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Earnings per share, basic

$ 7,340

$ 1,132

$ 571

$ 19.52

$ 3.05

$ 1.64

Earnings per share, diluted

$ 19.47

$ 2.93

$ 1.53

Salaries and related costs

Operating revenue:

Passenger-Mainline

$ 26,333

$ 26,785

$ 25,997

Passenger-Regional

6,452

6,977

7,125

Total passenger revenue

32,785

33,762

33,122

Cargo

937

938

882

Other operating revenue

4,142

4,201

4,283

Total revenue

37,864

38,901

38,287

Operating expense:

9,713

8,935

8,625

Aircraft fuel

7,522

11,675

12,345

Regional capacity purchase

2,290

2,344

2,419

Landing fees and other rent

2,203

2,274

2,090

Depreciation and amortization

1,819

1,679

1,689

Aircraft maintenance materials and outside repairs

1,651

1,779

1,821

Distribution expenses

1,342

1,373

1,390

Aircraft rent

754

883

936

Special charges (Note 16)

326

443

520

Other operating expenses

5,076

5,139

5,193

Total operating expenses

32,696

36,524

37,028

Operating income

5,168

2,377

1,259

Nonoperating income (expense):

Interest expense

(670)

(742)

(781)

Interest capitalized

Interest income

Miscellaneous, net (Note 16)

(351)

(599)

Total other expense

(947)

(1,267)

(622)

Income before income taxes

4,221

1,110

637

Income tax benefit

(3,080)

(4)

(17)

$ 7,301

$ 1,114

$ 654

[1]	UAL and United amounts are substantially the same.

Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

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

$ 7,340

$ 1,132

$ 571

Employee benefit plans

(1,171)

1,626

Fuel derivative financial instruments

182

(510)

Investments and other

(4)

(6)

Total comprehensive income (loss), net

^[1]

248

(1,687)

1,654

7,588

(555)

2,225

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

7,301

1,114

654

Employee benefit plans

(1,171)

1,626

Fuel derivative financial instruments

182

(510)

Investments and other

(4)

(6)

Total comprehensive income (loss), net

248

(1,687)

1,661

$ 7,549

$ (573)

$ 2,315

[1]	UAL and United amounts are substantially the same except for an additional $1 million and $6 million of additional gains related to investments and other and an income tax benefit, respectively, at United in 2013.

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

Cash and cash equivalents

Consolidated Balance Sheets - USD ($)
$ in Millions

Dec. 31, 2015

Dec. 31, 2014

Current assets:

$ 3,006

$ 2,002

Short-term investments

2,190

2,382

Receivables, less allowance for doubtful accounts (2015-$18; 2014-$22)

1,128

1,146

Fuel hedge collateral deposits

577

Aircraft fuel, spare parts and supplies, less obsolescence allowance (2015-$235; 2014-$169)

738

666

Prepaid expenses and other

740

774

Total current assets

7,828

7,547

Operating property and equipment: Owned-

23,728

21,107

Operating property and equipment - owned, gross

4,542

4,016

28,270

25,123

Less-Accumulated depreciation and amortization

(8,339)

(7,079)

Operating property and equipment - owned, net

19,931

18,044

Purchase deposits for flight equipment

788

706

Capital leases-

1,527

1,272

Operating property and equipment - capital leases, gross

332

331

1,859

1,603

Less-Accumulated amortization

(998)

(886)

Operating property and equipment - capital leases, net

861

717

Total property, plant, and equipment, net

21,580

19,467

Other assets:

Goodwill

4,523

Intangibles, less accumulated amortization (2015-$1,144; 2014-$1,049)

4,136

4,284

2,037

Restricted cash

204

276

Other, net

553

498

Other assets total

11,453

9,581

Total assets

40,861

36,595

Current liabilities:

Advance ticket sales

3,753

3,701

Accrued salaries and benefits

2,117

2,058

Accounts payable

1,869

1,882

2,350

1,818

Current maturities of long-term debt

1,224

1,313

Current maturities of capital leases

135

110

Fuel derivative instruments

124

694

Total current liabilities

842

932

12,414

12,508

Long-term debt

9,673

9,953

Long-term obligations under capital leases

727

571

Other liabilities and deferred credits:

Postretirement benefit liability

2,826

2,879

1,882

1,933

Pension liability

1,488

2,226

Advanced purchase of miles

1,010

1,217

Lease fair value adjustment, net

1,000

359

466

Total Other liabilities and deferred credits

1,516

1,446

9,081

11,167

Commitments and contingencies

Stockholder's equity:

Preferred stock

Common stock

Additional capital invested

7,946

7,721

Retained earnings (accumulated deficit)

3,457

(3,883)

Stock held in treasury, at cost

(1,610)

(367)

Accumulated other comprehensive loss

^[1]

(831)

(1,079)

Total stockholders' equity

8,966

2,396

Total liabilities and stockholders' equity (deficit)

40,861

36,595

Cash and cash equivalents

Current assets:

3,000

1,996

Short-term investments

2,190

2,382

Receivables, less allowance for doubtful accounts (2015-$18; 2014-$22)

1,128

1,146

Fuel hedge collateral deposits

577

Aircraft fuel, spare parts and supplies, less obsolescence allowance (2015-$235; 2014-$169)

738

666

Prepaid expenses and other

787

823

Total current assets

7,869

7,590

Operating property and equipment: Owned-

23,728

21,107

Operating property and equipment - owned, gross

4,542

4,016

28,270

25,123

Less-Accumulated depreciation and amortization

(8,339)

(7,079)

Operating property and equipment - owned, net

19,931

18,044

Purchase deposits for flight equipment

788

706

Capital leases-

1,527

1,272

Operating property and equipment - capital leases, gross

332

331

1,859

1,603

Less-Accumulated amortization

(998)

(886)

Operating property and equipment - capital leases, net

861

717

Total property, plant, and equipment, net

21,580

19,467

Other assets:

Goodwill

4,523

Intangibles, less accumulated amortization (2015-$1,144; 2014-$1,049)

4,136

4,284

1,995

Restricted cash

204

276

Other, net

554

1,210

Other assets total

11,412

10,293

Total assets

40,861

37,350

Current liabilities:

Advance ticket sales

3,753

3,701

Accrued salaries and benefits

2,117

2,058

Accounts payable

1,874

1,886

2,350

1,818

Current maturities of long-term debt

1,224

1,313

Current maturities of capital leases

135

110

Fuel derivative instruments

124

694

Total current liabilities

840

933

12,417

12,513

Long-term debt

9,673

9,953

Long-term obligations under capital leases

727

571

Other liabilities and deferred credits:

Postretirement benefit liability

2,826

2,879

1,882

1,933

Pension liability

1,488

2,226

Advanced purchase of miles

1,010

1,217

Lease fair value adjustment, net

1,000

359

466

Total Other liabilities and deferred credits

1,516

1,957

9,081

11,678

Commitments and contingencies

Stockholder's equity:

Additional capital invested

6,138

7,347

Retained earnings (accumulated deficit)

3,673

(3,628)

Accumulated other comprehensive loss

(831)

(1,079)

Receivable from related parties

(17)

(5)

Total stockholders' equity

8,963

2,635

Total liabilities and stockholders' equity (deficit)

$ 40,861

$ 37,350

[1]	UAL and United amounts are substantially the same except for an additional $1 million and $6 million of additional gains related to investments and other and an income tax benefit, respectively, at United in 2013.

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Receivables, allowance for doubtful accounts	$ 18	$ 22
Aircraft fuel, spare parts and supplies, obsolescence allowance	235	169
Intangibles, accumulated amortization	$ 1,144	$ 1,049
Common stock, par value	$ 0.01	$ 0.01
Common shares, authorized	1,000,000,000	1,000,000,000
Common shares, outstanding	364,609,108	374,525,916
United Airlines, Inc.
Receivables, allowance for doubtful accounts	$ 18	$ 22
Aircraft fuel, spare parts and supplies, obsolescence allowance	235	169
Intangibles, accumulated amortization	$ 1,144	$ 1,049
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, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows from Operating Activities:
Net income	$ 7,340	$ 1,132	$ 571
Adjustments to reconcile net income to net cash provided by operating activities -
Deferred income taxes	(3,177)	13	(14)
Depreciation and amortization	1,819	1,679	1,689
Special charges, non-cash portion	247	78	50
Other operating activities	115	(21)	18
Changes in operating assets and liabilities -
(Increase) decrease in fuel hedge collateral	551	(577)
Unrealized (gain) loss on fuel derivatives	(305)	436	(56)
Decrease in other liabilities	(198)	(238)	(201)
Decrease in frequent flyer deferred revenue and advanced purchase of miles	(200)	(88)	(415)
(Increase) decrease in other assets	(160)	(34)	164
Decrease in accounts payable	(77)	(251)	(265)
Increase in advance ticket sales	52	296	45
(Increase) decrease in receivables	(15)	209	(142)
Net cash provided by operating activities	5,992	2,634	1,444
Cash Flows from Investing Activities:
Capital expenditures	(2,747)	(2,005)	(2,164)
Proceeds from sale of short-term and other investments	2,707	3,112	2,827
Purchases of short-term and other investments	(2,517)	(3,569)	(2,947)
Proceeds from sale of property and equipment	86	94	152
Other, net	(22)	112	110
Net cash used in investing activities	(2,493)	(2,256)	(2,022)
Cash Flows from Financing Activities:
Payments of long-term debt	(2,178)	(2,503)	(2,185)
Repurchases of common stock	(1,233)	(312)
Proceeds from issuance of long-term debt	1,073	1,432	1,423
Principal payments under capital leases	(123)	(127)	(134)
Capitalized financing costs	(37)	(104)	(103)
Proceeds from the exercise of stock options	16	60	29
Other	(13)	(42)	(2)
Net cash used in financing activities	(2,495)	(1,596)	(972)
Net increase (decrease) in cash and cash equivalents	1,004	(1,218)	(1,550)
Cash and cash equivalents at beginning of year	2,002	3,220	4,770
Cash and cash equivalents at end of year	3,006	2,002	3,220
Investing and Financing Activities Not Affecting Cash:
Property and equipment acquired through the issuance of debt	866	1,114	229
Operating lease conversions to capital lease	285
Airport construction financing	17	14	40
Exchange of convertible notes for common stock	202	260	240
Cash Paid (Refunded) During the Period for:
Interest (net of amounts capitalized)	660	748	752
Income taxes	15	(16)	(20)
United Airlines, Inc.
Cash Flows from Operating Activities:
Net income	7,301	1,114	654
Adjustments to reconcile net income to net cash provided by operating activities -
Deferred income taxes	(3,136)	13	1
Depreciation and amortization	1,819	1,679	1,689
Special charges, non-cash portion	247	78	50
Other operating activities	115	4	(41)
Changes in operating assets and liabilities -
(Increase) decrease in fuel hedge collateral	551	(577)
Unrealized (gain) loss on fuel derivatives	(305)	436	(56)
Decrease in other liabilities	(199)	(236)	(203)
Decrease in frequent flyer deferred revenue and advanced purchase of miles	(200)	(88)	(415)
(Increase) decrease in other assets	(160)	(34)	163
Decrease in accounts payable	(77)	(251)	(265)
Increase in advance ticket sales	52	296	45
(Increase) decrease in receivables	(15)	209	(142)
Increase in intercompany receivables	(12)		(5)
Decrease in intercompany payables		(118)	(34)
Net cash provided by operating activities	5,981	2,525	1,441
Cash Flows from Investing Activities:
Capital expenditures	(2,747)	(2,005)	(2,164)
Proceeds from sale of short-term and other investments	2,707	3,112	2,827
Purchases of short-term and other investments	(2,517)	(3,569)	(2,947)
Proceeds from sale of property and equipment	86	94	152
Other, net	(22)	112	109
Net cash used in investing activities	(2,493)	(2,256)	(2,023)
Cash Flows from Financing Activities:
Payments of long-term debt	(2,178)	(2,503)	(2,185)
Dividend to UAL	(1,233)	(212)
Proceeds from issuance of long-term debt	1,073	1,432	1,423
Principal payments under capital leases	(123)	(127)	(134)
Capitalized financing costs	(37)	(104)	(103)
Proceeds from the exercise of stock options	16	60	29
Other	(2)	(33)	1
Net cash used in financing activities	(2,484)	(1,487)	(969)
Net increase (decrease) in cash and cash equivalents	1,004	(1,218)	(1,551)
Cash and cash equivalents at beginning of year	1,996	3,214	4,765
Cash and cash equivalents at end of year	3,000	1,996	3,214
Investing and Financing Activities Not Affecting Cash:
Property and equipment acquired through the issuance of debt	866	1,114	229
Operating lease conversions to capital lease	285
Airport construction financing	17	14	40
Transfer of UAL subsidiaries to United		186
Exchange of convertible notes for common stock		156
Cash Paid (Refunded) During the Period for:
Interest (net of amounts capitalized)	660	748	752
Income taxes	$ 15	$ (16)	$ (15)

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 Related Parties, Net

United Airlines, Inc.

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

332

Beginning 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

Convertible debt redemption (in shares)

Convertible debt redemption

241

$ 1

240

Income taxes

(68)

Contribution of asset by UAL

Share-based compensation

Proceeds from exercise of stock options (in shares)

Proceeds from exercise of stock options

UAL contribution related to stock plans

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

(3)

(232)

(3)

$ (232)

362

Ending Balance at Dec. 31, 2013

2,984

3,223

$ 4

7,425

7,590

(38)

(5,015)

(4,743)

608

(232)

Other comprehensive income (loss)

1,132

1,114

1,132

1,114

(1,687)

^[1]

(1,687)

Convertible debt redemption (in shares)

Convertible debt redemption

260

156

260

156

Repurchase of convertible debt

(34)

Dividend and other capital distributions to UAL

(236)

(469)

232

Share-based compensation

Proceeds from exercise of stock options (in shares)

Proceeds from exercise of stock options

UAL contribution related to stock plans

Repurchases of common stock

(320)

Repurchases of common stock (in shares)

(6)

Ending Balance (in shares) at Dec. 31, 2014

(9)

(5)

(9)

(5)

375

Ending Balance at Dec. 31, 2014

2,396

2,635

$ 4

7,721

7,347

(367)

(3,883)

(3,628)

(1,079)

(5)

Other comprehensive income (loss)

7,340

7,301

7,340

7,301

248

^[1]

248

Convertible debt redemption (in shares)

Convertible debt redemption

202

Dividend and other capital distributions to UAL

(1,232)

Share-based compensation

Proceeds from exercise of stock options

UAL contribution related to stock plans

Repurchases of common stock

(1,232)

Repurchases of common stock (in shares)

(21)

Ending Balance (in shares) at Dec. 31, 2015

(11)

(12)

(11)

(12)

365

Ending Balance at Dec. 31, 2015

$ 8,966

$ 8,963

$ 4

$ 7,946

$ 6,138

$ (1,610)

$ 3,457

$ 3,673

$ (831)

$ (17)

[1]	UAL and United amounts are substantially the same except for an additional $1 million and $6 million of additional gains related to investments and other and an income tax benefit, respectively, at United in 2013.

Significant Accounting Policies

12 Months Ended

Dec. 31, 2015

Significant Accounting Policies

NOTE 1 - SIGNIFICANT ACCOUNTING POLICIES

(a)

Use of Estimates—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.

(b)

Revenue Recognition—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. The value of unused passenger tickets is included in current liabilities as Advance ticket sales. 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 of fare, 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.

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. Refundable tickets expire after one year from the date of issuance.

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, 2015, 2014 and 2013.

(c)

Frequent Flyer Accounting—United’s MileagePlus program is designed to increase customer loyalty. Program participants earn 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 miles are recorded in Frequent flyer deferred revenue on the Company’s consolidated balance sheet and recognized into revenue when the transportation is provided.

The Company determines the estimated selling price of 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 an equivalent ticket value less fulfillment discount, which incorporates the expected redemption of miles, as the best estimate of selling price for these miles. The equivalent ticket value 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, loyalty status and geographic region. The estimated selling price of miles is adjusted by a fulfillment discount that considers a number of factors, including redemption patterns of various customer groups.

Co-branded Credit Card Partner Mileage Sales

United has a significant contract, the Consolidated Amended and Restated Co-Branded Card Marketing Services Agreement (the “Co-Brand Agreement”), to sell MileagePlus miles to its co-branded credit card partner, Chase Bank USA, N.A. (“Chase”). United identified the following significant 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 MileagePlus member lists; advertising; and other travel related benefits.

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. 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. Miles expire after 18 months of member account inactivity.

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.

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 and Earned		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)
2015	$	2,999	$	1,050	$	2,173	$	(224)
2014		2,861		882		2,178		(199)
2013		2,903		903		2,174		(174)

(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. The Company’s net cash inflows associated with its restricted cash balances for the years ended December 31, 2015, 2014 and 2013 were $114 million, $75 million and $52 million, respectively.

(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 with an assumed residual value of 10% of original cost.

(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		3 to 15
Computer software		5
Building improvements		1 to 40

As of December 31, 2015 and 2014, the Company had a carrying value of computer software of $279 million and $281 million, respectively. For the years ended December 31, 2015, 2014 and 2013, the Company’s depreciation expense related to computer software was $93 million, $81 million and $72 million, respectively. Aircraft and aircraft spare parts were assumed to have residual values of approximately 10% of original cost, 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 or business combination accounting, 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 $201 million, $179 million and $178 million for the years ended December 31, 2015, 2014 and 2013, respectively.

(l)

Intangibles—The Company has finite-lived and indefinite-lived intangible assets, including goodwill. 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 Note 2 of this report for additional information related to intangibles.

(m)

Long-Lived Asset Impairments—The Company evaluates the carrying value of long-lived 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. 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 16 of this report for additional 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 cash-settled 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 of this report 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. 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.

(r)

Labor Costs—The Company records expenses associated with amendable labor agreements when 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.

(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 operating revenue. 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)

Recently Issued Accounting Standards—The Financial Accounting Standards Board (“FASB”) amended the FASB Accounting Standards Codification and created a new Topic 606, Revenue from Contracts with Customers. This amendment prescribes that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The amendment supersedes the revenue recognition requirements in Topic 605, Revenue Recognition, and most industry-specific guidance throughout the Industry Topics of the Codification, and is effective for annual and interim reporting periods beginning after December 15, 2017. Under the new standard, certain airline ancillary fees directly related to passenger revenue tickets, such as airline change fees and baggage fees, are likely to no longer be considered distinct performance obligations separate from the passenger travel component. In addition, the change fees which were previously recognized when received, will likely be recognized when transportation is provided. The Company is evaluating other impacts on its consolidated financial statements.

The FASB issued Accounting Standards Update No. 2015-03, Interest—Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. This standard amends existing guidance to require the presentation of debt issuance costs in the balance sheet as a deduction from the carrying amount of the related debt liability instead of a deferred charge. The Company adopted the standard as of December 31, 2015. As a result of the adoption, unamortized debt issuance costs previously recorded as an asset on the Company’s balance sheet included under the caption Other, net are now reclassified and presented as a deduction from the carrying amount of the related debt liability. The reclassified amounts were $170 million and $167 million as of December 31, 2015 and 2014, respectively.

The FASB issued Accounting Standards Update No. 2015-07, Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent). Under the standard, investments for which fair value is measured at net asset value per share (or its equivalent) using the practical expedient will no longer be categorized in the fair value hierarchy. It is effective for fiscal years and interim periods beginning after December 15, 2015, but early adoption is permitted. As of December 31, 2015, the Company had approximately $200 million of such investments as part of Short-term investments balance sheet total. In addition, pension plan investments measured at net asset value per share will no longer be categorized within the fair value hierarchy. As of December 31, 2015, the Company had approximately $1.4 billion of such investments. The Company is evaluating other impacts on its consolidated financial statements.

The FASB issued Accounting Standards Update No. 2015-17, Balance Sheet Classification of Deferred Taxes. This standard amends existing guidance to require companies to classify all deferred tax assets and liabilities as noncurrent in the statement of financial position. For a particular tax-paying component of an entity and within a particular tax jurisdiction, all deferred tax liabilities and assets, as well as any related valuation allowance, shall be offset and presented as a single noncurrent amount. As a result, companies will no longer allocate valuation allowances between current and noncurrent deferred tax assets because those allowances also will be classified as noncurrent. As of December 31, 2015, the Company adopted this standard and reclassified approximately $1.5 billion from Current assets: Deferred income taxes to Other assets: Deferred income taxes as of December 31, 2015, and reclassified $591 million from Current assets: Deferred income taxes to Other liabilities and deferred credits: Deferred income taxes as of December 31, 2014.

Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2015

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):


		2015				2014
Item	Asset life (a)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Goodwill		$	4,523			$	4,523


Finite-lived intangible assets
Frequent flyer database (b)	22	$	1,177	$	702	$	1,177	$	624
Hubs	20		145		74		145		67
Contracts	12		135		86		155		86
Patents and tradenames	3		108		108		108		108
Airport slots and gates	8		97		97		97		97
Other	25		109		77		109		67

Total		$	1,771	$	1,144	$	1,791	$	1,049

Indefinite-lived intangible assets
Route authorities		$	1,570			$	1,589
Airport slots and gates			942				956
Tradenames and logos			593				593
Alliances			404				404

Total		$	3,509			$	3,542

(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 2015, 2014 and 2013 was $105 million, $128 million and $142 million, respectively. Projected amortization expense in 2016, 2017, 2018, 2019 and 2020 is $90 million, $79 million, $70 million, $64 million and $58 million, respectively.

