American Airlines 10-K 21 Feb 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2017	Feb. 16, 2018	Jun. 30, 2017
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Trading Symbol	AAL
Entity Registrant Name	American Airlines Group Inc.
Entity Central Index Key	6,201
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		473,138,683
Entity Public Float			$ 24
American Airlines, Inc. [Member]
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Entity Registrant Name	AMERICAN AIRLINES INC
Entity Central Index Key	4,515
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		1,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating revenues:
Mainline passenger	$ 29,238	$ 27,909	$ 29,037
Regional passenger	6,895	6,670	6,475
Cargo	800	700	760
Other	5,274	4,901	4,718
Total operating revenues	42,207	40,180	40,990
Operating expenses:
Aircraft fuel and related taxes	6,128	5,071	6,226
Salaries, wages and benefits	11,816	10,890	9,524
Regional expenses	6,546	6,044	5,983
Maintenance, materials and repairs	1,959	1,834	1,889
Other rent and landing fees	1,806	1,772	1,731
Aircraft rent	1,197	1,203	1,250
Selling expenses	1,477	1,323	1,394
Depreciation and amortization	1,702	1,525	1,364
Special items, net	712	709	1,051
Other	4,806	4,525	4,374
Total operating expenses	38,149	34,896	34,786
Operating income	4,058	5,284	6,204
Nonoperating income (expense):
Interest income	94	63	39
Interest expense, net	(1,053)	(991)	(880)
Other, net	(15)	(57)	(747)
Total nonoperating expense, net	(974)	(985)	(1,588)
Income before income taxes	3,084	4,299	4,616
Income tax provision (benefit)	1,165	1,623	(2,994)
Net income	$ 1,919	$ 2,676	$ 7,610
Earnings per common share:
Basic (in dollars per share)	$ 3.92	$ 4.85	$ 11.39
Diluted (in dollars per share)	$ 3.90	$ 4.81	$ 11.07
Weighted average shares outstanding (in thousands):
Basic (in shares)	489,164	552,308	668,393
Diluted (in shares)	491,692	556,099	687,355
Cash dividends declared per common share	$ 0.40	$ 0.40	$ 0.40
American Airlines, Inc. [Member]
Operating revenues:
Mainline passenger	$ 29,238	$ 27,909	$ 29,037
Regional passenger	6,895	6,670	6,475
Cargo	800	700	760
Other	5,262	4,884	4,666
Total operating revenues	42,195	40,163	40,938
Operating expenses:
Aircraft fuel and related taxes	6,128	5,071	6,226
Salaries, wages and benefits	11,804	10,881	9,514
Regional expenses	6,572	6,009	5,952
Maintenance, materials and repairs	1,959	1,834	1,889
Other rent and landing fees	1,806	1,772	1,731
Aircraft rent	1,197	1,203	1,250
Selling expenses	1,477	1,323	1,394
Depreciation and amortization	1,702	1,525	1,364
Special items, net	712	709	1,051
Other	4,806	4,532	4,378
Total operating expenses	38,163	34,859	34,749
Operating income	4,032	5,304	6,189
Nonoperating income (expense):
Interest income	215	104	49
Interest expense, net	(988)	(906)	(796)
Other, net	(15)	(59)	(774)
Total nonoperating expense, net	(788)	(861)	(1,521)
Income before income taxes	3,244	4,443	4,668
Income tax provision (benefit)	1,322	1,662	(3,452)
Net income	$ 1,922	$ 2,781	$ 8,120

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net income	$ 1,919	$ 2,676	$ 7,610
Pension, retiree medical and other postretirement benefits:
Amortization of actuarial loss and prior service cost	(55)	(65)	(108)
Current year change	(15)	(293)	(51)
Investments and derivative financial instruments	(1)	7	(14)
Total other comprehensive loss, net of tax	(71)	(351)	(173)
Total comprehensive income	1,848	2,325	7,437
American Airlines, Inc. [Member]
Net income	1,922	2,781	8,120
Pension, retiree medical and other postretirement benefits:
Amortization of actuarial loss and prior service cost	(55)	(65)	(109)
Current year change	(13)	(292)	(51)
Investments and derivative financial instruments	(1)	6	(15)
Total other comprehensive loss, net of tax	(69)	(351)	(175)
Total comprehensive income	$ 1,853	$ 2,430	$ 7,945

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash	$ 295	$ 322
Short-term investments	4,771	6,037
Restricted cash and short-term investments	318	638
Accounts receivable, net	1,752	1,594
Aircraft fuel, spare parts and supplies, net	1,359	1,094
Prepaid expenses and other	651	639
Total current assets	9,146	10,324
Operating property and equipment
Flight equipment	40,318	37,028
Ground property and equipment	8,267	7,116
Equipment purchase deposits	1,217	1,209
Total property and equipment, at cost	49,802	45,353
Less accumulated depreciation and amortization	(15,646)	(14,194)
Total property and equipment, net	34,156	31,159
Other assets
Goodwill	4,091	4,091
Intangibles, net of accumulated amortization of $622 and $578, respectively	2,203	2,173
Deferred tax asset	427	1,498
Other assets	1,373	2,029
Total other assets	8,094	9,791
Total assets	51,396	51,274
Current liabilities
Current maturities of long-term debt and capital leases	2,554	1,855
Accounts payable	1,688	1,592
Accrued salaries and wages	1,672	1,516
Air traffic liability	3,978	3,912
Loyalty program liability	2,791	2,789
Other accrued liabilities	2,281	2,208
Total current liabilities	14,964	13,872
Noncurrent liabilities
Long-term debt and capital leases, net of current maturities	22,511	22,489
Pension and postretirement benefits	7,497	7,842
Other liabilities	2,498	3,286
Total noncurrent liabilities	32,506	33,617
Commitments and contingencies
Stockholders’ equity
Common stock	5	5
Additional paid-in capital	5,714	7,223
Accumulated other comprehensive loss	(5,154)	(5,083)
Retained earnings	3,361	1,640
Total stockholders’ equity	3,926	3,785
Total liabilities and stockholders’ equity	51,396	51,274
American Airlines, Inc. [Member]
Current assets
Cash	287	310
Short-term investments	4,768	6,034
Restricted cash and short-term investments	318	638
Accounts receivable, net	1,755	1,599
Receivables from related parties, net	8,822	6,810
Aircraft fuel, spare parts and supplies, net	1,294	1,032
Prepaid expenses and other	647	633
Total current assets	17,891	17,056
Operating property and equipment
Flight equipment	39,993	36,671
Ground property and equipment	8,006	6,910
Equipment purchase deposits	1,217	1,209
Total property and equipment, at cost	49,216	44,790
Less accumulated depreciation and amortization	(15,354)	(13,909)
Total property and equipment, net	33,862	30,881
Other assets
Goodwill	4,091	4,091
Intangibles, net of accumulated amortization of $622 and $578, respectively	2,203	2,173
Deferred tax asset	682	1,912
Other assets	1,283	1,979
Total other assets	8,259	10,155
Total assets	60,012	58,092
Current liabilities
Current maturities of long-term debt and capital leases	2,058	1,859
Accounts payable	1,625	1,546
Accrued salaries and wages	1,613	1,460
Air traffic liability	3,978	3,912
Loyalty program liability	2,791	2,789
Other accrued liabilities	2,209	2,106
Total current liabilities	14,274	13,672
Noncurrent liabilities
Long-term debt and capital leases, net of current maturities	21,236	20,718
Pension and postretirement benefits	7,452	7,800
Other liabilities	2,456	3,253
Total noncurrent liabilities	31,144	31,771
Commitments and contingencies
Stockholders’ equity
Common stock	0	0
Additional paid-in capital	16,716	16,624
Accumulated other comprehensive loss	(5,251)	(5,182)
Retained earnings	3,129	1,207
Total stockholders’ equity	14,594	12,649
Total liabilities and stockholders’ equity	$ 60,012	$ 58,092

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Accumulated amortization of intangibles	$ 622	$ 578
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	1,750,000,000	1,750,000,000
Common stock, shares issued	475,507,887	507,294,153
Common stock, shares outstanding	475,507,887	507,294,153
American Airlines, Inc. [Member]
Accumulated amortization of intangibles	$ 622	$ 578
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized	1,000	1,000
Common stock, shares issued	1,000	1,000
Common stock, shares outstanding	1,000	1,000

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income	$ 1,919	$ 2,676	$ 7,610
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	2,017	1,818	1,609
Deferred income tax provision (benefit)	1,141	1,611	(3,014)
Debt discount and lease amortization	(114)	(119)	(122)
Special items, non-cash	272	270	273
Pension and postretirement	(132)	(68)	(193)
Share-based compensation	90	100	284
Other, net	(39)	(18)	(12)
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable	(190)	(160)	352
Increase in other assets	(433)	(184)	(27)
Increase in accounts payable and accrued liabilities	299	307	173
Increase (decrease) in air traffic liability	66	164	(505)
Increase (decrease) in loyalty program liability	2	264	(295)
Contributions to pension plans	(286)	(32)	(6)
Increase (decrease) in other liabilities	132	(105)	122
Net cash provided by operating activities	4,744	6,524	6,249
Cash flows from investing activities:
Capital expenditures and aircraft purchase deposits	(5,971)	(5,731)	(6,151)
Proceeds from sale of property and equipment and sale-leaseback transactions	947	125	35
Purchases of short-term investments	(4,633)	(6,241)	(8,126)
Sales of short-term investments	5,915	6,092	8,517
Decrease in restricted cash and short-term investments	319	57	79
Purchase of equity investment	(203)	0	0
Proceeds from sale of an investment	0	0	52
Net cash used in investing activities	(3,626)	(5,698)	(5,594)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	3,058	7,701	5,009
Payments on long-term debt and capital leases	(2,332)	(3,827)	(2,153)
Deferred financing costs	(85)	(77)	(87)
Treasury stock repurchases	(1,615)	(4,500)	(3,846)
Dividend payments	(198)	(224)	(278)
Other financing activities	27	33	96
Net cash used in financing activities	(1,145)	(894)	(1,259)
Net decrease in cash	(27)	(68)	(604)
Cash at beginning of year	322	390	994
Cash at end of year	295	322	390
American Airlines, Inc. [Member]
Cash flows from operating activities:
Net income	1,922	2,781	8,120
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	1,964	1,762	1,560
Deferred income tax provision (benefit)	1,298	1,652	(3,467)
Debt discount and lease amortization	(119)	(124)	(126)
Special items, non-cash	272	270	295
Pension and postretirement	(132)	(70)	(194)
Share-based compensation	90	100	284
Other, net	(25)	(16)	(21)
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable	(189)	(169)	354
Increase in other assets	(405)	(205)	(22)
Increase in accounts payable and accrued liabilities	266	336	214
Increase (decrease) in air traffic liability	66	164	(505)
Increase in receivables from related parties, net	(1,994)	(4,862)	(3,695)
Increase (decrease) in loyalty program liability	2	264	(295)
Contributions to pension plans	(286)	(32)	(6)
Increase (decrease) in other liabilities	140	(101)	91
Net cash provided by operating activities	2,870	1,750	2,587
Cash flows from investing activities:
Capital expenditures and aircraft purchase deposits	(5,881)	(5,657)	(6,075)
Proceeds from sale of property and equipment and sale-leaseback transactions	922	115	26
Purchases of short-term investments	(4,633)	(6,241)	(8,126)
Sales of short-term investments	5,915	6,092	8,517
Decrease in restricted cash and short-term investments	319	57	79
Purchase of equity investment	(203)	0	0
Net cash used in investing activities	(3,561)	(5,634)	(5,579)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	3,058	7,701	4,509
Payments on long-term debt and capital leases	(2,332)	(3,827)	(2,153)
Deferred financing costs	(85)	(77)	(80)
Other financing activities	27	33	96
Net cash used in financing activities	668	3,830	2,372
Net decrease in cash	(23)	(54)	(620)
Cash at beginning of year	310	364	984
Cash at end of year	$ 287	$ 310	$ 364

