1
Fair Value, Measurements, Recurring \| Level 3 \| Auction Rate Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	105	116
Fair Value, Measurements, Recurring \| Level 3 \| Auction Rate Securities \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	105	116
Fair Value, Measurements, Recurring \| Level 3 \| Convertible Debt Derivative Asset \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt derivative asset	480	268
Fair Value, Measurements, Recurring \| Level 3 \| Convertible Debt Option Liability \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt option liability	(270)	(128)
Fair Value, Measurements, Recurring \| Level 3 \| EETC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
EETC	61	63
Fair Value, Measurements, Recurring \| Level 3 \| EETC \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
EETC	$ 61	$ 63

Fair Value Measurements - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013
Asset-backed Securities \| Minimum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	1 year
Asset-backed Securities \| Maximum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	41 years
Corporate Debt \| Minimum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	1 year
Corporate Debt \| Maximum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	22 years
Auction Rate Securities \| Minimum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	19 years
Auction Rate Securities \| Maximum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	33 years
CDARS \| Maximum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	1 year
U.S. Government and Other Securities
Fair Value [Line Items]
Available-for-sale securities remaining maturities	5 years
U.S. Government and Other Securities \| Minimum
Fair Value [Line Items]
Available-for-sale securities remaining maturities	1 year
EETC \| Maximum
Fair Value [Line Items]
Available-for-sale securities maturity, year	2019
6% convertible junior subordinated debentures due 2030
Fair Value [Line Items]
Debt instrument convertible stated interest rate	6.00%
Debt instrument maturity year	2030
4.5% Convertible Notes Due 2015
Fair Value [Line Items]
Debt instrument convertible stated interest rate	4.50%
Debt instrument maturity year	2015

Activity for "Level Three" Financial Assets and Financial Liabilities (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Ual And United \| Auction Rate Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 116	$ 113
Purchases, (sales), issuances and settlements (net)	(19)
Realized	3
Unrealized	1	1
Reported in other comprehensive income (loss)	4	2
Ending Balance	105	116
Ual And United \| EETC
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	63	60
Purchases, (sales), issuances and settlements (net)	(4)	(5)
Reported in other comprehensive income (loss)	2	8
Ending Balance	61	63
United Airlines, Inc. \| Convertible Debt Derivative Asset
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	268	193
Unrealized	212	75
Ending Balance	480	268
United Airlines, Inc. \| Convertible Debt Option Liability
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	(128)	(95)
Purchases, (sales), issuances and settlements (net)
Realized
Unrealized	(142)	(33)
Reported in other comprehensive income (loss)
Ending Balance	$ (270)	$ (128)

Carrying Values and Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 11,708
Carrying (Reported) Amount, Fair Value Disclosure
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	11,539	$ 12,252
Estimate of Fair Value, Fair Value Disclosure
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	12,695	13,419
Estimate of Fair Value, Fair Value Disclosure \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	8,829	8,045
Estimate of Fair Value, Fair Value Disclosure \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	3,866	5,374
United Airlines, Inc.
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	11,604
United Airlines, Inc. \| Carrying (Reported) Amount, Fair Value Disclosure
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	11,388	11,850
United Airlines, Inc. \| Estimate of Fair Value, Fair Value Disclosure
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	12,249	12,460
United Airlines, Inc. \| Estimate of Fair Value, Fair Value Disclosure \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	8,383	7,086
United Airlines, Inc. \| Estimate of Fair Value, Fair Value Disclosure \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 3,866	$ 5,374

Quantitative Information about Level 3 Fair Value Measurements (Detail)
$ in Millions

12 Months Ended

Dec. 31, 2013

USD ($)

Auction Rate Securities

Level 3 Financial Instruments, asset

$ 105

Valuation Service / Broker Quotes

Broker quotes

^[1]

EETC

Level 3 Financial Instruments, asset

$ 61

Discounted Cash Flows

EETC | Structure Credit Risk

Structure credit risk

^[2]

Level 3 fair value measurements, weighted average percentage

4.00%

EETC | Structure Credit Risk | Minimum

Level 3 fair value measurements, percentage

4.00%

EETC | Structure Credit Risk | Maximum

Level 3 fair value measurements, percentage

5.00%

Convertible Debt Derivative Asset

Level 3 Financial Instruments, asset

$ 480

Binomial Lattice Model

Convertible Debt Derivative Asset | Expected Volatility

Expected volatility Own credit risk

^[3],[4]

Level 3 fair value measurements, weighted average volatility percentage

46.00%

Convertible Debt Derivative Asset | Expected Volatility | Minimum

Level 3 fair value measurements, expected volatility percentage

45.00%

Convertible Debt Derivative Asset | Expected Volatility | Maximum

Level 3 fair value measurements, expected volatility percentage

60.00%

Convertible Debt Derivative Asset | Own Credit Risk

Level 3 fair value measurements, credit risk percentage

5.00%

Convertible Debt Option Liability

Level 3 Financial Instruments, liability

$ (270)

Binomial Lattice Model

Convertible Debt Option Liability | Expected Volatility

Expected volatility Own credit risk

^[3],[4]

Level 3 fair value measurements, weighted average volatility percentage

47.00%

Convertible Debt Option Liability | Expected Volatility | Minimum

Level 3 fair value measurements, expected volatility percentage

45.00%

Convertible Debt Option Liability | Expected Volatility | Maximum

Level 3 fair value measurements, expected volatility percentage

60.00%

Convertible Debt Option Liability | Own Credit Risk

Level 3 fair value measurements, credit risk percentage

5.00%

[1]	Broker quotes obtained by a third-party valuation service.
[2]	Represents the credit risk premium of the EETC structure above the risk-free rate that the Company has determined market participants would use in pricing the instruments.
[3]	Represents the range in volatility estimates that the Company has determined market participants would use when pricing the instruments.
[4]	Represents the range of Company-specific risk adjustments that the Company has determined market participants would use as a model input.

