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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2013	Jul. 15, 2013
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Trading Symbol	UAL
Entity Registrant Name	United Continental Holdings, Inc.
Entity Central Index Key	0000100517
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		355,903,723
United Airlines, Inc.
Document Information [Line Items]
Entity Registrant Name	United Airlines, Inc.
Entity Central Index Key	0000319687
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		1,000

Statements of Consolidated Operations - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Operating revenue:
Passenger-Mainline	$ 6,829	$ 6,944	$ 12,767	$ 12,898
Passenger-Regional	1,839	1,824	3,460	3,378
Total passenger revenue	8,668	8,768	16,227	16,276
Cargo	236	265	463	529
Other operating revenue	1,097	906	2,032	1,736
Total revenue	10,001	9,939	18,722	18,541
Operating expense:
Aircraft fuel	3,068	3,408	6,118	6,637
Salaries and related costs	2,175	2,024	4,302	3,921
Regional capacity purchase	628	643	1,216	1,259
Landing fees and other rent	507	503	1,004	972
Aircraft maintenance materials and outside repairs	480	432	918	839
Depreciation and amortization	425	378	833	758
Distribution expenses	347	345	675	682
Aircraft rent	235	251	475	502
Special charges	52	206	144	370
Other operating expenses	1,314	1,174	2,531	2,297
Total operating expenses	9,231	9,364	18,216	18,237
Operating income	770	575	506	304
Nonoperating income (expense):
Interest expense	(194)	(213)	(395)	(429)
Interest capitalized	12	9	23	17
Interest income	6	7	11	12
Miscellaneous, net	(123)	(38)	(100)	(11)
Total other income (expense)	(299)	(235)	(461)	(411)
Income (loss) before income taxes	471	340	45	(107)
Income tax expense (benefit)	2	1	(7)	2
Net income (loss)	$ 469	$ 339	$ 52	$ (109)
Earnings (loss) per share, basic	$ 1.37	$ 1.02	$ 0.15	$ (0.33)
Earnings (loss) per share, diluted	$ 1.21	$ 0.89	$ 0.15	$ (0.33)
United Airlines, Inc.
Operating revenue:
Passenger-Mainline	$ 6,829	$ 6,944	$ 12,767	$ 12,898
Passenger-Regional	1,839	1,824	3,460	3,378
Total passenger revenue	8,668	8,768	16,227	16,276
Cargo	236	265	463	529
Other operating revenue	1,099	907	2,036	1,739
Total revenue	10,003	9,940	18,726	18,544
Operating expense:
Aircraft fuel	3,068	3,408	6,118	6,637
Salaries and related costs	2,175	2,024	4,302	3,921
Regional capacity purchase	628	643	1,216	1,259
Landing fees and other rent	507	503	1,004	972
Aircraft maintenance materials and outside repairs	480	432	918	839
Depreciation and amortization	425	378	833	758
Distribution expenses	347	345	675	682
Aircraft rent	235	251	475	502
Special charges	52	206	144	370
Other operating expenses	1,313	1,173	2,530	2,295
Total operating expenses	9,230	9,363	18,215	18,235
Operating income	773	577	511	309
Nonoperating income (expense):
Interest expense	(188)	(216)	(391)	(433)
Interest capitalized	12	9	23	17
Interest income	6	7	11	12
Miscellaneous, net	(117)	(7)	(32)	35
Total other income (expense)	(287)	(207)	(389)	(369)
Income (loss) before income taxes	486	370	122	(60)
Income tax expense (benefit)	2	1		2
Net income (loss)	$ 484	$ 369	$ 122	$ (62)

Statements of Consolidated Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net income (loss)	$ 469	$ 339	$ 52	$ (109)
Other comprehensive income (loss), net:
Net change related to fuel derivative financial instruments	(10)	(224)	(10)	(100)
Net change related to employee benefit plans	459	5	480	9
Net change related to investments and other	9		7	9
Comprehensive income (loss) adjustments, before tax	458	(219)	477	(82)
Total comprehensive income (loss), net	927	120	529	(191)
United Airlines, Inc.
Net income (loss)	484	369	122	(62)
Other comprehensive income (loss), net:
Net change related to fuel derivative financial instruments	(10)	(224)	(10)	(100)
Net change related to employee benefit plans	459	5	480	9
Net change related to investments and other	9	(1)	8	9
Other			6
Comprehensive income (loss) adjustments, before tax	458	(220)	484	(82)
Total comprehensive income (loss), net	$ 942	$ 149	$ 606	$ (144)

- Definition

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

+ References

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

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+ Details

Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 4,143	$ 4,770
Short-term investments	1,821	1,773
Total unrestricted cash, cash equivalents and short-term investments	5,964	6,543
Restricted cash	40	65
Receivables, less allowance for doubtful accounts	1,732	1,338
Aircraft fuel, spare parts and supplies, less obsolescence allowance	555	695
Deferred income taxes	540	543
Prepaid expenses and other	790	865
Total current assets	9,621	10,049
Operating property and equipment: Owned-
Flight equipment	18,145	17,561
Other property and equipment	3,527	3,269
Operating property and equipment - owned, gross	21,672	20,830
Less - Accumulated depreciation and amortization	(5,638)	(5,006)
Operating property and equipment - owned, net	16,034	15,824
Purchase deposits for flight equipment	610	462
Capital leases-
Flight equipment	1,489	1,484
Other property and equipment	235	235
Operating property and equipment - capital leases, gross	1,724	1,719
Less - Accumulated amortization	(784)	(713)
Operating property and equipment - capital leases, net	940	1,006
Total property, plant, and equipment, net	17,584	17,292
Other assets:
Goodwill	4,523	4,523
Intangibles, less accumulated amortization	4,523	4,597
Restricted cash	395	382
Other, net	822	785
Other assets total	10,263	10,287
Total assets	37,468	37,628
Current liabilities:
Advance ticket sales	4,801	3,360
Frequent flyer deferred revenue	2,343	2,364
Accounts payable	2,298	2,312
Accrued salaries and benefits	1,480	1,763
Current maturities of long-term debt	909	1,812
Current maturities of capital leases	119	122
Other	977	1,085
Total current liabilities	12,927	12,818
Long-term debt	10,214	10,440
Long-term obligations under capital leases	724	792
Other liabilities and deferred credits:
Frequent flyer deferred revenue	2,644	2,756
Postretirement benefit liability	2,642	2,614
Pension liability	1,937	2,400
Advanced purchase of miles	1,438	1,537
Deferred income taxes	1,542	1,543
Lease fair value adjustment, net	791	881
Other	1,392	1,366
Total non-current liabilities	12,386	13,097
Commitments and contingencies
Stockholder's equity:
Preferred stock
Common stock	4	3
Additional capital invested	7,354	7,145
Accumulated deficit	(5,534)	(5,586)
Stock held in treasury, at cost	(38)	(35)
Accumulated other comprehensive loss	(569)	(1,046)
Total stockholders' equity	1,217	481
Total liabilities and stockholders' equity (deficit)	37,468	37,628
United Airlines, Inc.
Current assets:
Cash and cash equivalents	4,137	4,765
Short-term investments	1,821	1,773
Total unrestricted cash, cash equivalents and short-term investments	5,958	6,538
Restricted cash	40	65
Receivables from related parties	229	226
Receivables, less allowance for doubtful accounts	1,732	1,338
Aircraft fuel, spare parts and supplies, less obsolescence allowance	555	695
Deferred income taxes	546	546
Prepaid expenses and other	777	841
Total current assets	9,837	10,249
Operating property and equipment: Owned-
Flight equipment	18,145	17,561
Other property and equipment	3,527	3,269
Operating property and equipment - owned, gross	21,672	20,830
Less - Accumulated depreciation and amortization	(5,638)	(5,006)
Operating property and equipment - owned, net	16,034	15,824
Purchase deposits for flight equipment	610	462
Capital leases-
Flight equipment	1,489	1,484
Other property and equipment	235	235
Operating property and equipment - capital leases, gross	1,724	1,719
Less - Accumulated amortization	(784)	(713)
Operating property and equipment - capital leases, net	940	1,006
Total property, plant, and equipment, net	17,584	17,292
Other assets:
Goodwill	4,523	4,523
Intangibles, less accumulated amortization	4,523	4,597
Restricted cash	395	382
Other, net	1,215	1,052
Other assets total	10,656	10,554
Total assets	38,077	38,095
Current liabilities:
Advance ticket sales	4,801	3,360
Frequent flyer deferred revenue	2,343	2,364
Accounts payable	2,302	2,316
Accrued salaries and benefits	1,480	1,763
Current maturities of long-term debt	909	1,812
Current maturities of capital leases	119	122
Payables to related parties	47	75
Other	1,043	1,140
Total current liabilities	13,044	12,952
Long-term debt	10,007	10,038
Long-term obligations under capital leases	724	792
Other liabilities and deferred credits:
Frequent flyer deferred revenue	2,644	2,756
Postretirement benefit liability	2,642	2,614
Pension liability	1,937	2,400
Advanced purchase of miles	1,438	1,537
Deferred income taxes	1,472	1,470
Lease fair value adjustment, net	791	881
Other	1,591	1,494
Total non-current liabilities	12,515	13,152
Commitments and contingencies
Stockholder's equity:
Additional capital invested	7,631	7,611
Accumulated deficit	(5,275)	(5,397)
Accumulated other comprehensive loss	(569)	(1,053)
Total stockholders' equity	1,787	1,161
Total liabilities and stockholders' equity (deficit)	$ 38,077	$ 38,095

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2013	Dec. 31, 2012
Receivables, allowance for doubtful accounts	$ 21	$ 13
Aircraft fuel, spare parts and supplies, obsolescence allowance	145	125
Intangibles, accumulated amortization	$ 864	$ 792
Common stock, par value	$ 0.01	$ 0.01
Common shares, authorized	1,000,000,000	1,000,000,000
Common shares, outstanding	355,889,762	332,472,779
United Airlines, Inc.
Receivables, allowance for doubtful accounts	$ 21	$ 13
Aircraft fuel, spare parts and supplies, obsolescence allowance	145	125
Intangibles, accumulated amortization	$ 864	$ 792
Common stock, par value	$ 0.01	$ 0.01
Common shares, authorized	1,000	1,000
Common shares, issued	1,000	1,000
Common shares, outstanding	1,000	1,000

Statements of Consolidated Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash Flows from Operating Activities:
Net cash provided by operating activities	$ 1,541	$ 1,083
Cash Flows from Investing Activities:
Capital expenditures and aircraft purchase deposits paid	(821)	(619)
Increase in short-term and other investments, net	(41)	(96)
Proceeds from sale of property and equipment	17	145
(Increase) decrease in restricted cash, net	12	(5)
Net cash used in investing activities	(833)	(575)
Cash Flows from Financing Activities:
Payments of long-term debt	(1,737)	(696)
Proceeds from issuance of long-term debt	520	86
Principal payments under capital leases	(73)	(64)
Other, net	(45)	6
Net cash used in financing activities	(1,335)	(668)
Net decrease in cash and cash equivalents	(627)	(160)
Cash and cash equivalents at beginning of the period	4,770	6,246
Cash and cash equivalents at end of the period	4,143	6,086
Investing and Financing Activities Not Affecting Cash:
Net property and equipment acquired through the issuance of debt	225	341
Exchanges of certain 6% convertible senior notes for common stock (Note 3)	189
Airport construction financing	29	27
8% Contingent Senior Unsecured Notes, net of discount		48
United Airlines, Inc.
Cash Flows from Operating Activities:
Net cash provided by operating activities	1,538	1,081
Cash Flows from Investing Activities:
Capital expenditures and aircraft purchase deposits paid	(821)	(619)
Increase in short-term and other investments, net	(41)	(96)
Proceeds from sale of property and equipment	16	145
(Increase) decrease in restricted cash, net	12	(5)
Net cash used in investing activities	(834)	(575)
Cash Flows from Financing Activities:
Payments of long-term debt	(1,737)	(696)
Proceeds from issuance of long-term debt	520	86
Principal payments under capital leases	(73)	(64)
Other, net	(42)	8
Net cash used in financing activities	(1,332)	(666)
Net decrease in cash and cash equivalents	(628)	(160)
Cash and cash equivalents at beginning of the period	4,765	6,240
Cash and cash equivalents at end of the period	4,137	6,080
Investing and Financing Activities Not Affecting Cash:
Net property and equipment acquired through the issuance of debt	225	341
Airport construction financing	$ 29	27
8% Contingent Senior Unsecured Notes, net of discount		$ 48

Statements of Consolidated Cash Flows (Parenthetical)	Jun. 30, 2013	Jun. 30, 2012
Debt instrument stated interest rate	8.00%	8.00%
6% Convertible Senior Notes
Debt instrument stated interest rate	6.00%	6.00%
United Airlines, Inc.
Debt instrument stated interest rate	8.00%	8.00%

Frequent Flyer Accounting

6 Months Ended

Jun. 30, 2013

Frequent Flyer Accounting

NOTE 1—FREQUENT FLYER ACCOUNTING

Frequent Flyer Awards. The Company revised the estimated selling price of miles as a prospective change in estimate, effective January 1, 2012, based on the price at which the Company sells miles to Star Alliance partners in its reciprocal frequent flyer agreements as the best estimate of the selling price for these miles. Any changes to the composition of Star Alliance airline partners could result in a change to the amount and method we use to determine the estimated selling price. On February 14, 2013, US Airways Group, Inc. announced an agreement to merge with AMR Corporation and its intent to exit Star Alliance as a result of such merger. We are currently evaluating the potential impact of any changes to the estimated selling price of miles as a result of this merger.