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	American Airlines, Inc. [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]American Airlines, Inc. [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]American Airlines, Inc. [Member]	Retained Earnings (Deficit) [Member]	Retained Earnings (Deficit) [Member]American Airlines, Inc. [Member]
Beginning Balance at Dec. 31, 2014	$ 2,021	$ 1,406	$ 7	$ 15,135	$ 16,174	$ (4,559)	$ (4,656)	$ (8,562)	$ (10,112)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	7,610	8,120						7,610	8,120
Changes in pension, retiree medical and other postretirement benefits liability	(159)	(160)				(159)	(160)
Net changes in fair value of derivative financial instruments	(9)	(9)				(9)	(9)
Cash tax withholding on shares issued	(306)			(306)
Purchase and retirement of common stock	(3,586)		(1)	(3,585)
Dividends declared on common stock	(278)							(278)
Settlement of single-dip unsecured claims held in distributed claims reserve	63			63
Share-based compensation expense	284	284		284	284
Intercompany equity transfer		63			63
Change in unrealized loss on investments	(5)	(6)				(5)	(6)
Ending Balance at Dec. 31, 2015	5,635	9,698	6	11,591	16,521	(4,732)	(4,831)	(1,230)	(1,992)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,676	2,781						2,676	2,781
Changes in pension, retiree medical and other postretirement benefits liability	(564)	(563)				(564)	(563)
Non-cash tax benefit	203	203				203	203
Cash tax withholding on shares issued	(56)			(56)
Purchase and retirement of common stock	(4,416)		(1)	(4,415)
Dividends declared on common stock	(224)							(224)
Settlement of single-dip unsecured claims held in distributed claims reserve	3			3
Share-based compensation expense	100	100		100	100
Intercompany equity transfer		3			3
Impact of adoption of Accounting Standards Update (ASU) 2016-09 related to share-based compensation (See Note 14)	418	418						418	418
Change in unrealized loss on investments	10	9				10	9
Ending Balance at Dec. 31, 2016	3,785	12,649	5	7,223	16,624	(5,083)	(5,182)	1,640	1,207
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,919	1,922						1,919	1,922
Changes in pension, retiree medical and other postretirement benefits liability	(117)	(114)				(117)	(114)
Non-cash tax benefit	47	46				47	46
Cash tax withholding on shares issued	(51)			(51)
Purchase and retirement of common stock	(1,563)			(1,563)
Dividends declared on common stock	(198)							(198)
Settlement of single-dip unsecured claims held in distributed claims reserve	15			15
Share-based compensation expense	90	90		90	90
Intercompany equity transfer		2			2
Change in unrealized loss on investments	(1)	(1)				(1)	(1)
Ending Balance at Dec. 31, 2017	$ 3,926	$ 14,594	$ 5	$ 5,714	$ 16,716	$ (5,154)	$ (5,251)	$ 3,361	$ 3,129

Consolidated Statements of Sto8

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Purchase and retirement of common stock, shares	33,953,127
Purchase and retirement of common stock, shares	33,900,000	119,823,621	85,141,691
Dividends declared on common stock per share (in dollars per share)	$ 0.40	$ 0.40	$ 0.40
Issuance of shares of common stock pursuant to employee stock plans	2,166,861	2,506,067	12,289,537