Hedging Activities - Additional Information (Detail) gal in Millions	Dec. 31, 2013 gal
2014 Projected
Derivatives And Hedging Activities [Line Items]
Percentage of projected fuel requirements	24.00%
Volume of fuel hedging	951
2015 Projected
Derivatives And Hedging Activities [Line Items]
Percentage of projected fuel requirements	8.00%
Volume of fuel hedging	309

Description of Derivative Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Fuel contracts, assets	$ 104	$ 51
Fuel contracts, liabilities		5
Receivables
Derivatives, Fair Value [Line Items]
Fuel contracts, assets	89	51
Other Assets
Derivatives, Fair Value [Line Items]
Fuel contracts, assets	15
Current liabilities: Other
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities		4
Other liabilities and deferred credits: Other
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities		1
Hedge Derivatives, Net \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Fuel contracts, assets	25	7
Hedge Derivatives, Net \| Cash Flow Hedging \| Receivables
Derivatives, Fair Value [Line Items]
Fuel contracts, assets	19	7
Hedge Derivatives, Net \| Cash Flow Hedging \| Other Assets
Derivatives, Fair Value [Line Items]
Fuel contracts, assets	6
Hedge Derivatives, Net \| Cash Flow Hedging \| Current liabilities: Other
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities		2
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Fuel contracts, assets	79	44
Fuel contracts, liabilities		3
Not Designated as Hedging Instrument \| Receivables
Derivatives, Fair Value [Line Items]
Fuel contracts, assets	70	44
Not Designated as Hedging Instrument \| Other Assets
Derivatives, Fair Value [Line Items]
Fuel contracts, assets	$ 9
Not Designated as Hedging Instrument \| Current liabilities: Other
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities		2
Not Designated as Hedging Instrument \| Other liabilities and deferred credits: Other
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities		$ 1

Offsetting Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2013	Dec. 31, 2012
Offsetting Asset and Liabilities [Line Items]
Potential net fair value positions elected to offset	$ 104	$ 46
Receivables
Offsetting Asset and Liabilities [Line Items]
Potential net fair value positions elected to offset	89	$ 46
Other Assets
Offsetting Asset and Liabilities [Line Items]
Potential net fair value positions elected to offset	$ 15

Schedule of Gains (Losses) on Derivative Instruments (Detail) - Hedge Derivatives, Net - Cash Flow Hedging - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ 39	$ (51)
Gain (Loss) Reclassified from AOCI into Income (Fuel Expense) (Effective Portion)	18	(141)
Amount of Gain (Loss) Recognized in Nonoperating Expense (Ineffective Portion)	$ 5	$ (1)

Schedule of Derivative Instruments not Designated as Hedges Gains (Losses) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain Recognized in Nonoperating income (expense): Miscellaneous, net	$ 79	$ 38

Schedule of Derivative Credit Risk and Fair Value (Detail) - USD ($) $ in Millions	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Net derivative assets with counterparties	$ 104	$ 46
Collateral held by the Company (classified as an other current liability)
Potential loss related to the failure of the Company's counterparties to perform	$ 104	$ 46

Debt (Detail) - USD ($)
$ in Millions

Dec. 31, 2013

Dec. 31, 2012

Aug. 31, 2010

Less: current portion of long-term debt-United

$ (1,368)

$ (1,812)

10,171

10,440

Less: unamortized debt discount

11,604

12,059

(169)

(152)

Less: current portion of long-term debt-United

(1,368)

(1,812)

6% convertible senior notes due 2029

10,020

10,038

Secured Debt | Notes payable, fixed interest rates of 4.00% to 12.00% (weighted average rate of 6.50% as of December 31, 2013), payable through 2025 | United Airlines, Inc.

104

345

Secured Debt | Notes payable, floating interest rates of the London Interbank Offered Rate ("LIBOR") plus 0.20% to 5.46%, payable through 2025 | United Airlines, Inc.

6,279

5,943

Secured Debt | Term Loan | United Airlines, Inc.

1,243

1,668

Secured Debt | Amended credit facility, LIBOR plus 2.0%, due 2014 | United Airlines, Inc.

893

Secured Debt | 6.75% senior secured notes due 2015 | United Airlines, Inc.

1,201

Secured Debt | 9.875% senior secured notes and 12% second lien due 2013 | United Airlines, Inc.

800

$ 800

Unsecured Debt | UAL 4.5% Senior Limited-Subordination Convertible Notes Due 2021 | United Airlines, Inc.

600

Unsecured Debt | United Air Lines Six Percent Senior Notes Due Twenty Twenty Six to Twenty Twenty Eight | United Airlines, Inc.

156

Unsecured Debt | Senior Notes 6% Due 2020 | United Airlines, Inc.

652

Unsecured Debt | 6% convertible junior subordinated debentures due 2030 | United Airlines, Inc.

300

Unsecured Debt | Senior Notes 6.375 Percent Due 2018 | United Airlines, Inc.

248

Unsecured Debt | 8% notes due 2024 | United Airlines, Inc.

300

Unsecured Debt | 4.5% convertible notes due 2015 | United Airlines, Inc.

400

Unsecured Debt | Other Debt | United Airlines, Inc.

230

Adjusted For Embedded Conversion Options | United Airlines, Inc.

103

161

^[1]

$ 10,067

$ 10,095

[1]

As further described below under "Convertible Debt Securities and Derivatives," there is a basis difference between UAL and United debt values, because we were required to apply different accounting methodologies. The United debt presented above does not agree to United's balance sheet by the amount of this adjustment.