See Note 16 of this report for additional 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, 2015

NOTE 3 - COMMON STOCKHOLDERS’ EQUITY AND PREFERRED SECURITIES

In 2014, UAL’s Board of Directors authorized a share repurchase program to acquire up to $1 billion of UAL’s common stock (the “2014 Program”). On July 21, 2015, UAL’s Board of Directors authorized a $3 billion share repurchase program, which the Company expects to complete substantially earlier than its original expected completion date of December 31, 2017 (the “2015 Program”). Under the programs, UAL may repurchase shares through the open market, privately negotiated transactions, block trades, or accelerated share repurchase transactions from time to time in accordance with applicable securities laws. UAL will repurchase shares of common stock subject to prevailing market conditions, and may discontinue such repurchases at any time. In October 2015, pursuant to the 2015 Program, the Company entered into agreements to repurchase approximately $300 million of shares of UAL common stock through an accelerated share repurchase program (the “ASR Program”). The ASR Program was completed in November 2015 and in total, United purchased approximately 5 million shares at an average price of $58.14 under the program. The aggregate number of shares repurchased by UAL under the ASR Program was based on the volume-weighted average price per share of UAL’s common stock during the calculation period, less a discount. In addition to the ASR Program, UAL spent $932 million to repurchase approximately 16 million shares of UAL common stock in open market transactions in the year ended December 31, 2015. As of December 31, 2015, the Company had completed purchases under the 2014 Program and had $2.4 billion remaining to spend under the 2015 Program. See Part II, Item 5, “Market for registrant’s common equity, related stockholder matters and issuer purchases of equity securities” of this report for additional information.

At December 31, 2015, approximately 8 million shares of UAL’s common stock were reserved for future issuance related to the issuance of equity-based awards under the Company’s incentive compensation plans.

As of December 31, 2015, 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.

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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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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Share-Based Compensation Plans

Earnings Per Share

12 Months Ended

Dec. 31, 2015

Earnings Per Share

NOTE 4 - EARNINGS PER SHARE

The computations of UAL’s basic and diluted earnings per share are set forth below for the years ended December 31 (in millions, except per share amounts):


	2015		2014		2013
Basic earnings per share:
Earnings available to common stockholders	$	7,340	$	1,132	$	571

Basic weighted-average shares outstanding		376		371		348

Earnings per share, basic	$	19.52	$	3.05	$	1.64


Diluted earnings per share:
Earnings available to common stockholders	$	7,340	$	1,132	$	571
Effect of dilutive securities		—		11		26

Earnings available to common stockholders including the effect of dilutive securities	$	7,340	$	1,143	$	597


Diluted shares outstanding:
Basic weighted-average shares outstanding		376		371		348
Effect of convertible notes		—		18		42
Effect of employee stock awards		1		1		1

Diluted weighted-average shares outstanding		377		390		391

Earnings per share, diluted	$	19.47	$	2.93	$	1.53

The number of antidilutive securities excluded from the computation of diluted earnings per share amounts were not material.

See Notes 3 and 11 of this report for additional information related to the ASR Program, open market share repurchases, open market purchases of the Company’s convertible debt and exchange of shares for redemption of convertible debt.

Share-Based Compensation Plans

12 Months Ended

Dec. 31, 2015

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.

The Company generally grants incentive compensation awards, including long-term equity-based awards, during the first quarter of the calendar year. In the first quarter of 2015, UAL granted share-based compensation awards pursuant to the United Continental Holdings, Inc. 2008 Incentive Compensation Plan. These share-based compensation awards include approximately 0.2 million shares of restricted stock and 0.3 million of time-vested 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 0.6 million performance-based RSUs that will vest based on UAL’s return on invested capital and the Company’s relative improvement in pre-tax margin for the three years ending December 31, 2017. If these performance conditions are 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):


	2015		2014		2013
Compensation cost (a):
RSUs	$	52	$	104	$	88
Restricted stock		6		10		11
Other		—		—		1

Total	$	58	$	114	$	100

(a) All compensation cost is recorded to Salaries and related costs, with the exception of $3 million and $9 million in 2014 and 2013, respectively, that was recorded in integration-related costs as a component of special items.

The table below summarizes UAL’s unearned compensation and weighted-average remaining period to recognize costs for all outstanding share-based awards that are probable of being achieved for the year ended December 31, 2015 (in millions, except as noted):


	Unearned Compensation		Weighted- Average Remaining Period (in years)
RSUs	$	37		1.5
Restricted stock		4		1.4

Total	$	41

RSUs and Restricted Stock. All outstanding RSUs are to be settled in cash. As of December 31, 2015, UAL had recorded a liability of $102 million related to its RSUs. UAL paid $85 million, $86 million and $29 million related to its RSUs during 2015, 2014 and 2013, 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, 2012		4.3		0.8	$	23.94
Granted		1.8		0.5		25.98
Vested		(0.5)		(0.3)		23.93
Forfeited		(0.2)		(0.1)		24.76

Non-vested at December 31, 2013		5.4		0.9		25.02
Granted		0.9		0.3		43.33
Vested		(2.2)		(0.4)		24.66
Forfeited		(0.3)		(0.1)		28.88

Non-vested at December 31, 2014		3.8		0.7		32.55
Granted		1.0		0.2		66.53
Vested		(1.6)		(0.4)		31.14
Forfeited		(0.6)		(0.2)		46.23

Non-vested at December 31, 2015		2.6		0.3		48.68

The fair value of RSUs and restricted stock that vested in 2015, 2014 and 2013 was $92 million, $97 million and $22 million, respectively. The fair value of the restricted stock awards was 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 vested over a period of either three or four years and have a contractual life of 10 years. Expense related to each portion of an option grant was recognized on a straight-line basis over the specific vesting period for those options. The Company determined the fair value of stock options at the grant date using a Black Scholes option pricing model. As of December 31, 2015, there were less than 0.5 million outstanding stock option awards, all of which were exercisable, with a weighted-average exercise price of $26.80.

Accumulated Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2015

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):


								Deferred Taxes
UAL (a)	Pension and Other Postretirement Unrecognized Actuarial Gains (Losses) and Prior Service Cost			Unrealized Gains (Losses) on Derivatives		Investments and Other		Pension and Other Postretirement Liabilities		Derivative Contracts			Total
Balance at December 31, 2012	$	(927)		$	(10)	$	6	$	(115)	$	—	(d)	$	(1,046)

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

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

Balance at December 31, 2013	$	699		$	11	$	13	$	(115)	$	—	(d)	$	608

Other comprehensive loss before reclassifications (b)		(1,106)	(c)		(599)		—		—		—			(1,705)
Amounts reclassified from accumulated other comprehensive income (b)		(65)			89		(6)		—		—			18

Net current-period other comprehensive income (loss)		(1,171)			(510)		(6)		—		—			(1,687)

Balance at December 31, 2014	$	(472)		$	(499)	$	7	$	(115)	$	—	(d)	$	(1,079)

Other comprehensive income (loss) before reclassifications		78	(c)		(320)		(4)		(28)		115			(159)
Amounts reclassified from accumulated other comprehensive income		31			604		—		(11)		(217)			407

Net current-period other comprehensive income (loss)		109			284		(4)		(39)		(102)			248

Balance at December 31, 2015	$	(363)		$	(215)	$	3	$	(154)	$	(102)		$	(831)


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,
	2015		2014		2013
Derivatives designated as cash flow hedges
Fuel contracts-reclassifications of (gains) losses into earnings	$	604	$	89	$	(18)	Aircraft fuel
Amortization of pension and postretirement items
Amortization of unrecognized (gains) losses and prior service cost and the effect of curtailments and settlements (e)		31		(65)		42	Salaries and related costs
Investments and other
Available-for-sale securities—reclassifications of gains into earnings		—		(6)		—	Miscellaneous, net

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

(b) Income tax expense for these items was offset by the Company’s valuation allowance.

(c) Prior service credits increased by $0 million, $3 million and $331 million and actuarial gains (losses) increased by approximately $78 million, $(1.1) billion and $1.3 billion for 2015, 2014 and 2013, respectively.

(d) Deferred tax balance was offset by the Company’s valuation allowance.

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

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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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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Pension and Other Postretirement Plans

Income Taxes

12 Months Ended

Dec. 31, 2015

Income Taxes

NOTE 7 - INCOME TAXES

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


2015	UAL		United
Current	$	56	$	56
Deferred		(3,177)		(3,136)

	$	(3,121)	$	(3,080)


2014
Current	$	(17)	$	(17)
Deferred		13		13

	$	(4)	$	(4)


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

	$	(32)	$	(17)

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


UAL	2015		2014		2013
Income tax provision at statutory rate	$	1,477	$	395	$	189
State income taxes, net of federal income tax		60		16		5
Foreign income taxes		4		2		3
Nondeductible employee meals		15		15		15
State rate change		—		—		(33)
Valuation allowance		(4,684)		(441)		(219)
Other, net		7		9		8

	$	(3,121)	$	(4)	$	(32)


United	2015		2014		2013
Income tax provision at statutory rate	$	1,477	$	388	$	223
State income taxes, net of federal income tax		60		15		5
Foreign income taxes		4		2		3
Nondeductible employee meals		15		15		15
Derivative market adjustment		—		(7)		(24)
State rate change		—		—		(33)
Valuation allowance		(4,643)		(426)		(229)
Other, net		7		9		23

	$	(3,080)	$	(4)	$	(17)

Temporary differences and carryforwards that give rise to deferred tax assets and liabilities at December 31, 2015 and 2014 were as follows (in millions):


	UAL				United
	December 31,				December 31,
	2015		2014		2015		2014
Deferred income tax asset (liability):
Federal and state net operating loss (“NOL”) carryforwards	$	2,897	$	3,491	$	2,855	$	3,423
Deferred revenue		2,160		2,287		2,160		2,287
Employee benefits, including pension, postretirement and medical		1,662		1,943		1,662		1,943
Alternative minimum tax (“AMT”) credit carryforwards		232		214		232		214
Other		566		657		566		659
Less: Valuation allowance		(48)		(4,751)		(48)		(4,721)

Total deferred tax assets	$	7,469	$	3,841	$	7,427	$	3,805

Depreciation, capitalized interest and other	$	(3,921)	$	(3,212)	$	(3,921)	$	(3,212)
Intangibles		(1,511)		(1,545)		(1,511)		(1,545)
Other		—		(84)		—		(48)

Total deferred tax liabilities	$	(5,432)	$	(4,841)	$	(5,432)	$	(4,805)

Net deferred tax asset (liability)	$	2,037	$	(1,000)	$	1,995	$	(1,000)

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.

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 $8.0 billion for UAL. If not utilized these federal pre-tax NOLs will expire as follows (in billions): $2.1 in 2025, $2.0 in 2026, $1.4 in 2027 and $2.5 after 2028. In addition, the majority of tax benefits of the state net operating losses of $103 million for UAL will expire over a five to 20-year period. Additionally, the Company has $232 million of AMT credit carryforwards which do not expire.

The Company’s income tax benefit was $3.1 billion for the year ended December 31, 2015. A discrete tax benefit of $3.1 billion for the reduction to the U.S. net federal and state deferred tax asset valuation allowance was included in the income tax benefit for the year ended December 31, 2015.

During 2015, after considering all positive and negative evidence and the four sources of taxable income, the Company concluded that its deferred income tax assets are more likely than not to be realized. In evaluating the likelihood of utilizing the Company’s net federal and state deferred tax assets, the significant relevant factors that the Company considered are: (1) its recent history and forecasted profitability; (2) growth in the U.S. and global economies; and (3) future impact of taxable temporary differences. Although the Company was not in a three-year cumulative loss position at December 31, 2014, management concluded that the low level of cumulative pre-tax income, coupled with the Company’s history of operating losses resulted in a determination that a valuation allowance was still necessary. We considered past profitability and future expectations of profitability to determine whether it is more likely than not that we will generate sufficient taxable income to realize our net deferred tax assets. Management placed significant weight on past performance (i.e., losses or near break-even results in 2009 to 2013) as it is more objectively verifiable than projections of future taxable income. However, during 2015, the Company’s pre-tax profit of $4.2 billion benefited from lower oil prices and improved efficiency that resulted in significant taxable income. Additionally, based upon current projection of future earnings, the Company evaluated the NOLs expiration periods and change in ownership limitations under Section 382 of the Internal Revenue Code of 1986, as amended, and determined the NOLs would be realized before expiring beginning in 2025. Therefore, the Company released almost all of its valuation allowance in 2015, resulting in a $3.1 billion benefit in its provision for income taxes. The valuation allowance recorded in AOCI in prior years was released through the income statement and resulted in remaining debits within AOCI of $285 million and $180 million related to pension and derivatives, respectively, which will not be recognized into income tax expense until either the plans are exited or the Company no longer has any outstanding derivatives.

The Company has retained a valuation allowance of $48 million against certain state and local NOLs and credit carryforwards at the end of 2015. The Company expects these NOLs and credits will expire unused due to limited carryforward periods. The ability to utilize these state NOLs and credits will be evaluated on a quarterly basis to determine if there are any significant events or any prudent and feasible tax planning strategies that would affect the Company’s ability to realize these deferred tax assets.

The Company’s effective tax rates differ from the federal statutory rate of 35% primarily because of the impact of changes to existing valuation allowances. The change in the effective tax rate each period is impacted by a number of factors, including the relative mix of domestic and state income tax expense in the U.S., adjustments to the valuation allowances and discrete items. During 2015, the Company reversed a significant portion of valuation allowances. Of the $4.7 billion reversed, $1.5 billion relates to current year income.

The Company’s unrecognized tax benefits related to uncertain tax positions were $24 million, $9 million and $14 million at 2015, 2014 and 2013, respectively. Included in the ending balance at 2015 is $21 million that would affect the Company’s effective tax rate if recognized. The changes in unrecognized tax benefits relating to settlements with taxing authorities, unrecognized tax benefits as a result of tax positions taken during a prior period and unrecognized tax benefits relating from a lapse of the statute of limitations were immaterial during 2015, 2014 and 2013. The Company does not expect significant increases or decreases in their unrecognized tax benefits within the next 12 months.

There are no significant amounts included in the balance at December 31, 2015 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’s federal income tax returns for tax years after 2002 remain subject to examination by the Internal Revenue Service (“IRS”) and state taxing jurisdictions. Currently, there are no ongoing examinations of the Company’s prior year tax returns being conducted by the IRS.

Pension and Other Postretirement Plans

12 Months Ended

Dec. 31, 2015

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, deductibles and other limits as described in the specific plan documentation.

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 2015 and 2014. 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 impact 2015 and 2014 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, 2015		Year Ended December 31, 2014
Accumulated benefit obligation:	$	3,795	$	4,068


Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	4,803	$	4,000
Service cost		124		98
Interest cost		200		201
Actuarial (gain) loss		(298)		807
Gross benefits paid and settlements		(343)		(281)
Other		(13)		(22)

Projected benefit obligation at end of year	$	4,473	$	4,803

Change in plan assets:
Fair value of plan assets at beginning of year	$	2,562	$	2,397
Actual gain (loss) on plan assets		(59)		151
Employer contributions		824		307
Gross benefits paid and settlements		(343)		(281)
Other		(9)		(12)

Fair value of plan assets at end of year	$	2,975	$	2,562

Funded status—Net amount recognized	$	(1,498)	$	(2,241)


	Pension Benefits
	December 31, 2015		December 31, 2014
Amounts recognized in the consolidated balance sheets consist of:
Noncurrent asset	$	2	$	2
Current liability		(12)		(17)
Noncurrent liability		(1,488)		(2,226)

Total liability	$	(1,498)	$	(2,241)

Amounts recognized in accumulated other comprehensive loss consist of:
Net actuarial loss	$	(844)	$	(982)
Prior service loss		(1)		(1)

Total accumulated other comprehensive loss	$	(845)	$	(983)


	Other Postretirement Benefits
	Year Ended December 31, 2015		Year Ended December 31, 2014
Change in benefit obligation:
Benefit obligation at beginning of year	$	2,052	$	1,819
Service cost		21		19
Interest cost		82		88
Plan participants’ contributions		68		67
Benefits paid		(205)		(212)
Actuarial (gain) loss		(22)		262
Other		6		9

Benefit obligation at end of year	$	2,002	$	2,052

Change in plan assets:
Fair value of plan assets at beginning of year	$	57	$	57
Actual return on plan assets		1		1
Employer contributions		135		144
Plan participants’ contributions		68		67
Benefits paid		(205)		(212)
Fair value of plan assets at end of year		56		57

Funded status—Net amount recognized	$	(1,946)	$	(1,995)


	Other Postretirement Benefits
	December 31, 2015		December 31, 2014
Amounts recognized in the consolidated balance sheets consist of:
Current liability	$	(64)	$	(62)
Noncurrent liability		(1,882)		(1,933)

Total liability	$	(1,946)	$	(1,995)

Amounts recognized in accumulated other comprehensive income consist of:
Net actuarial gain	$	236	$	233
Prior service credit		246		278

Total accumulated other comprehensive income	$	482	$	511

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):


	2015		2014
Projected benefit obligation	$	4,292	$	4,625
Accumulated benefit obligation		3,655		3,930
Fair value of plan assets		2,794		2,387

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


	2015				2014				2013
	Pension Benefits		Other Postretirement Benefits		Pension Benefits		Other Postretirement Benefits		Pension Benefits		Other Postretirement Benefits
Service cost	$	124	$	21	$	98	$	19	$	121	$	52
Interest cost		200		82		201		88		191		110
Expected return on plan assets		(194)		(2)		(180)		(2)		(163)		(2)
Amortization of unrecognized actuarial (gain) loss		85		(22)		12		(47)		48		3
Amortization of prior service credits		—		(32)		—		(31)		—		(3)
Other		4		—		1		—		(8)		2

Net periodic benefit cost	$	219	$	47	$	132	$	27	$	189	$	162

The estimated amounts that will be amortized in 2016 out of accumulated other comprehensive income (loss) into net periodic benefit cost are as follows (in millions):


	Pension Benefits		Other Postretirement Benefits
Actuarial (gain) loss	$	71	$	(22)
Prior service credit		—		(32)

The assumptions used for the benefit plans were as follows:


	Pension Benefits
Assumptions used to determine benefit obligations	2015	2014
Discount rate	4.58%	4.20%
Rate of compensation increase	3.66%	3.66%

Assumptions used to determine net expense
Discount rate	4.20%	5.10%
Expected return on plan assets	7.40%	7.36%
Rate of compensation increase	3.51%	3.50%


	Other Postretirement Benefits
Assumptions used to determine benefit obligations	2015		2014
Discount rate		4.49%		4.07%

Assumptions used to determine net expense
Discount rate		4.07%		4.94%
Expected return on plan assets		3.00%		4.00%
Health care cost trend rate assumed for next year		6.75%		7.00%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate in 2023)		5.00%		5.00%

During 2015, the Company experienced changes in its benefit obligations related to changes in discount rates and mortality tables in its pension plans and other postretirement benefit plans. The Company used the Society of Actuaries’ 2014 mortality tables, modified to reflect the Social Security Administration Trustee’s Report on current projections regarding expected longevity improvements.

The Company selected the 2015 discount rate for substantially all of its plans by using a hypothetical portfolio of high quality bonds at December 31, 2015, 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	30-40 %	9.5 %
Fixed-income securities	34-44	5.0
Alternatives	14-27	7.3
Other	0-10	7.0

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, 2015	$	13	$	(11)
Effect on postretirement benefit obligation at December 31, 2015		219		(191)

A one percentage point decrease in the weighted average discount rate would increase the postretirement benefit liability by approximately $227 million and increase the estimated 2015 benefits expense by approximately $12 million.


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

Assets and liabilities measured at fair value are based on the valuation techniques identified in the tables below. The valuation techniques are as follows:

(a) Market approach. Prices and other relevant information generated by market transactions involving identical or comparable assets and liabilities; and

(b) Income approach. Techniques to convert future amounts to a single current value based on market expectations (including present value techniques, option-pricing and excess earnings models).

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


	2015								2014
Pension Plan Assets:	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Equity securities funds	$	1,135	$	254	$	881	$	—	$	1,181	$	388	$	793	$	—
Fixed-income securities		1,109		—		1,100		9		813		—		813		—
Alternatives		527		—		267		260		359		—		148		211
Insurance contract		18		—		—		18		21		—		—		21
Other investments		186		37		149		—		188		—		165		23

Total	$	2,975	$	291	$	2,397	$	287	$	2,562	$	388	$	1,919	$	255

Other Postretirement Benefit Plan Assets:
Deposit administration fund	$	56	$	—	$	—	$	56	$	57	$	—	$	—	$	57

Equity and Fixed-Income. Equities include investments in both developed market and emerging market equity securities. Fixed-income includes primarily U.S. and non-U.S. government fixed-income securities and U.S. and non-U.S corporate fixed-income 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 of cash and other 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, 2015 and 2014 is as follows (in millions):


	2015		2014
Balance at beginning of year	$	312	$	293
Actual return on plan assets:
Sold during the year		11		7
Held at year end		(1)		6
Purchases, sales, issuances and settlements (net)		21		6

Balance at end of year	$	343	$	312

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 2015 calendar year. In 2016, employer anticipated contributions to all of United’s pension and postretirement plans are at least $400 million and approximately $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, 2015 are as follows (in millions):


	Pension		Other Postretirement		Other Postretirement— subsidy receipts
2016	$	282	$	125	$	5
2017		287		128		5
2018		286		131		6
2019		292		135		6
2020		293		140		7
Years 2021 – 2025		1,577		761		40

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 $522 million, $503 million and $433 million in the years ended December 31, 2015, 2014 and 2013, respectively.

Multi-Employer Plans

United’s participation in the IAM National Pension Plan (“IAM Plan”) for the annual period ended December 31, 2015 is outlined in the table below. There have been no significant changes that affect the comparability 2015 and 2014 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 $382 million in employers’ contributions for the year ended December 31, 2014. For 2014, 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 (2015 and 2014)		Green Zone. Plans in the green zone are at least 80 percent funded.
FIP/RP Status Pending/Implemented		No
United’s Contributions		$40 million, $39 million and $38 million in the years ended December 31, 2015, 2014 and 2013, respectively
Surcharge Imposed		No
Expiration Date of Collective Bargaining Agreement		N/A

At the date the financial statements were issued, Forms 5500 were not available for the plan year ending in 2015.