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies (a) Basis of Presentation American Airlines Group Inc. (we, us, our and similar terms, or AAG), a Delaware corporation, is a holding company whose primary business activity is the operation of a major network air carrier, providing scheduled air transportation for passengers and cargo through its mainline operating subsidiary, American Airlines, Inc. (American) and its wholly-owned regional airline subsidiaries, Envoy Aviation Group Inc. (Envoy), Piedmont Airlines, Inc. (Piedmont) and PSA Airlines, Inc. (PSA) that operate under the brand American Eagle. On December 9, 2013, a subsidiary of AMR Corporation (AMR) merged with and into US Airways Group, Inc. (US Airways Group), a Delaware corporation, which survived as a wholly-owned subsidiary of AAG, and AAG emerged from Chapter 11 (the Merger). Upon closing of the Merger and emergence from Chapter 11, AMR changed its name to American Airlines Group Inc. On December 30, 2015, in order to simplify AAG’s internal corporate structure, US Airways Group merged with and into AAG, with AAG as the surviving corporation. Immediately thereafter, US Airways, Inc. (US Airways), a wholly-owned subsidiary of US Airways Group, merged with and into American, with American as the surviving corporation. All significant intercompany transactions have been eliminated. The preparation of financial statements in accordance with accounting principles generally accepted in the United States (GAAP) requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The most significant areas of judgment relate to passenger revenue recognition, impairment of goodwill, impairment of long-lived and intangible assets, the loyalty program, valuation allowance for deferred tax assets, as well as pension and retiree medical and other postretirement benefits. (b) Short-term Investments Short-term investments are classified as available-for-sale and stated at fair value. Realized gains and losses are recorded in nonoperating expense on the consolidated statement of operations. Unrealized gains and losses are recorded in accumulated other comprehensive loss on the consolidated balance sheets. (c) Restricted Cash and Short-term Investments We have restricted cash and short-term investments related primarily to collateral held to support workers’ compensation obligations. (d) Aircraft Fuel, Spare Parts and Supplies, Net Aircraft fuel is recorded on a first-in, first-out basis. Spare parts and supplies are recorded at average costs less an allowance for obsolescence. These items are expensed when used. (e) Operating Property and Equipment Operating property and equipment is recorded at cost and depreciated or amortized to residual values over the asset’s estimated useful life or the lease term, whichever is less, using the straight-line method. Residual values for aircraft, engines and related rotable parts are generally 5% to 10% of original cost. Costs of major improvements that enhance the usefulness of the asset are capitalized and depreciated or amortized over the estimated useful life of the asset or the lease term, whichever is less. The estimated useful lives for the principal property and equipment classifications are as follows: Principal Property and Equipment Classification Estimated Useful Life Aircraft, engines and related rotable parts 20 – 30 years Buildings and improvements 5 – 30 years Furniture, fixtures and other equipment 3 – 10 years Capitalized software 5 – 10 years We assess impairment on operating property and equipment when events and circumstances indicate that the assets may be impaired. An asset or group of assets is considered impaired when the undiscounted cash flows estimated to be generated by the assets are less than the carrying amount of the assets and the net book value of the assets exceeds their estimated fair value. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount or fair value less the cost to sell. Total depreciation and amortization expense was $2.2 billion , $1.9 billion and $1.7 billion for the years ended December 31, 2017 , 2016 and 2015 , respectively. (f) Income Taxes Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are recorded net as noncurrent deferred income taxes. We provide a valuation allowance for our deferred tax assets when it is more likely than not that some portion, or all of our deferred tax assets, will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income. We consider all available positive and negative evidence and make certain assumptions in evaluating the realizability of our deferred tax assets. Many factors are considered that impact our assessment of future profitability, including conditions which are beyond our control, such as the health of the economy, the level and volatility of fuel prices and travel demand. (g) Goodwill Goodwill represents the excess of the purchase price over the fair value of the net assets acquired and liabilities assumed. Goodwill is not amortized but assessed for impairment annually on October 1 st or more frequently if events or circumstances indicate that goodwill may be impaired. We have one consolidated reporting unit. Goodwill is assessed for impairment by initially performing a qualitative assessment and, if necessary, then comparing the fair value of the reporting unit to its carrying value, including goodwill. If the fair value of the reporting unit is less than the carrying value, a second step is performed to determine the implied fair value of goodwill. If the implied fair value of goodwill is lower than its carrying value, an impairment charge equal to the difference is recorded. Based upon our annual assessment, there was no goodwill impairment in 2017 . The carrying value of the goodwill on our consolidated balance sheets was $4.1 billion as of December 31, 2017 and 2016 . (h) Other Intangibles, Net Intangible assets consist primarily of domestic airport slots, customer relationships, marketing agreements, international slots and route authorities, airport gate leasehold rights and tradenames. Finite-Lived Intangible Assets Finite-lived intangible assets are amortized over their respective estimated useful lives and reviewed for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable. The following table provides information relating to our amortizable intangible assets as of December 31, 2017 and 2016 (in millions): December 31, 2017 2016 Domestic airport slots $ 365 $ 365 Customer relationships 300 300 Marketing agreements 105 105 Tradenames 35 35 Airport gate leasehold rights 137 137 Accumulated amortization (622 ) (578 ) Total $ 320 $ 364 Certain domestic airport slots and airport gate leasehold rights are amortized on a straight-line basis over 25 years. The customer relationships and marketing agreements were identified as intangible assets subject to amortization and are amortized on a straight-line basis over approximately nine years and 30 years, respectively. Tradenames are fully amortized. We recorded amortization expense related to these intangible assets of $44 million , $76 million and $55 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. We expect to record annual amortization expense for these intangible assets as follows (in millions): 2018 $ 41 2019 41 2020 41 2021 41 2022 41 2023 and thereafter 115 Total $ 320 Indefinite-Lived Intangible Assets Indefinite-lived intangible assets include certain domestic airport slots at our hubs and international slots and route authorities. Indefinite-lived intangible assets are not amortized but instead are assessed for impairment annually on October 1 st or more frequently if events or circumstances indicate that the asset may be impaired. As of December 31, 2017 and 2016 , we had $1.9 billion and $1.8 billion , respectively, of indefinite-lived intangible assets on our consolidated balance sheets. Indefinite-lived intangible assets are assessed for impairment by initially performing a qualitative assessment to determine whether we believe it is more likely than not that an asset has been impaired. If we believe impairment has occurred, we then evaluate for impairment by comparing the estimated fair value of assets to the carrying value. An impairment charge is recognized if the asset’s estimated fair value is less than its carrying value. Based upon our annual assessment, there was no indefinite-lived intangible asset impairment in 2017 . (i) Loyalty Program We currently operate the loyalty program, AAdvantage. This program awards mileage credits to passengers who fly on American, any one world airline or other partner airlines, or by using the services of other program participants, such as the Citi and Barclaycard US co-branded credit cards, hotels and car rental companies. Mileage credits can be redeemed for travel on American or other participating partner airlines. Through December 31, 2017, we used the incremental cost method to account for the portion of our loyalty program liability incurred when AAdvantage members earn mileage credits by flying on American, any one world airline or other partner airlines. We have an obligation to provide future travel when these mileage credits are redeemed and therefore have recorded a liability for mileage credits outstanding. The incremental cost liability includes all mileage credits, even mileage credits for members whose account balances have not yet reached the minimum level required to redeem an award. Mileage credits are subject to expiration. The liability for outstanding mileage credits is valued based on the estimated incremental cost of carrying one additional passenger. The estimated incremental cost primarily includes unit costs incurred for fuel, food and insurance as well as fees incurred when travel awards are redeemed on partner airlines. In calculating the liability, we estimate how many mileage credits will never be redeemed for travel and exclude those mileage credits from the estimate of the liability. Estimates are also made for the number of miles that will be used per award redemption and the number of travel awards that will be redeemed on partner airlines. These costs and estimates are based on our historical program experience as well as consideration of enacted program changes, as applicable. Changes in the liability resulting from members earning additional mileage credits or changes in estimates are recorded in the consolidated statements of operations as a part of passenger revenue. As of December 31, 2017 and 2016 , the liability for outstanding mileage credits accounted for under the incremental cost method was $677 million and $669 million , respectively, and is included on the consolidated balance sheets within loyalty program liability. We also sell loyalty program mileage credits to participating airline partners and non-airline business partners, such as the Citi and Barclaycard US co-branded credit cards. Sales of mileage credits to non-airline business partners is comprised of two components, transportation and marketing. We account for mileage sales under our agreements with non-airline business partners in accordance with ASU 2009-13, “Revenue Recognition (Topic 605) – Multiple-Deliverable Revenue Arrangements.” In accordance with ASU 2009-13, we allocate the consideration received from the sale of mileage credits based on the relative selling price of each product or service delivered. As a result of our co-branded credit card program agreements with Citi and Barclaycard US that we entered into in 2016, we identified the following revenue elements in these co-branded credit card agreements: the transportation component; and the use of the American brand including access to loyalty program member lists, advertising and other travel related benefits (collectively, the marketing component). The transportation component represents the estimated selling price of future travel awards and is determined using historical transaction information, including information related to customer redemption patterns. The transportation component is deferred based on its relative selling price and is amortized into passenger revenue on a straight-line basis over the period in which the mileage credits are expected to be redeemed for travel. As of December 31, 2017 and 2016 , we had $2.1 billion in deferred revenue from the sale of mileage credits recorded within loyalty program liability on our consolidated balance sheets. The services under the marketing component are provided periodically, but no less than monthly. Accordingly, the marketing component is considered earned and recognized in other revenues in the period of the mileage sale. For the years ended December 31, 2017 , 2016 and 2015 , the marketing component of mileage sales and other marketing related payments included in other revenues was approximately $2.2 billion , $1.9 billion and $1.7 billion , respectively. Effective January 1, 2018, we are adopting ASU 2014-09: Revenue from Contracts with Customers (Topic 606). See Recent Accounting Pronouncements in Note 1(r) below for further discussion. (j) Revenue Passenger Revenue Passenger revenue is recognized when transportation is provided. Ticket sales for transportation that has not yet been provided are initially deferred and recorded as air traffic liability on the consolidated balance sheets. The air traffic liability represents tickets sold for future travel dates and estimated future refunds and exchanges of tickets sold for past travel dates. The balance in the air traffic liability fluctuates throughout the year based on seasonal travel patterns. Our air traffic liability was $4.0 billion and $3.9 billion as of December 31, 2017 and 2016 , respectively. The majority of tickets sold are nonrefundable. A small percentage of tickets, some of which are partially used tickets, expire unused. Due to complex pricing structures, refund and exchange policies, and interline agreements with other airlines, certain amounts are recognized in passenger revenue using estimates regarding both the timing of the revenue recognition and the amount of revenue to be recognized. These estimates are generally based on the analysis of our historical data. We and other airline industry participants have consistently applied this accounting method to estimate revenue from forfeited tickets at the date of travel. Estimated future refunds and exchanges included in the air traffic liability are routinely evaluated based on subsequent activity to validate the accuracy of our estimates. Any adjustments resulting from periodic evaluations of the estimated air traffic liability are included in passenger revenue during the period in which the evaluations are completed. Regional carriers provide scheduled air transportation under the brand name American Eagle. We classify revenues generated from transportation on these carriers as regional passenger revenues. Liabilities related to tickets sold by us for travel on these air carriers is also included in our air traffic liability and are subsequently recognized as revenue in the same manner as described above. Passenger Taxes and Fees Various taxes and fees assessed on the sale of tickets to end customers are collected by us as an agent and remitted to taxing authorities. These taxes and fees have been presented on a net basis in the accompanying consolidated statements of operations and recorded as a liability until remitted to the appropriate taxing authority. Cargo Revenue Cargo revenue is recognized when we provide the transportation. Other Revenue Other revenue includes revenue associated with marketing services provided to our business partners as part of our loyalty program, baggage fees, ticketing change fees, airport clubs and inflight services. The accounting and recognition for the loyalty program marketing services are discussed in Note 1(i) above. Baggage fees, ticketing change fees, airport clubs and inflight service revenues are recognized when we provide the service. Effective January 1, 2018, we are adopting ASU 2014-09: Revenue from Contracts with Customers (Topic 606). See Recent Accounting Pronouncements in Note 1(r) below for further discussion. (k) Maintenance, Materials and Repairs Maintenance and repair costs for owned and leased flight equipment are charged to operating expense as incurred, except costs incurred for maintenance and repair under flight hour maintenance contract agreements, which are accrued based on contractual terms when an obligation exists. (l) Selling Expenses Selling expenses include credit card fees, commissions, computerized reservations systems fees and advertising. Advertising costs are expensed as incurred. Advertising expense was $135 million , $116 million and $110 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. (m) Share-based Compensation We account for our share-based compensation expense based on the fair value of the stock award at the time of grant, which is recognized ratably over the vesting period of the stock award. Certain awards have performance conditions that must be achieved prior to vesting and are expensed based on the expected achievement at each reporting period. The fair value of stock appreciation rights is estimated using a Black-Scholes option pricing model. The fair value of restricted stock units is based on the market price of the underlying shares of common stock on the date of grant. See Note 14 for further discussion of share-based compensation. (n) Deferred Gains and Credits, Net Included within deferred gains and credits, net are amounts deferred and amortized into future periods associated with the adjustment of leases to fair value in connection with the application of acquisition accounting, deferred gains on the sale-leaseback of aircraft and certain vendor incentives. We periodically receive vendor incentives in connection with acquisition of aircraft and engines. These credits are deferred until aircraft and engines are delivered and then