Debt (Parenthetical) (Detail)	12 Months Ended
Debt (Parenthetical) (Detail)	Dec. 31, 2013	Dec. 31, 2012	Nov. 30, 2013	Jun. 30, 2013	May 31, 2013	Jun. 30, 2011	Aug. 31, 2010
Interest Rate Floor
Debt Instrument [Line Items]
Debt instrument stated interest rate				1.00%
Unsecured Debt
Debt Instrument [Line Items]
Debt instrument stated interest rate			6.00%
6.75% senior secured notes due 2015
Debt Instrument [Line Items]
Debt instrument stated interest rate	6.75%
Senior Notes 6% Due 2020
Debt Instrument [Line Items]
Debt instrument stated interest rate	6.00%
6% convertible junior subordinated debentures due 2030
Debt Instrument [Line Items]
Debt instrument stated interest rate	6.00%
Debt instrument, maturity date	2030
Senior Notes 6.375 Percent Due 2018
Debt Instrument [Line Items]
Debt instrument stated interest rate	6.375%
Senior Notes 6.375 Percent Due 2018 \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument stated interest rate					6.375%
6% convertible senior notes due 2029
Debt Instrument [Line Items]
Debt instrument stated interest rate	6.00%	6.00%
Debt instrument, maturity date	2029	2029
United Airlines, Inc. \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument stated interest rate						4.50%
United Airlines, Inc. \| Notes payable, fixed interest rates of 4.00% to 12.00% (weighted average rate of 6.50% as of December 31, 2013), payable through 2025 \| Secured Debt
Debt Instrument [Line Items]
Debt instrument stated interest rate, minimum	4.00%	4.00%
Debt instrument stated interest rate, maximum	12.00%	12.00%
Weighted average interest rate	6.50%
Debt instrument, maturity date	2025	2025
United Airlines, Inc. \| Notes payable, floating interest rates of the London Interbank Offered Rate ("LIBOR") plus 0.20% to 5.46%, payable through 2025 \| Secured Debt
Debt Instrument [Line Items]
Debt instrument, maturity date	2025	2025
United Airlines, Inc. \| Notes payable, floating interest rates of the London Interbank Offered Rate ("LIBOR") plus 0.20% to 5.46%, payable through 2025 \| Minimum \| Secured Debt
Debt Instrument [Line Items]
Debt instrument stated interest rate	0.20%	0.20%
United Airlines, Inc. \| Notes payable, floating interest rates of the London Interbank Offered Rate ("LIBOR") plus 0.20% to 5.46%, payable through 2025 \| Maximum \| Secured Debt
Debt Instrument [Line Items]
Debt instrument stated interest rate	5.46%	5.46%
United Airlines, Inc. \| Term Loan \| Secured Debt
Debt Instrument [Line Items]
Debt instrument, maturity date	2019
United Airlines, Inc. \| Term Loan \| Secured Debt \| Interest Rate Floor
Debt Instrument [Line Items]
Debt instrument stated interest rate	1.00%
United Airlines, Inc. \| Term Loan \| Secured Debt \| Libor Plus
Debt Instrument [Line Items]
Debt instrument stated interest rate	3.00%
United Airlines, Inc. \| Term Loan \| Secured Debt \| Certain Market Interest Rates
Debt Instrument [Line Items]
Debt instrument stated interest rate	2.00%
United Airlines, Inc. \| Amended credit facility, LIBOR plus 2.0%, due 2014 \| Secured Debt
Debt Instrument [Line Items]
Debt instrument stated interest rate	2.00%	2.00%
Debt instrument, maturity date	2014	2014
United Airlines, Inc. \| 6.75% senior secured notes due 2015 \| Secured Debt
Debt Instrument [Line Items]
Debt instrument stated interest rate	6.75%	6.75%					6.75%
Debt instrument, maturity date	2015	2015					2015
United Airlines, Inc. \| 9.875% Senior Notes Due 2013 \| Secured Debt
Debt Instrument [Line Items]
Debt instrument stated interest rate	9.875%	9.875%
Debt instrument, maturity date	2013	2013
United Airlines, Inc. \| 12% Second Lien Due 2013 \| Secured Debt
Debt Instrument [Line Items]
Debt instrument stated interest rate	12.00%	12.00%
United Airlines, Inc. \| UAL 4.5% Senior Limited-Subordination Convertible Notes Due 2021 \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument stated interest rate	4.50%	4.50%
Debt instrument, maturity date	2021	2021
United Airlines, Inc. \| United Air Lines Six Percent Senior Notes Due Twenty Twenty Six to Twenty Twenty Eight \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument stated interest rate	6.00%	6.00%
United Airlines, Inc. \| United Air Lines Six Percent Senior Notes Due Twenty Twenty Six to Twenty Twenty Eight \| Minimum \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, maturity date	2026	2026
United Airlines, Inc. \| United Air Lines Six Percent Senior Notes Due Twenty Twenty Six to Twenty Twenty Eight \| Maximum \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, maturity date	2028	2028
United Airlines, Inc. \| Senior Notes 6% Due 2020 \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument stated interest rate	6.00%	6.00%
Debt instrument, maturity date	2020	2020
United Airlines, Inc. \| 6% convertible junior subordinated debentures due 2030 \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument stated interest rate	6.00%	6.00%
Debt instrument, maturity date	2030	2030
United Airlines, Inc. \| Senior Notes 6.375 Percent Due 2018 \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument stated interest rate	6.375%	6.375%
Debt instrument, maturity date	2018	2018
United Airlines, Inc. \| 8% notes due 2024 \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument stated interest rate	8.00%	8.00%
Debt instrument, maturity date	2024	2024
United Airlines, Inc. \| 4.5% convertible notes due 2015 \| Unsecured Debt
Debt Instrument [Line Items]
Debt instrument stated interest rate	4.50%	4.50%
Debt instrument, maturity date	2015	2015

Contractual Principal Payments (Detail) $ in Millions	Dec. 31, 2013 USD ($)
Debt Instrument [Line Items]
2014	$ 1,368
2015	2,072
2016	1,051
2017	614
2018	1,135
After 2018	5,468
Long term debt	11,708
United Airlines, Inc.
Debt Instrument [Line Items]
2014	1,368
2015	2,072
2016	1,051
2017	614
2018	1,135
After 2018	5,364
Long term debt	$ 11,604

Debt - Additional Information (Detail)

1 Months Ended

2 Months Ended

6 Months Ended

12 Months Ended

Feb. 20, 2014

USD ($)

Nov. 30, 2013

USD ($)

May 31, 2013

USD ($)

Mar. 27, 2013

USD ($)

Jun. 30, 2011

USD ($)

$ / shares

Feb. 20, 2014

USD ($)

Jun. 30, 2013

Dec. 31, 2013

USD ($)

$ / shares

Jan. 17, 2014

USD ($)

Dec. 31, 2012

USD ($)

Aug. 31, 2010

USD ($)