Profit Sharing

Substantially all employees participate in profit sharing based on a percentage of pre-tax earnings, excluding special items, profit sharing expense and share-based compensation. Profit sharing percentages range from 5% to 20% depending on the work group, and in some cases profit sharing percentages vary above and below certain pre-tax margin thresholds. Eligible U.S. co-workers in each participating work group receive 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 work groups. Eligible non-U.S. co-workers receive profit sharing based on the calculation under the U.S. profit sharing plan for management and administrative employees. The Company recorded profit sharing and related payroll tax expense of $698 million, $235 million and $190 million in 2015, 2014 and 2013, respectively. Profit sharing expense is recorded as a component of Salaries and related costs in the Company’s statements of consolidated operations.

Fair Value Measurements

12 Months Ended

Dec. 31, 2015

Fair Value Measurements

NOTE 9 - FAIR VALUE MEASUREMENTS

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 described in Note 8 of this report. 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):


	2015								2014
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
	UAL
Cash and cash equivalents	$	3,006	$	3,006	$	—	$	—	$	2,002	$	2,002	$	—	$	—
Short-term investments:
Corporate debt		891		—		891		—		876		—		876		—
Asset-backed securities		710		—		710		—		901		—		901		—
Certificates of deposit placed through an account registry service (“CDARS”)		281		—		281		—		256		—		256		—
U.S. government and agency notes		72		—		72		—		68		—		68		—
Auction rate securities		9		—		—		9		26		—		—		26
Other fixed-income securities		227		—		227		—		255		—		255		—
Enhanced equipment trust certificates (“EETC”)		26		—		—		26		28		—		—		28
Fuel derivatives liability, net		124		—		124		—		717		—		717		—
Foreign currency derivatives		—		—		—		—		2		—		2		—
Restricted cash		206		206		—		—		320		320		—		—

	United
Cash and cash equivalents	$	3,000	$	3,000	$	—	$	—	$	1,996	$	1,996	$	—	$	—
Short-term investments:
Corporate debt		891		—		891		—		876		—		876		—
Asset-backed securities		710		—		710		—		901		—		901		—
CDARS		281		—		281		—		256		—		256		—
U.S. government and agency notes		72		—		72		—		68		—		68		—
Auction rate securities		9		—		—		9		26		—		—		26
Other fixed-income securities		227		—		227		—		255		—		255		—
EETC		26		—		—		26		28		—		—		28
Fuel derivatives liability, net		124		—		124		—		717		—		717		—
Foreign currency derivatives		—		—		—		—		2		—		2		—
Restricted cash		206		206		—		—		320		320		—		—
Convertible debt derivative asset		—		—		—		—		712		—		—		712
Convertible debt derivative option liability		—		—		—		—		511		—		—		511

United’s debt-related derivatives presented in the tables above related to (a) supplemental indentures that provided that United’s convertible debt was 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 were required to be separated and accounted for as though they were 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 related to the 4.5% Convertible Notes due 2015 (the “4.5% Convertible Notes”). Gains (losses) on these derivatives were recorded in Nonoperating income (expense): Miscellaneous, net in United’s statements of consolidated operations. These derivatives along with their gains (losses) were reported in United’s separate financial statements and were eliminated in consolidation for UAL. In January 2015, the holders of substantially all of the remaining $202 million principal amount of the 4.5% Convertible Notes exercised their conversion option resulting in the issuance of 11 million shares of UAL common stock. The derivative assets and liabilities associated with the 4.5% Convertible Notes were settled in connection with the retirement of the related convertible debt, and the final accounting did not materially impact UAL’s or United’s statements of consolidated operations.

Available-for-sale investment maturities—The short-term investments shown in the table above are classified as available-for-sale. As of December 31, 2015, asset-backed securities have remaining maturities of less than one year to approximately 34 years, corporate debt securities have remaining maturities of less than one year to approximately six years and CDARS have maturities of less than one year. U.S. government and other securities have maturities of less than one year to approximately three years. The EETC securities mature in 2019.

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 as of December 31 (in millions):


	Fair Value of Debt by Fair Value Hierarchy Level
	2015										2014
	Carrying Amount		Fair Value								Carrying Amount (a)		Fair Value
			Total		Level 1		Level 2		Level 3				Total		Level 1		Level 2		Level 3
Long-term debt	$	10,897	$	11,371	$	—	$	8,646	$	2,725	$	11,266	$	12,386	$	—	$	8,568	$	3,818

(a) 2014 amount differs from the amount reported in the Company’s Form 10-K for the fiscal year ended December 31, 2014 due to the adoption of an accounting standard update in 2015. See Note 1(t) Recently Issued Accounting Standards of this report for additional information.

Fair value of the financial instruments included in the tables above 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, 2015

Hedging Activities

NOTE 10 - HEDGING ACTIVITIES

Fuel Derivatives

The Company may hedge a portion of its future fuel requirements to protect against increases in the price of fuel. The Company may restructure hedges in response to market conditions prior to their original settlement dates which may result in changes in hedge coverage levels and the potential recognition of gains or losses on such hedge contracts. As of December 31, 2015, the Company had hedged approximately 17% of its projected fuel requirements (652 million gallons) for 2016, with commonly used financial hedge instruments based on aircraft fuel or crude oil. As of December 31, 2015, the Company had fuel hedges expiring through December 2016.

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 hedge accounting treatment typically include swaps, call options, collars (which consist of a purchased call option and a sold put option), four-way collars (a collar with a higher strike sold call option and a lower strike purchased put option) and other combinations of options. Generally, utilizing hedge accounting, all periodic changes in the fair value of 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 uses certain combinations of derivative contracts that are economic hedges but do not qualify for hedge accounting under GAAP. Additionally, the Company may enter into contracts at different times and later combine those contracts into structures designated for hedge accounting. As with derivatives that qualify for hedge accounting, the economic hedges and individual contracts are part of the Company’s program to mitigate the adverse financial impact of potential increases in the price of fuel. The Company records changes in the fair value of these various contracts that are not designated for hedge accounting to Nonoperating income (expense): Miscellaneous, net in the statements of consolidated operations.

If the Company settles 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.

In addition to cash flow hedges, the Company from time to time enters into fair value hedges related to its aircraft fuel inventory using derivatives such as swaps and futures contracts based on aircraft fuel. Under fair value hedge accounting, the Company records changes in the fair value of both the hedging derivative and the hedged aircraft fuel inventory as fuel expense. The Company records ineffectiveness on fair value hedges as Nonoperating income (expense): Miscellaneous, net in the statements of consolidated operations. As of December 31, 2015, fair value hedges related to aircraft fuel were not material to the Company’s financial statements.

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	2015		2014
Derivatives designated as cash flow hedges
Liabilities:
Fuel contracts due within one year	Fuel derivative instruments	$	119	$	450
Fuel contracts with maturities greater than one year	Other liabilities and deferred credits: Other		—		27

		$	119	$	477

Derivatives not designated for hedge accounting
Assets:
Fuel contracts due within one year	Receivables	$	—	$	6
Liabilities:
Fuel contracts due within one year	Fuel derivative instruments	$	5	$	244
Fuel contracts with maturities greater than one year	Other liabilities and deferred credits: Other		—		2

Total liabilities		$	5	$	246

Total derivatives
Assets:
Fuel contracts due within one year	Receivables	$	—	$	6
Liabilities:
Fuel contracts due within one year	Fuel derivative instruments	$	124	$	694
Fuel contracts with maturities greater than one year	Other liabilities and deferred credits: Other		—		29

Total liabilities		$	124	$	723

Derivative Credit Risk and Fair Value

The Company is exposed to credit losses in the event of non-performance 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 Company had on deposit $26 million and $577 million of collateral with fuel derivative counterparties as of December 31, 2015 and December 31, 2014, respectively. The collateral is recorded as Fuel hedge collateral deposits on the Company’s consolidated balance sheets.

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 and collateral recorded on our consolidated balance sheets. The following table shows the potential net fair value positions (including fuel derivatives and related collateral) had we elected to offset. The table reflects offset at the counterparty level (in millions):


	December 31, 2015		December 31, 2014
Fuel derivative instruments	$	98	$	209
Other liabilities and deferred credits: Other		—		30

Hedge derivatives liabilities, net	$	98	$	239

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 Loss Recognized in AOCI on Derivatives (Effective Portion)				Loss Reclassified from AOCI into Income (Fuel Expense) (Effective Portion)				Amount of Loss Recognized in Nonoperating income (expense): Miscellaneous, net (Ineffective Portion)
	2015		2014		2015		2014		2015		2014
Fuel contracts	$	(320)	$	(599)	$	(604)	$	(89)	$	—	$	(3)

Derivatives not designated for hedge accounting


	Amount of Gain (Loss) Recognized in Nonoperating income (expense): Miscellaneous, net
	2015		2014			2013
Fuel contracts	$	(80)	$	(462	)	$	79

Foreign Currency Derivatives

The Company generates revenues and incurs expenses in numerous foreign currencies. Changes in foreign currency exchange rates impact the Company’s results of operations through changes in the dollar value of foreign currency-denominated operating revenues and expenses. Some of the Company’s more significant foreign currency exposures include the Canadian dollar, Chinese renminbi, European euro, British pound and Japanese yen. At times, the Company uses derivative financial instruments, such as options, collars and forward contracts, to hedge its exposure to foreign currency. At December 31, 2015, the Company had foreign currency derivative contracts in place to hedge European euro denominated sales. The notional amount of the hedges equates to 18% of the Company’s projected European euro denominated net cash inflows for 2016. Net cash relates primarily to passenger ticket sales inflows partially offset by expenses paid in local currencies. At December 31, 2015, the fair value of the Company’s foreign currency derivatives was not material to the Company’s financial statements.

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, 2015

Debt

NOTE 11 - DEBT


(In millions)	At December 31,
	2015		2014
Secured
Notes payable, fixed interest rates of 1.42% to 12.00% (weighted average rate of 5.37% as of December 31, 2015), payable through 2027	$	7,971	$	7,464
Notes payable, floating interest rates of the London Interbank Offered Rate (“LIBOR”) plus 0.20% to 2.85%, payable through 2027		1,302		1,151
Term loan, LIBOR subject to a 0.75% floor, plus 2.75%, or alternative rate based on certain market rates plus 1.75%, due 2019		875		884
Term loan, LIBOR subject to a 0.75% floor, plus 3.00%, or alternative rate based on certain market rates plus 2%, due 2021		194		499
Unsecured
6% Notes due 2026 to 2028 (a)		—		632
6% Senior Notes due 2020 (a)		300		300
6.375% Senior Notes due 2018 (a)		300		300
4.5% Convertible Notes due 2015		—		202
Other		100		101

		11,042		11,533

Less: unamortized debt discount, premiums and debt issuance costs		(145)		(267)	(b)
Less: current portion of long-term debt		(1,224)		(1,313)

Long-term debt, net	$	9,673	$	9,953

(a) UAL is the issuer of this debt. United is a guarantor.

(b) 2014 amount differs from the amount reported in the Company’s Form 10-K for the fiscal year ended December 31, 2014 due to the adoption of an accounting standard update in 2015. See Note 1(t) Recently Issued Accounting Standards of this report for additional information.

The table below presents the Company’s contractual principal payments at December 31, 2015 under then-outstanding long-term debt agreements in each of the next five calendar years (in millions):


2016	$	1,224
2017		822
2018		1,359
2019		1,788
2020		942
After 2020		4,907

	$	11,042

As of December 31, 2015, a substantial portion of the Company’s assets, principally aircraft, route authorities and loyalty program intangible assets, was pledged under various loan and other agreements. As of December 31, 2015, 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.

Secured debt

2013 Credit and Guaranty Agreement. United and UAL are parties to a 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 2019 (of which $875 million was outstanding as of December 31, 2015) (the “Term Loan due 2019”), a $500 million term loan due September 2021 (of which $194 million was outstanding as of December 31, 2015) (the “Term Loan due 2021”) and a $1.35 billion revolving credit facility, with $1.35 billion being available for drawing until April 2018 and $1.315 billion being available for drawing until January 2019.

The term loans under the Credit Agreement bear interest at a variable rate equal to LIBOR plus a margin of, in the case of the Term Loan due 2019, 2.75% per annum and, in the case of the Term Loan due 2021, 3.0% per annum, subject in each case to a 0.75% floor. Borrowings under the revolving credit facility of the Credit Agreement bear interest at a variable rate equal to LIBOR 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 loans must be repaid in consecutive quarterly installments of 0.25% of the original principal amount thereof, with any unpaid balance due, in the case of the Term Loan due 2019, on April 1, 2019 and, in the case of the Term Loan due 2021, on September 15, 2021. United may prepay all or a portion of the term loans 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 Term Loan due 2021 ranks pari passu with the Term Loan due 2019 that United originally borrowed under the Credit Agreement. The Credit Agreement requires United to repay the term loans and any other outstanding borrowings under the Credit Agreement at par plus accrued and unpaid interest if certain changes of control of UAL occur.

As of December 31, 2015, United had its entire capacity of $1.35 billion available under the revolving credit facility of the Company’s Credit Agreement.

As of December 31, 2015, United had cash collateralized $70 million of letters of credit. United also had $437 million of performance bonds relating to various real estate, customs and aircraft financing obligations at December 31, 2015. 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 2019.

EETCs. United has $7.8 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 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 United’s consolidated balance sheet because the proceeds held by the depositary are not United’s assets.

In November 2015 and August 2014, 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 and recorded all of the proceeds from the November 2015 and August 2014 pass-through trusts as debt as of December 31, 2015. Certain details of the pass-through trusts with proceeds received from issuance of debt in 2015 are as follows (in millions, except stated interest rate):


EETC Date	Class	Principal		Final expected distribution date	Stated interest rate		Total debt recorded as of December 31, 2015		Proceeds received from issuance of debt during 2015		Remaining proceeds from issuance of debt to be received in future periods
November 2015	AA	$	334	December 2027		3.45%	$	334	$	334	$	—
November 2015	A		100	December 2022		3.70%		100		100		—
August 2014	A		823	September 2026		3.75%		823		711		—
August 2014	B		238	September 2022		4.625%		238		206		—

		$	1,495				$	1,495	$	1,351	$	—

In 2015, United borrowed approximately $590 million aggregate principal amount from various financial institutions to finance the purchase of several aircraft delivered in 2015. The notes evidencing these borrowings, which are secured by the related aircraft, have maturity dates ranging from 2025 to 2027 and interest rates comprised of the LIBOR plus a specified margin.

Unsecured debt

6% Notes due 2026. In 2015, UAL used cash to repurchase all $321 million par value 6% Notes due 2026 (the “2026 Notes”).

6% Notes due 2028. In 2015, UAL used cash to repurchase all $311 million par value 6% Notes due 2028 (the “2028 Notes”).

In 2015, the Company recorded a nonoperating special charge of $134 million for the extinguishment of the 2026 Notes and the 2028 Notes. The nonoperating special charge is related to the write-off of unamortized debt discounts.

4.5% Convertible Notes due 2015. The 4.5% Convertible Notes were convertible by holders into shares of UAL common stock at a conversion price of approximately $18.93 per share. During 2014, United used $62 million of cash to purchase and retire $28 million aggregate principal amount of its 4.5% Convertible Notes in market transactions. UAL recorded $34 million of the repurchase cost as a reduction of additional paid-in capital. In January 2015, the holders of substantially all of the remaining $202 million principal amount of the 4.5% Convertible Notes exercised their conversion option resulting in the issuance of 11 million shares of UAL common stock.

4.5% Senior Limited-Subordination Convertible Notes due 2021. In January 2014, holders of substantially all of the remaining $156 million outstanding principal amount of the 4.5% Senior Limited-Subordination Convertible Notes due 2021 exercised their right to convert such notes into approximately 5 million shares of UAL common stock.

Convertible Debt Securities and Derivatives. UAL, United and the trustee for the 4.5% Convertible Notes were parties to a supplemental indenture that made United’s convertible debt convertible into shares of UAL common stock. For purposes of United separate-entity reporting, as a result of the remaining outstanding debt having been convertible into the stock of a non-consolidated entity, the embedded conversion options in United’s convertible debt were required to be separated and accounted for as though they were free-standing derivatives.

In addition, UAL’s contractual commitment to provide common stock to satisfy United’s obligation upon conversion of the debt was an embedded call option on UAL common stock that was also required to be separated and accounted for as though it were a free-standing derivative. The fair value of the indenture derivative on a separate-entity reporting basis as of December 31, 2014 was an asset of $712 million. The fair value of the embedded conversion options as of December 31, 2014 was a liability of $511 million. The 4.5% Convertible Notes and their related indenture derivative and conversion options were retired in 2015. The initial contribution of the indenture derivatives to United by UAL was accounted for as additional paid-in capital in United’s separate-entity financial statements. Changes in fair value of both the indenture derivative and the embedded conversion options subsequent to October 1, 2010 were recognized in Nonoperating income (expense).

6% Convertible Senior Notes due 2029. In 2014, UAL issued approximately 12 million shares of UAL common stock in exchange for, or upon conversion of, $104 million in aggregate principal amount of UAL’s outstanding 6% Convertible Senior Notes due 2029 held by the holders of these notes.

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
Various equipment notes and other notes payable		Secured by certain aircraft. The indentures contain events of default that are customary for aircraft financing, including in certain cases cross default to other related aircraft.
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, although the Company currently has ample ability under these restrictions to repurchase stock under the Company’s share repurchase program. 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.
6.375% Senior Notes due 2018 6% Senior Notes due 2020		The indentures for these notes 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, although the Company currently has ample ability under these restrictions to repurchase stock under the Company’s share repurchase program. The indentures contain events of default that are customary for similar financings.

Advanced Purchase of Miles

12 Months Ended

Dec. 31, 2015

NOTE 12 - ADVANCED PURCHASE OF MILES

United previously sold MileagePlus miles to Chase which United recorded as Advanced purchase of miles. The balance of pre-purchased miles is eligible to be allocated by Chase to MileagePlus members’ accounts by a maximum of $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 are secured by a junior lien in all collateral pledged by United under the Credit Agreement. 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 credit card processing agreement among United, Paymentech, LLC and JPMorgan Chase Bank, N.A.

Leases and Capacity Purchase Agreements

12 Months Ended

Dec. 31, 2015

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, 2015, 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		Facility and Other Operating Leases		Aircraft Operating Leases
2016	$	206	$	1,252	$	1,317
2017		162		1,161		1,317
2018		151		899		1,100
2019		86		809		918
2020		66		920		708
After 2020		747		6,799		2,660

Minimum lease payments	$	1,418	$	11,840	$	8,020

Imputed interest		(556)

Present value of minimum lease payments		862
Current portion		(135)

Long-term obligations under capital leases	$	727

As of December 31, 2015, United’s aircraft capital lease minimum payments relate to leases of 47 mainline and 29 regional aircraft as well as to leases of nonaircraft assets. Imputed interest rate ranges are 3.5% to 20.8%.

Aircraft operating leases have initial terms of five to twenty-six years, with expiration dates ranging from 2016 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.

During 2015, the Company reached an agreement with AerCap Holdings N.V., a major aircraft leasing company, to lease used Airbus A319s. Eleven aircraft will be delivered over the next two years beginning in early 2016. In addition, up to 14 more aircraft may be delivered over the next five years subject to certain conditions.

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 $1.5 billion of underlying debt and interest thereon as of December 31, 2015. These leases are typically with municipalities or other governmental entities, which are excluded from the consolidation requirements concerning a variable interest entity (“VIE”). 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.

United’s nonaircraft rent expense was approximately $1.3 billion, $1.4 billion and $1.3 billion for the years ended December 31, 2015, 2014 and 2013, respectively.

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 $461 million, $442 million and $428 million for the years ended December 31, 2015, 2014 and 2013, 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 Company’s merger transaction in 2010, 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 nine years for United. The lease valuation adjustments are classified within other noncurrent liabilities and the net accretion amounts are $107 million, $160 million and $173 million for the years ended December 31, 2015, 2014 and 2013, 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 predetermined 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 521 regional aircraft, and the CPAs have terms expiring through 2029. Aircraft operated under CPAs include aircraft leased directly from the regional carriers and those owned by United or leased from third-party lessors and operated by the regional carriers. See Part I, Item 2, “Properties” of this report for additional information.

In 2015, United entered into amendments to the CPA with SkyWest Airlines, Inc. (“SkyWest”), a wholly-owned subsidiary of SkyWest, Inc., to operate an additional 25 new 76-seat Embraer S.A. (“Embraer”) E175 aircraft under the United Express brand. SkyWest will purchase all of these 76-seat aircraft directly from the manufacturer with deliveries in 2016 and 2017.

In 2015, United also entered into amendments to the CPA with Mesa Air Group, Inc. and Mesa Airlines, Inc. (“Mesa”), a wholly-owned subsidiary of Mesa Air Group, Inc., pursuant to which Mesa will operate under the United Express brand new Embraer E175 aircraft, 15 of which have delivered or are scheduled to deliver in 2016. United will assign its purchase obligations to Mesa with respect to 10 Embraer E175 aircraft at the time of each aircraft’s delivery, subject to certain conditions. Mesa will purchase the remaining five aircraft directly from Embraer; however, United has agreed that United will, under certain conditions, purchase these five aircraft directly from Embraer.

In 2015, United entered into a new Embraer ERJ 145 CPA with Champlain Enterprises, Inc. operating as CommutAir, pursuant to which CommutAir will operate under the United Express brand 40 used Embraer ERJ145 aircraft that are currently being operated by a different carrier operating under the United Express brand, with transfers that started in December 2015 and will continue through 2017.