New Accounting Pronouncements

6 Months Ended

Jun. 30, 2013

New Accounting Pronouncements

NOTE 2—NEW ACCOUNTING PRONOUNCEMENTS

In February 2013, the Financial Accounting Standards Board issued Accounting Standards Update No. 2013-02 (“ASU 2013-02”), Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. Some of the key amendments require the Company to present, either on the face of the statement of operations or in the notes, the effects on the line items of net income of significant amounts reclassified out of accumulated other comprehensive income, but only if the amount reclassified is required under U.S. GAAP to be reclassified to net income in its entirety in the same reporting period. For amounts that are not required to be reclassified in their entirety to net income, the Company is required to cross-reference to other disclosures that provide additional detail about those amounts. ASU 2013-02 became effective for the Company’s annual and interim periods beginning January 1, 2013, and the required disclosures are included in Note 11 of this report.

- Definition

The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6507316

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6510796

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-Subparagraph 6
-Article 10

+ Details

Earnings (Loss) Per Share

6 Months Ended

Jun. 30, 2013

Earnings (Loss) Per Share

NOTE 3—EARNINGS (LOSS) PER SHARE

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


	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013		2012
Basic earnings (loss) per share:
Net income (loss)	$	469		$	339		$	52	$	(109	)
Less: Income allocable to participating securities		(1	)		(1	)		—		—

Earnings (loss) available to common stockholders	$	468		$	338		$	52	$	(109	)

Basic weighted average shares outstanding		341			331			337		331

Earnings (loss) per share, basic	$	1.37		$	1.02		$	0.15	$	(0.33	)

Diluted earnings (loss) per share:
Earnings (loss) available to common stockholders	$	468		$	338		$	52	$	(109	)
Effect of convertible notes		11			11			—		—

Earnings (loss) available to common stockholders including the effect of dilutive securities	$	479		$	349		$	52	$	(109	)

Diluted shares outstanding:
Basic weighted-average shares outstanding		341			331			337		331
Effect of convertible notes		53			61			—		—
Effect of employee stock options		—			1			—		—

Diluted weighted-average shares outstanding		394			393			337		331

Earnings (loss) per share, diluted	$	1.21		$	0.89		$	0.15	$	(0.33	)

Potentially dilutive shares excluded from diluted per share amounts:
Restricted stock and stock options		3			5			3		7
Convertible notes		—			—			57		61

During the second quarter of 2013, UAL issued approximately 22 million shares of UAL common stock pursuant to agreements that UAL entered into with certain of its securityholders in exchange for approximately $189 million in aggregate principal amount of UAL’s outstanding 6% convertible senior notes due 2029 held by such securityholders. The newly issued shares of UAL common stock are included in the determination of basic weighted average shares outstanding for the three and six months ended June 30, 2013. The Company retired the 6% convertible senior notes acquired in the exchange.

Income Taxes

6 Months Ended

Jun. 30, 2013

Income Taxes

NOTE 4—INCOME TAXES

Our effective tax rates are lower than the federal statutory rate of 35% primarily because of the impact of changes to existing valuation allowances. We continue to provide a valuation allowance for our deferred tax assets in excess of deferred tax liabilities because we have concluded that it is more likely than not that such deferred tax assets will ultimately not be realized.

United files a consolidated federal income tax return with UAL. Under an intercompany tax allocation policy, United computes, records and pays UAL for its own tax liability as if United were a separate company filing a separate return. In determining its own tax liabilities, United takes into account all tax credits or benefits generated and utilized as a separate company and it is compensated for the aforementioned tax benefits only if it would be able to use those benefits on a separate company basis.

Employee Benefit Plans

6 Months Ended

Jun. 30, 2013

Employee Benefit Plans

NOTE 5—EMPLOYEE BENEFIT PLANS

Defined Benefit Pension and Other Postretirement Benefit Plans. The Company’s net periodic benefit cost includes the following components (in millions):


	Pension Benefits						Other Postretirement Benefits
	Three Months Ended June 30,						Three Months Ended June 30,
	2013			2012			2013		2012
Service cost	$	32		$	25		$	14	$	13
Interest cost		47			46			28		32
Expected return on plan assets		(40	)		(35	)		—		(1	)
Amortization of unrecognized (gain) loss and prior service cost		15			6			2		(1	)
Curtailment loss		2			—			—		—
Settlement gain		(1	)		—			—		—

Total	$	55		$	42		$	44	$	43


	Pension Benefits						Other Postretirement Benefits
	Six Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
Service cost	$	65		$	50		$	28		$	26
Interest cost		94			92			56			63
Expected return on plan assets		(80	)		(70	)		(1	)		(2	)
Amortization of unrecognized (gain) loss and prior service cost		33			11			5			(2	)
Curtailment loss		2			—			—			—
Settlement gain		(1	)		—			—			—

Total	$	113		$	83		$	88		$	85

During the three and six months ended June 30, 2013, the Company contributed $38 million and $79 million, respectively, to its tax-qualified defined benefit pension plans.

Curtailments, Settlements and Plan Remeasurements. During June 2013, the Company announced it would freeze benefits for management and administrative employees under one of its defined benefit pension plans, effective December 31, 2013. As a result, the Company recognized a $2 million curtailment loss in earnings in the second quarter. The Company also recognized a settlement gain of $1 million in earnings resulting from certain lump-sum payments under a separate defined benefit pension plan. Application of curtailment and settlement accounting required the Company to remeasure the assets and liabilities of the two plans in the second quarter. The Company remeasured the pension plans’ liabilities using an average weighted discount rate of 4.74% compared to the year-end 2012 discount rate of 4.24%. As a result of the remeasurements, curtailment and settlement, the projected benefit obligation of the plans decreased by $434 million and Other comprehensive loss decreased by an actuarial gain of $442 million, of which approximately $84 million resulted from the curtailment. These items will also result in a decrease of approximately $30 million in the expected net periodic benefit cost for the remainder of 2013. The Company recognizes the earnings impacts of its pension plans in Salaries and related costs in the statements of consolidated operations.

Share-Based Compensation. In February 2013, UAL granted share-based compensation awards pursuant to the United Continental Holdings, Inc. 2008 Incentive Compensation Plan. These share-based compensation awards include approximately 0.5 million shares of restricted stock and 0.5 million restricted stock units (“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, the Company granted 1.3 million performance-based RSUs that will vest based on the Company’s return on invested capital for the three years ending December 31, 2015. If this performance condition is achieved, cash payments will be made after the end of the performance period based on the 20-day average closing price of UAL common stock immediately prior to the vesting date. The Company accounts for the RSUs as liability awards. The table below presents information related to share-based compensation (in millions):


	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Share-based compensation expense (a)	$	13	$	11	$	40	$	26



	June 30, 2013	December 31, 2012
Unrecognized share-based compensation	$45	$33

(a)

Includes $3 million and $11 million of expense recognized in merger integration-related costs for the three and six months ended June 30, 2013, respectively. Includes $3 million and $7 million of expense recognized in merger integration-related costs for the three and six months ended June 30, 2012, respectively.

Profit Sharing Plans. In 2013 and 2012, a majority of all employees participate in profit sharing plans, which pay 15% of total pre-tax earnings, excluding special items and share-based compensation expense, to eligible employees when pre-tax profit, excluding special items, profit sharing expense and share-based compensation program expense, exceeds $10 million. Eligible U.S. co-workers in each participating work group 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 workgroups. The international profit sharing plan pays eligible non-U.S. co-workers the same percentage of eligible pay that is calculated under the U.S. profit sharing plan. Profit sharing expense is recorded as a component of salaries and related costs in the consolidated statements of operations. Our profit sharing plan will change in 2014. Beginning with 2014, pilots’ share of profit sharing payments will be limited to an amount that is their pro-rata share of 10% of the Company’s profit up to a pre-tax margin of 6.9% and 20% of the Company’s profit in excess of a pre-tax margin of 6.9%. The profit sharing plan for the other workgroups is unchanged.

Financial Instruments and Fair Value Measurements

6 Months Ended

Jun. 30, 2013

Financial Instruments and Fair Value Measurements

NOTE 6—FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS

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


	June 30, 2013											December 31, 2012
	Total			Level 1		Level 2			Level 3			Total			Level 1		Level 2		Level 3
	UAL
Cash and cash equivalents	$	4,143		$	4,143	$	—		$	—		$	4,770		$	4,770	$	—	$	—
Short-term investments:
Asset-backed securities		762			—		762			—			715			—		715		—
Corporate debt		511			—		511			—			537			—		537		—
Certificates of deposit placed through an account registry service (“CDARS”)		358			—		358			—			367			—		367		—
Auction rate securities		115			—		—			115			116			—		—		116
Other short-term investments		75			—		75			—			38			—		38		—
Enhanced equipment trust certificates (“EETC”)		62			—		—			62			63			—		—		63
Fuel derivative asset (liability), net		(23	)		—		(23	)		—			46			—		46		—
Foreign currency derivatives, net		1			—		1			—			—			—		—		—
Restricted cash		435			435		—			—			447			447		—		—

	United
Cash and cash equivalents	$	4,137		$	4,137	$	—		$	—		$	4,765		$	4,765	$	—	$	—
Short-term investments:
Asset-backed securities		762			—		762			—			715			—		715		—
Corporate debt		511			—		511			—			537			—		537		—
CDARS		358			—		358			—			367			—		367		—
Auction rate securities		115			—		—			115			116			—		—		116
Other short-term investments		75			—		75			—			38			—		38		—
EETC		62			—		—			62			63			—		—		63
Fuel derivative asset (liability), net		(23	)		—		(23	)		—			46			—		46		—
Foreign currency derivatives, net		1			—		1			—			—			—		—		—
Restricted cash		435			435		—			—			447			447		—		—
Convertible debt derivative asset		395			—		—			395			268			—		—		268
Convertible debt option liability		(199	)		—		—			(199	)		(128	)		—		—		(128	)

Available-for-sale investment maturities — The short-term investments and EETC securities shown in the table above are classified as available-for-sale. Short-term investments have maturities of less than one year except for asset-backed securities, corporate debt and auction rate securities. As of June 30, 2013, asset-backed securities have remaining maturities of approximately one to 42 years, corporate debt securities have remaining maturities of approximately one to 22 years, and auction rate securities have remaining maturities of approximately one to 33 years. The EETC securities have various maturities with the final maturity in 2019.

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


	Three Months Ended June 30,
	2013				2012
UAL	Auction Rate Securities		EETC		Auction Rate Securities		EETC
Balance at March 31	$	108	$	61	$	112	$	62
Settlements		—		—		—		—
Gains (losses):
Reported in earnings—realized		—		—		—		—
Reported in earnings—unrealized		—		—		—		—
Reported in other comprehensive income (loss)		7		1		—		1

Balance at June 30	$	115	$	62	$	112	$	63


	Six Months Ended June 30,
	2013						2012
UAL	Auction Rate Securities			EETC			Auction Rate Securities			EETC
Balance at January 1	$	116		$	63		$	113		$	60
Settlements		(10	)		(2	)		—			(2	)
Gains (losses):
Reported in earnings—realized		2			—			—			—
Reported in earnings—unrealized		1			—			(1	)		—
Reported in other comprehensive income (loss)		6			1			—			5

Balance at June 30	$	115		$	62		$	112		$	63


	Three Months Ended June 30,
	2013										2012
United	Auction Rate Securities		Convertible Debt Supplemental Derivative Asset			Convertible Debt Conversion Option Liability			EETC		Auction Rate Securities		Convertible Debt Supplemental Derivative Asset		Convertible Debt Conversion Option Liability			EETC
Balance at March 31	$	108	$	413		$	(209	)	$	61	$	112	$	231	$	(119	)	$	62
Settlements		—		—			—			—		—		—		—			—
Gains (losses):
Reported in earnings:
Realized		—		—			—			—		—		—		—			—
Unrealized		—		(18	)		10			—		—		58		(28	)		—
Reported in other comprehensive income (loss)		7		—			—			1		—		—		—			1

Balance at June 30	$	115	$	395		$	(199	)	$	62	$	112	$	289	$	(147	)	$	63


	Six Months Ended June 30,
	2013											2012
United	Auction Rate Securities			Convertible Debt Supplemental Derivative Asset		Convertible Debt Conversion Option Liability			EETC			Auction Rate Securities			Convertible Debt Supplemental Derivative Asset		Convertible Debt Conversion Option Liability			EETC
Balance at January 1	$	116		$	268	$	(128	)	$	63		$	113		$	193	$	(95	)	$	60
Settlements		(10	)		—		—			(2	)		—			—		—			(2	)
Gains (losses):
Reported in earnings:
Realized		2			—		—			—			—			—		—			—
Unrealized		1			127		(71	)		—			(1	)		96		(52	)		—
Reported in other comprehensive income (loss)		6			—		—			1			—			—		—			5

Balance at June 30	$	115		$	395	$	(199	)	$	62		$	112		$	289	$	(147	)	$	63

As of June 30, 2013, the Company’s auction rate securities, which had a par value of $125 million, were variable-rate debt instruments with interest rates that reset every 7, 28 or 35 days, depending on the terms of the particular instrument. These securities are backed by pools of student loans guaranteed by state-designated guaranty agencies and reinsured by the U.S. government. All of the auction rate securities that the Company holds are senior obligations under the applicable indentures authorizing the issuance of the securities.