Quarterly principal repayment amount

0.25%

Commencement date of installment payment

Jun. 30, 2013

Debt instrument, maturity date

Apr. 01, 2019

Commitment fee percentage

0.75%

Long term debt

$ 11,708,000,000

$ 10,171,000,000

$ 10,440,000,000

Term Loan Facility

Amount utilized to repay term loan

Apr. 01, 2019

Credit Agreement

$ 900,000,000

900,000,000

Amended Credit Facility

$ 1,200,000,000

Cash utilized to repay term loan

2014

$ 300,000,000

Performance Bonds

Credit facility expiration year

2018

Revolving Credit Facility

Available under revolving credit facility

Apr. 01, 2018

Credit Agreement

$ 1,000,000,000

$ 1,000,000,000

Interest Rate Floor

1.00%

Unsecured Debt

$ 300,000,000

Dec. 01, 2020

6.00%

LIBOR

Debt instrument, basis spread on variable rate

3.00%

Certain Market Interest Rates

Debt instrument, basis spread on variable rate

2.00%

Senior Notes 6.375 Percent Due 2018

Senior Notes 6.375 Percent Due 2018 | Unsecured Debt

6.375%

$ 300,000,000

Jun. 01, 2018

Debt instrument redemption percentage

6.375%

101.00%

6% convertible senior notes due 2029

Debt instrument convertible effective interest rate

6.00%

6.00%

2029

$ 8.69

6% convertible senior notes due 2029 | Debtor Optional Redemption Period

$ 104,000,000

$ 345,000,000

6% convertible senior notes due 2029 | Holder Optional Redemption Period 1

Oct. 15, 2014

6% convertible senior notes due 2029 | Holder Optional Redemption Period 2

Oct. 15, 2014

6% convertible senior notes due 2029 | Holder Optional Redemption Period 3

Oct. 15, 2019

6.75% senior secured notes due 2015

Oct. 15, 2024

6% Convertible Senior Notes

6.75%

Debt instrument convertible effective interest rate

6.00%

Common stock issued in exchange for convertible notes | shares

2029

28,000,000

Aggregate principal amount of convertible senior notes exchanged

$ 240,000,000

6% Convertible Senior Notes | Subsequent Event

104,000,000

Common stock issued in exchange for convertible notes | shares

3,582,640

Aggregate principal amount of convertible senior notes exchanged

$ 31,126,000

8% notes due 2024 | Subsequent Event

Aggregate principal amount of debt redeemed

$ 400,000,000

Preferred securities liquidation value

11,604,000,000

12,059,000,000

Long term debt

11,604,000,000

248,000,000

Difference in long term debt noncurrent

10,020,000,000

10,038,000,000

47,000,000

57,000,000

United Airlines, Inc. | Letter of Credit

Credit facility outstanding amount

61,000,000

United Airlines, Inc. | Letter of Credit and Performance Bonds

Credit facility outstanding amount

398,000,000

United Airlines, Inc. | Convertible Debt Derivative Asset

Convertible debt derivative asset

480,000,000

268,000,000

United Airlines, Inc. | Convertible Debt Option Liability

Convertible debt option liability

270,000,000

128,000,000

United Airlines, Inc. | Unsecured Debt

$ 726,000,000

4.50%

United Airlines, Inc. | Adjusted For Embedded Conversion Options

$ 32.64

Repurchased debt

$ 570,000,000

United Airlines, Inc. | Subsequent Event | Unsecured Debt

^[1]

$ 10,067,000,000

$ 10,095,000,000

4.50%

Debt instrument converted amount

2021

$ 156,000,000

Debt instrument conversion rate

30.6419

Debt instrument converted shares issued | shares

5,000,000

United Airlines, Inc. | Senior Notes 6.375 Percent Due 2018 | Unsecured Debt

6.375%

2018

United Airlines, Inc. | 6% convertible junior subordinated debentures due 2030 | Unsecured Debt

$ 300,000,000

$ 248,000,000

Debt instrument convertible effective interest rate

Nov. 15, 2030

6.00%

Convertible preferred securities, outstanding | shares

5,000,000

Liquidation value per preferred security | $ / shares

$ 50

United Airlines, Inc. | 6% convertible junior subordinated debentures due 2030 | Unsecured Debt | Convertible Common Stock

United Airlines, Inc. | 6% convertible junior subordinated debentures due 2030 | Unsecured Debt | Convertible Preferred Stock

57.14

United Airlines, Inc. | 6.75% senior secured notes due 2015 | Secured Debt

$ 0.875

6.75%

2015

United Airlines, Inc. | 8% notes due 2024 | Unsecured Debt

$ 800,000,000

8.00%

2024

United Airlines, Inc. | Pass Through Certificates

$ 400,000,000

United Airlines, Inc. | 4.5% convertible notes due 2015 | Unsecured Debt

Long term debt

$ 6,000,000,000

Debt instrument convertible effective interest rate

4.50%

United Airlines, Inc. | United Five Percentage Convertible Notes | Unsecured Debt

$ 18.93

Debt instrument convertible effective interest rate

5.00%

Present value of minimum lease payments

2023

[1]

Details of Pass Through Trusts (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Proceeds received from issuance of debt	$ 1,423	$ 1,121	$ 152
United Airlines, Inc.
Debt Instrument [Line Items]
Total debt recorded	11,604	12,059
Proceeds received from issuance of debt	1,423	$ 1,121	$ 152
United Airlines, Inc. \| Class A Pass Through Certificates \| August 2013
Debt Instrument [Line Items]
Principal	$ 720
Final expected distribution date	2025-08
Stated interest rate	4.30%
Total debt recorded	$ 153
Proceeds received from issuance of debt	153
Remaining proceeds from issuance of debt to be received in future periods	567
United Airlines, Inc. \| Class A Pass Through Certificates \| October 2012
Debt Instrument [Line Items]
Principal	$ 712
Final expected distribution date	2024-10
Stated interest rate	4.00%
Total debt recorded	$ 712
Proceeds received from issuance of debt	465
United Airlines, Inc. \| Class B Pass Through Certificates \| August 2013
Debt Instrument [Line Items]
Principal	$ 209
Final expected distribution date	2021-08
Stated interest rate	5.375%
Total debt recorded	$ 44
Proceeds received from issuance of debt	44
Remaining proceeds from issuance of debt to be received in future periods	165
United Airlines, Inc. \| Class B Pass Through Certificates \| October 2012
Debt Instrument [Line Items]
Principal	$ 132
Final expected distribution date	2020-10
Stated interest rate	5.50%
Total debt recorded	$ 132
Proceeds received from issuance of debt	86
United Airlines, Inc. \| Class C Pass Through Certificates \| December 2012
Debt Instrument [Line Items]
Principal	$ 425
Final expected distribution date	2018-04
Stated interest rate	6.125%
Total debt recorded	$ 425
Proceeds received from issuance of debt	147
United Airlines, Inc. \| EETC
Debt Instrument [Line Items]
Principal	2,198
Total debt recorded	1,466
Proceeds received from issuance of debt	895
Remaining proceeds from issuance of debt to be received in future periods	$ 732