In 2014 and 2015, United entered into amendments to a contract with Shuttle America Corporation (“Shuttle America”), a wholly-owned subsidiary of Republic Airways Holdings, for Shuttle America to operate 40 new Embraer E175 aircraft under the United Express brand and extend the term of 38 existing Embraer 170 aircraft operating under the United Express brand. Shuttle America will acquire forty 76-seat Embraer E175 aircraft with remaining deliveries from 2016 through 2017, although United has the right to acquire the aircraft under certain circumstances and lease the aircraft to Shuttle America. These 40 aircraft are in addition to United’s other 113 Embraer E175 aircraft that are currently being operated or will in the future be operated by different United Express carriers under CPAs. In a separate but related amendment with Republic Airways Holdings Inc. and its subsidiary, Republic Airline Inc. (“Republic”), United and Republic agreed to remove the remaining 13 Q400 aircraft from United Express service by the second quarter of 2016.

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) an annual projected inflation rate. These amounts exclude variable pass-through costs such as fuel and landing fees, among others. Based on these assumptions as of December 31, 2015, our future payments through the end of the terms of our CPAs are presented in the table below (in millions):


2016	$	1,834
2017		1,884
2018		1,550
2019		1,290
2020		1,155
After 2020		4,932

	$	12,645

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 2016 would result in a corresponding change in annual cash obligations under the CPAs of approximately $144 million (7.9%).

Variable Interest Entities

12 Months Ended

Dec. 31, 2015

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 47 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 207 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, 2015

Commitments and Contingencies

NOTE 15 - COMMITMENTS AND CONTINGENCIES

Commitments. In January 2016, UAL entered into a purchase agreement amendment with The Boeing Company (“Boeing”) for a firm narrowbody aircraft order of 40 Boeing 737 Next Generation (“737NG”) aircraft. As of December 31, 2015 (as adjusted to include the order discussed above), United had firm commitments and options to purchase aircraft from 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 737NG/737 MAX 9		155
Boeing 777-300ER		10
Boeing 787-8/-9/-10		30
Embraer E175		10
(a) United also has options and purchase rights for additional aircraft.

The aircraft listed in the table above are scheduled for delivery from 2016 through 2024.

The table below summarizes United’s commitments as of December 31, 2015, 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). The table below is adjusted to include the impact of the January 2016 Boeing 737NG aircraft order discussed above. Any new firm aircraft orders, including through the exercise of purchase options and purchase rights, will increase the total future capital commitments of the Company.


2016	$	3.4
2017		3.1
2018		3.3
2019		2.9
2020		2.8
After 2020		7.7

	$	23.2

As of December 31, 2015 (as adjusted to include the order discussed above), 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. Financing may be necessary to satisfy the Company’s capital commitments for its firm order aircraft and other related capital expenditures.

Legal and Environmental. The Company has certain contingencies resulting from litigation and claims incident to the ordinary course of business. As of December 31, 2015, 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.

As of December 31, 2015, 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 $1.5 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 $302 million of these obligations are accounted for as capital leases. All of these bonds are due between 2017 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, 2015, the Company had $2.4 billion of floating rate debt and $118 million of fixed rate debt, with remaining terms of up to 12 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 12 years and an aggregate balance of $2.4 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, 2015, approximately $1.3 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, 2015, the Company’s contingent exposure was approximately $224 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 2017 to 2041. The Company did not record a liability at the time these indirect guarantees were made.

Regional Capacity Purchase. As of December 31, 2015, United had 279 call options to purchase regional jet aircraft being operated by certain regional carriers. At December 31, 2015, none of the call options was exercisable because none of the required conditions to make an option exercisable by United was met.

Credit Card Processing Agreements. The Company has agreements with financial institutions that process customer credit card transactions for the sale of air travel and other services. Under certain of the Company’s credit card processing agreements, the financial institutions in certain circumstances have the right to require that the Company maintain a reserve equal to a portion of advance ticket sales that has been processed by that financial institution, but for which the Company 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 the Company does not maintain certain minimum levels of unrestricted cash, cash equivalents and short-term investments (collectively, “Unrestricted Liquidity”). The Company’s current level of Unrestricted Liquidity is substantially in excess of these minimum levels.

Labor Negotiations. As of December 31, 2015, United, including its subsidiaries, had approximately 84,000 employees. Approximately 80% of United’s employees were represented by various U.S. labor organizations as of December 31, 2015.

The Company has reached joint collective bargaining agreements with the majority of its employee groups since the merger transaction in 2010. The Company continues to negotiate in mediation for a joint flight attendant collective bargaining agreement, extensions to the IAM represented employees’ agreements and a joint technician and related employees’ collective bargaining agreement following the rejected proposal for ratification of a joint technician and related employees’ agreement. The Company can provide no assurance that a successful or timely resolution of these labor negotiations will be achieved.

Special Items

12 Months Ended

Dec. 31, 2015

Special Items

NOTE 16 - SPECIAL ITEMS

Special items classified as special charges in the statements of consolidated operations consisted of the following for the years ended December 31 (in millions):


Operating:	2015		2014		2013
Severance and benefit costs	$	107	$	199	$	105
Impairment of assets		79		49		33
Integration-related costs		60		96		205
Labor agreement costs		18		—		127
(Gains) losses on sale of assets and other miscellaneous (gains) losses, net		62		99		50

Special charges		326		443		520
Nonoperating and income taxes:
Loss on extinguishment of debt and other, net		202		74		—
Income tax benefit related to special charges		(11)		(10)		(7)
Income tax benefit associated with valuation allowance release (Note 7)		(3,130)		—		—

Total operating and nonoperating special charges, net of income taxes	$	(2,613)	$	507	$	513

2015

The Company recorded $107 million of severance and benefit costs primarily related to a voluntary early-out program for its flight attendants. In 2014, more than 2,500 flight attendants elected to voluntarily separate from the Company and will receive a severance payment, with a maximum value of $100,000 per participant, based on years of service, with retirement dates through the end of 2016.

The Company recorded $33 million ($22 million net of related income tax benefit) related to its annual assessment of impairment of its indefinite-lived intangible assets (certain domestic slots and international Pacific routes), $8 million for the write-off of unexercised aircraft purchase options and $7 million for inventory held for sale. The Company also recorded other impairments, including $10 million for discontinued internal software projects and $10 million for the impairment of several engines held for sale.

Integration-related costs include compensation costs related primarily to systems integration and training for employees.

During 2015, the Company also recorded $32 million related to charges for legal matters, $18 million related to collective bargaining agreements, $16 million for the cease use of an aircraft under lease and $14 million for losses on the sale of aircraft and other miscellaneous gains and losses.

The Company recorded $202 million of losses as part of Nonoperating income (expense): Miscellaneous, net due primarily to the write-off of $134 million related to the unamortized non-cash debt discount from the extinguishment of the 2026 Notes and the 2028 Notes. During 2015, the Company also recorded a $61 million foreign exchange loss related to its cash holdings in Venezuela. The Venezuelan government has maintained currency controls and fixed official exchange rates (i.e. Sistema Complementario de Administracion de Divisas (“SICAD”), and Sistema Marginal de Divisas (“SIMADI”)) for many years. Previously, airlines were permitted to use the more favorable SICAD rate (currently 13.5 Venezuelan bolivars to one U.S. dollar) if repatriating profits and for payments of local goods and services in Venezuela. During 2015, many of the payments for local goods and services have transitioned to utilizing the SIMADI rate (currently 200 Venezuelan bolivars to one U.S. dollar) or have been required to be paid in U.S. dollars. Furthermore, the Venezuelan government has not permitted the exchange and repatriations of local currency since mid-2014. As a result, the Company changed the exchange rate from historical SICAD rates to a combination of SIMADI and SICAD rates based on projections of future cash payments. Including this adjustment, the Company’s resulting cash balance held in Venezuelan bolivars at December 31, 2015 is approximately $13 million.

2014

The Company recorded $141 million of severance and benefit costs related primarily to a voluntary early-out program for its flight attendants. More than 2,500 participants elected a one-time opportunity to voluntarily separate from the Company and will receive a severance payment, with a maximum value of $100,000 per participant, based on years of service, with retirement dates through the end of 2016. In addition, the Company recorded $58 million of severance and benefits primarily related to reductions of management and front-line employees, including from Hopkins International Airport (“Cleveland”), as part of its cost savings initiatives. The Company is currently evaluating its options regarding its long-term contractual lease commitments at Cleveland. The capacity reductions at Cleveland may result in further special charges, which could be significant, related to our contractual commitments.

The Company recorded a charge of $16 million ($10 million net of related income tax benefits) related to its annual assessment of impairment of its indefinite-lived intangible assets (certain international Pacific routes). In addition, the Company also recorded $33 million for charges related primarily to impairment of its flight equipment held for disposal associated with its Boeing 737-300 and 737-500 fleets.

Integration-related costs included compensation costs related to systems integration, training, severance and relocation for employees.

The Company recorded $66 million for the permanent grounding of 21 of the Company’s Embraer ERJ 135 regional aircraft under lease through 2018, which included an accrual for remaining lease payments and an amount for maintenance return conditions. The Company decided to permanently ground these 21 Embraer ERJ 135 aircraft as a result of new Embraer E175 regional jet deliveries, the impact of pilot shortages at regional carriers and fuel prices. In addition, the Company also recorded $33 million for losses on the sale of assets and other special charges.

United used cash to retire, at par, the entire $248 million principal balance of the 6% Convertible Debentures and the 6% Convertible Preferred Securities, Term Income Deferrable Equity Securities (TIDES) and incurred $64 million of expense primarily associated with the write-off of the related non-cash debt discounts. The Company also recorded $10 million of foreign exchange losses in Venezuela in 2014.

2013

The Company offered a voluntary retirement program for its fleet service, passenger service, storekeeper and pilot work groups. Approximately 1,200 employees volunteered under the program during the fourth quarter of 2013 and United recorded approximately $64 million of severance and benefit costs for the programs. The Company also offered voluntary leave of absence programs which allowed 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 was related to involuntary severance programs associated with flight attendants and other work groups.

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 and $1 million on an intangible asset for a route to Manila in order to reflect the estimated fair value of this asset as part of the Company’s annual impairment test of indefinite-lived intangible assets.

Integration-related costs included compensation costs related to systems integration and training, branding activities, new uniforms, write-off or acceleration of depreciation on systems and facilities that were no longer used or planned to be used for significantly shorter periods, relocation for employees and severance primarily associated with administrative headcount reductions.

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

The Company recorded $18 million associated with the temporary grounding of its Boeing 787 aircraft. The charges were 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. In addition, 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 Boeing 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.

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, 2012	$	65	$	5
Accrual		120		10
Payments		(94)		(4)

Balance at December 31, 2013		91		11
Accrual		199		102
Payments		(181)		(11)

Balance at December 31, 2014		109		102
Accrual		107		30
Payments		(189)		(54)

Balance at December 31, 2015	$	27	$	78

The Company’s accrual and payment activity is primarily related to severance and other compensation expense associated with voluntary employee early retirement programs.

Segment Information

12 Months Ended

Dec. 31, 2015

Segment Information

NOTE 17 - 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):


	2015
Domestic (U.S. and Canada)	$	21,931
Pacific		5,498
Atlantic		7,068
Latin America		3,367

Total	$	37,864


	2014
Domestic (U.S. and Canada)	$	22,320
Pacific		5,767
Atlantic		7,321
Latin America		3,493

Total	$	38,901


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

Total	$	38,279	(a)

(a) UAL and United amounts are substantially the same.

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

Selected Quarterly Financial Data

12 Months Ended

Dec. 31, 2015

NOTE 18 - SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)


UAL	Quarter Ended
(In millions, except per share amounts)	March 31		June 30		September 30		December 31
2015
Operating revenue	$	8,608	$	9,914	$	10,306	$	9,036
Income from operations		741		1,445		1,899		1,081
Net income		508		1,193		4,816		823
Basic earnings per share		1.33		3.14		12.83		2.24
Diluted earnings per share		1.32		3.14		12.82		2.24
2014
Operating revenue	$	8,696	$	10,329	$	10,563	$	9,313
Income (loss) from operations		(349)		906		1,191		625
Net income (loss)		(609)		789		924		28
Basic earnings (loss) per share		(1.66)		2.11		2.49		0.08
Diluted earnings (loss) per share		(1.66)		2.01		2.37		0.07

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
2015
Operating:
Severance and benefit costs	$	50	$	25	$	28	$	4
Impairment of assets		2		11		18		48
Integration-related costs		18		14		15		13
(Gains) losses on sale of assets and other miscellaneous (gains) losses, net		(6)		5		15		66

Special charges		64		55		76		131
Nonoperating and income taxes:
Loss on extinguishment of debt and other, net		6		128		61		7
Income tax benefit related to special charges		—		—		—		(11)
Income tax expense (benefit) associated with valuation allowance release		—		—		(3,218)		88

Total operating and nonoperating special items, net of income taxes	$	70	$	183	$	(3,081)	$	215

2014
Operating:
Severance and benefit costs	$	14	$	38	$	6	$	141
Impairment of assets		1		32		—		16
Integration-related costs		34		17		28		17
Costs associated with permanently grounding Embraer ERJ 135 aircraft		—		66		—		—
Losses on sale of assets and other special (gains) losses, net		3		16		9		5

Special charges		52		169		43		179
Nonoperating and income taxes:
Loss on extinguishment of debt and other, net		21		—		—		53
Income tax benefit related to special charges		(1)		—		(3)		(6)

Total operating and nonoperating special charges, net of income taxes	$	72	$	169	$	40	$	226

See Note 16 of this report for additional information of these items.

Schedule II Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2015

Schedule II Valuation and Qualifying Accounts

Schedule II

Valuation and Qualifying Accounts

For the Years Ended December 31, 2015, 2014 and 2013


(In millions) Description	Balance at Beginning of Period		Additions Charged to Costs and Expenses		Deductions (a)		Other			Balance at End of Period
Allowance for doubtful accounts—UAL and United:
2015	$	22	$	25	$	29	$	—		$	18
2014		13		45		36		—			22
2013		13		35		35		—			13
Obsolescence allowance—spare parts—UAL and United:
2015	$	169	$	38	$	—	$	28		$	235
2014		162		35		28		—			169
2013		125		38		1		—			162
Valuation allowance for deferred tax assets—UAL:
2015	$	4,751	$	—	$	4,703	$	—		$	48
2014		4,591		156		—		4	(b)		4,751
2013		5,388		7		888		84	(b)		4,591
Valuation allowance for deferred tax assets—United:
2015	$	4,721	$	—	$	4,673	$	—		$	48
2014		4,561		167		—		(7)	(b)		4,721
2013		5,288		8		898		163	(b)		4,561

(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, 2015

Use of Estimates

(a)

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 and Earned		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)
2015	$	2,999	$	1,050	$	2,173	$	(224)
2014		2,861		882		2,178		(199)
2013		2,903		903		2,174		(174)

(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 with an assumed residual value of 10% of original cost.

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		3 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 or business combination accounting, 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 $201 million, $179 million and $178 million for the years ended December 31, 2015, 2014 and 2013, 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)

Recently Issued Accounting Standards

(t)

Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

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 and Earned		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)
2015	$	2,999	$	1,050	$	2,173	$	(224)
2014		2,861		882		2,178		(199)
2013		2,903		903		2,174		(174)

(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		3 to 15
Computer software		5
Building improvements		1 to 40

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill and Other Intangible Assets

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


		2015				2014
Item	Asset life (a)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Goodwill		$	4,523			$	4,523


Finite-lived intangible assets
Frequent flyer database (b)	22	$	1,177	$	702	$	1,177	$	624
Hubs	20		145		74		145		67
Contracts	12		135		86		155		86
Patents and tradenames	3		108		108		108		108
Airport slots and gates	8		97		97		97		97
Other	25		109		77		109		67

Total		$	1,771	$	1,144	$	1,791	$	1,049

Indefinite-lived intangible assets
Route authorities		$	1,570			$	1,589
Airport slots and gates			942				956
Tradenames and logos			593				593
Alliances			404				404

Total		$	3,509			$	3,542

(a) Weighted average life expressed in years.

Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2015

Computation of Earnings Per Share

The computations of UAL’s basic and diluted earnings per share are set forth below for the years ended December 31 (in millions, except per share amounts):


	2015		2014		2013
Basic earnings per share:
Earnings available to common stockholders	$	7,340	$	1,132	$	571

Basic weighted-average shares outstanding		376		371		348

Earnings per share, basic	$	19.52	$	3.05	$	1.64


Diluted earnings per share:
Earnings available to common stockholders	$	7,340	$	1,132	$	571
Effect of dilutive securities		—		11		26

Earnings available to common stockholders including the effect of dilutive securities	$	7,340	$	1,143	$	597


Diluted shares outstanding:
Basic weighted-average shares outstanding		376		371		348
Effect of convertible notes		—		18		42
Effect of employee stock awards		1		1		1

Diluted weighted-average shares outstanding		377		390		391

Earnings per share, diluted	$	19.47	$	2.93	$	1.53

Share-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2015

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):


	2015		2014		2013
Compensation cost (a):
RSUs	$	52	$	104	$	88
Restricted stock		6		10		11
Other		—		—		1

Total	$	58	$	114	$	100

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


	Unearned Compensation		Weighted- Average Remaining Period (in years)
RSUs	$	37		1.5
Restricted stock		4		1.4

Total	$	41

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, 2012		4.3		0.8	$	23.94
Granted		1.8		0.5		25.98
Vested		(0.5)		(0.3)		23.93
Forfeited		(0.2)		(0.1)		24.76

Non-vested at December 31, 2013		5.4		0.9		25.02
Granted		0.9		0.3		43.33
Vested		(2.2)		(0.4)		24.66
Forfeited		(0.3)		(0.1)		28.88

Non-vested at December 31, 2014		3.8		0.7		32.55
Granted		1.0		0.2		66.53
Vested		(1.6)		(0.4)		31.14
Forfeited		(0.6)		(0.2)		46.23

Non-vested at December 31, 2015		2.6		0.3		48.68

Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2015

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):


								Deferred Taxes
UAL (a)	Pension and Other Postretirement Unrecognized Actuarial Gains (Losses) and Prior Service Cost			Unrealized Gains (Losses) on Derivatives		Investments and Other		Pension and Other Postretirement Liabilities		Derivative Contracts			Total
Balance at December 31, 2012	$	(927)		$	(10)	$	6	$	(115)	$	—	(d)	$	(1,046)

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

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

Balance at December 31, 2013	$	699		$	11	$	13	$	(115)	$	—	(d)	$	608

Other comprehensive loss before reclassifications (b)		(1,106)	(c)		(599)		—		—		—			(1,705)
Amounts reclassified from accumulated other comprehensive income (b)		(65)			89		(6)		—		—			18

Net current-period other comprehensive income (loss)		(1,171)			(510)		(6)		—		—			(1,687)

Balance at December 31, 2014	$	(472)		$	(499)	$	7	$	(115)	$	—	(d)	$	(1,079)

Other comprehensive income (loss) before reclassifications		78	(c)		(320)		(4)		(28)		115			(159)
Amounts reclassified from accumulated other comprehensive income		31			604		—		(11)		(217)			407

Net current-period other comprehensive income (loss)		109			284		(4)		(39)		(102)			248

Balance at December 31, 2015	$	(363)		$	(215)	$	3	$	(154)	$	(102)		$	(831)


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,
	2015		2014		2013
Derivatives designated as cash flow hedges
Fuel contracts-reclassifications of (gains) losses into earnings	$	604	$	89	$	(18)	Aircraft fuel
Amortization of pension and postretirement items
Amortization of unrecognized (gains) losses and prior service cost and the effect of curtailments and settlements (e)		31		(65)		42	Salaries and related costs
Investments and other
Available-for-sale securities—reclassifications of gains into earnings		—		(6)		—	Miscellaneous, net

(b) Income tax expense for these items was offset by the Company’s valuation allowance.

(d) Deferred tax balance was offset by the Company’s valuation allowance.