As of June 30, 2013, United’s EETC securities, which were repurchased in open market transactions in 2007, have unrealized gains of $3 million. All changes in the fair value of these investments have been classified within accumulated other comprehensive income.

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

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


	Fair Value of Debt by Fair Value Hierarchy Level
	June 30, 2013										December 31, 2012
	Carrying Amount		Fair Value								Carrying Amount		Fair Value
			Total		Level 1		Level 2		Level 3				Total		Level 1		Level 2		Level 3
UAL debt	$	11,123	$	12,153	$	—	$	7,589	$	4,564	$	12,252	$	13,419	$	—	$	8,045	$	5,374
United debt		10,916		11,553		—		6,989		4,564		11,850		12,460		—		7,086		5,374


Quantitative Information About Level 3 Fair Value Measurements (in millions)

Item	Fair Value at June 30, 2013			Valuation Technique	Unobservable Input	Range (Weighted Average)
Auction rate securities	$	115		Valuation Service / Broker Quotes	Broker quotes (a)	NA
EETC		62		Discounted Cash Flows	Structure credit risk (b)	5%
Convertible debt derivative asset		395		Binomial Lattice Model	Expected volatility (c) Own credit risk (d)	45% - 60% (47%) 6%
Convertible debt option liability		(199	)	Binomial Lattice Model	Expected volatility (c) Own credit risk (d)	45% - 60% (47%) 6%

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

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

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

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

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

As of June 30, 2013, the Company began using broker quotes obtained from a valuation service (in replacement of a discounted cash flows method) for valuing auction rate securities. This approach provides the best available information.

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

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

Fair value of the 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 discount rate.

- Definition

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.

+ References + Details

Hedging Activities

6 Months Ended

Jun. 30, 2013

Hedging Activities

NOTE 7—HEDGING ACTIVITIES

Aircraft Fuel Hedges. To protect against increases in the prices of aircraft fuel, the Company routinely hedges a portion of its future fuel requirements. As of June 30, 2013, the Company had hedged approximately 47% and 18% of its projected fuel requirements (942 million and 706 million gallons, respectively) for the remainder of 2013 and 2014, respectively, with commonly used financial hedge instruments based on aircraft fuel or closely related commodities, such as heating oil, diesel fuel and crude oil. As of June 30, 2013, the Company had fuel hedges expiring through December 2014. The Company does not enter into derivative instruments for non-risk management purposes.

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

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

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

The Company records each derivative instrument as a derivative asset or liability (on a gross basis) in its consolidated balance sheets, and, accordingly, records any related collateral on a gross basis.

The following tables present information about the financial statement classification of the Company’s derivatives (in millions):


Classification	Balance Sheet Location	June 30, 2013		December 31, 2012
Derivatives designated as cash flow hedges
Assets:
Fuel contracts due within one year	Receivables	$	6	$	7

Liabilities:
Fuel contracts due within one year	Current liabilities: Other	$	4	$	2
Fuel contracts with maturities greater than one year	Other liabilities and deferred credits: Other	$	3	$	—

Total liabilities		$	7	$	2

Derivatives not designated as hedges
Assets:
Fuel contracts due within one year	Receivables	$	4	$	44

Liabilities:
Fuel contracts due within one year	Current liabilities: Other	$	22	$	2
Fuel contracts with maturities greater than one year	Other liabilities and deferred credits: Other		4		1

Total liabilities		$	26	$	3

Total derivatives
Assets:
Fuel contracts due within one year	Receivables	$	10	$	51

Liabilities:
Fuel contracts due within one year	Current liabilities: Other	$	26	$	4
Fuel contracts with maturities greater than one year	Other liabilities and deferred credits: Other		7		1

Total liabilities		$	33	$	5

The following tables present the impact of derivative instruments and their location within the Company’s unaudited statements of consolidated operations (in millions):

Derivatives designated as cash flow hedges


Fuel contracts	Amount of Loss Recognized in AOCI on Derivatives (Effective Portion)						Loss Reclassified from AOCI into Fuel Expense						Amount of Loss Recognized in Nonoperating income (expense): Miscellaneous, net (Ineffective Portion)
	Three Months Ended June 30,						Three Months Ended June 30,						Three Months Ended June 30,
	2013			2012			2013			2012			2013			2012
	$	(19	)	$	(262	)	$	(9	)	$	(38	)	$	(1	)	$	(29	)

Derivatives designated as cash flow hedges


Fuel contracts	Amount of Loss Recognized in AOCI on Derivatives Effective Portion)						Loss Reclassified from AOCI into Fuel Expense						Amount of Loss Recognized in Nonoperating income (expense): Miscellaneous, net (Ineffective Portion)
	Six Months Ended June 30,						Six Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012			2013			2012
	$	(28	)	$	(169	)	$	(18	)	$	(69	)	$	(1	)	$	(4	)

Derivatives not designated as hedges


Fuel contracts
	Three Months Ended June 30,					Six Months Ended June 30,
	2013			2012		2013			2012
Amount of loss recognized in Nonoperating income (expense):
Miscellaneous, net	$	(81	)	$	—	$	(31	)	$	—

Derivative Credit Risk and Fair Value

The Company is exposed to credit losses in the event of nonperformance by counterparties to its derivative instruments. While the Company records derivative instruments on a gross basis, the Company monitors its net derivative position with each counterparty to monitor credit risk. Based on the fair value of our fuel derivative instruments, our counterparties may require us to post collateral when the price of the underlying commodity decreases, and we may require our counterparties to provide us with collateral when the price of the underlying commodity increases. The following table presents information related to the Company’s derivative credit risk as of June 30, 2013 (in millions):


Net derivative liability with counterparties	$	23
Collateral posted by the Company with counterparties (classified as an other current receivable)		—
Potential loss related to the failure of the Company’s counterparties to perform		1

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41620-113959

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

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-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579240-113959

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-URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80784-113994

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-Name Accounting Standards Codification
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-Topic 815
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-Name Accounting Standards Codification
-Topic 815
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+ Details

Commitments and Contingencies

6 Months Ended

Jun. 30, 2013

Commitments and Contingencies

NOTE 8—COMMITMENTS AND CONTINGENCIES

Commitments. On April 29, 2013, United entered into an agreement to purchase 30 Embraer EMB175 regional jets, scheduled for delivery in 2014 and 2015.

On June 17, 2013, United entered into supplemental agreements to United’s 787 aircraft purchase agreements with The Boeing Company (“Boeing”) to add to its existing firm order of Boeing 787 widebody aircraft ten Boeing 787-10 aircraft, convert an existing firm order for ten Boeing 787 aircraft into Boeing 787-10 aircraft and make certain other changes to those agreements. On June 19, 2013, United entered into amendments to its A350 purchase agreement with Airbus S.A.S. (“Airbus”) to add to its existing firm order of Airbus A350 widebody aircraft ten Airbus A350-1000 aircraft, convert its existing firm order for 25 Airbus A350-900 aircraft into Airbus A350-1000 aircraft and make certain other changes to the agreement. The Company expects to take delivery of the Boeing 787-10 aircraft and Airbus A350-1000 aircraft between 2018 and 2024.

As of June 30, 2013, UAL and United had the following commitments to purchase aircraft:

UAL Aircraft Commitments. UAL had firm commitments to purchase 100 new Boeing 737 MAX 9 aircraft scheduled for delivery from 2018 through 2025. UAL also had options to purchase additional Boeing 737 MAX 9 aircraft. UAL intends in the future to assign its interest under the purchase agreement for the 737 MAX 9 aircraft to United.

United Aircraft Commitments. United had firm commitments to purchase 199 new aircraft (59 Boeing 787 aircraft, 75 Boeing 737 aircraft, 35 Airbus A350-1000 aircraft, and 30 Embraer EMB175 aircraft) scheduled for delivery from July 1, 2013 through 2025. United also had options and purchase rights for additional aircraft. In the second quarter of 2013, United took delivery of six Boeing 737-900ER. In the remainder of 2013, United expects to take delivery of twelve Boeing 737-900ER aircraft and two Boeing 787-8 aircraft.

United had arranged for EETC financing of 14 Boeing 737-900ER aircraft, six of which were delivered during the second quarter of 2013 and two of which are scheduled to be delivered during the remainder of 2013. United also has arranged for EETC financing of one Boeing 787-8 aircraft and a bank debt financing commitment for one Boeing 737-900ER aircraft scheduled for delivery in the second half of 2013. In addition, United had secured backstop financing commitments from certain of its aircraft manufacturers for a limited number of its future aircraft deliveries, subject to certain customary conditions. However, the Company does not have backstop financing or any financing currently in place for its other firm aircraft orders. Financing will be necessary to satisfy the Company’s capital commitments for its firm order aircraft and other related capital expenditures. The Company can provide no assurance that any financing not already in place for aircraft and spare engine deliveries will be available to the Company on acceptable terms when necessary or at all. See Note 9 of this report for additional information on aircraft financing.

The Company has concluded its discussions with Boeing regarding certain contractual matters, including expected fuel burn, for current and future deliveries of certain Boeing 787 aircraft, and has reached a resolution with Boeing regarding compensation to be received in connection with those matters.

The table below summarizes the capital commitments of UAL and United (including those intended to be assigned from UAL) as of June 30, 2013, which primarily relate to the acquisition of aircraft and related spare engines, aircraft improvements and acquisition of information technology services and assets:


(In billions)
Last six months of 2013	$	1.2
2014		2.5
2015		2.0
2016		2.4
2017		1.4
After 2017		14.0

	$	23.5

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

Aircraft Operating Leases and Capacity Purchase Agreements

In May 2013, United entered into a capacity purchase agreement with SkyWest Airlines, Inc. (“SkyWest”), a wholly-owned subsidiary of SkyWest, Inc., to operate 40 Embraer EMB175 aircraft under the United Express brand. SkyWest will purchase these 76-seat aircraft with deliveries in 2014 and 2015. These 40 aircraft are in addition to United’s April 2013 agreement to purchase 30 Embraer EMB175 aircraft, which will be operated by a different United Express carrier.

The table below summarizes the Company’s future payments through the end of the terms of our capacity purchase commitments, excluding variable pass-through costs such as fuel and landing fees, among others. In addition, the table below summarizes the Company’s scheduled future minimum lease payments under aircraft operating leases having initial or remaining noncancelable lease terms of more than one year and includes aircraft rent under capacity purchase agreements, including estimated commitments from the Embraer EMB175 aircraft which will be delivered starting in 2014.


(In millions)	Capacity Purchase Agreements		Aircraft Operating Leases
Last six months of 2013	$	968	$	714
2014		1,722		1,571
2015		1,626		1,355
2016		1,400		1,122
2017		1,278		1,009
After 2017		4,388		2,590

	$	11,382	$	8,361

Facility and Other Operating Leases

In April 2013, United signed a 20-year lease extension with the Port Authority of New York and New Jersey to continue its use of Terminal C1 and C2 at Newark Liberty International Airport (“Newark”). United also committed to invest an additional $150 million in facility upgrades at Newark to enhance the customer experience and efficiency of the operation. The table below summarizes the Company’s scheduled future minimum lease payments under facility operating leases having initial or remaining noncancelable lease terms of more than one year.


(In millions)	Facility and Other Operating Leases
Last six months of 2013	$	594
2014		1,038
2015		900
2016		829
2017		782
After 2017		6,814

	$	10,957

Guarantees and Off-Balance Sheet Financing

Guarantees. 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 $1.7 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. The leasing arrangements associated with $180 million of these obligations are accounted for as capital leases. All these bonds are due between 2015 and 2038.

In the Company’s financing transactions that include loans, the Company 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 the London Interbank Offered Rate (“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 June 30, 2013, the Company had $2.0 billion of floating rate debt and $317 million of fixed rate debt, with remaining terms of up to nine 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 eight years and an aggregate balance of $2.2 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.

Credit Facilities. On March 27, 2013, United and UAL entered into a new Credit and Guaranty Agreement (the “Credit Agreement”) as the borrower and guarantor, respectively, that provides United with a $1.0 billion revolving credit facility. As of June 30, 2013, United had its entire capacity of $1.0 billion available under the revolving credit facility. See Note 9 of this report for more information.

Labor Negotiations. As of June 30, 2013, United had approximately 88,000 active employees, of whom approximately 80% were represented by various labor organizations. Having reached a ratified joint collective bargaining agreement with our pilots represented by the Air Line Pilots Association, International, we are currently in the process of negotiating joint collective bargaining agreements with our other major work groups, including our public contact co-workers, technicians, flight attendants and dispatchers.

Debt

6 Months Ended

Jun. 30, 2013

Debt

NOTE 9—DEBT

As of June 30, 2013, a substantial portion of our assets are pledged as collateral for our debt. These assets principally consist of aircraft, route authorities and loyalty program intangible assets. As of June 30, 2013, the Company was in compliance with its debt covenants.

Unsecured 6.375% Senior Notes. In May 2013, UAL issued $300 million aggregate principal amount of 6.375% Senior Notes due June 1, 2018. The notes are fully and unconditionally guaranteed and recorded by United on its balance sheet as debt.

6% Convertible Senior Notes. During the second quarter of 2013, UAL issued approximately 22 million shares of UAL common stock pursuant to agreements that UAL entered into with certain of its securityholders in exchange for approximately $189 million in aggregate principal amount of UAL’s outstanding 6% convertible senior notes due 2029 held by such securityholders. See Note 3 of this report for more information.