Summary of Collateral Covenants and Cross Default Provisions (Detail)	12 Months Ended
	Dec. 31, 2013
Credit Agreement
Debt Instrument [Line Items]
Collateral, Covenants and Cross Default Provisions	Secured by certain of United's international route authorities, specified take-off and landing slots at certain airports and certain other assets. The Credit Agreement requires the Company to maintain at least $3.0 billion of unrestricted liquidity at all times, which includes unrestricted cash, short-term investments and any undrawn amounts under any revolving credit facility and to maintain a minimum ratio of appraised value of collateral to the outstanding obligations under the Credit Agreement of 1.67 to 1.0 at all times. The Credit Agreement contains covenants that, among other things, restrict the ability of UAL and its restricted subsidiaries (as defined in the Credit Agreement) to incur additional indebtedness and to pay dividends on or repurchase stock. The Credit Agreement contains events of default customary for this type of financing, including a cross default and cross acceleration provision to certain other material indebtedness of the Company.
United Air Lines 6% Notes Due 2026
Debt Instrument [Line Items]
Collateral, Covenants and Cross Default Provisions	The amended and restated indenture for these notes, which are unsecured, contains covenants that, among other things, restrict the ability of the Company and its restricted subsidiaries (as defined in the indenture) to incur additional indebtedness and pay dividends on or repurchase stock.
United Air Lines 6% Notes Due 2028
Debt Instrument [Line Items]
Collateral, Covenants and Cross Default Provisions	These covenants cease to be in effect when the indenture covering the 6.375% Senior Notes due 2018 is discharged. The indenture contains events of default that are customary for similar financings.
Senior Notes 6.375 Percent Due 2018
Debt Instrument [Line Items]
Collateral, Covenants and Cross Default Provisions	The indentures for these notes, which are unsecured, contain covenants that, among other things, restrict the ability of the Company and its restricted subsidiaries (as defined in the indenture) to incur additional indebtedness and pay dividends on or repurchase stock.
Senior Notes 6% Due 2020
Debt Instrument [Line Items]
Collateral, Covenants and Cross Default Provisions	The indentures contain events of default that are customary for similar financings.
6.75% senior secured notes due 2015
Debt Instrument [Line Items]
Collateral, Covenants and Cross Default Provisions	Secured by certain of United's U.S.-Asia and U.S.-London Heathrow routes and related assets, all of the outstanding common stock and other assets of Air Micronesia, Inc. ("AMI") and Continental Micronesia, Inc. ("CMI") and substantially all of the other assets of AMI and CMI, including route authorities and related assets. The indenture for these notes includes covenants that, among other things, restrict United's ability to sell assets, incur additional indebtedness, issue preferred stock, make investments and pay dividends on or repurchase stock. In addition, if United fails to maintain a collateral coverage ratio of 1.5 to 1.0, United must pay additional interest on the Senior Notes at the rate of 2% per annum until the collateral coverage ratio equals at least 1.5 to 1.0. The indenture for these notes also includes events of default customary for similar financings and a cross default provision if United fails to make payment when due with respect to certain obligations regarding frequent flyer miles purchased by Chase under United's Co-Brand Agreement.

Summary of Collateral Covenants and Cross Default Provisions (Parenthetical) (Detail) $ in Billions	12 Months Ended
	Dec. 31, 2013 USD ($)
Credit Agreement
Debt Instrument [Line Items]
Unrestricted liquidity required for credit agreement	$ 3
Minimum ratio of appraised value of collateral for Credit Agreement	1.67
United Air Lines 6% Notes Due 2026
Debt Instrument [Line Items]
Debt instrument stated interest rate	6.00%
Debt instrument maturity year	2026
United Air Lines 6% Notes Due 2028
Debt Instrument [Line Items]
Debt instrument stated interest rate	6.00%
Debt instrument maturity year	2028
Senior Notes 6.375 Percent Due 2018
Debt Instrument [Line Items]
Debt instrument stated interest rate	6.375%
Debt instrument maturity year	2018
Senior Notes 6% Due 2020
Debt Instrument [Line Items]
Debt instrument stated interest rate	6.00%
Debt instrument maturity year	2020
6.75% senior secured notes due 2015
Debt Instrument [Line Items]
Debt instrument stated interest rate	6.75%
Debt instrument maturity year	2015
Debt covenant required collateral coverage ratio	1.5
Additional interest paid if non-compliant on collateral coverage ratio	2.00%

Advanced Purchase of Miles - Additional Information (Detail) - United Airlines, Inc. - Co-Brand Agreement $ in Millions	Dec. 31, 2013 USD ($)
6.75% senior secured notes due 2015
Airline Products and Services [Line Items]
Debt instrument maturity year	2015
Maximum
Airline Products and Services [Line Items]
Secured obligations	$ 850
Maximum \| Advanced Purchase of Miles
Airline Products and Services [Line Items]
Repurchase of pre-purchased miles from Chase in 2014	199
Repurchase of pre-purchased miles from Chase in 2015	224
Repurchase of pre-purchased miles from Chase in 2016	$ 249

Future Minimum Lease Payments for Capital and Operating Leases (Detail) - USD ($)
$ in Millions

Dec. 31, 2013

Dec. 31, 2012

Capital Leases

2014

^[1]

$ 206

2015

^[1]

183

2016

^[1]

168

2017

^[1]

123

2018

^[1]

106

After 2018

^[1]

678

Minimum lease payments

^[1]

1,464

Imputed interest

^[1]

(594)

^[1]

870

Current portion

(117)

^[1]

$ (122)

Long-term obligations under capital leases

753

^[1]

$ 792

Facility And Other Operating Leases

1,192

987

864

831

710

6,002

Minimum lease payments

10,586

Aircraft Operating Leases

Operating Leases

2014

^[2]

1,601

2015

^[2]

1,381

2016

^[2]

1,150

2017

^[2]

1,053

2018

^[2]

786

After 2018

^[2]

1,819

Minimum lease payments

^[2]

$ 7,790

[1]	As of December 31, 2013, United's aircraft capital lease minimum payments relate to leases of 47 mainline and 38 regional aircraft as well as to leases of nonaircraft assets. Imputed interest rate ranges are 4.8% to 18.5%.
[2]	The operating lease payments presented above include future payments of $103 million related to 25 nonoperating aircraft as of December 31, 2013.

Future Minimum Lease Payments for Capital and Operating Leases (Parenthetical) (Detail) - United Airlines, Inc. $ in Millions	12 Months Ended
	Dec. 31, 2013 USD ($) Aircraft
Minimum
Capital Leases And Operating Leases [Line Items]
Imputed interest rate	4.80%
Maximum
Capital Leases And Operating Leases [Line Items]
Imputed interest rate	18.50%
Mainline
Capital Leases And Operating Leases [Line Items]
Number of assets subject to lease	47
Regional Carrier
Capital Leases And Operating Leases [Line Items]
Number of assets subject to lease	38
Nonoperating Aircraft
Capital Leases And Operating Leases [Line Items]
Number of assets subject to lease	25
Operating lease future payments \| $	$ 103

Leases and Capacity Purchase Agreements - Additional Information (Detail)
$ in Millions

1 Months Ended

12 Months Ended

Nov. 30, 2013

USD ($)

May 31, 2013

Aircraft

Seat

Apr. 30, 2013

USD ($)

Aircraft

Dec. 31, 2013

USD ($)

Aircraft

Dec. 31, 2012

USD ($)

Aircraft

Dec. 31, 2011

USD ($)