applied as a reduction to the cost of the related equipment. (o) Foreign Currency Gains and Losses Foreign currency gains and losses are recorded as part of other nonoperating expense, net in our consolidated statements of operations. Foreign currency losses for 2017 were $4 million . Foreign currency gains were $1 million for 2016 . For 2015 , foreign currency losses were $751 million and included a $592 million nonoperating special charge to write off all of the value of Venezuelan bolivars held by us due to continued lack of repatriations and deterioration of economic conditions in Venezuela. (p) Other Operating Expenses Other operating expenses includes costs associated with ground and cargo handling, crew travel, aircraft food and catering, passenger accommodation, airport security, international navigation fees and certain general and administrative expenses. (q) Regional Expenses Expenses associated with American Eagle operations are classified as regional expenses on the consolidated statements of operations. Regional expenses consist of the following (in millions): Year Ended December 31, 2017 2016 2015 Aircraft fuel and related taxes $ 1,382 $ 1,109 $ 1,230 Salaries, wages and benefits 1,452 1,333 1,187 Capacity purchases from third-party regional carriers (1) 1,581 1,538 1,651 Maintenance, materials and repairs 281 345 323 Other rent and landing fees 625 564 504 Aircraft rent 35 36 34 Selling expenses 361 347 333 Depreciation and amortization 315 301 252 Special items, net 22 14 29 Other 492 457 440 Total regional expenses $ 6,546 $ 6,044 $ 5,983 (1) For the years ended December 31, 2017 , 2016 and 2015 , the component of capacity purchase expenses representing the lease of aircraft for accounting purposes was approximately $437 million , $405 million and $492 million , respectively. (r) Recent Accounting Pronouncements Standards Effective for 2018 Reporting Periods Effective January 1, 2018, we are adopting the accounting pronouncements described below. The adoption and related required disclosures will be reported in our first quarter 2018 Quarterly Report on Form 10-Q. ASU 2014-09: Revenue from Contracts with Customers (Topic 606) (the New Revenue Standard) The New Revenue Standard applies to all companies that enter into contracts with customers to transfer goods or services. We are adopting the New Revenue Standard using the full retrospective method, which results in the recast of each prior reporting period presented. The adoption of the New Revenue Standard will impact our accounting for outstanding mileage credits earned through travel by AAdvantage loyalty program members. There is no change in accounting for sales of mileage credits to co-branded card or other partners as those are currently reported in accordance with the New Revenue Standard. Through December 31, 2017, we used the incremental cost method to account for the portion of our loyalty program liability related to mileage credits earned through travel, which were valued based on the estimated incremental cost of carrying one additional passenger (see (i) Loyalty Program above). The New Revenue Standard requires us to change our policy to the deferred revenue method and apply a relative selling price approach whereby a portion of each passenger ticket sale attributable to mileage credits earned is deferred and recognized in passenger revenue upon future mileage redemption. The value of the earned mileage credits is materially greater under the deferred revenue method than the value attributed to these mileage credits under the incremental cost method. The New Revenue Standard will also require certain reclassifications, principally the reclassification of certain ancillary revenues previously classified and reported as other revenue to passenger revenue and as applicable to cargo revenue. Additionally, the New Revenue Standard requires a gross presentation on the face of our statement of operations for certain revenues and expenses that had previously been presented on a net basis. See recast 2017 statement of operations and balance sheet data presented below for the expected effects of adoption. ASU 2017-07: Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (the New Retirement Standard) The New Retirement Standard requires all components of our net periodic benefit cost (income), with the exception of service cost, previously reported within operating expenses as salaries, wages and benefits, to be reclassified and reported within nonoperating income (expense). The New Retirement Standard is required to be applied retrospectively, which results in the recast of each prior reporting period presented. The adoption of the New Retirement Standard has no impact on pre-tax income or net income reported. See recast 2017 statement of operations data presented below for the expected effects of adoption. ASU 2016-01: Financial Instruments - Overall (Subtopic 825-10) This ASU makes several modifications to Subtopic 825-10, including the elimination of the available-for-sale classification of equity investments, and it requires equity investments with readily determinable fair values to be measured at fair value with changes in fair value recognized in net income. This standard is applied prospectively as of the beginning of the year of adoption. The adoption of this standard is not expected to have a material impact on our consolidated financial statements. ASU 2016-18: Statement of Cash Flows (Topic 230): Restricted Cash This ASU requires that the change in total cash, cash at beginning of period and cash at end of period on the statement of cash flows include restricted cash and restricted cash equivalents and also requires companies who report cash and restricted cash separately on the balance sheet to reconcile those amounts to the statement of cash flows. This standard is required to be applied retrospectively, which results in the recast of each prior reporting period statement of cash flows presented. The adoption of this standard is not expected to have a material impact on our consolidated financial statements. Impacts to 2017 Results The expected effects of adoption of the New Revenue Standard and New Retirement Standard to our statement of operations for the twelve months ended December 31, 2017 are as follows: New Revenue Standard New Retirement Standard As Reported Deferred Revenue Method Reclassifications Reclassifications As Recast Operating revenues: Passenger $ 36,133 $ 311 $ 2,687 $ — $ 39,131 Cargo 800 — 90 — 890 Other 5,274 — (2,673 ) — 2,601 Total operating revenues 42,207 311 104 — 42,622 Total operating expenses 38,149 — 104 138 38,391 Operating income 4,058 311 — (138 ) 4,231 Total nonoperating expense, net (974 ) — — 138 (836 ) Income before income taxes 3,084 311 — — 3,395 Income tax provision (1) 1,165 948 — — 2,113 Net income $ 1,919 $ (637 ) $ — $ — $ 1,282 Diluted earnings per common share $ 3.90 $ 2.61 (1) The adjustment to the 2017 income tax provision includes an $830 million special charge to reduce our deferred tax asset associated with loyalty program liabilities as a result of H.R. 1, the 2017 Tax Cuts and Jobs Act (the 2017 Tax Act), enacted in December 2017 that reduced the federal corporate income tax rate from 35% to 21% . The expected effects of adoption of the New Revenue Standard to our December 31, 2017 balance sheet are as follows: As Reported New Revenue Standard As Recast Deferred tax asset $ 427 $ 1,389 $ 1,816 Air traffic liability 3,978 64 4,042 Current loyalty program liability 2,791 384 3,175 Noncurrent loyalty program liability — 5,647 5,647 Total stockholders’ equity (deficit) 3,926 (4,706 ) (780 ) Standards Effective for 2019 Reporting Periods ASU 2016-02: Leases (Topic 842) (the New Lease Standard) The New Lease Standard requires lessees to recognize a lease liability and a right-of-use asset on the balance sheet and aligns many of the underlying principles of the new lessor model with those in the New Revenue Standard. The New Lease Standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. We expect we will adopt the New Lease Standard effective January 1, 2019. Entities are required to adopt the New Lease Standard using a modified retrospective approach, which results in the recast of each prior reporting period presented, for all leases existing at or commencing after the date of initial application with an option to use certain practical expedients. We are currently evaluating how the adoption of the New Lease Standard will impact our consolidated financial statements. Interpretations are on-going and could have a material impact on our implementation. Currently, we expect that the adoption of the New Lease Standard will have a material impact on our consolidated balance sheet due to the recognition of right-of-use assets and lease liabilities principally for certain leases currently accounted for as operating leases.
American Airlines, Inc. [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Basis of Presentation and Summary of Significant Accounting Policies	Basis of Presentation and Summary of Significant Accounting Policies (a) Basis of Presentation American Airlines, Inc. (American) is a Delaware corporation whose primary business activity is the operation of a major network air carrier. American is the principal wholly-owned subsidiary of American Airlines Group Inc. (AAG), which owns all of American’s outstanding common stock, par value $1.00 per share. On December 9, 2013, a subsidiary of AMR Corporation (AMR) merged with and into US Airways Group, Inc. (US Airways Group), a Delaware corporation, which survived as a wholly-owned subsidiary of AAG, and AAG emerged from Chapter 11 (the Merger). Upon closing of the Merger and emergence from Chapter 11, AMR changed its name to American Airlines Group Inc. On December 30, 2015, in order to simplify AAG’s internal corporate structure, US Airways, Inc. (US Airways), a wholly-owned subsidiary of US Airways Group, merged with and into American, with American as the surviving corporation. All significant intercompany transactions have been eliminated. The preparation of financial statements in accordance with accounting principles generally accepted in the United States (GAAP) requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The most significant areas of judgment relate to passenger revenue recognition, impairment of goodwill, impairment of long-lived and intangible assets, the loyalty program, valuation allowance for deferred tax assets, as well as pension and retiree medical and other postretirement benefits. (b) Short-term Investments Short-term investments are classified as available-for-sale and stated at fair value. Realized gains and losses are recorded in nonoperating expense on the consolidated statement of operations. Unrealized gains and losses are recorded in accumulated other comprehensive loss on the consolidated balance sheets. (c) Restricted Cash and Short-term Investments American has restricted cash and short-term investments related primarily to collateral held to support workers’ compensation obligations. (d) Aircraft Fuel, Spare Parts and Supplies, Net Aircraft fuel is recorded on a first-in, first-out basis. Spare parts and supplies are recorded at average costs less an allowance for obsolescence. These items are expensed when used. (e) Operating Property and Equipment Operating property and equipment is recorded at cost and depreciated or amortized to residual values over the asset’s estimated useful life or the lease term, whichever is less, using the straight-line method. Residual values for aircraft, engines and related rotable parts are generally 5% to 10% of original cost. Costs of major improvements that enhance the usefulness of the asset are capitalized and depreciated or amortized over the estimated useful life of the asset or the lease term, whichever is less. The estimated useful lives for the principal property and equipment classifications are as follows: Principal Property and Equipment Classification Estimated Useful Life Aircraft, engines and related rotable parts 20 – 30 years Buildings and improvements 5 – 30 years Furniture, fixtures and other equipment 3 – 10 years Capitalized software 5 – 10 years American assesses impairment on operating property and equipment when events and circumstances indicate that the assets may be impaired. An asset or group of assets is considered impaired when the undiscounted cash flows estimated to be generated by the assets are less than the carrying amount of the assets and the net book value of the assets exceeds their estimated fair value. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount or fair value less the cost to sell. Total depreciation and amortization expense was $2.1 billion , $1.8 billion and $1.6 billion for the years ended December 31, 2017 , 2016 and 2015 , respectively. (f) Income Taxes Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are recorded net as noncurrent deferred income taxes. American provides a valuation allowance for its deferred tax assets when it is more likely than not that some portion, or all of its deferred tax assets, will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income. American considers all available positive and negative evidence and makes certain assumptions in evaluating the realizability of its deferred tax assets. Many factors are considered that impact American’s assessment of future profitability, including conditions which are beyond American’s control, such as the health of the economy, the level and volatility of fuel prices and travel demand. (g) Goodwill Goodwill represents the excess of the purchase price over the fair value of the net assets acquired and liabilities assumed. Goodwill is not amortized but assessed for impairment annually on October 1 st or more frequently if events or circumstances indicate that goodwill may be impaired. American has one consolidated reporting unit. Goodwill is assessed for impairment by initially performing a qualitative assessment and, if necessary, then comparing the fair value of the reporting unit to its carrying value, including goodwill. If the fair value of the reporting unit is less than the carrying value, a second step is performed to determine the implied fair value of goodwill. If the implied fair value of goodwill is lower than its carrying value, an impairment charge equal to the difference is recorded. Based upon American’s annual assessment, there was no goodwill impairment in 2017 . The carrying value of the goodwill on American’s consolidated balance sheets was $4.1 billion as of December 31, 2017 and 2016 . (h) Other Intangibles, Net Intangible assets consist primarily of domestic airport slots, customer relationships, marketing agreements, international slots and route authorities, airport gate leasehold rights and tradenames. Finite-Lived Intangible Assets Finite-lived intangible assets are amortized over their respective estimated useful lives and reviewed for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable. The following table provides information relating to American’s amortizable intangible assets as of December 31, 2017 and 2016 (in millions): December 31, 2017 2016 Domestic airport slots $ 365 $ 365 Customer relationships 300 300 Marketing agreements 105 105 Tradenames 35 35 Airport gate leasehold rights 137 137 Accumulated amortization (622 ) (578 ) Total $ 320 $ 364 Certain domestic airport slots and airport gate leasehold rights are amortized on a straight-line basis over 25 years . The customer relationships and marketing agreements were identified as intangible assets subject to amortization and are amortized on a straight-line basis over approximately nine years and 30 years , respectively. Tradenames are fully amortized. American recorded amortization expense related to these intangible assets of $44 million , $76 million and $55 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. American expects to record annual amortization expense for these intangible assets as follows (in millions): 2018 $ 41 2019 41 2020 41 2021 41 2022 41 2023 and thereafter 115 Total $ 320 Indefinite-Lived Intangible Assets Indefinite-lived intangible assets include certain domestic airport slots at American’s hubs and international slots and route authorities. Indefinite-lived intangible assets are not amortized but instead are assessed for impairment annually on October 1 st or more frequently if events or circumstances indicate that the asset may be impaired. As of December 31, 2017 and 2016 , American had $1.9 billion and $1.8 billion , respectively, of indefinite-lived intangible assets on its consolidated balance sheets. Indefinite-lived intangible assets are assessed for impairment by initially performing a qualitative assessment to determine whether American believes it is more likely than not that an asset has been impaired. If American believes impairment has occurred, American then evaluates for impairment by comparing the estimated fair value of assets to the carrying value. An impairment charge is recognized if the asset’s estimated fair value is less than its carrying value. Based upon American’s annual assessment, there was no indefinite-lived intangible asset impairment in 2017 . (i) Loyalty Program American currently operates the loyalty program, AAdvantage. This program awards mileage credits to passengers who fly on American, any one world airline or other partner airlines, or by using the services of other program participants, such as the Citi and Barclaycard US co-branded credit cards, hotels and car rental companies. Mileage credits can be redeemed for travel on American or other participating partner airlines. Through December 31, 2017, American used the incremental cost method to account for the portion of its loyalty program liability incurred when AAdvantage members earn mileage credits by flying on American, any one world airline or other partner airlines. American