2013 Credit and Guaranty Agreement. On March 27, 2013, United and UAL entered into the Credit Agreement as the borrower and guarantor, respectively. The Credit Agreement consists of a $900 million term loan due April 1, 2019 and a $1.0 billion revolving credit facility available for drawing until April 1, 2018. As of June 30, 2013, United had its entire capacity of $1.0 billion available under the revolving credit facility. The obligations of United under the Credit Agreement are secured by liens on certain international route authorities between certain specified cities, certain take-off and landing rights and related assets of United.

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

The Credit Agreement includes covenants that, among other things, require the Company to maintain at least $3.0 billion of unrestricted liquidity and a minimum ratio of appraised value of collateral to the outstanding obligations under the Credit Agreement of 1.67 to 1.0, and restrict the Company’s ability to incur additional indebtedness, issue preferred stock, make investments or pay dividends. 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. Under the provisions of the Credit Agreement, UAL’s ability to pay dividends on or repurchase UAL’s common stock is restricted.

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

$500 Million Revolving Credit Facility. On March 27, 2013, the Company terminated the $500 million revolving credit facility that it had previously entered into in December 2011. There were no outstanding borrowings under the revolving credit facility.

Debt Redemptions. On February 1, 2013, United redeemed all of the $400 million aggregate principal amount of its 9.875% Senior Secured Notes due 2013 and $200 million aggregate principal amount of 12.0% Senior Second Lien Notes due 2013. On February 8, 2013, United redeemed all $123 million aggregate principal amount of the B tranche of the 2006-1 EETC equipment notes due 2013. On April 1, 2013, United redeemed all of the $180 million aggregate principal amount of the senior tranche of the 2006-1 EETC equipment notes due 2013.

EETCs. In October 2012, United created two pass-through trusts, one of which issued $712 million aggregate principal amount of Class A pass-through certificates with a stated interest rate of 4% and the second of which issued $132 million aggregate principal amount of Class B pass-through certificates with a stated interest rate of 5.5%. The proceeds of the issuance of the Class A and Class B pass-through certificates, which amounted to $844 million, are used to purchase equipment notes issued by United. Of the $844 million in proceeds raised by the pass-through trusts, United received $696 million as of June 30, 2013, of which $202 million and $403 million was received in the three and six months ended June 30, 2013, respectively. United expects to receive the remaining proceeds from the issuance through the second half of 2013 as aircraft are delivered and United issues equipment notes to the trusts. The Company records the debt obligation upon issuance of the equipment notes rather than upon the initial issuance of the pass-through certificates. The proceeds have been and are expected to fund the acquisition of new aircraft.

In December 2012, United created one pass-through trust which issued $425 million aggregate principal amount of Class C pass-through certificates with a stated interest rate of 6.125%. The proceeds of the issuance of the Class C pass-through certificates are used to purchase equipment notes issued by United related to the aircraft financed in both the March and October 2012 EETC financings. Of the $425 million in proceeds raised by the pass-through trust, United received $385 million as of June 30, 2013, of which $53 million and $107 million was received in the three and six months ended June 30, 2013, respectively. United expects to receive the remaining proceeds from the issuance through the second half of 2013 as aircraft are delivered and United issues equipment notes to the trust. The Company records the debt obligation upon issuance of the equipment notes rather than upon the initial issuance of the pass-through certificates.

The table below presents contractual principal payments at June 30, 2013 under then-outstanding long-term debt agreements in each of the next five calendar years (in millions):


	UAL		United
Last six months of 2013	$	455	$	455
2014		940		940
2015		2,037		2,037
2016		1,014		1,014
2017		577		577
After 2017		6,260		6,104

	$	11,283	$	11,127

Special Items

6 Months Ended

Jun. 30, 2013

Special Items

NOTE 10—SPECIAL ITEMS

Special Charges. For the three and six months ended June 30, special charges consisted of the following (in millions):


	Three Months Ended June 30,					Six Months Ended June 30,
	2013		2012			2013			2012
Merger integration-related costs	$	45	$	137		$	115		$	271
Additional costs associated with the temporarily grounded Boeing 787 aircraft		7		—			18			—
Voluntary severance and benefits		—		76			14			125
Gains on sale of assets and other special items, net		—		(7	)		(3	)		(26	)

Subtotal special charges		52		206			144			370
Income tax benefit		—		—			—			(2	)

Total special charges, net of income taxes	$	52	$	206		$	144		$	368

Merger integration-related costs include compensation costs related to systems integration and training, costs to repaint aircraft and other branding activities, new uniforms, costs to write-off or accelerate depreciation on systems and facilities that are no longer used or planned to be used for significantly shorter periods, relocation costs for employees and severance primarily associated with administrative headcount reductions.

During the six months ended June 30, 2013, the Company recorded $14 million associated with a voluntary program offered by United in which flight attendants took an unpaid 13-month leave of absence. The flight attendants continue to receive medical benefits and other company benefits while on leave under this program. Approximately 1,300 flight attendants opted to participate in the program. In addition, the Company recorded $18 million associated with the temporary grounding of its Boeing 787 aircraft, $7 million of which was recorded during the second quarter of 2013. The charges are comprised of aircraft depreciation expense and dedicated personnel costs that the Company incurred while the aircraft were grounded. The aircraft returned to service in May of 2013. Also, the Company recorded a $5 million gain related to a contract termination and $2 million in losses on the sale of assets.

During the three and six months ended June 30, 2012, the Company recorded $76 million and $125 million of severance and benefits associated with three voluntary employee programs, respectively. During the first quarter of 2012, approximately 400 mechanics offered to retire early in exchange for a cash severance payment that was based on the number of years of service each employee had accumulated. The Company also offered a voluntary leave of absence program that approximately 1,800 flight attendants accepted, which allows for continued medical coverage during the leave of absence period. During the second quarter of 2012, as part of the recently amended collective bargaining agreement with the Association of Flight Attendants, the Company offered a voluntary program for flight attendants at United to retire early in exchange for a cash severance payment. The payments are dependent on the number of years of service each employee has accumulated. Approximately 1,300 flight attendants accepted this program and the Company estimates the amount for this voluntary program to be approximately $76 million.

In March 2013, the Company agreed to sell up to 30 Boeing 757-200 aircraft to FedEx Corporation beginning in April 2013. As of December 31, 2012, the Company operated 133 such aircraft. Given the planned sale of up to 30 of these aircraft, the Company evaluated the entire fleet and determined that no impairment existed. However, the Company adjusted the salvage value of the aircraft designated for sale to its sales price and will record additional depreciation from the agreement date to the date of sale. This additional depreciation is not classified as special. The additional depreciation in the first six months of 2013 totaled $40 million and is estimated to be approximately $80 million for the full year 2013.

Accruals

The accrual for severance and medical costs was $38 million as of June 30, 2013, compared to $153 million as of June 30, 2012. In addition, the accrual balance of future lease payments on permanently grounded aircraft was $3 million as of June 30, 2013, compared to $8 million as of June 30, 2012.

The severance-related accrual as of June 30, 2013 is expected to be paid through 2015. Lease payments for grounded aircraft are expected to continue through 2013.

Accumulated Other Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 2013

Accumulated Other Comprehensive Income (Loss)

NOTE 11—ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The tables below present the components of the Company’s AOCI, net of tax (in millions):


UAL	Pension and Other Postretirement Unrecognized Actuarial Gains (Losses) and Prior Service Cost			Unrealized Gain (Loss) on Derivatives			Other			Total
Balance at March 31, 2013	$	(1,021	)	$	(10	)	$	4		$	(1,027	)
Other comprehensive income (loss) before reclassifications		—			(19	)		9			(10	)
Actuarial gain due to curtailment and remeasurement		442			—			—			442
Amounts reclassified from accumulated other comprehensive income		17			9			—			26

Net current-period other comprehensive income (loss)		459			(10	)		9			458

Balance at June 30, 2013	$	(562	)	$	(20	)	$	13		$	(569	)

Balance at December 31, 2012	$	(1,042	)	$	(10	)	$	6		$	(1,046	)
Other comprehensive income (loss) before reclassifications		—			(28	)		7			(21	)
Actuarial gain due to curtailment and remeasurement		442			—			—			442
Amounts reclassified from accumulated other comprehensive income		38			18			—			56

Net current-period other comprehensive income (loss)		480			(10	)		7			477

Balance at June 30, 2013	$	(562	)	$	(20	)	$	13		$	(569	)


UAL	Pension and Other Postretirement Unrecognized Actuarial Gains (Losses) and Prior Service Cost			Unrealized Gain (Loss) on Derivatives			Other			Total
Balance at March 31, 2012	$	(308	)	$	25		$	3		$	(280	)
Other comprehensive loss before reclassifications		—			(262	)		—			(262	)
Amounts reclassified from accumulated other comprehensive income		5			38			—			43

Net current-period other comprehensive income (loss)		5			(224	)		—			(219	)

Balance at June 30, 2012	$	(303	)	$	(199	)	$	3		$	(499	)



Balance at December 31, 2011	$	(312	)	$	(99	)	$	(6	)	$	(417	)
Other comprehensive income (loss) before reclassifications		—			(169	)		9			(160	)
Amounts reclassified from accumulated other comprehensive income		9			69			—			78

Net current-period other comprehensive income (loss)		9			(100	)		9			(82	)

Balance at June 30, 2012	$	(303	)	$	(199	)	$	3		$	(499	)


United	Pension and Other Postretirement Unrecognized Actuarial Gains (Losses) and Prior Service Cost			Unrealized Gain (Loss) on Derivatives			Other			Income Tax Benefit (Expense)			Total
Balance at March 31, 2013	$	(1,021	)	$	(10	)	$	4		$	—		$	(1,027	)
Other comprehensive income (loss) before reclassifications		—			(19	)		9			—			(10	)
Actuarial gain due to curtailment and remeasurement		442			—			—			—			442
Amounts reclassified from accumulated other comprehensive income		17			9			—			—			26

Net current-period other comprehensive income (loss)		459			(10	)		9			—			458

Balance at June 30, 2013	$	(562	)	$	(20	)	$	13		$	—		$	(569	)



Balance at December 31, 2012	$	(1,042	)	$	(10	)	$	5		$	(6	)	$	(1,053	)
Other comprehensive income (loss) before reclassifications		—			(28	)		8			—			(20	)
Actuarial gain due to curtailment and remeasurement		442			—			—			—			442
Amounts reclassified from accumulated other comprehensive income		38			18			—			6			62

Net current-period other comprehensive income (loss)		480			(10	)		8			6			484

Balance at June 30, 2013	$	(562	)	$	(20	)	$	13		$	—		$	(569	)


United	Pension and Other Postretirement Unrecognized Actuarial Gains (Losses) and Prior Service Cost			Unrealized Gain (Loss) on Derivatives			Other			Income Tax Expense			Total
Balance at March 31, 2012	$	(308	)	$	25		$	2		$	(6	)	$	(287	)
Other comprehensive loss before reclassifications		—			(262	)		(1	)		—			(263	)
Amounts reclassified from accumulated other comprehensive income		5			38			—			—			43

Net current-period other comprehensive income (loss)		5			(224	)		(1	)		—			(220	)

Balance at June 30, 2012	$	(303	)	$	(199	)	$	1		$	(6	)	$	(507	)


Balance at December 31, 2011	$	(312	)	$	(99	)	$	(8	)	$	(6	)	$	(425	)
Other comprehensive income (loss) before reclassifications		—			(169	)		9			—			(160	)
Amounts reclassified from accumulated other comprehensive income		9			69			—			—			78

Net current-period other comprehensive income (loss)		9			(100	)		9			—			(82	)

Balance at June 30, 2012	$	(303	)	$	(199	)	$	1		$	(6	)	$	(507	)

UAL


Details about AOCI Components	Amount Reclassified from AOCI to Income												Affected Line Item in the Statement Where Net Income is Presented
	Three Months Ended June 30,						Six Months Ended June 30,
	2013		2012				2013		2012
Derivatives designated as cash flow hedges
Fuel contracts-reclassifications of losses into earnings (a)	$	9	$	38			$	18	$	69			Aircraft fuel
Amortization of pension and post-retirement items
Amortization of unrecognized loss and prior service cost (a)		17		5	(b	)		38		9	(b	)	Salaries and related costs

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

(b)	This accumulated other comprehensive income component is included in the computation of net periodic pension costs (see Note 5 of this report for additional details.)

United


Details about AOCI Components	Amount Reclassified from AOCI to Income										Affected Line Item in the Statement Where Net Income is Presented
	Three Months Ended June 30,					Six Months Ended June 30,
	2013		2012			2013		2012
Derivatives designated as cash flow hedges
Fuel contracts-reclassifications of losses into earnings (a)	$	9	$	38		$	18	$	69		Aircraft fuel
Amortization of pension and post-retirement items
Amortization of unrecognized loss and prior service cost (a)		17		5	(b)		38		9	(b)	Salaries and related costs
Income tax expense on other comprehensive income		—		—			6		—		Income tax expense (benefit)

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

(b)	This accumulated other comprehensive income component is included in the computation of net periodic pension costs (see Note 5 of this report for additional details.)