Regional capacity purchase expense

$ 2,419

$ 2,470

$ 2,403

Number of regional aircraft | Aircraft

133

Minimum

Projected inflation rate

1.38%

Maximum

10% increase or decrease in scheduled block hours | Capacity Purchase Agreements

Projected inflation rate

2.50%

Scheduled block hours increase (decrease) percentage

10.00%

Change in cash obligation

$ 159

Cash obligation increase (decrease) percentage

8.20%

Operating lease expiration date, in years

2033

Additional investment commitments

$ 150

Nonaircraft rent expense

$ 1,300

1,300

Regional capacity purchase expense

2,419

2,470

2,403

United Airlines, Inc. | Variable Interest Entity, Not Primary Beneficiary

Operating leases obligations

$ 1,600

United Airlines, Inc. | Capacity Purchase Agreements

Number of regional aircraft | Aircraft

572

Airline capacity purchase arrangements, expiration year

2027

Number of aircraft purchase | Aircraft

United Airlines, Inc. | Regional Aircraft

Regional capacity purchase expense

$ 428

463

498

United Airlines, Inc. | Revaluation of Liabilities

United Airlines, Inc. | Minimum

Net accretion amounts

$ 173

$ 240

$ 227

Lease Fair Value Adjustment, Remaining Lease Term

1 year

United Airlines, Inc. | Maximum

Lease Fair Value Adjustment, Remaining Lease Term

11 years

Sky West Incorporation | Capacity Purchase Agreements

Number of regional aircraft | Aircraft

Number of seats in the aircraft | Seat

Aircraft Operating Leases

Operating lease extended expiration year

2041

Operating leases obligations

^[1]

$ 7,790

Aircraft Operating Leases | Minimum

Operating lease expiration date, in years

Operating lease term

6 years

2014

Aircraft Operating Leases | Maximum

Operating lease expiration date, in years

Operating lease term

26 years

2024

Lease Amendment | United Airlines, Inc.

Additional investment commitments

Operating lease term

4 years

$ 450

[1]	The operating lease payments presented above include future payments of $103 million related to 25 nonoperating aircraft as of December 31, 2013.

Future Lease Payment Under Terms of Capacity Purchase Agreement (Detail) $ in Millions	Dec. 31, 2013 USD ($)
Long-term Purchase Commitment [Line Items]
2014	$ 1,936
2015	1,747
2016	1,532
2017	1,449
2018	1,340
After 2018	3,410
Contractual Obligation, Total	$ 11,414

Variable Interest Entities - Additional Information (Detail) - Variable Interest Entity, Not Primary Beneficiary	Dec. 31, 2013 Aircraft
Mainline
Variable Interest Entity [Line Items]
Aircraft under operating lease, fixed purchase options	72
Regional Carrier
Variable Interest Entity [Line Items]
Aircraft under operating lease	256

Firm Commitments to Purchase Aircraft (Detail) - United Airlines, Inc. - Capital Addition Purchase Commitments

Dec. 31, 2013

Aircraft

^[1]

Airbus A350-1000 aircraft

Boeing 737-900ER aircraft

Boeing 737 MAX 9 Aircraft

100

Boeing 787-8/-9/-10

Embraer EMB175 aircraft

[1]	United also has options and purchase rights for additional aircraft.

Commitments and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2013 USD ($) Employee Aircraft yr	Dec. 31, 2012 USD ($)
Commitments and Contingencies [Line Items]
Percentage of employees represented by various U.S. labor organizations	80.00%
Tax-exempt special facilities revenue bonds
Commitments and Contingencies [Line Items]
Guarantor obligations, maximum exposure	$ 1,900
Operating leases obligations	1,600
Capital leases obligations	267
Tax-exempt special facilities revenue bonds \| Indirect Guarantee of Indebtedness
Commitments and Contingencies [Line Items]
Guarantor obligations, maximum exposure	250
Contingent liabilities based on participation	1,200
United Airlines, Inc.
Commitments and Contingencies [Line Items]
Debt instrument principal amount	$ 11,604	$ 12,059
Number of employees \| Employee	87,000
Floating Rate Debt
Commitments and Contingencies [Line Items]
Debt instrument principal amount	$ 2,100
Fixed Rate Debt
Commitments and Contingencies [Line Items]
Debt instrument principal amount	286
Loans And Leases From Non U S Entities
Commitments and Contingencies [Line Items]
Debt instrument principal amount	$ 2,300
Capital Addition Purchase Commitments
Commitments and Contingencies [Line Items]
New aircraft, scheduled delivery date	2014-06
Capital Addition Purchase Commitments \| Boeing 737-900ER aircraft
Commitments and Contingencies [Line Items]
Number of aircraft expected to be delivered \| Aircraft	15
Capital Addition Purchase Commitments \| Boeing 787-8 aircraft
Commitments and Contingencies [Line Items]
Number of aircraft expected to be delivered \| Aircraft	2
Maximum
Commitments and Contingencies [Line Items]
New aircraft, scheduled delivery date	2025
Debt instrument, remaining terms (years) \| yr	12
Maximum \| Tax-exempt special facilities revenue bonds
Commitments and Contingencies [Line Items]
Debt instrument, maturity year	2038
Maximum \| Tax-exempt special facilities revenue bonds \| Indirect Guarantee of Indebtedness
Commitments and Contingencies [Line Items]
Debt instrument, maturity year	2041
Maximum \| Loans And Leases From Non U S Entities
Commitments and Contingencies [Line Items]
Debt instrument, remaining terms (years) \| yr	12
Minimum
Commitments and Contingencies [Line Items]
New aircraft, scheduled delivery date	2014
Minimum \| Tax-exempt special facilities revenue bonds
Commitments and Contingencies [Line Items]
Debt instrument, maturity year	2015
Minimum \| Tax-exempt special facilities revenue bonds \| Indirect Guarantee of Indebtedness
Commitments and Contingencies [Line Items]
Debt instrument, maturity year	2014

Schedule of Acquisition of Aircrafts and Related Spare Engines (Detail) $ in Billions	Dec. 31, 2013 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
2014	$ 3.0
2015	2.8
2016	2.0
2017	1.5
2018	2.1
After 2018	12.5
Total commitments	$ 23.9