has an obligation to provide future travel when these mileage credits are redeemed and therefore have recorded a liability for mileage credits outstanding. The incremental cost liability includes all mileage credits, even mileage credits for members whose account balances have not yet reached the minimum level required to redeem an award. Mileage credits are subject to expiration. The liability for outstanding mileage credits is valued based on the estimated incremental cost of carrying one additional passenger. The estimated incremental cost primarily includes unit costs incurred for fuel, food and insurance as well as fees incurred when travel awards are redeemed on partner airlines. In calculating the liability, American estimates how many mileage credits will never be redeemed for travel and excludes those mileage credits from the estimate of the liability. Estimates are also made for the number of miles that will be used per award redemption and the number of travel awards that will be redeemed on partner airlines. These costs and estimates are based on American’s historical program experience as well as consideration of enacted program changes, as applicable. Changes in the liability resulting from members earning additional mileage credits or changes in estimates are recorded in the consolidated statements of operations as a part of passenger revenue. As of December 31, 2017 and 2016 , the liability for outstanding mileage credits accounted for under the incremental cost method was $677 million and $669 million , respectively, and is included on the consolidated balance sheets within loyalty program liability. American also sells loyalty program mileage credits to participating airline partners and non-airline business partners, such as the Citi and Barclaycard US co-branded credit cards. Sales of mileage credits to non-airline business partners is comprised of two components, transportation and marketing. American accounts for mileage sales under its agreements with non-airline business partners in accordance with ASU 2009-13, “Revenue Recognition (Topic 605) — Multiple-Deliverable Revenue Arrangements.” In accordance with ASU 2009-13, American allocates the consideration received from the sale of mileage credits based on the relative selling price of each product or service delivered. As a result of American’s co-branded credit card program agreements with Citi and Barclaycard US that it entered into in 2016, American identified the following revenue elements in these co-branded credit card agreements: the transportation component; and the use of the American brand including access to loyalty program member lists, advertising and other travel related benefits (collectively, the marketing component). The transportation component represents the estimated selling price of future travel awards and is determined using historical transaction information, including information related to customer redemption patterns. The transportation component is deferred based on its relative selling price and is amortized into passenger revenue on a straight-line basis over the period in which the mileage credits are expected to be redeemed for travel. As of December 31, 2017 and 2016 , American had $2.1 billion in deferred revenue from the sale of mileage credits recorded within loyalty program liability on its consolidated balance sheets. The services under the marketing component are provided periodically, but no less than monthly. Accordingly, the marketing component is considered earned and recognized in other revenues in the period of the mileage sale. For the years ended December 31, 2017 , 2016 and 2015 , the marketing component of mileage sales and other marketing related payments included in other revenues was approximately $2.2 billion , $1.9 billion and $1.7 billion , respectively. Effective January 1, 2018, American is adopting ASU 2014-09: Revenue from Contracts with Customers (Topic 606). See Recent Accounting Pronouncements in Note 1(r) below for further discussion. (j) Revenue Passenger Revenue Passenger revenue is recognized when transportation is provided. Ticket sales for transportation that has not yet been provided are initially deferred and recorded as air traffic liability on the consolidated balance sheets. The air traffic liability represents tickets sold for future travel dates and estimated future refunds and exchanges of tickets sold for past travel dates. The balance in the air traffic liability fluctuates throughout the year based on seasonal travel patterns. American’s air traffic liability was $4.0 billion and $3.9 billion as of December 31, 2017 and 2016 , respectively. The majority of tickets sold are nonrefundable. A small percentage of tickets, some of which are partially used tickets, expire unused. Due to complex pricing structures, refund and exchange policies, and interline agreements with other airlines, certain amounts are recognized in passenger revenue using estimates regarding both the timing of the revenue recognition and the amount of revenue to be recognized. These estimates are generally based on the analysis of American’s historical data. American and other airline industry participants have consistently applied this accounting method to estimate revenue from forfeited tickets at the date of travel. Estimated future refunds and exchanges included in the air traffic liability are routinely evaluated based on subsequent activity to validate the accuracy of American’s estimates. Any adjustments resulting from periodic evaluations of the estimated air traffic liability are included in passenger revenue during the period in which the evaluations are completed. Regional carriers provide scheduled air transportation under the brand name American Eagle. American classifies revenues generated from transportation on these carriers as regional passenger revenues. Liabilities related to tickets sold by American for travel on these air carriers are also included in American’s air traffic liability and are subsequently recognized as revenue in the same manner as described above. Passenger Taxes and Fees Various taxes and fees assessed on the sale of tickets to end customers are collected by American as an agent and remitted to taxing authorities. These taxes and fees have been presented on a net basis in the accompanying consolidated statements of operations and recorded as a liability until remitted to the appropriate taxing authority. Cargo Revenue Cargo revenue is recognized when American provides the transportation. Other Revenue Other revenue includes revenue associated with marketing services provided to American’s business partners as part of its loyalty program, baggage fees, ticketing change fees, airport clubs and inflight services. The accounting and recognition for the loyalty program marketing services are discussed in Note 1(i) above. Baggage fees, ticketing change fees, airport clubs and inflight service revenues are recognized when American provides the service. Effective January 1, 2018, American is adopting ASU 2014-09: Revenue from Contracts with Customers (Topic 606). See Recent Accounting Pronouncements in Note 1(r) below for further discussion. (k) Maintenance, Materials and Repairs Maintenance and repair costs for owned and leased flight equipment are charged to operating expense as incurred, except costs incurred for maintenance and repair under flight hour maintenance contract agreements, which are accrued based on contractual terms when an obligation exists. (l) Selling Expenses Selling expenses include credit card fees, commissions, computerized reservations systems fees and advertising. Advertising costs are expensed as incurred. Advertising expense was $135 million , $116 million and $110 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. (m) Share-based Compensation American accounts for its share-based compensation expense based on the fair value of the stock award at the time of grant, which is recognized ratably over the vesting period of the stock award. Certain awards have performance conditions that must be achieved prior to vesting and are expensed based on the expected achievement at each reporting period. The fair value of stock appreciation rights is estimated using a Black-Scholes option pricing model. The fair value of restricted stock units is based on the market price of the underlying shares of common stock on the date of grant. See Note 12 for further discussion of share-based compensation. (n) Deferred Gains and Credits, Net Included within deferred gains and credits, net are amounts deferred and amortized into future periods associated with the adjustment of leases to fair value in connection with the application of acquisition accounting, deferred gains on the sale-leaseback of aircraft and certain vendor incentives. American periodically receives vendor incentives in connection with acquisition of aircraft and engines. These credits are deferred until aircraft and engines are delivered and then applied as a reduction to the cost of the related equipment. (o) Foreign Currency Gains and Losses Foreign currency gains and losses are recorded as part of other nonoperating expense, net in American’s consolidated statements of operations. Foreign currency losses for 2017 were $4 million . Foreign currency gains were $1 million for 2016 . For 2015 , foreign currency losses were $751 million and included a $592 million nonoperating special charge to write off all of the value of Venezuelan bolivars held by American due to continued lack of repatriations and deterioration of economic conditions in Venezuela. (p) Other Operating Expenses Other operating expenses includes costs associated with ground and cargo handling, crew travel, aircraft food and catering, passenger accommodation, airport security, international navigation fees and certain general and administrative expenses. (q) Regional Expenses Expenses associated with American Eagle operations are classified as regional expenses on the consolidated statements of operations. Regional expenses consist of the following (in millions): Year Ended December 31, 2017 2016 2015 Aircraft fuel and related taxes $ 1,382 $ 1,109 $ 1,230 Salaries, wages and benefits 356 327 276 Capacity purchases from third-party regional carriers (1) 3,283 3,186 3,137 Maintenance, materials and repairs 7 4 4 Other rent and landing fees 602 487 434 Aircraft rent 27 28 28 Selling expenses 361 347 333 Depreciation and amortization 262 237 197 Special items, net 3 13 18 Other 289 271 295 Total regional expenses $ 6,572 $ 6,009 $ 5,952 (1) For the years ended December 31, 2017 , 2016 and 2015 , the component of capacity purchase expenses representing the lease of aircraft for accounting purposes was approximately $437 million , $405 million and $492 million , respectively. (r) Recent Accounting Pronouncements Standards Effective for 2018 Reporting Periods Effective January 1, 2018, American is adopting the accounting pronouncements described below. The adoption and related required disclosures will be reported in American’s first quarter 2018 Quarterly Report on Form 10-Q. ASU 2014-09: Revenue from Contracts with Customers (Topic 606) (the New Revenue Standard) The New Revenue Standard applies to all companies that enter into contracts with customers to transfer goods or services. American is adopting the New Revenue Standard using the full retrospective method, which results in the recast of each prior reporting period presented. The adoption of the New Revenue Standard will impact American’s accounting for outstanding mileage credits earned through travel by AAdvantage loyalty program members. There is no change in accounting for sales of mileage credits to co-branded card or other partners as those are currently reported in accordance with the New Revenue Standard. Through December 31, 2017, American used the incremental cost method to account for the portion of its loyalty program liability related to mileage credits earned through travel, which were valued based on the estimated incremental cost of carrying one additional passenger (see (i) Loyalty Program above). The New Revenue Standard requires American to change its policy to the deferred revenue method and apply a relative selling price approach whereby a portion of each passenger ticket sale attributable to mileage credits earned is deferred and recognized in passenger revenue upon future mileage redemption. The value of the earned mileage credits is materially greater under the deferred revenue method than the value attributed to these mileage credits under the incremental cost method. The New Revenue Standard will also require certain reclassifications, principally the reclassification of certain ancillary revenues previously classified and reported as other revenue to passenger revenue and as applicable to cargo revenue. Additionally, the New Revenue Standard requires a gross presentation on the face of American’s statement of operations for certain revenues and expenses that had previously been presented on a net basis. See recast 2017 statement of operations and balance sheet data presented below for the expected effects of adoption. ASU 2017-07: Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (the New Retirement Standard) The New Retirement Standard requires all components of American’s net periodic benefit cost (income), with the exception of service cost, previously reported within operating expenses as salaries, wages and benefits, to be reclassified and reported within nonoperating income (expense). The New Retirement Standard is required to be applied retrospectively, which results in the recast of each prior reporting period presented. The adoption of the New Retirement Standard has no impact on pre-tax income or net income reported. See recast 2017 statement of operations data presented below for the expected effects of adoption. ASU 2016-01: Financial Instruments - Overall (Subtopic 825-10) This ASU makes several modifications to Subtopic 825-10, including the elimination of the available-for-sale classification of equity investments, and it requires equity investments with readily determinable fair values to be measured at fair value with changes in fair value recognized in net income. This standard is applied prospectively as of the beginning of the year of adoption. The adoption of this standard is not expected to have a material impact on American’s consolidated financial statements. ASU 2016-18: Statement of Cash Flows (Topic 230): Restricted Cash This ASU requires that the change in total cash, cash at beginning of period and cash at end of period on the statement of cash flows include restricted cash and restricted cash equivalents and also requires companies who report cash and restricted cash separately on the balance sheet to reconcile those amounts to the statement of cash flows. This standard is required to be applied retrospectively, which results in the recast of each prior reporting period statement of cash flows presented. The adoption of this standard is not expected to have a material impact on American’s consolidated financial statements. Impacts to 2017 Results The expected effects of adoption of the New Revenue Standard and New Retirement Standard to American’s statement of operations for the twelve months ended December 31, 2017 are as follows: New Revenue Standard New Retirement Standard As Reported Deferred Revenue Method Reclassifications Reclassifications As Recast Operating revenues: Passenger $ 36,133 $ 311 $ 2,687 $ — $ 39,131 Cargo 800 — 90 — 890 Other 5,262 — (2,673 ) — 2,589 Total operating revenues 42,195 311 104 — 42,610 Total operating expenses 38,163 — 104 138 38,405 Operating income 4,032 311 — (138 ) 4,205 Total nonoperating expense, net (788 ) — — 138 (650 ) Income before income taxes 3,244 311 — — 3,555 Income tax provision (1) 1,322 948 — — 2,270 Net income $ 1,922 $ (637 ) $ — $ — $ 1,285 (1) The adjustment to the 2017 income tax provision includes an $830 million special charge to reduce American’s deferred tax asset associated with loyalty program liabilities as a result of H.R. 1, the 2017 Tax Cuts and Jobs Act (the 2017 Tax Act), enacted in December 2017 that reduced the federal corporate income tax rate from 35% to 21% . The expected effects of adoption of the New Revenue Standard to American’s December 31, 2017 balance sheet are as follows: As Reported New Revenue Standard As Recast Deferred tax asset $ 682 $ 1,389 $ 2,071 Air traffic liability 3,978 64 4,042 Current loyalty program liability 2,791 384 3,175 Noncurrent loyalty program liability — 5,647 5,647 Total stockholder’s equity (deficit) 14,594 (4,706 ) 9,888 Standards Effective for 2019 Reporting Periods ASU 2016-02: Leases (Topic 842) (the New Lease Standard) The New Lease Standard requires lessees to recognize a lease liability and a right-of-use asset on the balance sheet and aligns many of the underlying principles of the new lessor model with those in the New Revenue Standard. The New Lease Standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. American expects it will adopt the New Lease Standard effective January 1, 2019. Entities are required to adopt the New Lease Standard using a modified retrospective approach, which results in the recast of each prior reporting period presented, for all leases existing at or commencing after the date of initial application with an option to use certain practical expedients. American is currently evaluating how the adoption of the New Lease Standard will impact its consolidated financial statements. Interpretations are on-going and could have a material impact on its implementation. Currently, American expects that the adoption of the New Lease Standard will have a material impact on its consolidated balance sheet due to the recognition of right-of-use assets and lease liabilities principally for certain leases currently accounted for as operating leases.