Earnings (Loss) Per Share (Tables)

6 Months Ended

Jun. 30, 2013

Computation of Earnings Per Share


	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013		2012
Basic earnings (loss) per share:
Net income (loss)	$	469		$	339		$	52	$	(109	)
Less: Income allocable to participating securities		(1	)		(1	)		—		—

Earnings (loss) available to common stockholders	$	468		$	338		$	52	$	(109	)

Basic weighted average shares outstanding		341			331			337		331

Earnings (loss) per share, basic	$	1.37		$	1.02		$	0.15	$	(0.33	)

Diluted earnings (loss) per share:
Earnings (loss) available to common stockholders	$	468		$	338		$	52	$	(109	)
Effect of convertible notes		11			11			—		—

Earnings (loss) available to common stockholders including the effect of dilutive securities	$	479		$	349		$	52	$	(109	)

Diluted shares outstanding:
Basic weighted-average shares outstanding		341			331			337		331
Effect of convertible notes		53			61			—		—
Effect of employee stock options		—			1			—		—

Diluted weighted-average shares outstanding		394			393			337		331

Earnings (loss) per share, diluted	$	1.21		$	0.89		$	0.15	$	(0.33	)

Potentially dilutive shares excluded from diluted per share amounts:
Restricted stock and stock options		3			5			3		7
Convertible notes		—			—			57		61

Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2013

Components Of Net Periodic Benefit Cost

The Company’s net periodic benefit cost includes the following components (in millions):


	Pension Benefits						Other Postretirement Benefits
	Three Months Ended June 30,						Three Months Ended June 30,
	2013			2012			2013		2012
Service cost	$	32		$	25		$	14	$	13
Interest cost		47			46			28		32
Expected return on plan assets		(40	)		(35	)		—		(1	)
Amortization of unrecognized (gain) loss and prior service cost		15			6			2		(1	)
Curtailment loss		2			—			—		—
Settlement gain		(1	)		—			—		—

Total	$	55		$	42		$	44	$	43


	Pension Benefits						Other Postretirement Benefits
	Six Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
Service cost	$	65		$	50		$	28		$	26
Interest cost		94			92			56			63
Expected return on plan assets		(80	)		(70	)		(1	)		(2	)
Amortization of unrecognized (gain) loss and prior service cost		33			11			5			(2	)
Curtailment loss		2			—			—			—
Settlement gain		(1	)		—			—			—

Total	$	113		$	83		$	88		$	85

Share-Based Compensation Expense

The table below presents information related to share-based compensation (in millions):


	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Share-based compensation expense (a)	$	13	$	11	$	40	$	26



	June 30, 2013	December 31, 2012
Unrecognized share-based compensation	$45	$33

(a)

Financial Instruments and Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2013

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

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


	June 30, 2013											December 31, 2012
	Total			Level 1		Level 2			Level 3			Total			Level 1		Level 2		Level 3
	UAL
Cash and cash equivalents	$	4,143		$	4,143	$	—		$	—		$	4,770		$	4,770	$	—	$	—
Short-term investments:
Asset-backed securities		762			—		762			—			715			—		715		—
Corporate debt		511			—		511			—			537			—		537		—
Certificates of deposit placed through an account registry service (“CDARS”)		358			—		358			—			367			—		367		—
Auction rate securities		115			—		—			115			116			—		—		116
Other short-term investments		75			—		75			—			38			—		38		—
Enhanced equipment trust certificates (“EETC”)		62			—		—			62			63			—		—		63
Fuel derivative asset (liability), net		(23	)		—		(23	)		—			46			—		46		—
Foreign currency derivatives, net		1			—		1			—			—			—		—		—
Restricted cash		435			435		—			—			447			447		—		—

	United
Cash and cash equivalents	$	4,137		$	4,137	$	—		$	—		$	4,765		$	4,765	$	—	$	—
Short-term investments:
Asset-backed securities		762			—		762			—			715			—		715		—
Corporate debt		511			—		511			—			537			—		537		—
CDARS		358			—		358			—			367			—		367		—
Auction rate securities		115			—		—			115			116			—		—		116
Other short-term investments		75			—		75			—			38			—		38		—
EETC		62			—		—			62			63			—		—		63
Fuel derivative asset (liability), net		(23	)		—		(23	)		—			46			—		46		—
Foreign currency derivatives, net		1			—		1			—			—			—		—		—
Restricted cash		435			435		—			—			447			447		—		—
Convertible debt derivative asset		395			—		—			395			268			—		—		268
Convertible debt option liability		(199	)		—		—			(199	)		(128	)		—		—		(128	)

Activity for "Level Three" Financial Assets and Financial Liabilities

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


	Three Months Ended June 30,
	2013				2012
UAL	Auction Rate Securities		EETC		Auction Rate Securities		EETC
Balance at March 31	$	108	$	61	$	112	$	62
Settlements		—		—		—		—
Gains (losses):
Reported in earnings—realized		—		—		—		—
Reported in earnings—unrealized		—		—		—		—
Reported in other comprehensive income (loss)		7		1		—		1

Balance at June 30	$	115	$	62	$	112	$	63


	Six Months Ended June 30,
	2013						2012
UAL	Auction Rate Securities			EETC			Auction Rate Securities			EETC
Balance at January 1	$	116		$	63		$	113		$	60
Settlements		(10	)		(2	)		—			(2	)
Gains (losses):
Reported in earnings—realized		2			—			—			—
Reported in earnings—unrealized		1			—			(1	)		—
Reported in other comprehensive income (loss)		6			1			—			5

Balance at June 30	$	115		$	62		$	112		$	63


	Three Months Ended June 30,
	2013										2012
United	Auction Rate Securities		Convertible Debt Supplemental Derivative Asset			Convertible Debt Conversion Option Liability			EETC		Auction Rate Securities		Convertible Debt Supplemental Derivative Asset		Convertible Debt Conversion Option Liability			EETC
Balance at March 31	$	108	$	413		$	(209	)	$	61	$	112	$	231	$	(119	)	$	62
Settlements		—		—			—			—		—		—		—			—
Gains (losses):
Reported in earnings:
Realized		—		—			—			—		—		—		—			—
Unrealized		—		(18	)		10			—		—		58		(28	)		—
Reported in other comprehensive income (loss)		7		—			—			1		—		—		—			1

Balance at June 30	$	115	$	395		$	(199	)	$	62	$	112	$	289	$	(147	)	$	63


	Six Months Ended June 30,
	2013											2012
United	Auction Rate Securities			Convertible Debt Supplemental Derivative Asset		Convertible Debt Conversion Option Liability			EETC			Auction Rate Securities			Convertible Debt Supplemental Derivative Asset		Convertible Debt Conversion Option Liability			EETC
Balance at January 1	$	116		$	268	$	(128	)	$	63		$	113		$	193	$	(95	)	$	60
Settlements		(10	)		—		—			(2	)		—			—		—			(2	)
Gains (losses):
Reported in earnings:
Realized		2			—		—			—			—			—		—			—
Unrealized		1			127		(71	)		—			(1	)		96		(52	)		—
Reported in other comprehensive income (loss)		6			—		—			1			—			—		—			5

Balance at June 30	$	115		$	395	$	(199	)	$	62		$	112		$	289	$	(147	)	$	63

Carrying Values and Estimated Fair Values of Financial Instruments

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


	Fair Value of Debt by Fair Value Hierarchy Level
	June 30, 2013										December 31, 2012
	Carrying Amount		Fair Value								Carrying Amount		Fair Value
			Total		Level 1		Level 2		Level 3				Total		Level 1		Level 2		Level 3
UAL debt	$	11,123	$	12,153	$	—	$	7,589	$	4,564	$	12,252	$	13,419	$	—	$	8,045	$	5,374
United debt		10,916		11,553		—		6,989		4,564		11,850		12,460		—		7,086		5,374

Quantitative Information about Level 3 Fair Value Measurements


Quantitative Information About Level 3 Fair Value Measurements (in millions)

Item	Fair Value at June 30, 2013			Valuation Technique	Unobservable Input	Range (Weighted Average)
Auction rate securities	$	115		Valuation Service / Broker Quotes	Broker quotes (a)	NA
EETC		62		Discounted Cash Flows	Structure credit risk (b)	5%
Convertible debt derivative asset		395		Binomial Lattice Model	Expected volatility (c) Own credit risk (d)	45% - 60% (47%) 6%
Convertible debt option liability		(199	)	Binomial Lattice Model	Expected volatility (c) Own credit risk (d)	45% - 60% (47%) 6%

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

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

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

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

Hedging Activities (Tables)

6 Months Ended

Jun. 30, 2013

Description of Derivative Instruments

The following tables present information about the financial statement classification of the Company’s derivatives (in millions):


Classification	Balance Sheet Location	June 30, 2013		December 31, 2012
Derivatives designated as cash flow hedges
Assets:
Fuel contracts due within one year	Receivables	$	6	$	7

Liabilities:
Fuel contracts due within one year	Current liabilities: Other	$	4	$	2
Fuel contracts with maturities greater than one year	Other liabilities and deferred credits: Other	$	3	$	—

Total liabilities		$	7	$	2

Derivatives not designated as hedges
Assets:
Fuel contracts due within one year	Receivables	$	4	$	44

Liabilities:
Fuel contracts due within one year	Current liabilities: Other	$	22	$	2
Fuel contracts with maturities greater than one year	Other liabilities and deferred credits: Other		4		1

Total liabilities		$	26	$	3

Total derivatives
Assets:
Fuel contracts due within one year	Receivables	$	10	$	51

Liabilities:
Fuel contracts due within one year	Current liabilities: Other	$	26	$	4
Fuel contracts with maturities greater than one year	Other liabilities and deferred credits: Other		7		1

Total liabilities		$	33	$	5

Schedule of Gains (Losses) on Derivative Instruments

The following tables present the impact of derivative instruments and their location within the Company’s unaudited statements of consolidated operations (in millions):

Derivatives designated as cash flow hedges


Fuel contracts	Amount of Loss Recognized in AOCI on Derivatives (Effective Portion)						Loss Reclassified from AOCI into Fuel Expense						Amount of Loss Recognized in Nonoperating income (expense): Miscellaneous, net (Ineffective Portion)
	Three Months Ended June 30,						Three Months Ended June 30,						Three Months Ended June 30,
	2013			2012			2013			2012			2013			2012
	$	(19	)	$	(262	)	$	(9	)	$	(38	)	$	(1	)	$	(29	)

Derivatives designated as cash flow hedges


Fuel contracts	Amount of Loss Recognized in AOCI on Derivatives Effective Portion)						Loss Reclassified from AOCI into Fuel Expense						Amount of Loss Recognized in Nonoperating income (expense): Miscellaneous, net (Ineffective Portion)
	Six Months Ended June 30,						Six Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012			2013			2012
	$	(28	)	$	(169	)	$	(18	)	$	(69	)	$	(1	)	$	(4	)

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

Derivatives not designated as hedges


Fuel contracts
	Three Months Ended June 30,					Six Months Ended June 30,
	2013			2012		2013			2012
Amount of loss recognized in Nonoperating income (expense):
Miscellaneous, net	$	(81	)	$	—	$	(31	)	$	—

Schedule of Derivative Credit Risk and Fair Value

The following table presents information related to the Company’s derivative credit risk as of June 30, 2013 (in millions):


Net derivative liability with counterparties	$	23
Collateral posted by the Company with counterparties (classified as an other current receivable)		—
Potential loss related to the failure of the Company’s counterparties to perform		1

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2013

Schedule of Acquisition of Aircrafts and Related Spare Engines


(In billions)
Last six months of 2013	$	1.2
2014		2.5
2015		2.0
2016		2.4
2017		1.4
After 2017		14.0

	$	23.5

Summary of Scheduled Future Minimum Lease Payments Under Aircraft Operating Leases and Capacity Purchase Agreements


(In millions)	Capacity Purchase Agreements		Aircraft Operating Leases
Last six months of 2013	$	968	$	714
2014		1,722		1,571
2015		1,626		1,355
2016		1,400		1,122
2017		1,278		1,009
After 2017		4,388		2,590

	$	11,382	$	8,361

Schedule of Future Minimum Rental Payments for Operating Leases

The table below summarizes the Company’s scheduled future minimum lease payments under facility operating leases having initial or remaining noncancelable lease terms of more than one year.