Supplemental Disclosures of Cash Flow Information and Non-Cash Investing and Financing Activities (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash paid (refunded) during the period for:
Interest (net of amounts capitalized)	$ 752	$ 766	$ 855
Income taxes	(20)	2	10
Non-cash transactions:
Net property and equipment acquired through issuance of debt	229	544	130
8% Contingent Senior Unsecured Notes and 6% Senior Notes, net of discount		357	88
Special facility payment financing		101
Interest paid in kind on 6% Senior Notes			37
Airport construction financing	40	50
UAL 6% Senior Convertible Notes
Non-cash transactions:
Exchanges of certain 6% convertible senior notes for common stock	240
United Airlines, Inc.
Cash paid (refunded) during the period for:
Interest (net of amounts capitalized)	752	766	855
Income taxes	(15)	4	2
Non-cash transactions:
Net property and equipment acquired through issuance of debt	229	544	130
8% Contingent Senior Unsecured Notes and 6% Senior Notes, net of discount		357	88
Special facility payment financing		101
Interest paid in kind on 6% Senior Notes			$ 37
Airport construction financing	$ 40	$ 50

Supplemental Disclosures of Cash Flow Information and Non-Cash Investing and Financing Activities (Parenthetical) (Detail)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
UAL 6% Senior Convertible Notes
Supplemental Cash Flow Information [Line Items]
Debt instrument stated interest rate	6.00%	6.00%	6.00%
UAL 8% Contingent Senior Notes
Supplemental Cash Flow Information [Line Items]
Debt instrument stated interest rate		8.00%	8.00%
United Airlines, Inc. \| UAL 6% Senior Convertible Notes
Supplemental Cash Flow Information [Line Items]
Debt instrument stated interest rate	6.00%	6.00%	6.00%
United Airlines, Inc. \| UAL 8% Contingent Senior Notes
Supplemental Cash Flow Information [Line Items]
Debt instrument stated interest rate		8.00%	8.00%

Components of Special Charges (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Special Charges [Line Items]
Integration-related costs	$ 40	$ 50	$ 45	$ 70	$ 408	$ 60	$ 137	$ 134	$ 205	$ 739	$ 517
Labor agreement costs		127			21	$ 454			127	475
Severance and benefits	91			14			76	49	105	125
Asset impairments	33				24			6	33	30	4
Termination of maintenance service contract									(5)		58
Additional costs associated with the temporarily grounded Boeing 787 aircraft			$ 7	11					18
(Gains) losses on sale of assets and other special charges, net	$ 1	$ 34		$ (3)	$ (14)		$ (7)	$ (25)	32	(46)	13
Total									$ 520	$ 1,323	$ 592

Integration-Related Costs and Special Items - Additional Information (Detail) $ / shares in Units, $ in Millions		1 Months Ended			3 Months Ended								12 Months Ended
	Feb. 20, 2014 Departure Location Operation	Oct. 31, 2013 USD ($)	Mar. 31, 2013 Aircraft	Jun. 30, 2011 USD ($)	Dec. 31, 2013 USD ($) Employee	Sep. 30, 2013 USD ($)	Jun. 30, 2013 USD ($)	Mar. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Sep. 30, 2012 USD ($)	Jun. 30, 2012 USD ($) Attendant	Mar. 31, 2012 USD ($)	Dec. 31, 2013 USD ($) Aircraft Employee $ / shares	Dec. 31, 2012 USD ($) Aircraft	Dec. 31, 2011 USD ($)
Merger, Acquisition, Integration Costs and Other Charges [Line Items]
Debt extinguishment charge														$ 309
Fair value of liabilities extinguished														212
Labor agreement costs						$ 127			$ 21	$ 454			$ 127	475
Number of fleet service, passenger service, storekeeper and pilot workgroups \| Employee					1,200								1,200
Severance and benefits					$ 91			$ 14			$ 76	$ 49	$ 105	125
Number of mechanics offering to retire early												400
Number of flight attendants voluntarily on leave												1,800
Number of flight attendants accepted voluntary retirement \| Attendant											1,300
Intangible asset impairment													1	30
Impairment charges of equipment held for disposal													32
Temporary grounding of 787 aircraft charges							$ 7	11					18
Termination of maintenance service contract															$ 58
Adjustment of reserves for certain legal matters													29
Gain related to contract termination													5		(58)
Loss on sale of asset													3
Aircraft-related charges (gains), net					$ (1)	$ (34)		$ 3	$ 14		$ 7	$ 25	(32)	$ 46	(13)
Special revenue item				$ 107											$ 107
Number of aircraft to be sold \| Aircraft			30
Number of aircraft that the company operate \| Aircraft														133
Accelerated depreciation recorded on aircraft													$ 89
Increase (decrease) in net income per basic share due to change in estimate \| $ / shares													$ (0.26)
Increase (decrease) in net income per diluted share due to change in estimate \| $ / shares													$ (0.23)
International Association Of Machinists
Merger, Acquisition, Integration Costs and Other Charges [Line Items]
Labor agreement costs		$ 127
8% Notes Indenture
Merger, Acquisition, Integration Costs and Other Charges [Line Items]
Debt instrument stated interest rate															8.00%
Debt instrument, fair value															$ 88
Principal amount of senior notes															$ 125
UAL 8% Contingent Senior Notes
Merger, Acquisition, Integration Costs and Other Charges [Line Items]
Debt instrument stated interest rate									8.00%					8.00%	8.00%
Principal amount of senior notes									$ 188					$ 188
Debt instrument convertible effective interest rate									8.00%					8.00%
United Air Lines 8% Senior Notes Due 2024
Merger, Acquisition, Integration Costs and Other Charges [Line Items]
Principal amount of senior notes									$ 400					$ 400
Debt instrument convertible effective interest rate									8.00%					8.00%
Debt instrument maturity year									2024					2024
UAL 6% Senior Convertible Notes
Merger, Acquisition, Integration Costs and Other Charges [Line Items]
Debt instrument stated interest rate					6.00%				6.00%				6.00%	6.00%	6.00%
Principal amount of senior notes									$ 652					$ 652
Debt instrument convertible effective interest rate									6.00%					6.00%
Debt instrument maturity year									2031					2031
United Air Lines 6% Notes Due 2026
Merger, Acquisition, Integration Costs and Other Charges [Line Items]
Debt instrument stated interest rate					6.00%								6.00%
Principal amount of senior notes									$ 326					$ 326
Debt instrument convertible effective interest rate									6.00%					6.00%
Debt instrument maturity year									2026					2026
United Air Lines 6% Notes Due 2028
Merger, Acquisition, Integration Costs and Other Charges [Line Items]
Debt instrument stated interest rate					6.00%								6.00%
Principal amount of senior notes									$ 326					$ 326
Debt instrument convertible effective interest rate									6.00%					6.00%
Debt instrument maturity year									2028					2028
Subsequent Event \| Cleveland
Merger, Acquisition, Integration Costs and Other Charges [Line Items]
Reductions in number of peak day mainline departures \| Departure	1
Number of peak day mainline departures \| Departure	26
Reductions in regional departures rate of increments in each of early April, May and June 2014	0.33
Number of peak day flights from Cleveland after reductions \| Departure	72
Number of destinations from Cleveland on non-stop basis \| Location	20
Subsequent Event \| Cleveland \| Weighted Average
Merger, Acquisition, Integration Costs and Other Charges [Line Items]
Percentage of flight reductions in average daily departures from Cleveland	60.00%
Subsequent Event \| Cleveland \| Minimum
Merger, Acquisition, Integration Costs and Other Charges [Line Items]
Percentage of flight reductions in regional departures from Cleveland	70.00%
Subsequent Event \| Cleveland \| Maximum
Merger, Acquisition, Integration Costs and Other Charges [Line Items]
Reductions in number airport operations and catering positions in Cleveland \| Operation	470
Voluntary retirement program
Merger, Acquisition, Integration Costs and Other Charges [Line Items]
Severance and benefits												32	$ 64
Accruals for future rent					$ 11								$ 11
Number of leased air craft \| Aircraft													4
Voluntary leave of absence program
Merger, Acquisition, Integration Costs and Other Charges [Line Items]
Severance and benefits												$ 17	$ 26
Involuntary severance programs
Merger, Acquisition, Integration Costs and Other Charges [Line Items]
Severance and benefits													$ 15
Continental Airlines Inc
Merger, Acquisition, Integration Costs and Other Charges [Line Items]
Aircraft-related charges (gains), net														$ 46
United Continental Holdings Inc
Merger, Acquisition, Integration Costs and Other Charges [Line Items]
Labor agreement costs														475
United Continental Holdings Inc \| Pilot Disability Plan
Merger, Acquisition, Integration Costs and Other Charges [Line Items]
Labor agreement costs														$ 80