Special Items, Net

Special Items, Net	12 Months Ended
	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Special Items, Net	Special Items, Net Special items, net on the consolidated statements of operations consisted of the following (in millions): Year Ended December 31, 2017 2016 2015 Merger integration expenses (1) $ 273 $ 514 $ 826 Fleet restructuring expenses (2) 232 177 210 Employee 2017 Tax Act bonus expense (3) 123 — — Labor contract expenses (4) 46 — — Mark-to-market adjustments for bankruptcy obligations 27 25 (53 ) Other operating charges (credits), net 11 (7 ) 68 Mainline operating special items, net 712 709 1,051 Regional operating special items, net 22 14 29 Operating special items, net 734 723 1,080 Debt refinancing and extinguishment charges 22 49 24 Venezuela foreign currency losses — — 592 Other nonoperating charges (credits), net — — (22 ) Nonoperating special items, net 22 49 594 Impact of the 2017 Tax Act on deferred tax assets and liabilities (7 ) — — Release of deferred tax valuation allowance — — (3,040 ) Other tax charges — — 25 Income tax special items, net (7 ) — (3,015 ) (1) Merger integration expenses included costs related to information technology, professional fees, re-branding of aircraft and airport facilities and training, and in 2016, also included costs related to alignment of labor union contracts, the launch of re-branded uniforms, relocation and severance, and in 2015, also included share-based compensation related to awards granted in connection with the Merger that fully vested in December 2015. (2) Fleet restructuring expenses, driven in part by the Merger, principally included the acceleration of depreciation, impairments, remaining lease payments and lease return costs for aircraft and related equipment grounded or expected to be grounded earlier than planned. (3) Employee bonus expense included costs related to the $1,000 cash bonus and associated payroll taxes granted to mainline employees as of December 31, 2017 in recognition of the 2017 Tax Act. (4) Labor contract expenses primarily included one-time charges to adjust the vacation accruals for pilots and flight attendants as a result of the mid-contract pay rate adjustments effective in the second quarter of 2017.
American Airlines, Inc. [Member]
Restructuring Cost and Reserve [Line Items]
Special Items, Net	Special Items, Net Special items, net on the consolidated statements of operations consisted of the following (in millions): Year Ended December 31, 2017 2016 2015 Merger integration expenses (1) $ 273 $ 514 $ 826 Fleet restructuring expenses (2) 232 177 210 Employee 2017 Tax Act bonus expense (3) 123 — — Labor contract expenses (4) 46 — — Mark-to-market adjustments for bankruptcy obligations 27 25 (53 ) Other operating charges (credits), net 11 (7 ) 68 Mainline operating special items, net 712 709 1,051 Regional operating special items, net 3 13 18 Operating special items, net 715 722 1,069 Debt refinancing and extinguishment charges 22 49 24 Venezuela foreign currency losses — — 592 Nonoperating special items, net 22 49 616 Impact of the 2017 Tax Act on deferred tax assets and liabilities 93 — — Release of deferred tax valuation allowance — — (3,493 ) Other tax charges — — 25 Income tax special items, net 93 — (3,468 ) (1) Merger integration expenses included costs related to information technology, professional fees, re-branding of aircraft and airport facilities and training, and in 2016, also included costs related to alignment of labor union contracts, the launch of re-branded uniforms, relocation and severance, and in 2015, also included share-based compensation related to awards granted in connection with the Merger that fully vested in December 2015. (2) Fleet restructuring expenses, driven in part by the Merger, principally included the acceleration of depreciation, impairments, remaining lease payments and lease return costs for aircraft and related equipment grounded or expected to be grounded earlier than planned. (3) Employee bonus expense included costs related to the $1,000 cash bonus and associated payroll taxes granted to mainline employees as of December 31, 2017 in recognition of the 2017 Tax Act. (4) Labor contract expenses primarily included one-time charges to adjust the vacation accruals for pilots and flight attendants as a result of the mid-contract pay rate adjustments effective in the second quarter of 2017.

Earnings Per Common Share

Earnings Per Common Share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share The following table sets forth the computation of basic and diluted earnings per common share (EPS) (in millions, except share and per share amounts): Year Ended December 31, 2017 2016 2015 Basic EPS: Net income $ 1,919 $ 2,676 $ 7,610 Weighted average common shares outstanding (in thousands) 489,164 552,308 668,393 Basic EPS $ 3.92 $ 4.85 $ 11.39 Diluted EPS: Net income for purposes of computing diluted EPS $ 1,919 $ 2,676 $ 7,610 Share computation for diluted EPS (in thousands): Basic weighted average common shares outstanding 489,164 552,308 668,393 Dilutive effect of stock awards 2,528 3,791 18,962 Diluted weighted average common shares outstanding 491,692 556,099 687,355 Diluted EPS $ 3.90 $ 4.81 $ 11.07 Restricted stock unit awards excluded from the calculation of diluted EPS because inclusion would be antidilutive (in thousands) 328 1,429 764

Share Repurchase Programs and D

Share Repurchase Programs and Dividends	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Share Repurchase Programs and Dividends	Share Repurchase Programs and Dividends Since July 2014, our Board of Directors has approved six share repurchase programs aggregating $11.0 billion of authority. As of December 31, 2017 , $450 million remained unused under a repurchase program that expires on December 31, 2018. Share repurchases under our repurchase programs may be made through a variety of methods, which may include open market purchases, privately negotiated transactions, block trades or accelerated share repurchase transactions. Any such repurchases will be made from time to time subject to market and economic conditions, applicable legal requirements and other relevant factors. We are not obligated to repurchase any specific number of shares and our repurchase of common stock may be limited, suspended or discontinued at any time at our discretion. During the year ended December 31, 2017 , we repurchased 33.9 million shares of AAG common stock for $1.6 billion at a weighted average cost per share of $45.68 . During the year ended December 31, 2016 , we repurchased 119.8 million shares of AAG common stock for $4.4 billion at a weighted average cost per share of $36.86 . During the year ended December 31, 2015 , we repurchased 85.1 million shares of AAG common stock for $3.6 billion at a weighted average cost per share of $42.09 . Since the inception of the share repurchase programs in July 2014 through December 31, 2017, we have repurchased 262.3 million shares of AAG common stock for $10.6 billion at a weighted average cost per share of $40.22 . Our Board of Directors declared quarterly cash dividends of $0.10 per share totaling $198 million , $224 million and $269 million in 2017 , 2016 and 2015 , respectively. Any future dividends that may be declared and paid from time to time will be subject to market and economic conditions, applicable legal requirements and other relevant factors. We are not obligated to continue a dividend for any fixed period, and the payment of dividends may be suspended at any time at our discretion.