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

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Components of Income Tax Expense (Benefit)

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


2015	UAL		United
Current	$	56	$	56
Deferred		(3,177)		(3,136)

	$	(3,121)	$	(3,080)


2014
Current	$	(17)	$	(17)
Deferred		13		13

	$	(4)	$	(4)


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

	$	(32)	$	(17)

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):


UAL	2015		2014		2013
Income tax provision at statutory rate	$	1,477	$	395	$	189
State income taxes, net of federal income tax		60		16		5
Foreign income taxes		4		2		3
Nondeductible employee meals		15		15		15
State rate change		—		—		(33)
Valuation allowance		(4,684)		(441)		(219)
Other, net		7		9		8

	$	(3,121)	$	(4)	$	(32)


United	2015		2014		2013
Income tax provision at statutory rate	$	1,477	$	388	$	223
State income taxes, net of federal income tax		60		15		5
Foreign income taxes		4		2		3
Nondeductible employee meals		15		15		15
Derivative market adjustment		—		(7)		(24)
State rate change		—		—		(33)
Valuation allowance		(4,643)		(426)		(229)
Other, net		7		9		23

	$	(3,080)	$	(4)	$	(17)

Components of Deferred Tax Assets and Liabilities

Temporary differences and carryforwards that give rise to deferred tax assets and liabilities at December 31, 2015 and 2014 were as follows (in millions):


	UAL				United
	December 31,				December 31,
	2015		2014		2015		2014
Deferred income tax asset (liability):
Federal and state net operating loss (“NOL”) carryforwards	$	2,897	$	3,491	$	2,855	$	3,423
Deferred revenue		2,160		2,287		2,160		2,287
Employee benefits, including pension, postretirement and medical		1,662		1,943		1,662		1,943
Alternative minimum tax (“AMT”) credit carryforwards		232		214		232		214
Other		566		657		566		659
Less: Valuation allowance		(48)		(4,751)		(48)		(4,721)

Total deferred tax assets	$	7,469	$	3,841	$	7,427	$	3,805

Depreciation, capitalized interest and other	$	(3,921)	$	(3,212)	$	(3,921)	$	(3,212)
Intangibles		(1,511)		(1,545)		(1,511)		(1,545)
Other		—		(84)		—		(48)

Total deferred tax liabilities	$	(5,432)	$	(4,841)	$	(5,432)	$	(4,805)

Net deferred tax asset (liability)	$	2,037	$	(1,000)	$	1,995	$	(1,000)

Pension and Other Postretirement Plans (Tables)

12 Months Ended

Dec. 31, 2015

Reconciliation of Change in Projected Benefit Obligation and Plan Assets


	Pension Benefits
	Year Ended December 31, 2015		Year Ended December 31, 2014
Accumulated benefit obligation:	$	3,795	$	4,068


Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	4,803	$	4,000
Service cost		124		98
Interest cost		200		201
Actuarial (gain) loss		(298)		807
Gross benefits paid and settlements		(343)		(281)
Other		(13)		(22)

Projected benefit obligation at end of year	$	4,473	$	4,803

Change in plan assets:
Fair value of plan assets at beginning of year	$	2,562	$	2,397
Actual gain (loss) on plan assets		(59)		151
Employer contributions		824		307
Gross benefits paid and settlements		(343)		(281)
Other		(9)		(12)

Fair value of plan assets at end of year	$	2,975	$	2,562

Funded status—Net amount recognized	$	(1,498)	$	(2,241)

Other Postretirement Benefits
	Year Ended December 31, 2015		Year Ended December 31, 2014
Change in benefit obligation:
Benefit obligation at beginning of year	$	2,052	$	1,819
Service cost		21		19
Interest cost		82		88
Plan participants’ contributions		68		67
Benefits paid		(205)		(212)
Actuarial (gain) loss		(22)		262
Other		6		9

Benefit obligation at end of year	$	2,002	$	2,052

Change in plan assets:
Fair value of plan assets at beginning of year	$	57	$	57
Actual return on plan assets		1		1
Employer contributions		135		144
Plan participants’ contributions		68		67
Benefits paid		(205)		(212)
Fair value of plan assets at end of year		56		57

Funded status—Net amount recognized	$	(1,946)	$	(1,995

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

Pension Benefits
	December 31, 2015		December 31, 2014
Amounts recognized in the consolidated balance sheets consist of:
Noncurrent asset	$	2	$	2
Current liability		(12)		(17)
Noncurrent liability		(1,488)		(2,226)

Total liability	$	(1,498)	$	(2,241)

Amounts recognized in accumulated other comprehensive loss consist of:
Net actuarial loss	$	(844)	$	(982)
Prior service loss		(1)		(1)

Total accumulated other comprehensive loss	$	(845)	$	(983)

Other Postretirement Benefits
	December 31, 2015		December 31, 2014
Amounts recognized in the consolidated balance sheets consist of:
Current liability	$	(64)	$	(62)
Noncurrent liability		(1,882)		(1,933)

Total liability	$	(1,946)	$	(1,995)

Amounts recognized in accumulated other comprehensive income consist of:
Net actuarial gain	$	236	$	233
Prior service credit		246		278

Total accumulated other comprehensive income	$	482	$	511

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):


	2015		2014
Projected benefit obligation	$	4,292	$	4,625
Accumulated benefit obligation		3,655		3,930
Fair value of plan assets		2,794		2,387

Components Of Net Periodic Benefit Cost

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


	2015				2014				2013
	Pension Benefits		Other Postretirement Benefits		Pension Benefits		Other Postretirement Benefits		Pension Benefits		Other Postretirement Benefits
Service cost	$	124	$	21	$	98	$	19	$	121	$	52
Interest cost		200		82		201		88		191		110
Expected return on plan assets		(194)		(2)		(180)		(2)		(163)		(2)
Amortization of unrecognized actuarial (gain) loss		85		(22)		12		(47)		48		3
Amortization of prior service credits		—		(32)		—		(31)		—		(3)
Other		4		—		1		—		(8)		2

Net periodic benefit cost	$	219	$	47	$	132	$	27	$	189	$	162

Amortized Accumulated Other Comprehensive Income Into Net Periodic Benefit Cost

The estimated amounts that will be amortized in 2016 out of accumulated other comprehensive income (loss) into net periodic benefit cost are as follows (in millions):


	Pension Benefits		Other Postretirement Benefits
Actuarial (gain) loss	$	71	$	(22)
Prior service credit		—		(32)

Assumptions Used for Benefit Plans

The assumptions used for the benefit plans were as follows:


	Pension Benefits
Assumptions used to determine benefit obligations	2015	2014
Discount rate	4.58%	4.20%
Rate of compensation increase	3.66%	3.66%

Assumptions used to determine net expense
Discount rate	4.20%	5.10%
Expected return on plan assets	7.40%	7.36%
Rate of compensation increase	3.51%	3.50%


	Other Postretirement Benefits
Assumptions used to determine benefit obligations	2015		2014
Discount rate		4.49%		4.07%

Assumptions used to determine net expense
Discount rate		4.07%		4.94%
Expected return on plan assets		3.00%		4.00%
Health care cost trend rate assumed for next year		6.75%		7.00%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate in 2023)		5.00%		5.00%

Allocation of Plan Assets

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


	Percent of Total	Expected Long-Term Rate of Return

Equity securities	30-40 %	9.5 %
Fixed-income securities	34-44	5.0
Alternatives	14-27	7.3
Other	0-10	7.0

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, 2015	$	13	$	(11)
Effect on postretirement benefit obligation at December 31, 2015		219		(191)

Pension and Other Postretirement Plan Assets

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


	2015								2014
Pension Plan Assets:	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Equity securities funds	$	1,135	$	254	$	881	$	—	$	1,181	$	388	$	793	$	—
Fixed-income securities		1,109		—		1,100		9		813		—		813		—
Alternatives		527		—		267		260		359		—		148		211
Insurance contract		18		—		—		18		21		—		—		21
Other investments		186		37		149		—		188		—		165		23

Total	$	2,975	$	291	$	2,397	$	287	$	2,562	$	388	$	1,919	$	255

Other Postretirement Benefit Plan Assets:
Deposit administration fund	$	56	$	—	$	—	$	56	$	57	$	—	$	—	$	57

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, 2015 and 2014 is as follows (in millions):


	2015		2014
Balance at beginning of year	$	312	$	293
Actual return on plan assets:
Sold during the year		11		7
Held at year end		(1)		6
Purchases, sales, issuances and settlements (net)		21		6

Balance at end of year	$	343	$	312

Estimated Future Benefit Payments


	Pension		Other Postretirement		Other Postretirement— subsidy receipts
2016	$	282	$	125	$	5
2017		287		128		5
2018		286		131		6
2019		292		135		6
2020		293		140		7
Years 2021 – 2025		1,577		761		40

Multi-Employer Plans


Pension Fund		IAM National Pension Fund
EIN/ Pension Plan Number		51-6031295 - 002
Pension Protection Act Zone Status (2015 and 2014)		Green Zone. Plans in the green zone are at least 80 percent funded.
FIP/RP Status Pending/Implemented		No
United’s Contributions		$40 million, $39 million and $38 million in the years ended December 31, 2015, 2014 and 2013, respectively
Surcharge Imposed		No
Expiration Date of Collective Bargaining Agreement		N/A

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

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):


	2015								2014
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
	UAL
Cash and cash equivalents	$	3,006	$	3,006	$	—	$	—	$	2,002	$	2,002	$	—	$	—
Short-term investments:
Corporate debt		891		—		891		—		876		—		876		—
Asset-backed securities		710		—		710		—		901		—		901		—
Certificates of deposit placed through an account registry service (“CDARS”)		281		—		281		—		256		—		256		—
U.S. government and agency notes		72		—		72		—		68		—		68		—
Auction rate securities		9		—		—		9		26		—		—		26
Other fixed-income securities		227		—		227		—		255		—		255		—
Enhanced equipment trust certificates (“EETC”)		26		—		—		26		28		—		—		28
Fuel derivatives liability, net		124		—		124		—		717		—		717		—
Foreign currency derivatives		—		—		—		—		2		—		2		—
Restricted cash		206		206		—		—		320		320		—		—

	United
Cash and cash equivalents	$	3,000	$	3,000	$	—	$	—	$	1,996	$	1,996	$	—	$	—
Short-term investments:
Corporate debt		891		—		891		—		876		—		876		—
Asset-backed securities		710		—		710		—		901		—		901		—
CDARS		281		—		281		—		256		—		256		—
U.S. government and agency notes		72		—		72		—		68		—		68		—
Auction rate securities		9		—		—		9		26		—		—		26
Other fixed-income securities		227		—		227		—		255		—		255		—
EETC		26		—		—		26		28		—		—		28
Fuel derivatives liability, net		124		—		124		—		717		—		717		—
Foreign currency derivatives		—		—		—		—		2		—		2		—
Restricted cash		206		206		—		—		320		320		—		—
Convertible debt derivative asset		—		—		—		—		712		—		—		712
Convertible debt derivative option liability		—		—		—		—		511		—		—		511

Carrying Values and Estimated Fair Values of Financial Instruments


	Fair Value of Debt by Fair Value Hierarchy Level
	2015										2014
	Carrying Amount		Fair Value								Carrying Amount (a)		Fair Value
			Total		Level 1		Level 2		Level 3				Total		Level 1		Level 2		Level 3
Long-term debt	$	10,897	$	11,371	$	—	$	8,646	$	2,725	$	11,266	$	12,386	$	—	$	8,568	$	3,818

Hedging Activities (Tables)

12 Months Ended

Dec. 31, 2015

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	2015		2014
Derivatives designated as cash flow hedges
Liabilities:
Fuel contracts due within one year	Fuel derivative instruments	$	119	$	450
Fuel contracts with maturities greater than one year	Other liabilities and deferred credits: Other		—		27

		$	119	$	477

Derivatives not designated for hedge accounting
Assets:
Fuel contracts due within one year	Receivables	$	—	$	6
Liabilities:
Fuel contracts due within one year	Fuel derivative instruments	$	5	$	244
Fuel contracts with maturities greater than one year	Other liabilities and deferred credits: Other		—		2

Total liabilities		$	5	$	246

Total derivatives
Assets:
Fuel contracts due within one year	Receivables	$	—	$	6
Liabilities:
Fuel contracts due within one year	Fuel derivative instruments	$	124	$	694
Fuel contracts with maturities greater than one year	Other liabilities and deferred credits: Other		—		29

Total liabilities		$	124	$	723

Offsetting Liabilities

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


	December 31, 2015		December 31, 2014
Fuel derivative instruments	$	98	$	209
Other liabilities and deferred credits: Other		—		30

Hedge derivatives liabilities, net	$	98	$	239

Schedule of 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 Loss Recognized in AOCI on Derivatives (Effective Portion)				Loss Reclassified from AOCI into Income (Fuel Expense) (Effective Portion)				Amount of Loss Recognized in Nonoperating income (expense): Miscellaneous, net (Ineffective Portion)
	2015		2014		2015		2014		2015		2014
Fuel contracts	$	(320)	$	(599)	$	(604)	$	(89)	$	—	$	(3)

Schedule of Derivative Instruments not Designated as Hedges Losses

Derivatives not designated for hedge accounting


	Amount of Gain (Loss) Recognized in Nonoperating income (expense): Miscellaneous, net
	2015		2014			2013
Fuel contracts	$	(80)	$	(462	)	$	79

Debt (Tables)

12 Months Ended

Dec. 31, 2015

Debt


(In millions)	At December 31,
	2015		2014
Secured
Notes payable, fixed interest rates of 1.42% to 12.00% (weighted average rate of 5.37% as of December 31, 2015), payable through 2027	$	7,971	$	7,464
Notes payable, floating interest rates of the London Interbank Offered Rate (“LIBOR”) plus 0.20% to 2.85%, payable through 2027		1,302		1,151
Term loan, LIBOR subject to a 0.75% floor, plus 2.75%, or alternative rate based on certain market rates plus 1.75%, due 2019		875		884
Term loan, LIBOR subject to a 0.75% floor, plus 3.00%, or alternative rate based on certain market rates plus 2%, due 2021		194		499
Unsecured
6% Notes due 2026 to 2028 (a)		—		632
6% Senior Notes due 2020 (a)		300		300
6.375% Senior Notes due 2018 (a)		300		300
4.5% Convertible Notes due 2015		—		202
Other		100		101

		11,042		11,533

Less: unamortized debt discount, premiums and debt issuance costs		(145)		(267)	(b)
Less: current portion of long-term debt		(1,224)		(1,313)

Long-term debt, net	$	9,673	$	9,953

(a) UAL is the issuer of this debt. United is a guarantor.

Contractual Principal Payments

The table below presents the Company’s contractual principal payments at December 31, 2015 under then-outstanding long-term debt agreements in each of the next five calendar years (in millions):


2016	$	1,224
2017		822
2018		1,359
2019		1,788
2020		942
After 2020		4,907

	$	11,042

Details of Pass Through Trusts

Certain details of the pass-through trusts with proceeds received from issuance of debt in 2015 are as follows (in millions, except stated interest rate):


EETC Date	Class	Principal		Final expected distribution date	Stated interest rate		Total debt recorded as of December 31, 2015		Proceeds received from issuance of debt during 2015		Remaining proceeds from issuance of debt to be received in future periods
November 2015	AA	$	334	December 2027		3.45%	$	334	$	334	$	—
November 2015	A		100	December 2022		3.70%		100		100		—
August 2014	A		823	September 2026		3.75%		823		711		—
August 2014	B		238	September 2022		4.625%		238		206		—

		$	1,495				$	1,495	$	1,351	$	—

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
Various equipment notes and other notes payable		Secured by certain aircraft. The indentures contain events of default that are customary for aircraft financing, including in certain cases cross default to other related aircraft.
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, although the Company currently has ample ability under these restrictions to repurchase stock under the Company’s share repurchase program. 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.
6.375% Senior Notes due 2018 6% Senior Notes due 2020		The indentures for these notes 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, although the Company currently has ample ability under these restrictions to repurchase stock under the Company’s share repurchase program. The indentures contain events of default that are customary for similar financings.

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.

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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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Future Minimum Lease Payments for Capital and Operating Leases

Leases and Capacity Purchase Agreements (Tables)

12 Months Ended

Dec. 31, 2015


	Capital Leases		Facility and Other Operating Leases		Aircraft Operating Leases
2016	$	206	$	1,252	$	1,317
2017		162		1,161		1,317
2018		151		899		1,100
2019		86		809		918
2020		66		920		708
After 2020		747		6,799		2,660

Minimum lease payments	$	1,418	$	11,840	$	8,020

Imputed interest		(556)

Present value of minimum lease payments		862
Current portion		(135)

Long-term obligations under capital leases	$	727

Future Lease Payment Under Terms of Capacity Purchase Agreement

Based on these assumptions as of December 31, 2015, our future payments through the end of the terms of our CPAs are presented in the table below (in millions):


2016	$	1,834
2017		1,884
2018		1,550
2019		1,290
2020		1,155
After 2020		4,932

	$	12,645

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

Schedule of Commitments to Purchase Aircrafts

The table below is adjusted to include the impact of the January 2016 Boeing 737NG aircraft order discussed above. Any new firm aircraft orders, including through the exercise of purchase options and purchase rights, will increase the total future capital commitments of the Company.


2016	$	3.4
2017		3.1
2018		3.3
2019		2.9
2020		2.8
After 2020		7.7

	$	23.2

Aircraft Type

Schedule of Commitments to Purchase Aircrafts

As of December 31, 2015 (as adjusted to include the order discussed above), United had firm commitments and options to purchase aircraft from 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 737NG/737 MAX 9		155
Boeing 777-300ER		10
Boeing 787-8/-9/-10		30
Embraer E175		10
(a) United also has options and purchase rights for additional aircraft.

Special Items (Tables)

12 Months Ended

Dec. 31, 2015

Components of Special Items

Special items classified as special charges in the statements of consolidated operations consisted of the following for the years ended December 31 (in millions):


Operating:	2015		2014		2013
Severance and benefit costs	$	107	$	199	$	105
Impairment of assets		79		49		33
Integration-related costs		60		96		205
Labor agreement costs		18		—		127
(Gains) losses on sale of assets and other miscellaneous (gains) losses, net		62		99		50

Special charges		326		443		520
Nonoperating and income taxes:
Loss on extinguishment of debt and other, net		202		74		—
Income tax benefit related to special charges		(11)		(10)		(7)
Income tax benefit associated with valuation allowance release (Note 7)		(3,130)		—		—

Total operating and nonoperating special charges, net of income taxes	$	(2,613)	$	507	$	513

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, 2012	$	65	$	5
Accrual		120		10
Payments		(94)		(4)

Balance at December 31, 2013		91		11
Accrual		199		102
Payments		(181)		(11)

Balance at December 31, 2014		109		102
Accrual		107		30
Payments		(189)		(54)

Balance at December 31, 2015	$	27	$	78

Segment Information (Tables)

12 Months Ended

Dec. 31, 2015

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):


	2015
Domestic (U.S. and Canada)	$	21,931
Pacific		5,498
Atlantic		7,068
Latin America		3,367

Total	$	37,864


	2014
Domestic (U.S. and Canada)	$	22,320
Pacific		5,767
Atlantic		7,321
Latin America		3,493

Total	$	38,901


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

Total	$	38,279	(a)

(a) UAL and United amounts are substantially the same.

Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2015

Schedule of Selected Quarterly Financial Data


UAL	Quarter Ended
(In millions, except per share amounts)	March 31		June 30		September 30		December 31
2015
Operating revenue	$	8,608	$	9,914	$	10,306	$	9,036
Income from operations		741		1,445		1,899		1,081
Net income		508		1,193		4,816		823
Basic earnings per share		1.33		3.14		12.83		2.24
Diluted earnings per share		1.32		3.14		12.82		2.24
2014
Operating revenue	$	8,696	$	10,329	$	10,563	$	9,313
Income (loss) from operations		(349)		906		1,191		625
Net income (loss)		(609)		789		924		28
Basic earnings (loss) per share		(1.66)		2.11		2.49		0.08
Diluted earnings (loss) per share		(1.66)		2.01		2.37		0.07

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
2015
Operating:
Severance and benefit costs	$	50	$	25	$	28	$	4
Impairment of assets		2		11		18		48
Integration-related costs		18		14		15		13
(Gains) losses on sale of assets and other miscellaneous (gains) losses, net		(6)		5		15		66

Special charges		64		55		76		131
Nonoperating and income taxes:
Loss on extinguishment of debt and other, net		6		128		61		7
Income tax benefit related to special charges		—		—		—		(11)
Income tax expense (benefit) associated with valuation allowance release		—		—		(3,218)		88

Total operating and nonoperating special items, net of income taxes	$	70	$	183	$	(3,081)	$	215

2014
Operating:
Severance and benefit costs	$	14	$	38	$	6	$	141
Impairment of assets		1		32		—		16
Integration-related costs		34		17		28		17
Costs associated with permanently grounding Embraer ERJ 135 aircraft		—		66		—		—
Losses on sale of assets and other special (gains) losses, net		3		16		9		5

Special charges		52		169		43		179
Nonoperating and income taxes:
Loss on extinguishment of debt and other, net		21		—		—		53
Income tax benefit related to special charges		(1)		—		(3)		(6)

Total operating and nonoperating special charges, net of income taxes	$	72	$	169	$	40	$	226

Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]
Cash inflows (outflows) associated with its restricted cash balances	$ 114	$ 75	$ 52
Residual value	10.00%
Carrying value of computer software	$ 279	281
Advertising expense	$ 201	179	178
Minimum
Summary Of Significant Accounting Policies [Line Items]
Refundable tickets expiration period	1 year
Recently Issued Accounting Standards
Summary Of Significant Accounting Policies [Line Items]
Reclassification of debt issuance costs adjustments of carrying amount	$ 170	167
Reclassification of deferred income taxes to other assets	1,500
Reclassification of deferred income taxes to other liabilities and deferred income taxes		591
Recently Issued Accounting Standards \| Pension Benefits
Summary Of Significant Accounting Policies [Line Items]
Pension plan investments measured at net asset value per share	1,400
Recently Issued Accounting Standards \| Short-term Investments
Summary Of Significant Accounting Policies [Line Items]
Investments in certain entities that calculate net asset value per share included in short-term investments	200
Computer software
Summary Of Significant Accounting Policies [Line Items]
Depreciation expense related to computer software	$ 93	$ 81	$ 72
Aircraft and aircraft spare parts
Summary Of Significant Accounting Policies [Line Items]
Residual value	10.00%

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

12 Months Ended

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Significant Accounting Policies [Line Items]

Cash Proceeds from Miles Sold and Earned

$ 2,999

$ 2,861

$ 2,903

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

^[1]

1,050

882

903

Increase in Frequent Flyer Deferred Revenue for Miles Awarded

^[2]

2,173

2,178

2,174

Increase (Decrease) in Advanced Purchase of Miles

^[3]

$ (224)

$ (199)

$ (174)

[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, 2015
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	3 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, 2015

Dec. 31, 2014

Finite-lived intangible assets, Gross Carrying Amount

Goodwill

$ 4,523

1,771

1,791

Finite-lived intangible assets, Accumulated Amortization

1,144

1,049

Indefinite-lived intangible assets, Gross Carrying Amount

$ 3,509

3,542

Frequent Flyer Database

Finite-lived intangible assets, Gross Carrying Amount

^[1],[2]

22 years

^[1]

$ 1,177

1,177

Finite-lived intangible assets, Accumulated Amortization

^[1]

$ 702

624

Hubs

Finite-lived intangible assets, Gross Carrying Amount

^[2]

20 years

$ 145

145

Finite-lived intangible assets, Accumulated Amortization

$ 74

Contracts

Finite-lived intangible assets, Gross Carrying Amount

^[2]

12 years

$ 135

155

Finite-lived intangible assets, Accumulated Amortization

$ 86

Patents And Trade Names

Finite-lived intangible assets, Gross Carrying Amount

^[2]

3 years

$ 108

108

Finite-lived intangible assets, Accumulated Amortization

$ 108

108

Airport Slots and Gates

Finite-lived intangible assets, Gross Carrying Amount

^[2]

8 years

$ 97

Finite-lived intangible assets, Accumulated Amortization

$ 97

Other Intangible Assets

Finite-lived intangible assets, Gross Carrying Amount

^[2]

25 years

$ 109

109

Finite-lived intangible assets, Accumulated Amortization

Route Authorities

Indefinite-lived intangible assets, Gross Carrying Amount

1,570

1,589

Airport Slots And Gates

Indefinite-lived intangible assets, Gross Carrying Amount

942

956

Tradenames And Logos

Indefinite-lived intangible assets, Gross Carrying Amount

593

Alliances

Indefinite-lived intangible assets, Gross Carrying Amount

$ 404

[1]	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.
[2]	Weighted average life expressed in years.

Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Actual and Estimated Amortization Expense [Line Items]
Actual amortization	$ 105	$ 128	$ 142
Projected amortization in 2016	90
Projected amortization in 2017	79
Projected amortization in 2018	70
Projected amortization in 2019	64
Projected amortization in 2020	$ 58

Common Stockholders' Equity and Preferred Securities - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Nov. 30, 2015	Dec. 31, 2015	Oct. 31, 2015	Jul. 21, 2015	Dec. 31, 2014
Schedule Of Stockholders Equity [Line Items]
Share repurchase program authorized amount				$ 3,000,000,000	$ 1,000,000,000
Agreement to repurchase through an accelerated share repurchase program			$ 300,000,000
Amount remaining under repurchase program		$ 2,400,000,000
Common stock reserved for future issuance		8,000,000
Junior preferred stock outstanding		2
Junior preferred stock par value per share		$ 0.01
Preferred stock authorized to issue		250,000,000
Accelerated Share Repurchase Program
Schedule Of Stockholders Equity [Line Items]
Number of shares repurchased	5,000,000
Average price per share under repurchase program		$ 58.14
Open Market Repurchase Program
Schedule Of Stockholders Equity [Line Items]
Number of shares repurchased		16,000,000
Number of shares repurchased, value		$ 932,000,000

Computation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Basic earnings per share:
Earnings available to common stockholders									$ 7,340	$ 1,132	$ 571
Basic weighted-average shares outstanding									376	371	348
Earnings per share, basic	$ 2.24	$ 12.83	$ 3.14	$ 1.33	$ 0.08	$ 2.49	$ 2.11	$ (1.66)	$ 19.52	$ 3.05	$ 1.64
Diluted earnings per share:
Earnings available to common stockholders									$ 7,340	$ 1,132	$ 571
Effect of dilutive securities										11	26
Earnings available to common stockholders including the effect of dilutive securities									$ 7,340	$ 1,143	$ 597
Diluted shares outstanding:
Basic weighted-average shares outstanding									376	371	348
Effect of convertible notes										18	42
Effect of employee stock awards									1	1	1
Diluted weighted-average shares outstanding									377	390	391
Earnings per share, diluted	$ 2.24	$ 12.82	$ 3.14	$ 1.32	$ 0.07	$ 2.37	$ 2.01	$ (1.66)	$ 19.47	$ 2.93	$ 1.53

Share-Based Compensation Plans - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding stock option awards		0.5
Outstanding weighted average exercise price		$ 26.80
RSUs
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	20 days
Share-Based Compensation, award granted	0.3	1.0	0.9	1.8
Share-Based Compensation, vesting period	3 years
Liabilities related to share based payments		$ 102
Payment related to share-based liabilities		85	$ 86	$ 29
Equity awards fair value		$ 92	$ 97	$ 22
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
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, award granted	0.2	0.2	0.3	0.5
Share-Based Compensation, vesting period	3 years
Performance 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	20 days
Share-Based Compensation, award granted	0.6
Share-Based Compensation, vesting period	3 years
Share-Based Compensation, vesting date	Dec. 31, 2017

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

12 Months Ended

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

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

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

^[1]

$ 58

$ 114

$ 100

RSUs

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

^[1]

104

Restricted Stock

^[1]

$ 6

$ 10

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

Accumulated Other Comprehensive Income (Loss) [Line Items]

^[1]

$ 1

[1]	All compensation cost is recorded to Salaries and related costs, with the exception of $3 million and $9 million in 2014 and 2013, respectively, that was recorded in integration-related costs as a component of special items.

Schedule of Share-Based Compensation Plan Cost (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Integration related costs	$ 13	$ 15	$ 14	$ 18	$ 17	$ 28	$ 17	$ 34	$ 60	$ 96	$ 205
Special Charges
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Integration related costs										$ 3	$ 9

Schedule of Unearned Compensation and Weighted Average Remaining Period for Outstanding Share-Based Awards (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned Compensation	$ 41
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned Compensation	$ 37
Weighted- Average Remaining Period (in years)	1 year 6 months
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned Compensation	$ 4
Weighted- Average Remaining Period (in years)	1 year 4 months 24 days

Schedule of Restricted Stock Unit and Restricted Stock Activity (Detail) - $ / shares shares in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested at beginning of year	0.7	0.7	0.9	0.8
Granted, Stock	0.2	0.2	0.3	0.5
Vested, Stock		(0.4)	(0.4)	(0.3)
Forfeited, Stock		(0.2)	(0.1)	(0.1)
Non-vested at end of year, Stock		0.3	0.7	0.9
Weighted-Average Grant Price at beginning of year	$ 32.55	$ 32.55	$ 25.02	$ 23.94
Granted, Weighted-Average Grant Price		66.53	43.33	25.98
Vested, Weighted-Average Grant Price		31.14	24.66	23.93
Forfeited, Weighted-Average Grant Price		46.23	28.88	24.76
Non-vested at end of year, Weighted-Average Grant Price		$ 48.68	$ 32.55	$ 25.02
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested at beginning of year	3.8	3.8	5.4	4.3
Granted, Stock	0.3	1.0	0.9	1.8
Vested, Stock		(1.6)	(2.2)	(0.5)
Forfeited, Stock		(0.6)	(0.3)	(0.2)
Non-vested at end of year, Stock		2.6	3.8	5.4

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

12 Months Ended

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Other comprehensive income (loss) before reclassifications

^[1]

$ (1,079)

$ 608

$ (1,046)

^[1]

(159)

(1,705)

^[2]

1,630

^[2]

Amounts reclassified from accumulated other comprehensive income

^[1]

407

^[2]

^[1]

248

(1,687)

1,654

Pension and Other Postretirement Liabilities

^[1]

(831)

(1,079)

608

Accumulated Other Comprehensive Income (Loss) [Line Items]

Other comprehensive income (loss) before reclassifications

^[1]

(472)

699

(927)

^[1],[3]

(1,106)

^[2]

1,584

^[2]

Amounts reclassified from accumulated other comprehensive income

^[1]

(65)

^[2]

^[1]

109

(1,171)

1,626

Accumulated Other Comprehensive Income (Loss) [Line Items]

^[1]

(363)

(472)

699

Derivative Contracts

Other comprehensive income (loss) before reclassifications

^[1]

(499)

(10)

^[1]

(320)

(599)

^[2]

Amounts reclassified from accumulated other comprehensive income

^[1]

604

^[2]

(18)

^[2]

^[1]

284

(510)

Accumulated Other Comprehensive Income (Loss) [Line Items]

^[1]

(215)

(499)

Investments and Other

Other comprehensive income (loss) before reclassifications

^[1]

^[1]

(4)

^[2]

Amounts reclassified from accumulated other comprehensive income

^[1],[2]

(6)

^[1]

(4)

(6)

Pension and Other Postretirement Deferred Taxes

^[1]

Accumulated Other Comprehensive Income (Loss) [Line Items]

Other comprehensive income (loss) before reclassifications

^[1]

(115)

^[1]

(28)

^[2]

Amounts reclassified from accumulated other comprehensive income

^[1]

(11)

^[1]

(39)

Derivative Contracts Deferred Taxes

^[1]

(154)

(115)

Accumulated Other Comprehensive Income (Loss) [Line Items]

Other comprehensive income (loss) before reclassifications

^[1],[4]

^[1]

115

^[2]

Amounts reclassified from accumulated other comprehensive income

^[1]

(217)

^[1]

(102)

Salaries And Related Costs

^[1]

$ (102)

^[4]

[1]	UAL and United amounts are substantially the same except for an additional $1 million and $6 million of additional gains related to investments and other and an income tax benefit, respectively, at United in 2013.
[2]	Income tax expense for these items was offset by the Company's valuation allowance.
[3]	Prior service credits increased by $0 million, $3 million and $331 million and actuarial gains (losses) increased by approximately $78 million, $(1.1) billion and $1.3 billion for 2015, 2014 and 2013, respectively.
[4]	Deferred tax balance was offset by the Company's valuation allowance.

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

12 Months Ended

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Accumulated Other Comprehensive Income (Loss) [Line Items]

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

^[1]

$ 31

$ (65)

$ 42

Miscellaneous, Net

Accumulated Other Comprehensive Income (Loss) [Line Items]

Available-for-sale securities-reclassifications of gains into earnings

(6)

Fuel Oil Contract | Cash Flow Hedging | Aircraft Fuel

Accumulated Other Comprehensive Income (Loss) [Line Items]

Fuel contracts-reclassifications of (gains) losses into earnings

$ 604

$ 89

$ (18)

[1]	This accumulated other comprehensive income component is included in the computation of net periodic pension and other postretirement costs (see Note 8 of this report for additional information).

Components of Accumulated Other Comprehensive Income (Loss), Net of Tax (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Increase in prior service credits	$ 0	$ 3	$ 331
Increase in actuarial gains (losses)	$ 78	$ (1,100)	1,300
United Airlines, Inc.
Accumulated Other Comprehensive Income (Loss) [Line Items]
Additional gains related to investments and other			1
Income tax (expense) benefit			$ 6

Components of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components Of Income Tax Expense Benefit [Line Items]
Current	$ 56	$ (17)	$ (18)
Deferred	(3,177)	13	(14)
Income tax expense (benefit)	(3,121)	(4)	(32)
United Airlines, Inc.
Components Of Income Tax Expense Benefit [Line Items]
Current	56	(17)	(18)
Deferred	(3,136)	13	1
Income tax expense (benefit)	$ (3,080)	$ (4)	$ (17)

Income Tax Provision Differed from Amounts Computed at Statutory Federal Income Tax Rate (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Income tax provision at statutory rate	$ 1,477	$ 395	$ 189
State income taxes, net of federal income tax	60	16	5
Foreign income taxes	4	2	3
Nondeductible employee meals	15	15	15
State rate change			(33)
Valuation allowance	(4,684)	(441)	(219)
Other, net	7	9	8
Income tax expense (benefit)	(3,121)	(4)	(32)
United Airlines, Inc.
Income Taxes [Line Items]
Income tax provision at statutory rate	1,477	388	223
State income taxes, net of federal income tax	60	15	5
Foreign income taxes	4	2	3
Nondeductible employee meals	15	15	15
Derivative market adjustment		(7)	(24)
State rate change			(33)
Valuation allowance	(4,643)	(426)	(229)
Other, net	7	9	23
Income tax expense (benefit)	$ (3,080)	$ (4)	$ (17)

Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Deferred income tax asset (liability):
Federal and state net operating loss ("NOL") carryforwards	$ 2,897	$ 3,491
Deferred revenue	2,160	2,287
Employee benefits, including pension, postretirement and medical	1,662	1,943
Alternative minimum tax ("AMT") credit carryforwards	232	214
Other	566	657
Less: Valuation allowance	(48)	(4,751)
Total deferred tax assets	7,469	3,841
Depreciation, capitalized interest and other	(3,921)	(3,212)
Intangibles	(1,511)	(1,545)
Other		(84)
Total deferred tax liabilities	(5,432)	(4,841)
Net deferred tax asset	2,037
Net deferred tax (liability)		(1,000)
United Airlines, Inc.
Deferred income tax asset (liability):
Federal and state net operating loss ("NOL") carryforwards	2,855	3,423
Deferred revenue	2,160	2,287
Employee benefits, including pension, postretirement and medical	1,662	1,943
Alternative minimum tax ("AMT") credit carryforwards	232	214
Other	566	659
Less: Valuation allowance	(48)	(4,721)
Total deferred tax assets	7,427	3,805
Depreciation, capitalized interest and other	(3,921)	(3,212)
Intangibles	(1,511)	(1,545)
Other		(48)
Total deferred tax liabilities	(5,432)	(4,805)
Net deferred tax asset	$ 1,995
Net deferred tax (liability)		$ (1,000)

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Alternative minimum tax ("AMT") credit carryforwards	$ 232		$ 232	$ 214
Income tax expense (benefit)			(3,121)	(4)	$ (32)
Income tax benefit associated with valuation allowance release	88	$ (3,218)	(3,130)
Pre-tax profit benefited from lower oil prices and improved efficiency			4,219	1,128	539
Valuation allowance	48		$ 48	4,751
Federal statutory income tax rate			35.00%
Unrecognized tax benefits	24		$ 24	$ 9	$ 14
Unrecognized tax benefits that would impact effective tax rate if recognized	21		21
Derivative
Income Taxes [Line Items]
Valuation allowance	180		$ 180
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
Pension Benefits
Income Taxes [Line Items]
Valuation allowance	285		$ 285
2025
Income Taxes [Line Items]
Net operating loss expiration amount	2,100		2,100
2026
Income Taxes [Line Items]
Net operating loss expiration amount	2,000		2,000
2027
Income Taxes [Line Items]
Net operating loss expiration amount	1,400		1,400
Thereafter
Income Taxes [Line Items]
Net operating loss expiration amount	2,500		2,500
Valuation Allowance Reversal \| Current year income
Income Taxes [Line Items]
Valuation allowance release			1,500
Valuation Allowance Reversal \| Gross Amount
Income Taxes [Line Items]
Valuation allowance release			4,700
Federal
Income Taxes [Line Items]
NOL carry forwards	8,000		8,000
State
Income Taxes [Line Items]
NOL carry forwards	103		103
Valuation allowance	$ 48		$ 48

Reconciliation of Change in Projected Benefit Obligation and Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation:	$ 3,795	$ 4,068
Benefit obligation at beginning of year	4,803	4,000
Service cost	124	98	$ 121
Interest cost	200	201	191
Actuarial (gain) loss	(298)	807
Gross benefits paid and settlements	(343)	(281)
Other	(13)	(22)
Benefit obligation at end of year	4,473	4,803	4,000
Balance at beginning of year	2,562	2,397
Actual gain (loss) on plan assets	(59)	151
Employer contributions	824	307
Gross benefits paid and settlements	(343)	(281)
Other	(9)	(12)
Balance at end of year	2,975	2,562	2,397
Funded status-Net amount recognized	(1,498)	(2,241)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	2,052	1,819
Service cost	21	19	52
Interest cost	82	88	110
Plan participants' contributions	68	67
Benefits paid	(205)	(212)
Actuarial (gain) loss	(22)	262
Other	6	9
Benefit obligation at end of year	2,002	2,052	1,819
Balance at beginning of year	57	57
Actual gain (loss) on plan assets	1	1
Employer contributions	135	144
Plan participants' contributions	68	67
Benefits paid	(205)	(212)
Balance at end of year	56	57	$ 57
Funded status-Net amount recognized	$ (1,946)	$ (1,995)

Amounts Recognized in Consolidated Balance Sheet and Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Other Postretirement Benefits
Amounts recognized in the consolidated balance sheets consist of:
Current liability	$ (64)	$ (62)
Noncurrent liability	(1,882)	(1,933)
Total liability	(1,946)	(1,995)
Amounts recognized in accumulated other comprehensive income (loss) consist of:
Net actuarial gain (loss)	236	233
Prior service credit (loss)	246	278
Total accumulated other comprehensive income (loss)	482	511
Pension Benefits
Amounts recognized in the consolidated balance sheets consist of:
Noncurrent asset	2	2
Current liability	(12)	(17)
Noncurrent liability	(1,488)	(2,226)
Total liability	(1,498)	(2,241)
Amounts recognized in accumulated other comprehensive income (loss) consist of:
Net actuarial gain (loss)	(844)	(982)
Prior service credit (loss)	(1)	(1)
Total accumulated other comprehensive income (loss)	$ (845)	$ (983)

Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 4,292	$ 4,625
Accumulated benefit obligation	3,655	3,930
Fair value of plan assets	$ 2,794	$ 2,387

Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 124	$ 98	$ 121
Interest cost	200	201	191
Expected return on plan assets	(194)	(180)	(163)
Amortization of unrecognized actuarial (gain) loss	85	12	48
Other	4	1	(8)
Net periodic benefit cost	219	132	189
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	21	19	52
Interest cost	82	88	110
Expected return on plan assets	(2)	(2)	(2)
Amortization of unrecognized actuarial (gain) loss	(22)	(47)	3
Amortization of prior service credits	(32)	(31)	(3)
Other			2
Net periodic benefit cost	$ 47	$ 27	$ 162

Amortized Accumulated Other Comprehensive Income Into Net Periodic Benefit Cost (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss	$ 71
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss	(22)
Prior service credit	$ (32)

Assumptions Used for Benefit Plans (Detail)	12 Months Ended
Assumptions Used for Benefit Plans (Detail)	Dec. 31, 2015	Dec. 31, 2014
Pension Benefits
Assumptions used to determine benefit obligations
Discount rate	4.58%	4.20%
Rate of compensation increase	3.66%	3.66%
Assumptions used to determine net expense
Discount rate	4.20%	5.10%
Expected return on plan assets	7.40%	7.36%
Rate of compensation increase	3.51%	3.50%
Other Postretirement Benefits
Assumptions used to determine benefit obligations
Discount rate	4.49%	4.07%
Assumptions used to determine net expense
Discount rate	4.07%	4.94%
Expected return on plan assets	3.00%	4.00%
Health care cost trend rate assumed for next year	6.75%	7.00%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate in 2023)	5.00%	5.00%

Allocation of Plan Assets (Detail) - United Airlines, Inc.	12 Months Ended
	Dec. 31, 2015
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Percent of Total, Minimum	30.00%
Percent of Total, Maximum	40.00%
Expected Long-Term Rate of Return	9.50%
Fixed-Income Securities
Defined Benefit Plan Disclosure [Line Items]
Percent of Total, Minimum	34.00%
Percent of Total, Maximum	44.00%
Expected Long-Term Rate of Return	5.00%
Alternatives
Defined Benefit Plan Disclosure [Line Items]
Percent of Total, Minimum	14.00%
Percent of Total, Maximum	27.00%
Expected Long-Term Rate of Return	7.30%
Other Investments
Defined Benefit Plan Disclosure [Line Items]
Percent of Total, Minimum	0.00%
Percent of Total, Maximum	10.00%
Expected Long-Term Rate of Return	7.00%

Pension and Other Postretirement Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Effect on post retirement benefit obligation, 1% Decrease		$ 227
Effect on total service and interest cost, 1% Decrease		12
Profit sharing and payroll tax expense		$ 698	$ 235	$ 190
Multiemployer Plans, Pension \| IAM National Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Multi-employer plan contributions			$ 382
Minimum
Defined Benefit Plan Disclosure [Line Items]
Percentage of pre-tax earnings paid for profit sharing plan		5.00%
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		$ 191
Effect on total service and interest cost, 1% Decrease		11
Employer contributions		$ 135	$ 144
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		$ 824	307
United Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		522	503	433
United Airlines, Inc. \| Multiemployer Plans, Pension \| IAM National Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Multi-employer plan contributions		$ 40	$ 39	$ 38
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 \| Scenario Forecast
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 120
United Airlines, Inc. \| Pension Benefits \| Minimum \| Scenario Forecast
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 400

Effect of One-Percentage-Point Change in Assumed Health Care Trend Rate (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Effect on total service and interest cost,1% Decrease	$ (12)
Effect on post retirement benefit obligation, 1% Decrease	(227)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Effect on total service and interest cost, 1% Increase	13
Effect on post retirement benefit obligation, 1% Increase	219
Effect on total service and interest cost,1% Decrease	(11)
Effect on post retirement benefit obligation, 1% Decrease	$ (191)

Pension and Other Postretirement Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	$ 2,975	$ 2,562	$ 2,397
Pension Benefits \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	1,135	1,181
Pension Benefits \| Fixed-Income Securities
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	1,109	813
Pension Benefits \| Alternatives
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	527	359
Pension Benefits \| Insurance Contract
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	18	21
Pension Benefits \| Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	186	188
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	56	57	57
Other Postretirement Benefits \| Deposit Administration Fund
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	56	57
Level 1 \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	291	388
Level 1 \| Pension Benefits \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	254	388
Level 1 \| Pension Benefits \| Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	37
Level 2 \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	2,397	1,919
Level 2 \| Pension Benefits \| Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	881	793
Level 2 \| Pension Benefits \| Fixed-Income Securities
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	1,100	813
Level 2 \| Pension Benefits \| Alternatives
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	267	148
Level 2 \| Pension Benefits \| Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	149	165
Level 3
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	343	312	$ 293
Level 3 \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	287	255
Level 3 \| Pension Benefits \| Fixed-Income Securities
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	9
Level 3 \| Pension Benefits \| Alternatives
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	260	211
Level 3 \| Pension Benefits \| Insurance Contract
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	18	21
Level 3 \| Pension Benefits \| Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets		23
Level 3 \| Other Postretirement Benefits \| Deposit Administration Fund
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement plan assets	$ 56	$ 57