Accrual Activity (Detail) - USD ($) $ in Millions	12 Months Ended
Accrual Activity (Detail) - USD ($) $ in Millions	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Severance/ Medical Costs
Schedule Of Accrual Activity [Line Items]
Beginning Balance	$ 65	$ 55	$ 102
Accrual	120	170	21
Payments	(94)	(160)	(68)
Ending Balance	91	65	55
Permanently Grounded Aircraft
Schedule Of Accrual Activity [Line Items]
Beginning Balance	5	31	41
Accrual	10	(1)	5
Payments	(4)	(25)	(15)
Ending Balance	$ 11	$ 5	$ 31

Operating Revenue by Principle Geographic Region (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Total revenues	$ 9,329	$ 10,228	$ 10,001	$ 8,721	$ 8,702	$ 9,909	$ 9,939	$ 8,602	$ 38,279	$ 37,152	$ 37,110
Domestic (U.S. and Canada)
Segment Reporting Information [Line Items]
Total revenues									22,092	21,276	21,922
Pacific
Segment Reporting Information [Line Items]
Total revenues									5,794	6,040	5,404
Atlantic
Segment Reporting Information [Line Items]
Total revenues									7,132	6,582	6,675
Latin America
Segment Reporting Information [Line Items]
Total revenues									3,261	3,254	3,109
United Airlines, Inc.
Segment Reporting Information [Line Items]
Total revenues									38,287	37,160	37,119
United Airlines, Inc. \| Domestic (U.S. and Canada)
Segment Reporting Information [Line Items]
Total revenues									22,100	21,284	21,931
United Airlines, Inc. \| Pacific
Segment Reporting Information [Line Items]
Total revenues									5,794	6,040	5,404
United Airlines, Inc. \| Atlantic
Segment Reporting Information [Line Items]
Total revenues									7,132	6,582	6,675
United Airlines, Inc. \| Latin America
Segment Reporting Information [Line Items]
Total revenues									$ 3,261	$ 3,254	$ 3,109

Schedule of Selected Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Selected Quarterly Financial Data [Line Items]
Operating revenue	$ 9,329	$ 10,228	$ 10,001	$ 8,721	$ 8,702	$ 9,909	$ 9,939	$ 8,602	$ 38,279	$ 37,152	$ 37,110
Income (loss) from operations	235	508	770	(264)	(465)	200	575	(271)	1,249	39	1,822
Net income (loss)	$ 140	$ 379	$ 469	$ (417)	$ (620)	$ 6	$ 339	$ (448)	$ 571	$ (723)	$ 840
Basic earnings (loss) per share	$ 0.39	$ 1.06	$ 1.37	$ (1.26)	$ (1.87)	$ 0.02	$ 1.02	$ (1.36)	$ 1.64	$ (2.18)	$ 2.54
Diluted earnings (loss) per share	$ 0.37	$ 0.98	$ 1.21	$ (1.26)	$ (1.87)	$ 0.02	$ 0.89	$ (1.36)	$ 1.53	$ (2.18)	$ 2.26

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

Allowance for doubtful accounts

Schedule of Effect of Four Quarters Events (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Selected Quarterly Financial Data [Line Items]
Integration-related costs	$ 40	$ 50	$ 45	$ 70	$ 408	$ 60	$ 137	$ 134	$ 205	$ 739	$ 517
Labor agreement costs		127			21	454			127	475
Severance and benefits	91			14			76	49	105	125
Asset impairments	33				24			6	33	30	4
Additional costs associated with the temporarily grounded Boeing 787 aircraft			7	11					18
(Gains) losses on sale of assets and other special charges, net	1	34		(3)	(14)		(7)	(25)	32	(46)	13
Total special items	165	211	52	92	439	514	206	164
Income tax benefit	(7)				(9)			(2)	$ (32)	$ (1)	$ 5
Total special items, net of tax	$ 158	$ 211	$ 52	$ 92	$ 430	$ 514	$ 206	$ 162

Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Valuation and Qualifying Accounts Disclosure [Line Items]

$ 13

$ 7

$ 6

^[1]

Obsolescence allowance- spare parts

Valuation and Qualifying Accounts Disclosure [Line Items]

125

^[1]

Valuation allowance for deferred tax assets

162

125

Valuation and Qualifying Accounts Disclosure [Line Items]

4,603

4,137

4,171

487

333

^[1]

888

367

^[2]

United Airlines, Inc. | Allowance for doubtful accounts

3,806

4,603

4,137

Valuation and Qualifying Accounts Disclosure [Line Items]

^[1]

United Airlines, Inc. | Obsolescence allowance- spare parts

Valuation and Qualifying Accounts Disclosure [Line Items]

125

^[1]

United Airlines, Inc. | Valuation allowance for deferred tax assets

162

125

Valuation and Qualifying Accounts Disclosure [Line Items]

4,503

4,048

4,008

661

371

^[1]

898

206

331

^[2]

163