Debt

Debt	12 Months Ended
	Dec. 31, 2017
Debt Instrument [Line Items]
Debt	Debt Long-term debt and capital lease obligations included in the consolidated balance sheets consisted of (in millions): December 31, 2017 2016 Secured 2013 Credit Facilities, variable interest rate of 3.55%, installments through 2020 (a) $ 1,825 $ 1,843 2014 Credit Facilities, variable interest rate of 3.43%, installments through 2021 (a) 728 735 April 2016 Credit Facilities, variable interest rate of 3.57%, installments through 2023 (a) 990 1,000 December 2016 Credit Facilities, variable interest rate of 3.48%, installments through 2023 (a) 1,238 1,250 Aircraft enhanced equipment trust certificates (EETCs), fixed interest rates ranging from 3.00% to 9.75%, averaging 4.30%, maturing from 2018 to 2029 (b) 11,881 10,912 Equipment loans and other notes payable, fixed and variable interest rates ranging from 2.34% to 8.48%, averaging 3.29%, maturing from 2018 to 2029 (c) 5,259 5,343 Special facility revenue bonds, fixed interest rates ranging from 5.00% to 8.00%, maturing from 2018 to 2035 857 891 Other secured obligations, fixed interest rates ranging from 3.81% to 12.24%, maturing from 2018 to 2028 773 849 23,551 22,823 Unsecured 5.50% senior notes, interest only payments until due in 2019 (d) 750 750 6.125% senior notes, interest only payments until due in 2018 (d) 500 500 4.625% senior notes, interest only payments until due in 2020 (d) 500 500 1,750 1,750 Total long-term debt and capital lease obligations 25,301 24,573 Less: Total unamortized debt discount, premium and issuance costs 236 229 Less: Current maturities 2,554 1,855 Long-term debt and capital lease obligations, net of current maturities $ 22,511 $ 22,489 The table below shows the maximum availability under revolving credit facilities, all of which were undrawn, as of December 31, 2017 (in millions): 2013 Revolving Facility $ 1,200 2014 Revolving Facility 1,000 April 2016 Revolving Facility 300 Total $ 2,500 Secured financings are collateralized by assets, primarily aircraft, engines, simulators, aircraft spare parts, airport gate leasehold rights, route authorities and airport slots. At December 31, 2017 , we were operating 33 aircraft under capital leases. Leases can generally be renewed at rates based on fair market value at the end of the lease term for a number of additional years. At December 31, 2017 , the maturities of long-term debt and capital lease obligations are as follows (in millions): 2018 $ 2,598 2019 2,868 2020 4,069 2021 2,856 2022 1,288 2023 and thereafter 11,622 Total $ 25,301 (a) 2013, 2014, April 2016 and December 2016 Credit Facilities 2013 Credit Facilities In March 2017, American and AAG entered into the Second Amendment to the Amended and Restated Credit and Guaranty Agreement, amending the Amended and Restated Credit and Guaranty Agreement dated as of May 21, 2015 (which amended and restated the Credit and Guaranty Agreement dated as of June 27, 2013), as previously amended by the First Amendment to Amended and Restated Credit and Guaranty Agreement dated as of October 26, 2015, pursuant to which AAG refinanced the $1.8 billion term loan facility due June 2020 established thereunder (the 2013 Term Loan Facility and, together with the $1.4 billion revolving credit facility established under such agreement (the 2013 Revolving Facility), the 2013 Credit Facilities) to reduce the LIBOR margin from 2.50% to 2.00% and the base rate margin from 1.50% to 1.00% . In August 2017, American and AAG entered into the Third Amendment to the Amended and Restated Credit and Guaranty Agreement pursuant to which the maturity date of the 2013 Revolving Facility was extended to October 2022, the LIBOR margin thereon was reduced from 3.00% to 2.25% , and the maximum principal amount of such facility was reduced to $1.2 billion . 2014 Credit Facilities In June 2017, American and AAG entered into the Third Amendment to the Amended and Restated Credit and Guaranty Agreement, amending the Amended and Restated Credit and Guaranty Agreement dated as of April 20, 2015 (which amended and restated the Credit and Guaranty Agreement dated as of October 10, 2014), as previously amended by the First Amendment to Amended and Restated Credit and Guaranty Agreement dated as of October 26, 2015 and the Second Amendment to Amended and Restated Credit and Guaranty Agreement dated as of September 22, 2016, pursuant to which AAG refinanced the $735 million term loan facility due October 2021 established thereunder (the 2014 Term Loan Facility and, together with the $1.025 billion revolving credit facility established under such agreement (the 2014 Revolving Facility), the 2014 Credit Facilities) to reduce the LIBOR margin from 2.50% to 2.00% and the base rate margin from 1.50% to 1.00% . In August 2017, American and AAG entered into the Fourth Amendment to the Amended and Restated Credit and Guaranty Agreement pursuant to which the maturity date of the 2014 Revolving Facility was extended to October 2022, the LIBOR margin thereon was reduced from 3.00% to 2.25% , and the maximum principal amount of such facility was reduced to $1.0 billion . April 2016 Credit Facilities In August 2017, American and AAG entered into the Second Amendment to the Credit and Guaranty Agreement, amending the Credit and Guaranty Agreement dated as of April 29, 2016 (the April 2016 Credit Facilities), as previously amended by the First Amendment to the Credit and Guaranty Agreement, dated as of October 31, 2016, pursuant to which a new $300 million revolving credit facility (the April 2016 Revolving Facility) was established with a maturity date of October 2022 and a LIBOR margin of 2.25% . In November 2017, American and AAG entered into the Third Amendment to the Credit and Guaranty Agreement, amending the April 2016 Credit Facilities, pursuant to which AAG refinanced the $990 million term loan facility due April 2023 established thereunder (the April 2016 Term Loan Facility), to reduce the LIBOR margin from 2.50% to 2.00% and the base rate margin from 1.50% to 1.00% . December 2016 Credit Facilities In November 2017, American and AAG entered into the First Amendment to the Amended and Restated Credit and Guaranty Agreement, amending the Amended and Restated Credit and Guaranty Agreement, dated as of December 15, 2016, pursuant to which AAG refinanced the $1.25 billion term loan facility due December 2023 established thereunder (the December 2016 Term Loan Facility), to reduce the LIBOR margin from 2.50% to 2.00% and the base rate margin from 1.50% to 1.00% . Certain details of our 2013, 2014, April 2016 and December 2016 Credit Facilities (collectively referred to as the Credit Facilities) are shown in the table below as of December 31, 2017 : 2013 Credit Facilities 2014 Credit Facilities April 2016 Credit Facilities December 2016 Credit Facilities 2013 Term Loan 2013 Revolving Facility 2014 Term Loan 2014 Revolving Facility April 2016 Term Loan April 2016 Revolving Facility December 2016 Term Loan Aggregate principal issued or credit facility availability (in millions) $1,900 $1,200 $750 $1,000 $1,000 $300 $1,250 Principal outstanding or drawn (in millions) $1,825 $— $728 $— $990 $— $1,238 Maturity date June 2020 October 2022 October 2021 October 2022 April 2023 October 2022 December 2023 LIBOR margin 2.00% 2.25% 2.00% 2.25% 2.00% 2.25% 2.00% The Term Loans are repayable in annual installments in an amount equal to 1.00% of the aggregate principal amount issued, with any unpaid balance due on the respective maturity dates. Voluntary prepayments may be made by American at any time. The 2013, 2014 and April 2016 Revolving Facilities provide that American may from time to time borrow, repay and reborrow loans thereunder. The 2013 and 2014 Revolving Facilities have the ability to issue letters of credit thereunder in an aggregate amount outstanding at any time up to $150 million and $300 million , respectively. The 2013, 2014 and April 2016 Revolving Facilities are each subject to an undrawn annual fee of 0.75% . As of December 31, 2017 , there were no borrowings or letters of credit outstanding under the 2013, 2014 or April 2016 Revolving Facilities. The December 2016 Credit Facilities provide for a revolving credit facility that may be established in the future. Subject to certain limitations and exceptions, the Credit Facilities are secured by collateral, including certain spare parts, certain slots, certain route authorities, certain simulators and certain leasehold rights. American has the ability to make future modifications to the collateral pledged, subject to certain restrictions. American’s obligations under the Credit Facilities are guaranteed by AAG. American is required to maintain a certain minimum ratio of appraised value of the collateral to the outstanding loans as further described below in “Collateral-Related Covenants.” The Credit Facilities contain events of default customary for similar financings, including cross default to other material indebtedness. Upon the occurrence of an event of default, the outstanding obligations may be accelerated and become due and payable immediately. In addition, if a “change of control” occurs, American will (absent an amendment or waiver) be required to repay at par the loans outstanding under the Credit Facilities and terminate the 2013, 2014 and April 2016 Revolving Facilities and any revolving credit facilities established under the December 2016 Credit Facilities. The Credit Facilities also include covenants that, among other things, require AAG to maintain a minimum aggregate liquidity (as defined in the Credit Facilities) of not less than $2.0 billion , and limit the ability of AAG and its restricted subsidiaries to pay dividends and make certain other payments, make certain investments, incur additional indebtedness, incur liens on the collateral, dispose of the collateral, enter into certain affiliate transactions and engage in certain business activities, in each case subject to certain exceptions. (b) EETCs 2016-3 EETCs During the first quarter of 2017, all remaining net proceeds of the Series 2016-3 Class AA and Class A EETCs (the 2016-3 EETCs), in the amount of $109 million , were used to purchase equipment notes issued by American in connection with the financing of two of the 25 aircraft financed under the 2016-3 EETCs (such 25 aircraft, the 2016-3 Aircraft). In October 2017, American created one additional pass-through trust which issued approximately $193 million aggregate principal amount of Series 2016-3 Class B EETCs (the 2016-3 Class B EETCs) in connection with the financing of the 2016-3 Aircraft. The proceeds received from the sale of the 2016-3 Class B EETCs were used on the date of issuance of the 2016-3 Class B EETCs to acquire Series B equipment notes issued by American in connection with the financing of the 2016-3 Aircraft. Interest and principal payments on equipment notes issued in connection with the 2016-3 EETCs are payable semi-annually in April and October of each year, with interest payments that began in April 2017 and principal payments that began in October 2017 for the Class AA and Class A EETCs and interest and principal payments beginning in April 2018 for the Class B EETCs. These equipment notes are secured by liens on the 2016-3 Aircraft. Certain information regarding the 2016-3 EETC equipment notes, as of December 31, 2017 , is set forth in the table below. 2016-3 EETCs Series AA Series A Series B Aggregate principal issued $558 million $256 million $193 million Fixed interest rate per annum 3.00% 3.25% 3.75% Maturity date October 2028 October 2028 October 2025 2017-1 EETCs In January 2017, American created three pass-through trusts which issued approximately $983 million aggregate principal amount of Series 2017-1 Class AA, Class A and Class B EETCs (the 2017-1 EETCs) in connection with the financing of 24 aircraft delivered to American through May 2017 (the 2017-1 Aircraft). During the first six months of 2017, all of the net proceeds received from the sale of the 2017-1 EETCs were used to purchase equipment notes issued by American in connection with the financing of the 2017-1 Aircraft. Interest and principal payments on equipment notes issued in connection with the 2017-1 EETCs are payable semi-annually in February and August of each year, with interest payments that began in August 2017 and principal payments beginning in February 2018. These equipment notes are secured by liens on the 2017-1 Aircraft. Certain information regarding the 2017-1 EETC equipment notes, as of December 31, 2017 , is set forth in the table below. 2017-1 EETCs Series AA Series A Series B Aggregate principal issued $537 million $248 million $198 million Fixed interest rate per annum 3.65% 4.00% 4.95% Maturity date February 2029 February 2029 February 2025 2017-2 EETCs In August 2017, American created two pass-through trusts which issued approximately $797 million aggregate principal amount of Series 2017-2 Class AA and Class A EETCs (the 2017-2 EETCs) in connection with the financing of 30 aircraft previously delivered to American or scheduled to be delivered to American through April 2018 (the 2017-2 Aircraft). A portion of the net proceeds received from the sale of the 2017-2 EETCs has been used to acquire Series AA and A equipment notes issued by American to the pass-through trusts and the balance of such proceeds is being held in escrow for the benefit of the holders of the 2017-2 EETCs until such time as American issues additional Series AA and A equipment notes to the pass-through trusts, which trusts will purchase such additional equipment notes with the escrowed funds. These escrowed funds are not guaranteed by American and are not reported as debt on our consolidated balance sheet because the proceeds held by the depository are not American’s assets. In October 2017, American created one additional pass-through trust which issued approximately $221 million aggregate principal amount of Series 2017-2 Class B EETCs (the 2017-2 Class B EETCs) in connection with the financing of the 2017-2 Aircraft. A portion of the net proceeds received from the sale of the Series 2017-2 Class B EETCs was used on the date of issuance of the 2017-2 Class B EETCs to acquire Series B equipment notes issued by American in connection with the financing of certain 2017-2 Aircraft, and the balance of such proceeds is being held in escrow for the benefit of the holders of the 2017-2 Class B EETCs until such time as American issues additional Series B equipment notes to the pass-through trust, which will purchase such additional equipment notes with a portion of the escrowed funds. These escrowed funds are not guaranteed by American and are not reported as debt on our consolidated balance sheet because the proceeds held by the depository are not American’s assets. As of December 31, 2017 , approximately $735 million of the escrowed proceeds from the 2017-2 EETCs have been used to purchase equipment notes issued by American. Interest and principal payments on equipment notes issued in connection with the 2017-2 EETCs are payable semi-annually in April and October of each year, with interest payments beginning in April 2018 and principal payments beginning in October 2018. These equipment notes are secured by liens on the aircraft financed with the proceeds of the 2017-2 EETCs. Certain information regarding the 2017-2 EETC equipment notes and the remaining escrowed proceeds of the 2017-2 EETCs, as of December 31, 2017 , is set forth in the table below. 2017-2 EETCs Series AA Series A Series B Aggregate principal issued $545 million $252 million $221 million Remaining escrowed proceeds $152 million $70 million $61 million Fixed interest rate per annum 3.35% 3.60% 3.70% Maturity date October 2029 October 2029 October 2025 (c) Equipment Loans and Other Notes Payable Issued in 2017 In 2017 , American entered into agreements under which it borrowed $1.0 billion in connection with the financing of certain aircraft. Debt incurred under these agreements matures in 2027 through 2029 and bears interest at fixed and variable rates of LIBOR plus an applicable margin averaging 3.08% at December 31, 2017 . (d) Senior Notes The details of our 6.125% , 5.50% and 4.625% senior notes are shown in the table below as of December 31, 2017 : 6.125% Senior Notes 5.50% Senior Notes 4.625% Senior Notes Aggregate principal issued and outstanding $500 million $750 million $500 million Maturity date June 2018 October 2019 March 2020 Fixed interest rate per annum 6.125% 5.50% 4.625% Interest payments Semi-annually in arrears in June and December Semi-annually in arrears in April and October Semi-annually in arrears in March and September The 6.125%, 5.50% and 4.625% senior notes are senior unsecured obligations of AAG. The senior notes are fully and unconditionally guaranteed by American. The indentures for the senior notes contain covenants and events of default generally customary for similar financings. In addition, if we experience specific kinds of changes of control, we must offer to repurchase the senior notes at a price of 101% of the principal amount plus accrued and unpaid interest, if any, to (but not including) the repurchase date. Upon the occurrence of certain events of default, the senior notes may be accelerated and become due and payable. Guarantees As of December 31, 2017 , AAG had issued guarantees covering approximately $810 million of American’s special facility revenue bonds (and interest thereon) and $8.5 billion of American’s secured debt (and interest thereon), including the Credit Facilities and certain EETC financings. Collateral-Related Covenants Certain of our debt financing agreements contain loan to value (LTV) ratio covenants and require us to annually appraise the related collateral. Pursuant to such agreements, if the LTV ratio exceeds a specified threshold, we are required, as applicable, to pledge additional qualifying collateral (which in some cases may include cash collateral), or pay down such financing, in whole or in part. Specifically, we are required to meet certain collateral coverage tests on an annual basis for four credit facilities, as described below: 2013 Credit Facilities 2014 Credit Facilities April 2016 Credit Facilities December 2016 Credit Facilities Frequency of Appraisals of Appraised Collateral Annual Annual Annual Annual LTV Requirement 1.6x Collateral valuation to amount of debt outstanding (62.5% LTV) 1.6x Collateral valuation to amount of debt outstanding (62.5% LTV) 1.6x Collateral valuation to amount of debt outstanding (62.5% LTV) 1.6x Collateral valuation to amount of debt outstanding (62.5% LTV) LTV as of Last Measurement Date 33.9% 23.1% 42.7% 59.0% Collateral Description Generally, certain slots, route authorities, and airport gate leasehold rights used by American to operate all services between the U.S. and South America Generally, certain slots, route authorities and airport gate leasehold rights used by American to operate certain services between the U.S. and London Heathrow Generally, certain spare parts Generally, certain Ronald Reagan Washington National Airport (DCA) slots, certain La Guardia Airport (LGA) slots, certain simulators and certain leasehold rights At December 31, 2017 , we were in compliance with the applicable collateral coverage tests as of the most recent measurement dates.