(In millions)	Facility and Other Operating Leases
Last six months of 2013	$	594
2014		1,038
2015		900
2016		829
2017		782
After 2017		6,814

	$	10,957

Debt (Tables)

6 Months Ended

Jun. 30, 2013

Contractual Principal Payments

The table below presents contractual principal payments at June 30, 2013 under then-outstanding long-term debt agreements in each of the next five calendar years (in millions):


	UAL		United
Last six months of 2013	$	455	$	455
2014		940		940
2015		2,037		2,037
2016		1,014		1,014
2017		577		577
After 2017		6,260		6,104

	$	11,283	$	11,127

Special Items (Tables)

6 Months Ended

Jun. 30, 2013

Components of Special Charges

For the three and six months ended June 30, special charges consisted of the following (in millions):


	Three Months Ended June 30,					Six Months Ended June 30,
	2013		2012			2013			2012
Merger integration-related costs	$	45	$	137		$	115		$	271
Additional costs associated with the temporarily grounded Boeing 787 aircraft		7		—			18			—
Voluntary severance and benefits		—		76			14			125
Gains on sale of assets and other special items, net		—		(7	)		(3	)		(26	)

Subtotal special charges		52		206			144			370
Income tax benefit		—		—			—			(2	)

Total special charges, net of income taxes	$	52	$	206		$	144		$	368

Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2013

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

The tables below present the components of the Company’s AOCI, net of tax (in millions):


UAL	Pension and Other Postretirement Unrecognized Actuarial Gains (Losses) and Prior Service Cost			Unrealized Gain (Loss) on Derivatives			Other			Total
Balance at March 31, 2013	$	(1,021	)	$	(10	)	$	4		$	(1,027	)
Other comprehensive income (loss) before reclassifications		—			(19	)		9			(10	)
Actuarial gain due to curtailment and remeasurement		442			—			—			442
Amounts reclassified from accumulated other comprehensive income		17			9			—			26

Net current-period other comprehensive income (loss)		459			(10	)		9			458

Balance at June 30, 2013	$	(562	)	$	(20	)	$	13		$	(569	)

Balance at December 31, 2012	$	(1,042	)	$	(10	)	$	6		$	(1,046	)
Other comprehensive income (loss) before reclassifications		—			(28	)		7			(21	)
Actuarial gain due to curtailment and remeasurement		442			—			—			442
Amounts reclassified from accumulated other comprehensive income		38			18			—			56

Net current-period other comprehensive income (loss)		480			(10	)		7			477

Balance at June 30, 2013	$	(562	)	$	(20	)	$	13		$	(569	)


UAL	Pension and Other Postretirement Unrecognized Actuarial Gains (Losses) and Prior Service Cost			Unrealized Gain (Loss) on Derivatives			Other			Total
Balance at March 31, 2012	$	(308	)	$	25		$	3		$	(280	)
Other comprehensive loss before reclassifications		—			(262	)		—			(262	)
Amounts reclassified from accumulated other comprehensive income		5			38			—			43

Net current-period other comprehensive income (loss)		5			(224	)		—			(219	)

Balance at June 30, 2012	$	(303	)	$	(199	)	$	3		$	(499	)



Balance at December 31, 2011	$	(312	)	$	(99	)	$	(6	)	$	(417	)
Other comprehensive income (loss) before reclassifications		—			(169	)		9			(160	)
Amounts reclassified from accumulated other comprehensive income		9			69			—			78

Net current-period other comprehensive income (loss)		9			(100	)		9			(82	)

Balance at June 30, 2012	$	(303	)	$	(199	)	$	3		$	(499	)


United	Pension and Other Postretirement Unrecognized Actuarial Gains (Losses) and Prior Service Cost			Unrealized Gain (Loss) on Derivatives			Other			Income Tax Benefit (Expense)			Total
Balance at March 31, 2013	$	(1,021	)	$	(10	)	$	4		$	—		$	(1,027	)
Other comprehensive income (loss) before reclassifications		—			(19	)		9			—			(10	)
Actuarial gain due to curtailment and remeasurement		442			—			—			—			442
Amounts reclassified from accumulated other comprehensive income		17			9			—			—			26

Net current-period other comprehensive income (loss)		459			(10	)		9			—			458

Balance at June 30, 2013	$	(562	)	$	(20	)	$	13		$	—		$	(569	)



Balance at December 31, 2012	$	(1,042	)	$	(10	)	$	5		$	(6	)	$	(1,053	)
Other comprehensive income (loss) before reclassifications		—			(28	)		8			—			(20	)
Actuarial gain due to curtailment and remeasurement		442			—			—			—			442
Amounts reclassified from accumulated other comprehensive income		38			18			—			6			62

Net current-period other comprehensive income (loss)		480			(10	)		8			6			484

Balance at June 30, 2013	$	(562	)	$	(20	)	$	13		$	—		$	(569	)


United	Pension and Other Postretirement Unrecognized Actuarial Gains (Losses) and Prior Service Cost			Unrealized Gain (Loss) on Derivatives			Other			Income Tax Expense			Total
Balance at March 31, 2012	$	(308	)	$	25		$	2		$	(6	)	$	(287	)
Other comprehensive loss before reclassifications		—			(262	)		(1	)		—			(263	)
Amounts reclassified from accumulated other comprehensive income		5			38			—			—			43

Net current-period other comprehensive income (loss)		5			(224	)		(1	)		—			(220	)

Balance at June 30, 2012	$	(303	)	$	(199	)	$	1		$	(6	)	$	(507	)


Balance at December 31, 2011	$	(312	)	$	(99	)	$	(8	)	$	(6	)	$	(425	)
Other comprehensive income (loss) before reclassifications		—			(169	)		9			—			(160	)
Amounts reclassified from accumulated other comprehensive income		9			69			—			—			78

Net current-period other comprehensive income (loss)		9			(100	)		9			—			(82	)

Balance at June 30, 2012	$	(303	)	$	(199	)	$	1		$	(6	)	$	(507	)

UAL


Details about AOCI Components	Amount Reclassified from AOCI to Income												Affected Line Item in the Statement Where Net Income is Presented
	Three Months Ended June 30,						Six Months Ended June 30,
	2013		2012				2013		2012
Derivatives designated as cash flow hedges
Fuel contracts-reclassifications of losses into earnings (a)	$	9	$	38			$	18	$	69			Aircraft fuel
Amortization of pension and post-retirement items
Amortization of unrecognized loss and prior service cost (a)		17		5	(b	)		38		9	(b	)	Salaries and related costs

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

(b)	This accumulated other comprehensive income component is included in the computation of net periodic pension costs (see Note 5 of this report for additional details.)

United


Details about AOCI Components	Amount Reclassified from AOCI to Income										Affected Line Item in the Statement Where Net Income is Presented
	Three Months Ended June 30,					Six Months Ended June 30,
	2013		2012			2013		2012
Derivatives designated as cash flow hedges
Fuel contracts-reclassifications of losses into earnings (a)	$	9	$	38		$	18	$	69		Aircraft fuel
Amortization of pension and post-retirement items
Amortization of unrecognized loss and prior service cost (a)		17		5	(b)		38		9	(b)	Salaries and related costs
Income tax expense on other comprehensive income		—		—			6		—		Income tax expense (benefit)

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

(b)	This accumulated other comprehensive income component is included in the computation of net periodic pension costs (see Note 5 of this report for additional details.)

Computation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Basic earnings (loss) per share:
Net income (loss)	$ 469	$ 339	$ 52	$ (109)
Less: Income allocable to participating securities	(1)	(1)
Earnings (loss) available to common stockholders	$ 468	$ 338	$ 52	$ (109)
Basic weighted average shares outstanding	341	331	337	331
Earnings (loss) per share, basic	$ 1.37	$ 1.02	$ 0.15	$ (0.33)
Diluted earnings (loss) per share:
Earnings (loss) available to common stockholders	$ 468	$ 338	$ 52	$ (109)
Effect of convertible notes on diluted earnings per share, amount	11	11
Earnings (loss) available to common stockholders including the effect of dilutive securities	$ 479	$ 349	$ 52	$ (109)
Diluted shares outstanding:
Basic weighted-average shares outstanding	341	331	337	331
Effect of convertible notes on diluted earnings per share, shares	53	61
Effect of employee stock options		1
Diluted weighted-average shares outstanding	394	393	337	331
Earnings (loss) per share, diluted	$ 1.21	$ 0.89	$ 0.15	$ (0.33)
Restricted Stock And Stock Options
Potentially dilutive shares excluded from diluted per share amounts:
Potentially dilutive shares excluded from diluted per share amounts	3	5	3	7
Convertible Notes
Potentially dilutive shares excluded from diluted per share amounts:
Potentially dilutive shares excluded from diluted per share amounts			57	61

Earnings (loss) Per Share - Additional Information (Detail) shares in Millions, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2013 USD ($) shares	Jun. 30, 2013 USD ($) shares
Computation Of Earnings Per Share Line Items
Common stock issued in exchange for convertible notes \| shares	22	22
Aggregate principal amount of senior convertible notes exchanged		$ 189
6% Convertible Senior Notes
Computation Of Earnings Per Share Line Items
Aggregate principal amount of senior convertible notes exchanged	$ 189	$ 189
Debt instrument effective interest rate	6.00%	6.00%
Due date of debt instrument	2029	2029

Income Taxes - Additional Information (Detail)	6 Months Ended
Income Taxes - Additional Information (Detail)	Jun. 30, 2013
Income Taxes [Line Items]
Federal statutory income tax rate	35.00%

Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 32	$ 25	$ 65	$ 50
Interest cost	47	46	94	92
Expected return on plan assets	(40)	(35)	(80)	(70)
Amortization of unrecognized (gain) loss and prior service cost	15	6	33	11
Curtailment loss	2		2
Settlement gain	(1)		(1)
Total	55	42	113	83
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	14	13	28	26
Interest cost	28	32	56	63
Expected return on plan assets		(1)	(1)	(2)
Amortization of unrecognized (gain) loss and prior service cost	2	(1)	5	(2)
Total	$ 44	$ 43	$ 88	$ 85

Employee Benefit Plans - Additional Information (Detail) shares in Millions, $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Feb. 28, 2013 shares	Jun. 30, 2013 USD ($)	Jun. 30, 2013 USD ($) d	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer contribution to tax-qualified defined benefit pension plans		$ 38	$ 79
Defined benefit plan, discount rate		4.74%	4.74%	4.24%
Reduction of projected benefit obligation of the plans			$ (434)
Curtailment, settlements and corresponding remeasurements adjustment in other comprehensive income		$ (442)	(442)
Plan remeasurements decrease against the expected net periodic benefit cost		30	30
Defined benefit plan curtailment effect		84	$ 84
Number of days used to compute performance period average closing price of restricted stock units \| d			20
Percentage of pre-tax earnings paid for profit sharing plan			15.00%
Share-based compensation program pre-tax profits excluding special items, profit sharing expense and share-based compensation program expense threshold			$ 10
Pro Rata Share
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax margin			6.90%
Pro Rata Share \| Up to 6.9%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of pre-tax earnings paid for profit sharing plan			10.00%
Pro Rata Share \| In excess of 6.9%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of pre-tax earnings paid for profit sharing plan			20.00%
Pension Benefits
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Defined benefit plan, curtailment loss		(2)	$ (2)
Defined benefit plan, settlement gain		$ 1	$ 1
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, award granted \| shares	0.5
Share-Based Compensation, vesting period	3 years
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, award granted \| shares	0.5
Share-Based Compensation, vesting period	3 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation, award granted \| shares	1.3
Share-Based Compensation, vesting period	3 years
Share-Based Compensation, vesting date	Dec. 31, 2015

Share-Based Compensation Expense (Detail) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

Jun. 30, 2013

Jun. 30, 2012

Jun. 30, 2013

Jun. 30, 2012

Dec. 31, 2012

Share-based compensation expense

^[1]

$ 13

$ 11

$ 40

$ 26

Unrecognized share-based compensation

$ 45

$ 33

[1]

Share-Based Compensation Expense (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Expense recognized in integration-related costs	$ 3	$ 3	$ 11	$ 7

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Jun. 30, 2013	Dec. 31, 2012
Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and cash equivalents	$ 4,143	$ 4,770
Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	762	715
Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	511	537
CDARS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	358	367
Auction Rate Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	115	116
Other Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	75	38
EETC
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
EETC	62	63
Fuel Derivatives, Net
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fuel derivative asset (liability), net	(23)	46
Foreign Currency Derivatives, Net
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Foreign currency derivatives, net	1
Restricted Cash
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Restricted cash	435	447
Level 1 \| Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and cash equivalents	4,143	4,770
Level 1 \| Restricted Cash
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Restricted cash	435	447
Level 2 \| Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	762	715
Level 2 \| Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	511	537
Level 2 \| CDARS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	358	367
Level 2 \| Other Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	75	38
Level 2 \| Fuel Derivatives, Net
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fuel derivative asset (liability), net	(23)	46
Level 2 \| Foreign Currency Derivatives, Net
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Foreign currency derivatives, net	1
Level 3 \| Auction Rate Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	115	116
Level 3 \| EETC
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
EETC	62	63
United Airlines, Inc. \| Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and cash equivalents	4,137	4,765
United Airlines, Inc. \| Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	762	715
United Airlines, Inc. \| Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	511	537
United Airlines, Inc. \| CDARS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	358	367
United Airlines, Inc. \| Auction Rate Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	115	116
United Airlines, Inc. \| Other Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	75	38
United Airlines, Inc. \| EETC
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
EETC	62	63
United Airlines, Inc. \| Fuel Derivatives, Net
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fuel derivative asset (liability), net	(23)	46
United Airlines, Inc. \| Foreign Currency Derivatives, Net
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Foreign currency derivatives, net	1
United Airlines, Inc. \| Restricted Cash
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Restricted cash	435	447
United Airlines, Inc. \| Convertible Debt Derivative Asset
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Convertible debt derivative asset	395	268
United Airlines, Inc. \| Convertible Debt Option Liability
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Convertible debt option liability	(199)	(128)
United Airlines, Inc. \| Level 1 \| Cash and Cash Equivalents
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and cash equivalents	4,137	4,765
United Airlines, Inc. \| Level 1 \| Restricted Cash
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Restricted cash	435	447
United Airlines, Inc. \| Level 2 \| Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	762	715
United Airlines, Inc. \| Level 2 \| Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	511	537
United Airlines, Inc. \| Level 2 \| CDARS
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	358	367
United Airlines, Inc. \| Level 2 \| Other Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	75	38
United Airlines, Inc. \| Level 2 \| Fuel Derivatives, Net
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fuel derivative asset (liability), net	(23)	46
United Airlines, Inc. \| Level 2 \| Foreign Currency Derivatives, Net
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Foreign currency derivatives, net	1
United Airlines, Inc. \| Level 3 \| Auction Rate Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	115	116
United Airlines, Inc. \| Level 3 \| EETC
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
EETC	62	63
United Airlines, Inc. \| Level 3 \| Convertible Debt Derivative Asset
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Convertible debt derivative asset	395	268
United Airlines, Inc. \| Level 3 \| Convertible Debt Option Liability
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Convertible debt option liability	$ (199)	$ (128)