Defined Benefit Plan Assets Measured at Fair Value Using Unobservable Inputs (Level Three) (Detail) - Level 3 - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of year	$ 312	$ 293
Actual return on plan assets, Sold during the year	11	7
Actual return on plan assets, Held at year end	(1)	6
Purchases, sales, issuances and settlements (net)	21	6
Balance at end of year	$ 343	$ 312

Estimated Future Benefit Payments (Detail) $ in Millions	Dec. 31, 2015 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2016	$ 282
2017	287
2018	286
2019	292
2020	293
Years 2021 - 2025	1,577
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2016	125
2017	128
2018	131
2019	135
2020	140
Years 2021 - 2025	761
Other Postretirement-Subsidy Receipts
Defined Benefit Plan Disclosure [Line Items]
2016	5
2017	5
2018	6
2019	6
2020	7
Years 2021 - 2025	$ 40

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

12 Months Ended

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Multiemployer Plans [Line Items]

EIN

516031295

Pension Plan Number

002

Pension Protection Act Zone Status (2015 and 2014)

^[1]

Green

FIP/RP Status Pending/Implemented

United's Contributions

$ 382

Surcharge Imposed

Carrying (Reported) Amount, Fair Value Disclosure

Multiemployer Plans [Line Items]

United's Contributions

$ 40

$ 39

$ 38

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

Multi-Employer Plans (Parenthetical) (Detail)	Dec. 31, 2015
Multiemployer Plans, Pension \| IAM National Pension Plan \| Minimum
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, 2015	Dec. 31, 2014
United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt derivative asset		$ 712
Convertible debt derivative option liability		511
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 3,006	2,002
Restricted cash	206	320
Fair Value, Measurements, Recurring \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	3,000	1,996
Restricted cash	206	320
Fair Value, Measurements, Recurring \| Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	710	901
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	710	901
Fair Value, Measurements, Recurring \| Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	891	876
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	891	876
Fair Value, Measurements, Recurring \| CDARS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	281	256
Fair Value, Measurements, Recurring \| CDARS \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	281	256
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	72	68
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	72	68
Fair Value, Measurements, Recurring \| Auction Rate Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	9	26
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	9	26
Fair Value, Measurements, Recurring \| Other Fixed Income Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	227	255
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	227	255
Fair Value, Measurements, Recurring \| EETC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
EETC	26	28
Fair Value, Measurements, Recurring \| EETC \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
EETC	26	28
Fair Value, Measurements, Recurring \| Fuel Derivatives Liability, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, net	124	717
Fair Value, Measurements, Recurring \| Fuel Derivatives Liability, Net \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, net	124	717
Fair Value, Measurements, Recurring \| Foreign Currency Derivatives Asset, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, net		2
Fair Value, Measurements, Recurring \| Foreign Currency Derivatives Asset, Net \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, net		2
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		712
Fair Value, Measurements, Recurring \| Convertible Debt Derivative Option Liability \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt derivative option liability		511
Fair Value, Measurements, Recurring \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	3,006	2,002
Restricted cash	206	320
Fair Value, Measurements, Recurring \| Level 1 \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	3,000	1,996
Restricted cash	206	320
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	710	901
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	710	901
Fair Value, Measurements, Recurring \| Level 2 \| Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	891	876
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	891	876
Fair Value, Measurements, Recurring \| Level 2 \| CDARS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	281	256
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	281	256
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	72	68
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	72	68
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	227	255
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	227	255
Fair Value, Measurements, Recurring \| Level 2 \| Fuel Derivatives Liability, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, net	124	717
Fair Value, Measurements, Recurring \| Level 2 \| Fuel Derivatives Liability, Net \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, net	124	717
Fair Value, Measurements, Recurring \| Level 2 \| Foreign Currency Derivatives Asset, Net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, net		2
Fair Value, Measurements, Recurring \| Level 2 \| Foreign Currency Derivatives Asset, Net \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, net		2
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	9	26
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	9	26
Fair Value, Measurements, Recurring \| Level 3 \| EETC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
EETC	26	28
Fair Value, Measurements, Recurring \| Level 3 \| EETC \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
EETC	$ 26	28
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		712
Fair Value, Measurements, Recurring \| Level 3 \| Convertible Debt Derivative Option Liability \| United Airlines, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt derivative option liability		$ 511

Financial Instruments and Fair Value Measurements - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Fair Value [Line Items]
Debt instrument principal amount			$ 248
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		34 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		6 years
CDARS \| Maximum
Fair Value [Line Items]
Available-for-sale securities remaining maturities		1 year
U.S. Government and Other Securities \| Minimum
Fair Value [Line Items]
Available-for-sale securities remaining maturities		1 year
U.S. Government and Other Securities \| Maximum
Fair Value [Line Items]
Available-for-sale securities remaining maturities		3 years
EETC
Fair Value [Line Items]
Available-for-sale securities remaining maturities		2019
Unsecured Debt \| 4.5% Convertible Notes Due 2015
Fair Value [Line Items]
Debt instrument principal amount	$ 202
Debt instrument stated interest rate	4.50%
Common stock issued in exchange for convertible notes	11
Debt instrument maturity year	2015

Carrying Values and Estimated Fair Values of Financial Instruments (Detail) - USD ($)
$ in Millions

Dec. 31, 2015

Dec. 31, 2014

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt

$ 10,897

$ 11,266

^[1]

Estimate of Fair Value, Fair Value Disclosure

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt fair value

11,371

12,386

Estimate of Fair Value, Fair Value Disclosure | Level 2

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt fair value

8,646

8,568

Estimate of Fair Value, Fair Value Disclosure | Level 3

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt fair value

$ 2,725

$ 3,818

[1]	2014 amount differs from the amount reported in the Company's Form 10-K for the fiscal year ended December 31, 2014 due to the adoption of an accounting standard update in 2015. See Note 1(t) Recently Issued Accounting Standards of this report for additional information.

Hedging Activities - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) gal	Dec. 31, 2014 USD ($)
Derivatives And Hedging Activities [Line Items]
Fuel hedges expiration date	2016-12
Fuel hedge collateral deposits	$ 26	$ 577
Fuel Derivative Instruments
Derivatives And Hedging Activities [Line Items]
Fuel hedge collateral deposits	$ 26	$ 577
2016 Projected
Derivatives And Hedging Activities [Line Items]
Percentage of projection for hedging financial instruments	17.00%
Volume of fuel hedging \| gal	652,000,000
Cash Flow Hedging
Derivatives And Hedging Activities [Line Items]
Percentage of projection of European euro for hedging financial instruments for 2016	18.00%

Description of Derivative Instruments (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities	$ 124	$ 723
Receivables
Derivatives, Fair Value [Line Items]
Fuel contracts, assets		6
Fuel Derivative Instruments
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities	124	694
Other
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities		29
Designated as Hedging Instrument \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities	119	477
Designated as Hedging Instrument \| Cash Flow Hedging \| Fuel Derivative Instruments
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities	119	450
Designated as Hedging Instrument \| Cash Flow Hedging \| Other
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities		27
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities	5	246
Not Designated as Hedging Instrument \| Receivables
Derivatives, Fair Value [Line Items]
Fuel contracts, assets		6
Not Designated as Hedging Instrument \| Fuel Derivative Instruments
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities	$ 5	244
Not Designated as Hedging Instrument \| Other
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities		$ 2

Offsetting Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Offsetting Asset and Liabilities [Line Items]
Potential net fair value positions elected to offset	$ 98	$ 239
Other
Offsetting Asset and Liabilities [Line Items]
Potential net fair value positions elected to offset		30
Fuel Derivative Instruments
Offsetting Asset and Liabilities [Line Items]
Potential net fair value positions elected to offset	$ 98	$ 209

Schedule of Losses on Derivative Instruments (Detail) - Designated as Hedging Instrument - Cash Flow Hedging - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Recognized in AOCI on Derivatives (Effective Portion)	$ (320)	$ (599)
Loss Reclassified from AOCI into Income (Fuel Expense) (Effective Portion)	$ (604)	(89)
Amount of Loss Recognized in Nonoperating income (expense): Miscellaneous, net (Ineffective Portion)		$ (3)

Schedule of Derivative Instruments not Designated as Hedges Losses (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss recognized in Nonoperating income (expense): Miscellaneous, net	$ (80)	$ (462)	$ 79

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

Dec. 31, 2015

Jan. 31, 2015

Dec. 31, 2014

Less: current portion of long-term debt

$ 248

$ (1,224)

(1,313)

Long-term debt, net

9,673

9,953

Less: unamortized debt discount, premiums and debt issuance costs

11,042

11,533

(145)

(267)

^[1]

Less: current portion of long-term debt

(1,224)

(1,313)

Long-term debt, net

9,673

9,953

Secured Debt | Notes payable, fixed interest rates of 1.42% to 12.00% (weighted average rate of 5.37% as of December 31, 2015), payable through 2027 | United Airlines, Inc.

Secured Debt | Notes payable, floating interest rates of the London Interbank Offered Rate ("LIBOR") plus 0.20% to 2.85%, payable through 2027 | United Airlines, Inc.

7,971

7,464

Secured Debt | Term Loan | United Airlines, Inc.

1,302

1,151

Secured Debt | Term Loan, due 2021 | United Airlines, Inc.

875

884

Unsecured Debt | Six Percent Senior Notes Due Twenty Twenty Six To Twenty Twenty Eight | United Airlines, Inc.

194

499

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

^[2]

632

Unsecured Debt | 6.375% Senior Notes due 2018 | United Airlines, Inc.

^[2]

300

Unsecured Debt | 4.5% Convertible Notes Due 2015

^[2]

300

Unsecured Debt | 4.5% Convertible Notes Due 2015 | United Airlines, Inc.

$ 202

Unsecured Debt | Other Debt | United Airlines, Inc.

202

Adjusted For Embedded Conversion Options | United Airlines, Inc.

100

101

Long-term debt, net

$ 9,673

$ 9,953

[1]	2014 amount differs from the amount reported in the Company's Form 10-K for the fiscal year ended December 31, 2014 due to the adoption of an accounting standard update in 2015. See Note 1(t) Recently Issued Accounting Standards of this report for additional information.
[2]	UAL is the issuer of this debt. United is a guarantor.

Debt (Parenthetical) (Detail)

1 Months Ended

12 Months Ended

Jan. 31, 2015

Dec. 31, 2015

Dec. 31, 2014

Senior Notes 6% Due 2020

6.375% Senior Notes due 2018

6.00%

Minimum | United Airlines, Inc.

6.375%

Maximum | United Airlines, Inc.

2025

Secured Debt | Notes payable, fixed interest rates of 1.42% to 12.00% (weighted average rate of 5.37% as of December 31, 2015), payable through 2027 | United Airlines, Inc.

2027

Debt instrument stated interest rate, minimum

1.42%

Debt instrument stated interest rate, maximum

12.00%

Weighted average interest rate

5.37%

Secured Debt | Notes payable, floating interest rates of the London Interbank Offered Rate ("LIBOR") plus 0.20% to 2.85%, payable through 2027 | United Airlines, Inc.

2027

Secured Debt | Term Loan | United Airlines, Inc.

2027

Secured Debt | Term Loan, due 2021 | United Airlines, Inc.

2019

Secured Debt | LIBOR | Term Loan | United Airlines, Inc.

2021

Secured Debt | LIBOR | Term Loan, due 2021 | United Airlines, Inc.

2.75%

Secured Debt | LIBOR | Minimum | Notes payable, floating interest rates of the London Interbank Offered Rate ("LIBOR") plus 0.20% to 2.85%, payable through 2027 | United Airlines, Inc.

3.00%

Secured Debt | LIBOR | Maximum | Notes payable, floating interest rates of the London Interbank Offered Rate ("LIBOR") plus 0.20% to 2.85%, payable through 2027 | United Airlines, Inc.

0.20%

Secured Debt | Interest Rate Floor | Term Loan | United Airlines, Inc.

2.85%

Secured Debt | Interest Rate Floor | Term Loan, due 2021 | United Airlines, Inc.

0.75%

Secured Debt | Certain Market Interest Rates | Term Loan | United Airlines, Inc.

0.75%

Secured Debt | Certain Market Interest Rates | Term Loan, due 2021 | United Airlines, Inc.

1.75%

Unsecured Debt | Six Percent Senior Notes Due Twenty Twenty Six To Twenty Twenty Eight | United Airlines, Inc.

2.00%

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

^[1]

6.00%

^[1]

6.00%

Unsecured Debt | 6.375% Senior Notes due 2018 | United Airlines, Inc.

^[1]

2020

^[1]

6.375%

Unsecured Debt | 4.5% Convertible Notes Due 2015

^[1]

2018

4.50%

Unsecured Debt | 4.5% Convertible Notes Due 2015 | United Airlines, Inc.

2015

4.50%

Unsecured Debt | Minimum | Six Percent Senior Notes Due Twenty Twenty Six To Twenty Twenty Eight | United Airlines, Inc.

2015

Unsecured Debt | Maximum | Six Percent Senior Notes Due Twenty Twenty Six To Twenty Twenty Eight | United Airlines, Inc.

^[1]

2026

Airbus A350-1000 Aircraft

^[1]

2028

[1]	UAL is the issuer of this debt. United is a guarantor.

Contractual Principal Payments (Detail) - UAL and United $ in Millions	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
2016	$ 1,224
2017	822
2018	1,359
2019	1,788
2020	942
After 2020	4,907
Long-term debt	$ 11,042

Debt - Additional Information (Detail) - USD ($) shares in Millions	1 Months Ended		12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term Debt, Gross				$ 248,000,000
Aggregate principal amount of convertible senior notes exchanged			$ 202,000,000	$ 260,000,000	$ 240,000,000
6% Convertible Senior Notes
Debt Instrument [Line Items]
Debt instrument stated interest rate				6.00%
Debt instrument maturity year				2029
Common stock issued in exchange for convertible notes				12
Aggregate principal amount of convertible senior notes exchanged				$ 104,000,000
Secured Debt \| Performance Bonds
Debt Instrument [Line Items]
Credit facility expiration year			2019
Unsecured Debt \| 4.5% Senior Limited-Subordination Convertible Notes Due 2021
Debt Instrument [Line Items]
Debt instrument maturity year		2021
Debt instrument converted amount		$ 156,000,000
Debt instrument converted shares issued		5
Unsecured Debt \| 4.5% Convertible Notes Due 2015
Debt Instrument [Line Items]
Debt instrument stated interest rate	4.50%
Debt instrument maturity year	2015
Debt purchased and retired				28,000,000
Debt instrument conversion rate			18.93
Long-term Debt, Gross	$ 202,000,000
Common stock issued in exchange for convertible notes	11
Adjustment to additional paid in capital upon debt redemption				34,000,000
United Airlines, Inc.
Debt Instrument [Line Items]
Borrowed principal amount			$ 590,000,000
Long-term Debt, Gross			$ 11,042,000,000	11,533,000,000
Convertible debt derivative asset				712,000,000
Convertible debt option liability				511,000,000
Aggregate principal amount of convertible senior notes exchanged				$ 156,000,000
United Airlines, Inc. \| Minimum
Debt Instrument [Line Items]
Debt instrument maturity year			2025
United Airlines, Inc. \| Maximum
Debt Instrument [Line Items]
Debt instrument maturity year			2027
United Airlines, Inc. \| Revolving Credit Facility
Debt Instrument [Line Items]
Commitment fee percentage			0.75%
United Airlines, Inc. \| Letters of credit \| Cash Collateralized Letters of Credit
Debt Instrument [Line Items]
Credit facility outstanding amount			$ 70,000,000
United Airlines, Inc. \| Letter of Credit and Performance Bonds
Debt Instrument [Line Items]
Credit facility outstanding amount			437,000,000
United Airlines, Inc. \| Pass-through certificates
Debt Instrument [Line Items]
Long term debt			7,800,000,000
United Airlines, Inc. \| 6% Notes due 2026 and 2028
Debt Instrument [Line Items]
Write off of unamortized discount			$ 134,000,000
United Airlines, Inc. \| Secured Debt
Debt Instrument [Line Items]
Quarterly principal repayment amount			0.25%
United Airlines, Inc. \| Secured Debt \| Revolving Credit Facility
Debt Instrument [Line Items]
Credit agreement			$ 1,350,000,000
Available under revolving credit facility			1,350,000,000
United Airlines, Inc. \| Secured Debt \| Term Loan Facility Due April 2019
Debt Instrument [Line Items]
Credit agreement			900,000,000
Long term debt			$ 875,000,000
Debt instrument maturity date			Apr. 01, 2019
United Airlines, Inc. \| Secured Debt \| Term Loan Facility Due April 2019 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			2.75%
United Airlines, Inc. \| Secured Debt \| Term Loan Facility Due September 2021
Debt Instrument [Line Items]
Credit agreement			$ 500,000,000
Long term debt			$ 194,000,000
Debt instrument maturity date			Sep. 15, 2021
Debt instrument stated interest rate			3.00%
United Airlines, Inc. \| Secured Debt \| Revolving Credit Facility Available For Drawing until April 2018
Debt Instrument [Line Items]
Credit agreement			$ 1,350,000,000
Revolving credit facility available for drawing date			2018-04
United Airlines, Inc. \| Secured Debt \| Revolving Credit Facility Available For Drawing until January 2019
Debt Instrument [Line Items]
Credit agreement			$ 1,315,000,000
Revolving credit facility available for drawing date			2019-01
United Airlines, Inc. \| Secured Debt \| Term Loan \| Interest Rate Floor
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			0.75%
United Airlines, Inc. \| Secured Debt \| Term Loan, due 2021
Debt Instrument [Line Items]
Debt instrument maturity year			2021	2021
Long-term Debt, Gross			$ 194,000,000	$ 499,000,000
United Airlines, Inc. \| Secured Debt \| Term Loan, due 2021 \| LIBOR
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			3.00%	3.00%
United Airlines, Inc. \| Secured Debt \| Term Loan, due 2021 \| Interest Rate Floor
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			0.75%	0.75%
United Airlines, Inc. \| Secured Debt \| Term Loan, due 2021 \| Certain Market Interest Rates
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			2.00%	2.00%
United Airlines, Inc. \| Unsecured Debt \| 6% Notes due 2026
Debt Instrument [Line Items]
Debt instrument stated interest rate			6.00%
Debt instrument maturity year			2026
Debt purchased and retired			$ 321,000,000
United Airlines, Inc. \| Unsecured Debt \| 6% Notes Due 2028
Debt Instrument [Line Items]
Debt instrument stated interest rate			6.00%
Debt instrument maturity year			2028
Debt purchased and retired			$ 311,000,000
United Airlines, Inc. \| Unsecured Debt \| 4.5% Convertible Notes Due 2015
Debt Instrument [Line Items]
Debt instrument stated interest rate			4.50%	4.50%
Debt instrument maturity year			2015	2015
Long-term Debt, Gross				$ 202,000,000
Adjustment to additional paid in capital upon debt redemption				$ 62,000,000
Debt instrument convertible effective interest rate			4.50%

Details of Pass Through Trusts (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total debt recorded		$ 248
Proceeds received from issuance of debt	$ 1,073	1,432	$ 1,423
United Airlines, Inc.
Debt Instrument [Line Items]
Principal	590
Total debt recorded	11,042	11,533
Proceeds received from issuance of debt	1,073	$ 1,432	$ 1,423
United Airlines, Inc. \| Class AA Pass Through Certificates \| November 2015
Debt Instrument [Line Items]
Principal	$ 334
Final expected distribution date	2027-12
Stated interest rate	3.45%
Total debt recorded	$ 334
Proceeds received from issuance of debt	334
Remaining proceeds from issuance of debt to be received in future periods	0
United Airlines, Inc. \| Class A Pass Through Certificates \| November 2015
Debt Instrument [Line Items]
Principal	$ 100
Final expected distribution date	2022-12
Stated interest rate	3.70%
Total debt recorded	$ 100
Proceeds received from issuance of debt	100
Remaining proceeds from issuance of debt to be received in future periods	0
United Airlines, Inc. \| Class A Pass Through Certificates \| August 2014
Debt Instrument [Line Items]
Principal	$ 823
Final expected distribution date	2026-09
Stated interest rate	3.75%
Total debt recorded	$ 823
Proceeds received from issuance of debt	711
Remaining proceeds from issuance of debt to be received in future periods	0
United Airlines, Inc. \| Class B Pass Through Certificates \| August 2014
Debt Instrument [Line Items]
Principal	$ 238
Final expected distribution date	2022-09
Stated interest rate	4.625%
Total debt recorded	$ 238
Proceeds received from issuance of debt	206
Remaining proceeds from issuance of debt to be received in future periods	0
United Airlines, Inc. \| EETC
Debt Instrument [Line Items]
Principal	1,495
Total debt recorded	1,495
Proceeds received from issuance of debt	1,351
Remaining proceeds from issuance of debt to be received in future periods	$ 0

Summary of Collateral Covenants and Cross Default Provisions (Detail)	12 Months Ended
	Dec. 31, 2015
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, although the Company currently has ample ability under these restrictions to repurchase stock under the Company’s share repurchase program.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.
6.375% Senior Notes due 2018
Debt Instrument [Line Items]
Collateral, Covenants and Cross Default Provisions	The indentures for these notes 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, although the Company currently has ample ability under these restrictions to repurchase stock under the Company’s share repurchase program. The indentures contain events of default that are customary for similar financings.
Senior Notes 6% Due 2020
Debt Instrument [Line Items]
Collateral, Covenants and Cross Default Provisions	The indentures for these notes 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, although the Company currently has ample ability under these restrictions to repurchase stock under the Company’s share repurchase program. The indentures contain events of default that are customary for similar financings.