Financial Instruments and Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Fair Value [Line Items]
Debt instrument convertible stated interest rate	8.00%	8.00%
6% convertible junior subordinated debentures due 2030
Fair Value [Line Items]
Debt instrument convertible stated interest rate	6.00%
Debt instrument maturity year	2030
Four Point Five Percent Convertible Notes Due Two Thousand Fifteen
Fair Value [Line Items]
Debt instrument convertible stated interest rate	4.50%
Debt instrument maturity year	2015
Auction Rate Securities
Fair Value [Line Items]
Aggregate principal amount issued	$ 125
Available for sale investment, interest rates reset interval	28 days
Auction Rate Securities \| Minimum
Fair Value [Line Items]
Available for sale investment, interest rates reset interval	7 days
Auction Rate Securities \| Maximum
Fair Value [Line Items]
Available for sale investment, interest rates reset interval	35 days
EETC
Fair Value [Line Items]
Investment securities, unrealized gains (losses)	$ 3
United Airlines, Inc.
Fair Value [Line Items]
Debt instrument convertible stated interest rate	8.00%	8.00%
United Airlines, Inc. \| Auction Rate Securities \| Minimum
Fair Value [Line Items]
Available for sale investment, maturity year	1 year
United Airlines, Inc. \| Auction Rate Securities \| Maximum
Fair Value [Line Items]
Available for sale investment, maturity year	33 years
United Airlines, Inc. \| EETC
Fair Value [Line Items]
Available for sale investment, maturity date	2019
United Airlines, Inc. \| Asset-backed Securities \| Minimum
Fair Value [Line Items]
Available for sale investment, maturity year	1 year
United Airlines, Inc. \| Asset-backed Securities \| Maximum
Fair Value [Line Items]
Available for sale investment, maturity year	42 years
United Airlines, Inc. \| Corporate Debt \| Minimum
Fair Value [Line Items]
Available for sale investment, maturity year	1 year
United Airlines, Inc. \| Corporate Debt \| Maximum
Fair Value [Line Items]
Available for sale investment, maturity year	22 years

Activity for "Level Three" Financial Assets and Financial Liabilities (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Auction Rate Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 108	$ 112	$ 116	$ 113
Settlements			(10)
Realized			2
Reported in earnings-unrealized			1	(1)
Reported in other comprehensive income (loss)	7		6
Ending Balance	115	112	115	112
Auction Rate Securities \| United Airlines, Inc.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	108	112	116	113
Settlements			(10)
Realized			2
Reported in earnings-unrealized			1	(1)
Reported in other comprehensive income (loss)	7		6
Ending Balance	115	112	115	112
EETC
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	61	62	63	60
Settlements			(2)	(2)
Reported in other comprehensive income (loss)	1	1	1	5
Ending Balance	62	63	62	63
EETC \| United Airlines, Inc.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	61	62	63	60
Settlements			(2)	(2)
Reported in other comprehensive income (loss)	1	1	1	5
Ending Balance	62	63	62	63
Convertible Debt Derivative Asset \| United Airlines, Inc.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	413	231	268	193
Reported in earnings-unrealized	(18)	58	127	96
Ending Balance	395	289	395	289
Convertible Debt Option Liability \| United Airlines, Inc.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	(209)	(119)	(128)	(95)
Reported in earnings-unrealized	10	(28)	(71)	(52)
Ending Balance	$ (199)	$ (147)	$ (199)	$ (147)

Carrying Values and Estimated Fair Values of Financial Instruments (Detail) - USD ($) $ in Millions	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 11,283
United Airlines, Inc.
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	11,127
Carrying (Reported) Amount, Fair Value Disclosure
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	11,123	$ 12,252
Carrying (Reported) Amount, Fair Value Disclosure \| United Airlines, Inc.
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	10,916	11,850
Estimate of Fair Value, Fair Value Disclosure
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	12,153	13,419
Estimate of Fair Value, Fair Value Disclosure \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	7,589	8,045
Estimate of Fair Value, Fair Value Disclosure \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	4,564	5,374
Estimate of Fair Value, Fair Value Disclosure \| United Airlines, Inc.
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	11,553	12,460
Estimate of Fair Value, Fair Value Disclosure \| United Airlines, Inc. \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	6,989	7,086
Estimate of Fair Value, Fair Value Disclosure \| United Airlines, Inc. \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 4,564	$ 5,374

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

6 Months Ended

Jun. 30, 2013

USD ($)

Auction Rate Securities

Fair Value Measurements [Line Items]

Level 3 Financial Instruments, asset

$ 115

Valuation Technique

Valuation Service / Broker Quotes

Unobservable Input

Broker quotes

^[1]

EETC

Fair Value Measurements [Line Items]

Level 3 Financial Instruments, asset

$ 62

Valuation Technique

Discounted Cash Flows

Unobservable Input

Structure credit risk

^[2]

EETC | Structure Credit Risk | Minimum

Fair Value Measurements [Line Items]

Level 3 fair value measurements, percentage

5.00%

Convertible Debt Derivative Asset

Fair Value Measurements [Line Items]

Level 3 Financial Instruments, asset

$ 395

Valuation Technique

Binomial Lattice Model

Unobservable Input

Expected volatility Own credit risk

^[3],[4]

Convertible Debt Derivative Asset | Expected Volatility

Fair Value Measurements [Line Items]

Level 3 fair value measurements, weighted average percentage

47.00%

Convertible Debt Derivative Asset | Expected Volatility | Minimum

Fair Value Measurements [Line Items]

Level 3 fair value measurements, percentage

45.00%

Convertible Debt Derivative Asset | Expected Volatility | Maximum

Fair Value Measurements [Line Items]

Level 3 fair value measurements, percentage

60.00%

Convertible Debt Derivative Asset | Own Credit Risk | Minimum

Fair Value Measurements [Line Items]

Level 3 fair value measurements, percentage

6.00%

Convertible Debt Option Liability

Fair Value Measurements [Line Items]

Level 3 Financial Instruments, liability

$ (199)

Valuation Technique

Binomial Lattice Model

Unobservable Input

Expected volatility Own credit risk

^[3],[4]

Convertible Debt Option Liability | Expected Volatility

Fair Value Measurements [Line Items]

Level 3 fair value measurements, weighted average percentage

47.00%

Convertible Debt Option Liability | Expected Volatility | Minimum

Fair Value Measurements [Line Items]

Level 3 fair value measurements, percentage

45.00%

Convertible Debt Option Liability | Expected Volatility | Maximum

Fair Value Measurements [Line Items]

Level 3 fair value measurements, percentage

60.00%

Convertible Debt Option Liability | Own Credit Risk | Minimum

Fair Value Measurements [Line Items]

Level 3 fair value measurements, percentage

6.00%

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

Hedging Activities - Additional Information (Detail) gal in Millions	6 Months Ended
	Jun. 30, 2013 gal
Derivatives And Hedging Activities [Line Items]
Fuel hedges expiration date	2014-12
2013 Projected
Derivatives And Hedging Activities [Line Items]
Percentage of projected fuel requirements	47.00%
Volume of fuel hedging	942
2014 Projected
Derivatives And Hedging Activities [Line Items]
Percentage of projected fuel requirements	18.00%
Volume of fuel hedging	706

Description of Derivative Instruments (Detail) - USD ($) $ in Millions	Jun. 30, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities	$ 33	$ 5
Receivables
Derivatives, Fair Value [Line Items]
Fuel contracts, assets	10	51
Other Liabilities Current
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities	26	4
Other Liabilities Noncurrent
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities	7	1
Designated as Hedging Instrument \| Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities	7	2
Designated as Hedging Instrument \| Cash Flow Hedging \| Receivables
Derivatives, Fair Value [Line Items]
Fuel contracts, assets	6	7
Designated as Hedging Instrument \| Cash Flow Hedging \| Other Liabilities Current
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities	4	2
Designated as Hedging Instrument \| Cash Flow Hedging \| Other Liabilities Noncurrent
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities	3
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities	26	3
Not Designated as Hedging Instrument \| Receivables
Derivatives, Fair Value [Line Items]
Fuel contracts, assets	4	44
Not Designated as Hedging Instrument \| Other Liabilities Current
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities	22	2
Not Designated as Hedging Instrument \| Other Liabilities Noncurrent
Derivatives, Fair Value [Line Items]
Fuel contracts, liabilities	$ 4	$ 1

Schedule of Gains (Losses) on Derivative Instruments (Detail) - Designated as Hedging Instrument - Cash Flow Hedging - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ (19)	$ (262)	$ (28)	$ (169)
Gain (Loss) Reclassified from AOCI into Income (Fuel Expense) (Effective Portion)	(9)	(38)	(18)	(69)
Amount of Gain (Loss) Recognized in Income (Nonoperating Expense) (Ineffective Portion)	$ (1)	$ (29)	$ (1)	$ (4)

Schedule of Derivative Instruments not Designated as Hedges Gains (Losses) (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income (Nonoperating Expense)	$ (81)	$ (31)

Schedule of Derivative Credit Risk and Fair Value (Detail) $ in Millions	Jun. 30, 2013 USD ($)
Derivative [Line Items]
Net derivative liability with counterparties	$ 23
Collateral posted by the Company with counterparties (classified as an other current receivable)
Potential loss related to the failure of the Company's counterparties to perform	$ 1

Commitments and Contingencies - Additional Information (Detail) $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2013 USD ($) Aircraft	Jun. 30, 2013 USD ($) Employee Aircraft yr	Jun. 19, 2013 Aircraft	Jun. 17, 2013 Aircraft	May 31, 2013 Aircraft	Mar. 27, 2013 USD ($)
Commitments and Contingencies [Line Items]
Lease extension signed with the Port Authority of New York and New Jersey	20 years
Commitment to invest an additional amount in facility upgrades at Newark \| $	$ 150
Percentage of employees represented by various U.S. labor organizations		80.00%
United Airlines, Inc.
Commitments and Contingencies [Line Items]
Number of employees \| Employee		88,000
Floating Rate Debt
Commitments and Contingencies [Line Items]
Debt instrument principal amount \| $		$ 2,000
Notes payable, fixed interest rates of 4.00% to 12.00% (weighted average rate of 6.96% as of December 31, 2012), payable through 2024
Commitments and Contingencies [Line Items]
Debt instrument principal amount \| $		317
Loans And Leases From Non U S Entities
Commitments and Contingencies [Line Items]
Debt instrument principal amount \| $		2,200
Boeing 787-10
Commitments and Contingencies [Line Items]
Number of new aircraft under purchase rights and options				10
Airbus A350-1000 aircraft
Commitments and Contingencies [Line Items]
Number of new aircraft under purchase rights and options			25
Embraer EMB175 aircraft
Commitments and Contingencies [Line Items]
Number of new aircraft committed to purchase	30				40
Tax-exempt special facilities revenue bonds
Commitments and Contingencies [Line Items]
Guarantor obligations, maximum exposure \| $		1,900
Operating leases obligations \| $		1,700
Capital leases obligations \| $		$ 180
Revolving Credit Facility
Commitments and Contingencies [Line Items]
Borrowing capacity under revolving credit facility \| $						$ 1,000
Capacity available under the revolving credit facility \| $						$ 1,000
Capital Addition Purchase Commitments \| United Airlines, Inc.
Commitments and Contingencies [Line Items]
Number of new aircraft committed to purchase		199
Capital Addition Purchase Commitments \| Boeing 737
Commitments and Contingencies [Line Items]
Number of new aircraft committed to purchase		100
Number of aircraft under financing arrangement expected to be delivered		1
Capital Addition Purchase Commitments \| Boeing 737 \| United Airlines, Inc.
Commitments and Contingencies [Line Items]
Number of new aircraft committed to purchase		75
Capital Addition Purchase Commitments \| Boeing 787-10 \| United Airlines, Inc.
Commitments and Contingencies [Line Items]
Number of new aircraft committed to purchase		59
Number of aircraft expected to be delivered		2
Capital Addition Purchase Commitments \| Airbus A350-1000 aircraft \| United Airlines, Inc.
Commitments and Contingencies [Line Items]
Number of new aircraft committed to purchase		35
Capital Addition Purchase Commitments \| Embraer EMB175 aircraft \| United Airlines, Inc.
Commitments and Contingencies [Line Items]
Number of new aircraft committed to purchase		30
Capital Addition Purchase Commitments \| Boeing 737-900ER AirCraft
Commitments and Contingencies [Line Items]
Number of aircraft under financing arrangement expected to be delivered		14
Number of aircraft under financing arrangement delivered		6
Number of aircraft under financing arrangement expected to be delivered during the reminder of 2013		2
Capital Addition Purchase Commitments \| Boeing 737-900ER AirCraft \| United Airlines, Inc.
Commitments and Contingencies [Line Items]
Number of aircraft delivered		6
Number of aircraft expected to be delivered		12
Capital Addition Purchase Commitments \| Boeing 787-8
Commitments and Contingencies [Line Items]
Number of aircraft under financing arrangement expected to be delivered		1
Minimum \| Airbus A350-1000 aircraft
Commitments and Contingencies [Line Items]
New aircraft, scheduled delivery date			2018
Minimum \| Embraer EMB175 aircraft
Commitments and Contingencies [Line Items]
New aircraft, scheduled delivery date	2014
Minimum \| Tax-exempt special facilities revenue bonds
Commitments and Contingencies [Line Items]
Debt instrument, maturity year		2015
Minimum \| Capital Addition Purchase Commitments \| United Airlines, Inc.
Commitments and Contingencies [Line Items]
New aircraft, scheduled delivery date		Jul. 01, 2013
Minimum \| Capital Addition Purchase Commitments \| Boeing 737
Commitments and Contingencies [Line Items]
New aircraft, scheduled delivery date		2018
Maximum
Commitments and Contingencies [Line Items]
Debt instrument, remaining terms (years) \| yr		9
Maximum \| Loans And Leases From Non U S Entities
Commitments and Contingencies [Line Items]
Debt instrument, remaining terms (years) \| yr		8
Maximum \| Airbus A350-1000 aircraft
Commitments and Contingencies [Line Items]
New aircraft, scheduled delivery date			2024
Maximum \| Embraer EMB175 aircraft
Commitments and Contingencies [Line Items]
New aircraft, scheduled delivery date	2015
Maximum \| Tax-exempt special facilities revenue bonds
Commitments and Contingencies [Line Items]
Debt instrument, maturity year		2038
Maximum \| Capital Addition Purchase Commitments \| United Airlines, Inc.
Commitments and Contingencies [Line Items]
New aircraft, scheduled delivery date		2025
Maximum \| Capital Addition Purchase Commitments \| Boeing 737
Commitments and Contingencies [Line Items]
New aircraft, scheduled delivery date		2025

Schedule of Acquisition of Aircrafts and Related Spare Engines (Detail) $ in Billions	Jun. 30, 2013 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Last six months of 2013	$ 1.2
2014	2.5
2015	2.0
2016	2.4
2017	1.4
After 2017	14.0
Total commitments	$ 23.5

Summary of Scheduled Future Minimum Lease Payments Under Aircraft Operating Leases (Detail) $ in Millions	Jun. 30, 2013 USD ($)
Capacity Purchase Agreements
Commitments and Contingencies Disclosure [Line Items]
Last six months of 2013	$ 968
2014	1,722
2015	1,626
2016	1,400
2017	1,278
After 2017	4,388
Contractual Obligation, Total	11,382
Aircraft Operating Leases
Commitments and Contingencies Disclosure [Line Items]
Last six months of 2013	714
2014	1,571
2015	1,355
2016	1,122
2017	1,009
After 2017	2,590
Operating leases obligations	$ 8,361

Summary of Scheduled Future Minimum Lease Payments Under Facility Operating Leases (Detail) - Facility And Other Operating Leases $ in Millions	Jun. 30, 2013 USD ($)
Operating Leased Assets [Line Items]
Last six months of 2013	$ 594
2014	1,038
2015	900
2016	829
2017	782
After 2017	6,814
Operating leases obligations	$ 10,957

Debt - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	1 Months Ended		3 Months Ended	6 Months Ended
	May 31, 2013	Mar. 27, 2013	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012	Apr. 02, 2013	Feb. 08, 2013	Feb. 01, 2013	Dec. 31, 2012	Oct. 31, 2012
Debt Instrument [Line Items]
Debt instrument stated interest rate			8.00%	8.00%	8.00%
Common stock issued in exchange for convertible notes			22	22
Aggregate principal amount of senior convertible notes exchanged				$ 189
Quarterly principal repayment amount				0.25%
Commencement date of installment payment				Jun. 30, 2013
Debt instrument, maturity date				Apr. 01, 2019
Commitment fee percentage				0.75%
Unrestricted liquidity requirement				$ 3,000
Minimum ratio of appraised value of collateral to the outstanding obligations			1.67	1.67
Proceeds from issuance of long-term debt				$ 520	$ 86
9.875% Senior Notes Due 2013
Debt Instrument [Line Items]
Aggregate principal amount								$ 400
Debt instrument stated interest rate								9.875%
Debt instrument maturity year								2013
12% Second Lien Due 2013
Debt Instrument [Line Items]
Aggregate principal amount								$ 200
Debt instrument stated interest rate								12.00%
Debt instrument maturity year								2013
Class B Pass Through Certificates
Debt Instrument [Line Items]
Aggregate principal amount							$ 123
Debt instrument maturity year							2013
Senior tranche
Debt Instrument [Line Items]
Aggregate principal amount						$ 180
Debt instrument maturity year						2013
Class C Pass Through Certificates
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt			$ 53	107
Class A Pass Through Certificates and Class B Pass Through Certificates
Debt Instrument [Line Items]
Aggregate principal amount										$ 844
Proceeds from issuance of long-term debt			$ 202	$ 403
6% Convertible Senior Notes
Debt Instrument [Line Items]
Debt instrument effective interest rate			6.00%	6.00%
Aggregate principal amount of senior convertible notes exchanged			$ 189	$ 189
Debt instrument maturity year			2029	2029
United Airlines, Inc.
Debt Instrument [Line Items]
Debt instrument stated interest rate			8.00%	8.00%	8.00%
Proceeds from issuance of long-term debt				$ 520	$ 86
United Airlines, Inc. \| Class B Pass Through Certificates
Debt Instrument [Line Items]
Aggregate principal amount										$ 132
Debt instrument stated interest rate										5.50%
United Airlines, Inc. \| Class C Pass Through Certificates
Debt Instrument [Line Items]
Aggregate principal amount									$ 425
Debt instrument stated interest rate									6.125%
Proceeds from issuance of long-term debt				385
United Airlines, Inc. \| Class A Pass Through Certificates
Debt Instrument [Line Items]
Aggregate principal amount										$ 712
Debt instrument stated interest rate										4.00%
United Airlines, Inc. \| Class A Pass Through Certificates and Class B Pass Through Certificates
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt				$ 696
Unsecured Debt \| Senior Notes 6 Point 375 Percent Due 2018
Debt Instrument [Line Items]
Aggregate principal amount	$ 300
Debt instrument maturity date	Jun. 01, 2018
Debt instrument stated interest rate	6.375%
LIBOR
Debt Instrument [Line Items]
Debt instrument, floor rate				1.00%
Debt instrument, basis spread on variable rate				3.00%
Certain Market Interest Rates
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate				2.00%
Term Loan Facility
Debt Instrument [Line Items]
Debt instrument maturity date		Apr. 01, 2019
Credit Agreement		$ 900
Amount utilized to repay term loan		$ 900
Revolving Credit Facility
Debt Instrument [Line Items]
Debt instrument maturity date		Apr. 01, 2018
Credit Agreement		$ 1,000
Available under revolving credit facility		1,000
Line of credit maximum borrowing capacity		500
Amended Credit Facility
Debt Instrument [Line Items]
Aggregate principal amount		$ 1,200
Debt instrument maturity year		2014
Cash utilized to repay term loan		$ 300

Contractual Principal Payments Under then-Outstanding Long Term Debt (Detail) $ in Millions	Jun. 30, 2013 USD ($)
Debt Instrument [Line Items]
Last six months of 2013	$ 455
2014	940
2015	2,037
2016	1,014
2017	577
After 2017	6,260
Long-term debt	11,283
United Airlines, Inc.
Debt Instrument [Line Items]
Last six months of 2013	455
2014	940
2015	2,037
2016	1,014
2017	577
After 2017	6,104
Long-term debt	$ 11,127

Components of Special Charges (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Special Charges [Line Items]
Merger integration-related costs	$ 45	$ 137	$ 115	$ 271
Additional costs associated with the temporarily grounded Boeing 787 aircraft	7		18
Voluntary severance and benefits		76	14	125
Gains on sale of assets and other special items, net		(7)	(3)	(26)
Subtotal special charges	52	206	144	370
Income tax benefit				(2)
Total special charges, net of income taxes	$ 52	$ 206	$ 144	$ 368

Special Items - Additional Information (Detail) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2013 USD ($)	Mar. 31, 2013 USD ($) Aircraft	Jun. 30, 2012 USD ($)	Jun. 30, 2013 USD ($)	Jun. 30, 2012 USD ($) Attendant
Special Charges [Line Items]
Severance and benefits			$ 76	$ 14	$ 125
Number of flight attendants voluntarily on leave				1,300	1,800
Temporary grounding of 787 aircraft charges	$ 7			$ 18
Gain related to contract termination				5
Loss on sale of asset				2
Number of mechanics offering to retire early					400
Number of flight attendants accepted voluntary retirement \| Attendant					1,300
Number of aircraft that the company operate \| Aircraft		133
Number of aircraft to be sold \| Aircraft		30
Depreciation		$ 40
Expected depreciation for full year of 2013		$ 80
Accrual severance and medical costs	38		153	38	$ 153
Accrual balance of future lease	$ 3		$ 8	$ 3	8
Voluntary retirement program
Special Charges [Line Items]
Severance and benefits					$ 76

Components of Accumulated Other Comprehensive Income (loss), Net of Tax (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (1,027)	$ (280)	$ (1,046)	$ (417)
Other comprehensive income (loss) before reclassifications	(10)	(262)	(21)	(160)
Actuarial gain due to curtailment and remeasurement	442		442
Amounts reclassified from accumulated other comprehensive income	26	43	56	78
Net current-period other comprehensive income (loss)	458	(219)	477	(82)
Ending Balance	(569)	(499)	(569)	(499)
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,021)	(308)	(1,042)	(312)
Actuarial gain due to curtailment and remeasurement	442		442
Amounts reclassified from accumulated other comprehensive income	17	5	38	9
Net current-period other comprehensive income (loss)	459	5	480	9
Ending Balance	(562)	(303)	(562)	(303)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(10)	25	(10)	(99)
Other comprehensive income (loss) before reclassifications	(19)	(262)	(28)	(169)
Amounts reclassified from accumulated other comprehensive income	9	38	18	69
Net current-period other comprehensive income (loss)	(10)	(224)	(10)	(100)
Ending Balance	(20)	(199)	(20)	(199)
Other Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	4	3	6	(6)
Other comprehensive income (loss) before reclassifications	9		7	9
Net current-period other comprehensive income (loss)	9		7	9
Ending Balance	13	3	13	3
United Airlines, Inc.
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,027)	(287)	(1,053)	(425)
Other comprehensive income (loss) before reclassifications	(10)	(263)	(20)	(160)
Actuarial gain due to curtailment and remeasurement	442		442
Amounts reclassified from accumulated other comprehensive income	26	43	62	78
Net current-period other comprehensive income (loss)	458	(220)	484	(82)
Ending Balance	(569)	(507)	(569)	(507)
United Airlines, Inc. \| Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,021)	(308)	(1,042)	(312)
Actuarial gain due to curtailment and remeasurement	442		442
Amounts reclassified from accumulated other comprehensive income	17	5	38	9
Net current-period other comprehensive income (loss)	459	5	480	9
Ending Balance	(562)	(303)	(562)	(303)
United Airlines, Inc. \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(10)	25	(10)	(99)
Other comprehensive income (loss) before reclassifications	(19)	(262)	(28)	(169)
Amounts reclassified from accumulated other comprehensive income	9	38	18	69
Net current-period other comprehensive income (loss)	(10)	(224)	(10)	(100)
Ending Balance	(20)	(199)	(20)	(199)
United Airlines, Inc. \| Other Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	4	2	5	(8)
Other comprehensive income (loss) before reclassifications	9	(1)	8	9
Net current-period other comprehensive income (loss)	9	(1)	8	9
Ending Balance	$ 13	1	13	1
United Airlines, Inc. \| Income Tax Benefit Expense
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(6)	(6)	(6)
Amounts reclassified from accumulated other comprehensive income			6
Net current-period other comprehensive income (loss)			$ 6
Ending Balance		$ (6)		$ (6)

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

3 Months Ended

6 Months Ended

Jun. 30, 2013

Jun. 30, 2012

Jun. 30, 2013

Jun. 30, 2012

Salaries And Related Costs

Accumulated Other Comprehensive Income (Loss) [Line Items]

Amortization of unrecognized loss and prior service cost

^[1]

$ 17

$ 5

^[2]

$ 38

$ 9

^[2]

Fuel Oil Contract | Cash Flow Hedging | Aircraft Fuel

Accumulated Other Comprehensive Income (Loss) [Line Items]

Fuel contracts-reclassifications of losses into earnings

^[1]

United Airlines, Inc. | Salaries And Related Costs

Accumulated Other Comprehensive Income (Loss) [Line Items]

Amortization of unrecognized loss and prior service cost

^[1]

^[2]

United Airlines, Inc. | Income Tax Benefit Expense

Accumulated Other Comprehensive Income (Loss) [Line Items]

Income tax expense on other comprehensive income

United Airlines, Inc. | Fuel Oil Contract | Cash Flow Hedging | Aircraft Fuel

Accumulated Other Comprehensive Income (Loss) [Line Items]

Fuel contracts-reclassifications of losses into earnings

^[1]

$ 9

$ 38

$ 18

$ 69

[1]	Income tax expense offset by Company's valuation allowance.
[2]	This accumulated other comprehensive income component is included in the computation of net periodic pension costs (see Note 5 of this report for additional details.)