Summary of Collateral Covenants and Cross Default Provisions (Parenthetical) (Detail) $ in Billions	12 Months Ended
	Dec. 31, 2015 USD ($)
Credit Agreement
Debt Instrument [Line Items]
Unrestricted liquidity required for credit agreement	$ 3.0
Minimum ratio of appraised value of collateral for Credit Agreement	167.00%
6.375% Senior Notes 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

Advanced Purchase of Miles - Additional Information (Detail)	Dec. 31, 2015 USD ($)
United Airlines, Inc. \| Co-Brand Agreement \| Maximum \| Advanced Purchase of Miles
Airline Products and Services [Line Items]
Repurchase of pre-purchased miles from Chase in 2016	$ 249,000,000

Future Minimum Lease Payments for Capital and Operating Leases (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Capital Leases
2016	$ 206
2017	162
2018	151
2019	86
2020	66
After 2020	747
Minimum lease payments	1,418
Imputed interest	(556)
Present value of minimum lease payments	862
Current portion	(135)	$ (110)
Long-term obligations under capital leases	727	$ 571
Present value of minimum lease payments	862
Facility and Other Operating Leases
Operating Leases
2016	1,252
2017	1,161
2018	899
2019	809
2020	920
After 2020	6,799
Minimum lease payments	11,840
Aircraft Operating Leases
Operating Leases
2016	1,317
2017	1,317
2018	1,100
2019	918
2020	708
After 2020	2,660
Minimum lease payments	$ 8,020

Leases and Capacity Purchase Agreements - (Capital Leases) - Additional Information (Detail) - United Airlines, Inc.	12 Months Ended
	Dec. 31, 2015 Aircraft
Minimum
Capital Leased Assets [Line Items]
Imputed interest rate	3.50%
Maximum
Capital Leased Assets [Line Items]
Imputed interest rate	20.80%
Mainline
Capital Leased Assets [Line Items]
Number of assets subject to lease	47
Regional Carrier
Capital Leased Assets [Line Items]
Number of assets subject to lease	29

Leases and Capacity Purchase Agreements - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) Aircraft	Dec. 31, 2014 USD ($) Aircraft	Dec. 31, 2013 USD ($)
Operating Leased Assets [Line Items]
Regional capacity purchase expense \| $		$ 2,290	$ 2,344	$ 2,419
Scenario Forecast \| Capacity Purchase Agreements
Operating Leased Assets [Line Items]
Scheduled block hours increase (decrease) percentage	10.00%
Change in cash obligation \| $	$ 144
Cash obligation increase (decrease) percentage	7.90%
Aircraft Operating Leases
Operating Leased Assets [Line Items]
Operating leases obligations \| $		$ 8,020
Facility and Other Operating Leases
Operating Leased Assets [Line Items]
Operating lease extended expiration year		2041
Operating leases obligations \| $		$ 11,840
Minimum \| Aircraft Operating Leases
Operating Leased Assets [Line Items]
Operating lease term		5 years
Operating lease expiration date, in years		2016
Maximum \| Aircraft Operating Leases
Operating Leased Assets [Line Items]
Operating lease term		26 years
Operating lease expiration date, in years		2024
CommutAir \| Embraer ERJ145 Aircraft \| Capacity Purchase Arrangement
Operating Leased Assets [Line Items]
Number of aircraft operated		40
CommutAir \| Minimum \| Embraer ERJ145 Aircraft \| Capacity Purchase Arrangement
Operating Leased Assets [Line Items]
Used aircraft, scheduled transfer start date		2015-12
CommutAir \| Maximum \| Embraer ERJ145 Aircraft \| Capacity Purchase Arrangement
Operating Leased Assets [Line Items]
Used aircraft, scheduled transfer end date		2017
AerCap Holdings N.V. \| A319 aircraft \| Capital Addition Purchase Commitments
Operating Leased Assets [Line Items]
Number of used aircraft expected to be delivered over the next two years beginning in early 2016		11
AerCap Holdings N.V. \| Maximum \| A319 aircraft \| Capital Addition Purchase Commitments
Operating Leased Assets [Line Items]
Number of used aircraft expected to be delivered over the next five years		14
United Airlines, Inc.
Operating Leased Assets [Line Items]
Nonaircraft rent expense \| $		$ 1,300	1,400	1,300
Regional capacity purchase expense \| $		2,290	2,344	2,419
United Airlines, Inc. \| Regional Aircraft
Operating Leased Assets [Line Items]
Regional capacity purchase expense \| $		461	442	428
United Airlines, Inc. \| Revaluation of Liabilities
Operating Leased Assets [Line Items]
Net accretion amounts \| $		$ 107	$ 160	$ 173
United Airlines, Inc. \| Capacity Purchase Agreements
Operating Leased Assets [Line Items]
Number of aircraft operated		521
Airline capacity purchase arrangements, expiration year		2029
United Airlines, Inc. \| Variable Interest Entity, Not Primary Beneficiary
Operating Leased Assets [Line Items]
Operating leases obligations \| $		$ 1,500
United Airlines, Inc. \| Aircraft Operating Leases
Operating Leased Assets [Line Items]
Number of aircraft operated		113
United Airlines, Inc. \| Aircraft Operating Leases \| Embraer E170 Aircraft \| Extension of Term
Operating Leased Assets [Line Items]
Number of aircraft operated		38	38
United Airlines, Inc. \| Aircraft Operating Leases \| Embraer E175 Aircraft \| New Lease Arrangement
Operating Leased Assets [Line Items]
Number of aircraft operated		40	40
United Airlines, Inc. \| Aircraft Operating Leases \| Q400 aircraft
Operating Leased Assets [Line Items]
Number of aircraft operated		13	13
United Airlines, Inc. \| Aircraft Leases \| Embraer E175 Aircraft
Operating Leased Assets [Line Items]
Number of aircraft right to acquire		40
United Airlines, Inc. \| Minimum
Operating Leased Assets [Line Items]
Lease Fair Value Adjustment, Remaining Lease Term		1 year
United Airlines, Inc. \| Minimum \| Capital Addition Purchase Commitments
Operating Leased Assets [Line Items]
New aircraft, scheduled delivery date		2016
United Airlines, Inc. \| Minimum \| Aircraft Leases \| Embraer E175 Aircraft
Operating Leased Assets [Line Items]
New aircraft, scheduled delivery date		2016
United Airlines, Inc. \| Maximum
Operating Leased Assets [Line Items]
Lease Fair Value Adjustment, Remaining Lease Term		9 years
United Airlines, Inc. \| Maximum \| Capital Addition Purchase Commitments
Operating Leased Assets [Line Items]
New aircraft, scheduled delivery date		2024
United Airlines, Inc. \| Maximum \| Aircraft Leases \| Embraer E175 Aircraft
Operating Leased Assets [Line Items]
New aircraft, scheduled delivery date		2017
SkyWest \| Embraer E175 Aircraft \| Capacity Purchase Arrangement \| Capital Addition Purchase Commitments
Operating Leased Assets [Line Items]
Number of aircraft operated		25
SkyWest \| Minimum \| Embraer E175 Aircraft \| Capacity Purchase Arrangement \| Capital Addition Purchase Commitments
Operating Leased Assets [Line Items]
New aircraft, scheduled delivery date		2016
SkyWest \| Maximum \| Embraer E175 Aircraft \| Capacity Purchase Arrangement \| Capital Addition Purchase Commitments
Operating Leased Assets [Line Items]
New aircraft, scheduled delivery date		2017
Mesa \| Embraer E175 Aircraft \| Capacity Purchase Arrangement \| Capital Addition Purchase Commitments
Operating Leased Assets [Line Items]
New aircraft, scheduled delivery date		2016
Number of aircraft to be acquired		15
Mesa \| Embraer E175 Aircraft \| At the time of each aircraft's delivery, subject to certain conditions \| Capacity Purchase Arrangement \| Capital Addition Purchase Commitments
Operating Leased Assets [Line Items]
Number of aircraft to be acquired		10
Mesa \| Embraer E175 Aircraft \| Aircrafts directly purchased from Embraer \| Capacity Purchase Arrangement \| Capital Addition Purchase Commitments
Operating Leased Assets [Line Items]
Number of aircraft to be acquired		5

Future Lease Payment Under Terms of Capacity Purchase Agreement (Detail) $ in Millions	Dec. 31, 2015 USD ($)
Long-term Purchase Commitment [Line Items]
2016	$ 1,834
2017	1,884
2018	1,550
2019	1,290
2020	1,155
After 2020	4,932
Contractual Obligation, Total	$ 12,645

Variable Interest Entities - Additional Information (Detail) - Variable Interest Entity, Not Primary Beneficiary	Dec. 31, 2015 Aircraft
Mainline
Variable Interest Entity [Line Items]
Aircraft under operating lease, fixed purchase options	47
Regional Carrier
Variable Interest Entity [Line Items]
Aircraft under operating lease	207

Schedule of Commitments to Purchase Aircrafts (Detail) - United Airlines, Inc. - Capital Addition Purchase Commitments

Dec. 31, 2015

Aircraft

^[1]

Boeing 737NG/737 MAX 9 Aircraft

Boeing 777-300ER Aircraft

155

Boeing 787-8/-9/-10 Aircraft

Embraer E175 Aircraft

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

Commitments and Contingencies - Additional Information (Detail) Employee in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Employee Option	Dec. 31, 2014 USD ($)
Commitments and Contingencies [Line Items]
Debt instrument principal amount		$ 248,000,000
Number of call options to purchase regional jet aircraft \| Option	279
Tax-exempt special facilities revenue bonds
Commitments and Contingencies [Line Items]
Guarantor obligations, maximum exposure	$ 1,900,000,000
Operating leases obligations	1,500,000,000
Capital leases obligations	302,000,000
Tax-exempt special facilities revenue bonds \| Indirect Guarantee of Indebtedness
Commitments and Contingencies [Line Items]
Guarantor obligations, maximum exposure	224,000,000
Contingent liabilities based on participation	1,300,000,000
Floating Rate Debt
Commitments and Contingencies [Line Items]
Debt instrument principal amount	2,400,000,000
Fixed Rate Debt
Commitments and Contingencies [Line Items]
Debt instrument principal amount	118,000,000
Loans And Leases From Non U S Entities
Commitments and Contingencies [Line Items]
Debt instrument principal amount	$ 2,400,000,000
Minimum \| Tax-exempt special facilities revenue bonds
Commitments and Contingencies [Line Items]
Debt instrument maturity year	2017
Minimum \| Tax-exempt special facilities revenue bonds \| Indirect Guarantee of Indebtedness
Commitments and Contingencies [Line Items]
Debt instrument maturity year	2017
Maximum
Commitments and Contingencies [Line Items]
Debt instrument, remaining terms (years)	12 years
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)	12 years
United Airlines, Inc.
Commitments and Contingencies [Line Items]
Debt instrument principal amount	$ 11,042,000,000	$ 11,533,000,000
Number of employees \| Employee	84
Percentage of employees represented by various U.S. labor organizations	80.00%
United Airlines, Inc. \| Minimum
Commitments and Contingencies [Line Items]
Debt instrument maturity year	2025
United Airlines, Inc. \| Maximum
Commitments and Contingencies [Line Items]
Debt instrument maturity year	2027
Capital Addition Purchase Commitments \| United Airlines, Inc. \| Minimum
Commitments and Contingencies [Line Items]
New aircraft, scheduled delivery date	2016
Capital Addition Purchase Commitments \| United Airlines, Inc. \| Maximum
Commitments and Contingencies [Line Items]
New aircraft, scheduled delivery date	2024

Schedule of Acquisition of Aircrafts and Related Spare Engines (Detail) $ in Billions	Dec. 31, 2015 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
2016	$ 3.4
2017	3.1
2018	3.3
2019	2.9
2020	2.8
After 2020	7.7
Total commitments	$ 23.2

Components of Special Items (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating:
Severance and benefit costs	$ 4	$ 28	$ 25	$ 50	$ 141	$ 6	$ 38	$ 14	$ 107	$ 199	$ 105
Impairment of assets	48	18	11	2	16		32	1	79	49	33
Integration-related costs	13	15	14	18	17	28	17	34	60	96	205
Labor agreement costs									18		127
(Gains) losses on sale of assets and other miscellaneous (gains) losses, net	66	15	5	(6)	5	9	16	3	62	99	50
Special charges	131	76	55	64	179	43	169	52	326	443	520
Nonoperating and income taxes:
Loss on extinguishment of debt and other, net	7	61	128	6	53			21	202	74
Income tax benefit related to special charges	(11)				(6)	(3)		(1)	(11)	(10)	(7)
Income tax benefit associated with valuation allowance release (Note 7)	88	(3,218)							(3,130)
Total operating and nonoperating special charges, net of income taxes	$ 215	$ (3,081)	$ 183	$ 70	$ 226	$ 40	$ 169	$ 72	$ (2,613)	$ 507	$ 513

Special Items - Additional Information (Detail)	3 Months Ended								12 Months Ended
Special Items - Additional Information (Detail)	Dec. 31, 2015 USD ($) / $	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) / $	Dec. 31, 2014 USD ($) Aircraft Attendant	Dec. 31, 2013 USD ($) Aircraft Employee
Special Charges [Line Items]
Severance and benefits	$ 4,000,000	$ 28,000,000	$ 25,000,000	$ 50,000,000	$ 141,000,000	$ 6,000,000	$ 38,000,000	$ 14,000,000	$ 107,000,000	$ 199,000,000	$ 105,000,000
Impairment of indefinite-lived intangible assets									33,000,000	16,000,000	1,000,000
Impairment of indefinite-lived intangible assets, net of tax benefits									22,000,000	10,000,000
Costs associated with aircraft							66,000,000		8,000,000	66,000,000
Inventory held for sale	7,000,000								7,000,000
Impairment for discontinued internal software projects									10,000,000
Impairment charges of equipment held for disposal									10,000,000
Charges for legal matters									32,000,000
Collective bargaining agreements									18,000,000		127,000,000
Cease use of an aircraft under lease									16,000,000		5,000,000
(Gains) losses on sale of assets and other miscellaneous (gains) losses, net	$ 66,000,000	15,000,000	5,000,000	(6,000,000)	5,000,000	$ 9,000,000	$ 16,000,000	3,000,000	62,000,000	99,000,000	$ 50,000,000
Venezuela local currency loss									$ 61,000,000
Foreign currency exchange rate per US dollar, description									200 Venezuelan bolivars to one U.S. dollar
Foreign currency exchange rate \| / $	200								200
Loss on extinguishment of debt and other, net	$ 7,000,000	$ 61,000,000	$ 128,000,000	$ 6,000,000	53,000,000			$ 21,000,000	$ 202,000,000	$ 74,000,000
Number of positions eliminated \| Employee											1,200
Number of leased aircraft \| Aircraft										21
Lease expiry year										2018
Debt instrument principal amount					$ 248,000,000					$ 248,000,000
Adjustment of reserves for certain legal matters											$ 29,000,000
Loss on sale of asset											3,000,000
Unsecured Debt
Special Charges [Line Items]
Venezuela local currency loss										10,000,000
Loss on extinguishment of debt and other, net										64,000,000
International Association of Machinists
Special Charges [Line Items]
Collective bargaining agreements											127,000,000
Cleveland
Special Charges [Line Items]
Severance and benefits										$ 58,000,000
6% Convertible Junior Subordinated Debentures
Special Charges [Line Items]
Debt instrument stated interest rate					6.00%					6.00%
6% Convertible preferred securities
Special Charges [Line Items]
Debt instrument stated interest rate					6.00%					6.00%
United Airlines, Inc.
Special Charges [Line Items]
Debt instrument principal amount	11,042,000,000				$ 11,533,000,000				11,042,000,000	$ 11,533,000,000
United Airlines, Inc. \| 6% Notes due 2026 and 2028
Special Charges [Line Items]
Write off of unamortized discount									134,000,000
Boeing 737-300 and 737-500 fleets
Special Charges [Line Items]
Impairment charges of equipment held for disposal										33,000,000	32,000,000
Temporarily grounded Boeing 787 aircraft
Special Charges [Line Items]
Costs associated with aircraft											18,000,000
Venezuelan bolivars
Special Charges [Line Items]
Unrestricted cash balance held as Venezuelan bolivars	$ 13,000,000								$ 13,000,000
Scenario, Previously Reported
Special Charges [Line Items]
Foreign currency exchange rate per US dollar, description									13.5 Venezuelan bolivars to one U.S. dollar
Foreign currency exchange rate \| / $	13.5								13.5
Voluntary early out program
Special Charges [Line Items]
Severance and benefits										$ 141,000,000
Number of positions eliminated \| Attendant										2,500
Number of positions eliminated \| Attendant										2,500
Voluntary early out program \| Maximum
Special Charges [Line Items]
Severance payment per participant	$ 100,000				$ 100,000				$ 100,000	$ 100,000
Integration Related
Special Charges [Line Items]
(Gains) losses on sale of assets and other miscellaneous (gains) losses, net									$ 14,000,000	$ 33,000,000
Voluntary retirement program
Special Charges [Line Items]
Severance and benefits											$ 64,000,000
Number of leased aircraft \| Aircraft											4
Accruals for future rent											$ 11,000,000
Voluntary Leave of Absence Program
Special Charges [Line Items]
Severance and benefits											26,000,000
Involuntary severance programs
Special Charges [Line Items]
Severance and benefits											$ 15,000,000

Accrual Activity (Detail) - USD ($) $ in Millions	12 Months Ended
Accrual Activity (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Severance and Benefits
Schedule Of Accrual Activity [Line Items]
Beginning Balance	$ 109	$ 91	$ 65
Accrual	107	199	120
Payments	(189)	(181)	(94)
Ending Balance	27	109	91
Permanently Grounded Aircraft
Schedule Of Accrual Activity [Line Items]
Beginning Balance	102	11	5
Accrual	30	102	10
Payments	(54)	(11)	(4)
Ending Balance	$ 78	$ 102	$ 11

Segment Information - Additional Information (Detail)	12 Months Ended
Segment Information - Additional Information (Detail)	Dec. 31, 2015 Segment
Segment Reporting Information [Line Items]
Number of Operating Segments	1

Operating Revenue by Principle Geographic Region (Detail) - USD ($)
$ in Millions

3 Months Ended

12 Months Ended

Dec. 31, 2015

Sep. 30, 2015

Jun. 30, 2015

Mar. 31, 2015

Dec. 31, 2014

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Domestic (U.S. and Canada)

$ 9,036

$ 10,306

$ 9,914

$ 8,608

$ 9,313

$ 10,563

$ 10,329

$ 8,696

$ 37,864

$ 38,901

$ 38,279

^[1]

21,931

22,320

22,092

Pacific

5,498

5,767

5,794

Atlantic

7,068

7,321

7,132

Latin America

Selected Quarterly Financial Data [Line Items]

$ 3,367

$ 3,493

$ 3,261

[1]	UAL and United amounts are substantially the same.

Schedule of Selected Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Millions

3 Months Ended

12 Months Ended

Dec. 31, 2015

Sep. 30, 2015

Jun. 30, 2015

Mar. 31, 2015

Dec. 31, 2014

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Operating revenue

$ 9,036

$ 10,306

$ 9,914

$ 8,608

$ 9,313

$ 10,563

$ 10,329

$ 8,696

$ 37,864

$ 38,901

$ 38,279

^[1]

Income (loss) from operations

1,081

1,899

1,445

741

625

1,191

906

(349)

5,166

2,373

1,249

Net income (loss)

$ 823

$ 4,816

$ 1,193

$ 508

$ 28

$ 924

$ 789

$ (609)

$ 7,340

$ 1,132

$ 571

Basic earnings (loss) per share

$ 2.24

$ 12.83

$ 3.14

$ 1.33

$ 0.08

$ 2.49

$ 2.11

$ (1.66)

$ 19.52

$ 3.05

$ 1.64

Diluted earnings (loss) per share

$ 2.24

$ 12.82

$ 3.14

$ 1.32

$ 0.07

$ 2.37

$ 2.01

$ (1.66)

$ 19.47

$ 2.93

$ 1.53

[1]	UAL and United amounts are substantially the same.

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.

Valuation allowance for deferred tax assets

Schedule of Effect of Four Quarters Events (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating:
Severance and benefit costs	$ 4	$ 28	$ 25	$ 50	$ 141	$ 6	$ 38	$ 14	$ 107	$ 199	$ 105
Impairment of assets	48	18	11	2	16		32	1	79	49	33
Integration-related costs	13	15	14	18	17	28	17	34	60	96	205
Costs associated with permanently grounding Embraer ERJ 135 aircraft							66		8	66
(Gains) losses on sale of assets and other miscellaneous (gains) losses, net	66	15	5	(6)	5	9	16	3	62	99	50
Special charges	131	76	55	64	179	43	169	52	326	443	520
Nonoperating and income taxes:
Loss on extinguishment of debt and other, net	7	61	128	6	53			21	202	74
Income tax benefit related to special charges	(11)				(6)	(3)		(1)	(11)	(10)	(7)
Income tax expense (benefit) associated with valuation allowance release	88	(3,218)							(3,130)
Total operating and nonoperating special charges, net of income taxes	$ 215	$ (3,081)	$ 183	$ 70	$ 226	$ 40	$ 169	$ 72	$ (2,613)	$ 507	$ 513

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

12 Months Ended

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Valuation and Qualifying Accounts Disclosure [Line Items]

$ 4,751

$ 4,591

$ 5,388

156

^[1]

4,703

888

^[2]

UAL and United | Allowance for doubtful accounts

4,751

4,591

Valuation and Qualifying Accounts Disclosure [Line Items]

^[1]

UAL and United | Obsolescence allowance-spare parts

Valuation and Qualifying Accounts Disclosure [Line Items]

169

162

125

^[1]

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

235

169

162

Valuation and Qualifying Accounts Disclosure [Line Items]

4,721

4,561

5,288

167

^[1]

4,673

898

^[2]

(7)

163