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Debt	Debt Long-term debt and capital lease obligations included in the consolidated balance sheets consisted of (in millions): December 31, 2017 2016 Secured 2013 Credit Facilities, variable interest rate of 3.55%, installments through 2020 (a) $ 1,825 $ 1,843 2014 Credit Facilities, variable interest rate of 3.43%, installments through 2021 (a) 728 735 April 2016 Credit Facilities, variable interest rate of 3.57%, installments through 2023 (a) 990 1,000 December 2016 Credit Facilities, variable interest rate of 3.48%, installments through 2023 (a) 1,238 1,250 Aircraft enhanced equipment trust certificates (EETCs), fixed interest rates ranging from 3.00% to 9.75%, averaging 4.30%, maturing from 2018 to 2029 (b) 11,881 10,912 Equipment loans and other notes payable, fixed and variable interest rates ranging from 2.34% to 8.48%, averaging 3.29%, maturing from 2018 to 2029 (c) 5,259 5,343 Special facility revenue bonds, fixed interest rates ranging from 5.00% to 5.50%, maturing from 2018 to 2035 828 862 Other secured obligations, fixed interest rates ranging from 3.81% to 12.24%, maturing from 2018 to 2028 772 848 Total long-term debt and capital lease obligations 23,521 22,793 Less: Total unamortized debt discount, premium and issuance costs 227 216 Less: Current maturities 2,058 1,859 Long-term debt and capital lease obligations, net of current maturities $ 21,236 $ 20,718 The table below shows the maximum availability under revolving credit facilities, all of which were undrawn, as of December 31, 2017 (in millions): 2013 Revolving Facility $ 1,200 2014 Revolving Facility 1,000 April 2016 Revolving Facility 300 Total $ 2,500 Secured financings are collateralized by assets, primarily aircraft, engines, simulators, aircraft spare parts, airport gate leasehold rights, route authorities and airport slots. At December 31, 2017 , American was operating 33 aircraft under capital leases. Leases can generally be renewed at rates based on fair market value at the end of the lease term for a number of additional years. At December 31, 2017 , the maturities of long-term debt and capital lease obligations are as follows (in millions): 2018 $ 2,098 2019 2,118 2020 3,563 2021 2,854 2022 1,286 2023 and thereafter 11,602 Total $ 23,521 (a) 2013, 2014, April 2016 and December 2016 Credit Facilities 2013 Credit Facilities In March 2017, American and AAG entered into the Second Amendment to the Amended and Restated Credit and Guaranty Agreement, amending the Amended and Restated Credit and Guaranty Agreement dated as of May 21, 2015 (which amended and restated the Credit and Guaranty Agreement dated as of June 27, 2013), as previously amended by the First Amendment to Amended and Restated Credit and Guaranty Agreement dated as of October 26, 2015, pursuant to which AAG refinanced the $1.8 billion term loan facility due June 2020 established thereunder (the 2013 Term Loan Facility and, together with the $1.4 billion revolving credit facility established under such agreement (the 2013 Revolving Facility), the 2013 Credit Facilities) to reduce the LIBOR margin from 2.50% to 2.00% and the base rate margin from 1.50% to 1.00% . In August 2017, American and AAG entered into the Third Amendment to the Amended and Restated Credit and Guaranty Agreement pursuant to which the maturity date of the 2013 Revolving Facility was extended to October 2022, the LIBOR margin thereon was reduced from 3.00% to 2.25% , and the maximum principal amount of such facility was reduced to $1.2 billion . 2014 Credit Facilities In June 2017, American and AAG entered into the Third Amendment to the Amended and Restated Credit and Guaranty Agreement, amending the Amended and Restated Credit and Guaranty Agreement dated as of April 20, 2015 (which amended and restated the Credit and Guaranty Agreement dated as of October 10, 2014), as previously amended by the First Amendment to Amended and Restated Credit and Guaranty Agreement dated as of October 26, 2015 and the Second Amendment to Amended and Restated Credit and Guaranty Agreement dated as of September 22, 2016, pursuant to which AAG refinanced the $735 million term loan facility due October 2021 established thereunder (the 2014 Term Loan Facility and, together with the $1.025 billion revolving credit facility established under such agreement (the 2014 Revolving Facility), the 2014 Credit Facilities) to reduce the LIBOR margin from 2.50% to 2.00% and the base rate margin from 1.50% to 1.00% . In August 2017, American and AAG entered into the Fourth Amendment to the Amended and Restated Credit and Guaranty Agreement pursuant to which the maturity date of the 2014 Revolving Facility was extended to October 2022, the LIBOR margin thereon was reduced from 3.00% to 2.25% , and the maximum principal amount of such facility was reduced to $1.0 billion . April 2016 Credit Facilities In August 2017, American and AAG entered into the Second Amendment to the Credit and Guaranty Agreement, amending the Credit and Guaranty Agreement dated as of April 29, 2016 (the April 2016 Credit Facilities), as previously amended by the First Amendment to the Credit and Guaranty Agreement, dated as of October 31, 2016, pursuant to which a new $300 million revolving credit facility (the April 2016 Revolving Facility) was established with a maturity date of October 2022 and a LIBOR margin of 2.25% . In November 2017, American and AAG entered into the Third Amendment to the Credit and Guaranty Agreement, amending the April 2016 Credit Facilities, pursuant to which AAG refinanced the $990 million term loan facility due April 2023 established thereunder (the April 2016 Term Loan Facility), to reduce the LIBOR margin from 2.50% to 2.00% and the base rate margin from 1.50% to 1.00% . December 2016 Credit Facilities In November 2017, American and AAG entered into the First Amendment to the Amended and Restated Credit and Guaranty Agreement, amending the Amended and Restated Credit and Guaranty Agreement, dated as of December 15, 2016, pursuant to which AAG refinanced the $1.25 billion term loan facility due December 2023 established thereunder (the December 2016 Term Loan Facility), to reduce the LIBOR margin from 2.50% to 2.00% and the base rate margin from 1.50% to 1.00% . Certain details of American’s 2013, 2014, April 2016 and December 2016 Credit Facilities (collectively referred to as the Credit Facilities) are shown in the table below as of December 31, 2017 : 2013 Credit Facilities 2014 Credit Facilities April 2016 Credit Facilities December 2016 Credit Facilities 2013 Term 2013 Revolving 2014 Term 2014 Revolving April 2016 April 2016 December Aggregate principal issued or credit facility availability $1,900 $1,200 $750 $1,000 $1,000 $300 $1,250 Principal outstanding or drawn (in millions) $1,825 $— $728 $— $990 $— $1,238 Maturity date June 2020 October 2022 October 2021 October 2022 April 2023 October 2022 December 2023 LIBOR margin 2.00% 2.25% 2.00% 2.25% 2.00% 2.25% 2.00% The Term Loans are repayable in annual installments in an amount equal to 1.00% of the aggregate principal amount issued, with any unpaid balance due on the respective maturity dates. Voluntary prepayments may be made by American at any time. The 2013, 2014 and April 2016 Revolving Facilities provide that American may from time to time borrow, repay and reborrow loans thereunder. The 2013 and 2014 Revolving Facilities have the ability to issue letters of credit thereunder in an aggregate amount outstanding at any time up to $150 million and $300 million , respectively. The 2013, 2014 and April 2016 Revolving Facilities are each subject to an undrawn annual fee of 0.75% . As of December 31, 2017 , there were no borrowings or letters of credit outstanding under the 2013, 2014 or April 2016 Revolving Facilities. The December 2016 Credit Facilities provide for a revolving credit facility that may be established in the future. Subject to certain limitations and exceptions, the Credit Facilities are secured by collateral, including certain spare parts, certain slots, certain route authorities, certain simulators and certain leasehold rights. American has the ability to make future modifications to the collateral pledged, subject to certain restrictions. American’s obligations under the Credit Facilities are guaranteed by AAG. American is required to maintain a certain minimum ratio of appraised value of the collateral to the outstanding loans as further described below in “Collateral-Related Covenants.” The Credit Facilities contain events of default customary for similar financings, including cross default to other material indebtedness. Upon the occurrence of an event of default, the outstanding obligations may be accelerated and become due and payable immediately. In addition, if a “change of control” occurs, American will (absent an amendment or waiver) be required to repay at par the loans outstanding under the Credit Facilities and terminate the 2013, 2014 and April 2016 Revolving Facilities and any revolving credit facilities established under the December 2016 Credit Facilities. The Credit Facilities also include covenants that, among other things, require AAG to maintain a minimum aggregate liquidity (as defined in the Credit Facilities) of not less than $2.0 billion , and limit the ability of AAG and its restricted subsidiaries to pay dividends and make certain other payments, make certain investments, incur additional indebtedness, incur liens on the collateral, dispose of the collateral, enter into certain affiliate transactions and engage in certain business activities, in each case subject to certain exceptions. (b) EETCs 2016-3 EETCs During the first quarter of 2017, all remaining net proceeds of the Series 2016-3 Class AA and Class A EETCs (the 2016-3 EETCs), in the amount of $109 million , were used to purchase equipment notes issued by American in connection with the financing of two of the 25 aircraft financed under the 2016-3 EETCs (such 25 aircraft, the 2016-3 Aircraft). In October 2017, American created one additional pass-through trust which issued approximately $193 million aggregate principal amount of Series 2016-3 Class B EETCs (the 2016-3 Class B EETCs) in connection with the financing of the 2016-3 Aircraft. The proceeds received from the sale of the 2016-3 Class B EETCs were used on the date of issuance of the 2016-3 Class B EETCs to acquire Series B equipment notes issued by American in connection with the financing of the 2016-3 Aircraft. Interest and principal payments on equipment notes issued in connection with the 2016-3 EETCs are payable semi-annually in April and October of each year, with interest payments that began in April 2017 and principal payments that began in October 2017 for the Class AA and Class A EETCs and interest and principal payments beginning in April 2018 for the Class B EETCs. These equipment notes are secured by liens on the 2016-3 Aircraft. Certain information regarding the 2016-3 EETC equipment notes, as of December 31, 2017 , is set forth in the table below. 2016-3 EETCs Series AA Series A Series B Aggregate principal issued $558 million $256 million $193 million Fixed interest rate per annum 3.00% 3.25% 3.75% Maturity date October 2028 October 2028 October 2025 2017-1 EETCs In January 2017, American created three pass-through trusts which issued approximately $983 million aggregate principal amount of Series 2017-1 Class AA, Class A and Class B EETCs (the 2017-1 EETCs) in connection with the financing of 24 aircraft delivered to American through May 2017 (the 2017-1 Aircraft). During the first six months of 2017, all of the net proceeds received from the sale of the 2017-1 EETCs were used to purchase equipment notes issued by American in connection with the financing of the 2017-1 Aircraft. Interest and principal payments on equipment notes issued in connection with the 2017-1 EETCs are payable semi-annually in February and August of each year, with interest payments that began in August 2017 and principal payments beginning in February 2018. These equipment notes are secured by liens on the 2017-1 Aircraft. Certain information regarding the 2017-1 EETC equipment notes, as of December 31, 2017 , is set forth in the table below. 2017-1 EETCs Series AA Series A Series B Aggregate principal issued $537 million $248 million $198 million Fixed interest rate per annum 3.65% 4.00% 4.95% Maturity date February 2029 February 2029 February 2025 2017-2 EETCs In August 2017, American created two pass-through trusts which issued approximately $797 million aggregate principal amount of Series 2017-2 Class AA and Class A EETCs (the 2017-2 EETCs) in connection with the financing of 30 aircraft previously delivered to American or scheduled to be delivered to American through April 2018 (the 2017-2 Aircraft). A portion of the net proceeds received from the sale of the 2017-2 EETCs has been used to acquire Series AA and A equipment notes issued by American to the pass-through trusts and the balance of such proceeds is being held in escrow for the benefit of the holders of the 2017-2 EETCs until such time as American issues additional Series AA and A equipment notes to the pass-through trusts, which trusts will purchase such additional equipment notes with the escrowed funds. These escrowed funds are not guaranteed by American and are not reported as debt on American’s consolidated balance sheet because the proceeds held by the depository are not American’s assets. In October 2017, American created one additional pass-through trust which issued approximately $221 million aggregate principal amount of Series 2017-2 Class B EETCs (the 2017-2 Class B EETCs) in connection with the financing of the 2017-2 Aircraft. A portion of the net proceeds received from the sale of the Series 2017-2 Class B EETCs was used on the date of issuance of the 2017-2 Class B EETCs to acquire Series B equipment notes issued by American in connection with the financing of certain 2017-2 Aircraft, and the balance of such proceeds is being held in escrow for the benefit of the holders of the 2017-2 Class B EETCs until such time as American issues additional Series B equipment notes to the pass-through trust, which will purchase such additional equipment notes with a portion of the escrowed funds. These escrowed funds are not guaranteed by American and are not reported as debt on American’s consolidated balance sheet because the proceeds held by the depository are not American’s assets. As of December 31, 2017 , approximately $735 million of the escrowed proceeds from the 2017-2 EETCs have been used to purchase equipment notes issued by American. Interest and principal payments on equipment notes issued in connection with the 2017-2 EETCs are payable semi-annually in April and October of each year, with interest payments beginning in April 2018 and principal payments beginning in October 2018. These equipment notes are secured by liens on the aircraft financed with the proceeds of the 2017-2 EETCs. Certain information regarding the 2017-2 EETC equipment notes and the remaining escrowed proceeds of the 2017-2 EETCs, as of December 31, 2017 , is set forth in the table below. 2017-2 EETCs Series AA Series A Series B Aggregate principal issued $545 million $252 million $221 million Remaining escrowed proceeds $152 million $70 million $61 million Fixed interest rate per annum 3.35% 3.60% 3.70% Maturity date October 2029 October 2029 October 2025 (c) Equipment Loans and Other Notes Payable Issued in 2017 In 2017 , American entered into agreements under which it borrowed $1.0 billion in connection with the financing of certain aircraft. Debt incurred under these agreements matures in 2027 through 2029 and bears interest at fixed and variable rates of LIBOR plus an applicable margin averaging 3.08% at December 31, 2017 . Guarantees As of December 31, 2017 , American had issued guarantees covering AAG’s $500 million aggregate principal amount of 6.125% senior notes due 2018 , $750 million aggregate principal amount of 5.50% senior notes due 2019 and $500 million aggregate principal amount of 4.625% senior notes due 2020 . Collateral-Related Covenants Certain of American’s debt financing agreements contain loan to value (LTV) ratio covenants and require American to annually appraise the related collateral. Pursuant to such agreements, if the LTV ratio exceeds a specified threshold, American is required, as applicable, to pledge additional qualifying collateral (which in some cases may include cash collateral), or pay down such financing, in whole or in part. Specifically, American is required to meet certain collateral coverage tests on an annual basis for four credit facilities, as described below: 2013 Credit Facilities 2014 Credit Facilities April 2016 Credit Facilities December 2016 Credit Facilities Frequency of Appraisals of Appraised Collateral Annual Annual Annual Annual LTV Requirement 1.6x Collateral valuation to amount of debt outstanding (62.5% LTV) 1.6x Collateral valuation to amount of debt outstanding (62.5% LTV) 1.6x Collateral valuation to amount of debt outstanding (62.5% LTV) 1.6x Collateral valuation to amount of debt outstanding (62.5% LTV) LTV as of Last Measurement Date 33.9% 23.1% 42.7% 59.0% Collateral Description Generally, certain slots, route authorities, and airport gate leasehold rights used by American to operate all services between the U.S. and South America Generally, certain slots, route authorities and airport gate leasehold rights used by American to operate certain services between the U.S. and London Heathrow Generally, certain spare parts Generally, certain Ronald Reagan Washington National Airport (DCA) slots, certain La Guardia Airport (LGA) slots, certain simulators and certain leasehold rights At December 31, 2017 , American was in compliance with the applicable collateral coverage tests as of the most recent measurement dates.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Taxes [Line Items]
Income Taxes	Income Taxes The significant components of the income tax provision (benefit) were (in millions): Year Ended December 31, 2017 2016 2015 Current income tax provision: Federal $ — $ — $ — State and Local 24 12 20 Current income tax provision 24 12 20 Deferred income tax provision (benefit): Federal 1,085 1,508 (2,884 ) State and Local 56 103 (130 ) Deferred income tax provision (benefit) 1,141 1,611 (3,014 ) Total income tax provision (benefit) $ 1,165 $ 1,623 $ (2,994 ) The income tax provision (benefit) differed from amounts computed at the statutory federal income tax rate as follows (in millions): Year Ended December 31, 2017 2016 2015 Statutory income tax provision $ 1,079 $ 1,505 $ 1,616 State income tax provision, net of federal tax effect 61 63 72 Book expenses not deductible for tax purposes 33 34 57 Bankruptcy administration expenses 1 1 3 2017 Tax Act (7 ) — — Change in valuation allowance (3 ) 7 (4,742 ) Other, net 1 13 — Income tax provision (benefit) $ 1,165 $ 1,623 $ (2,994 ) We provide a valuation allowance for our deferred tax assets, which include our net operating losses (NOLs), when it is more likely than not that some portion, or all of our deferred tax assets, will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income. We consider all available positive and negative evidence and make certain assumptions in evaluating the realizability of our deferred tax assets. Many factors are considered that impact our assessment of future profitability, including conditions which are beyond our control, such as the health of the economy, the level and volatility of fuel prices and travel demand. In connection with the preparation of our financial statements at the end of 2015, we determined that after considering all positive and negative evidence, including the completion of certain critical Merger integration milestones as well as our financial performance, it was more likely than not that substantially all of our deferred income tax assets, which include our NOLs, would be realized. Accordingly, during the year ended December 31, 2015, we reversed $3.0 billion of the valuation allowance, which resulted in a special non-cash tax benefit recorded in the consolidated statement of operations. In addition to the changes in the valuation allowance from operations described above, the valuation allowance was also impacted by the changes in the components of accumulated other comprehensive income (loss), described in Note 10. The total increase to the valuation allowance was $7 million in 2017, $10 million of which is included in the 2017 Tax Act amount in the table above. In 2016, the total increase to the valuation allowance was $7 million and in 2015 , the total decrease to the valuation allowance was $4.8 billion . The components of our deferred tax assets and liabilities were (in millions): December 31, 2017 2016 Deferred tax assets: Operating loss carryforwards $ 2,281 $ 3,853 Pensions 1,559 2,610 Loyalty program liability 420 485 Alternative minimum tax (AMT) credit carryforwards 344 344 Postretirement benefits other than pensions 170 291 Rent expense 160 256 Gains from lease transactions 107 213 Reorganization items 35 53 Other 678 972 Total deferred tax assets 5,754 9,077 Valuation allowance (36 ) (29 ) Net deferred tax assets 5,718 9,048 Deferred tax liabilities: Accelerated depreciation and amortization (5,045 ) (7,216 ) Other (279 ) (345 ) Total deferred tax liabilities (5,324 ) (7,561 ) Net deferred tax asset $ 394 $ 1,487 At December 31, 2017 , we had approximately $10.0 billion of federal NOLs carried over from prior taxable years (NOL Carryforwards) to reduce future federal taxable income, substantially all of which we expect to be available for use in 2018. The federal NOL Carryforwards will expire beginning in 2022 if unused. We also had approximately $3.4 billion of NOL Carryforwards to reduce future state taxable income at December 31, 2017 , which will expire in years 2018 through 2037 if unused. Our ability to deduct our NOL Carryforwards and to utilize certain other available tax attributes can be substantially constrained under the general annual limitation rules of Section 382 where an “ownership change” has occurred. Substantially all of our remaining federal NOL Carryforwards attributable to US Airways Group are subject to limitation under Section 382; however, our ability to utilize such NOL Carryforwards is not anticipated to be effectively constrained as a result of such limitation. We elected to be covered by certain special rules for federal income tax purposes that permitted approximately $9.0 billion (with $8.4 billion of unlimited NOL still remaining at December 31, 2017 ) of our federal NOL Carryforwards to be utilized without regard to the annual limitation generally imposed by Section 382. Similar limitations may apply for state income tax purposes. Our ability to utilize any new NOL Carryforwards arising after the ownership changes is not affected by the annual limitation rules imposed by Section 382 unless another future ownership change occurs. Under the Section 382 limitation, cumulative stock ownership changes among material stockholders exceeding 50% during a rolling three-year period can potentially limit a company’s future use of NOLs and tax credits. See Part I, Item 1A. Risk Factors – “Our ability to utilize our NOL Carryforwards may be limited” for unaudited additional discussion of this risk. At December 31, 2017 , we had an AMT credit carryforward of approximately $339 million available for federal income tax purposes, which is now expected to be refunded in 2019 and 2020 as a result of the repeal of corporate AMT. In 2017 , we recorded an income tax provision of $1.2 billion , with an effective rate of approximately 38% , which was substantially non-cash as we utilized our NOLs described above. Substantially all of our income before income taxes is attributable to the United States. We file our tax returns as prescribed by the tax laws of the jurisdictions in which we operate. Our 2014 through 2016 tax years are still subject to examination by the Internal Revenue Service. Various state and foreign jurisdiction tax years remain open to examination and we are under examination, in administrative appeals, or engaged in tax litigation in certain jurisdictions. We believe that the effect of any assessments will not be material to our consolidated financial statements. The amount of, and changes to, our uncertain tax positions were not material in any of the years presented. We accrue interest and penalties related to unrecognized tax benefits in interest expense and operating expense, respectively. The 2017 Tax Act was enacted on December 22, 2017. The 2017 Tax Act is the most comprehensive tax change in more than 30 years. As of December 31, 2017, we have not completed our evaluation of the 2017 Tax Act; however, to the extent possible, we have made a reasonable estimate of its effects, including the impact of lower corporate income tax rates (21% vs. 35%) on our deferred tax assets and liabilities and the one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred. For the year ended December 31, 2017, we recognized a special income tax benefit of $7 million to reflect these impacts of the 2017 Tax Act. The 2017 Tax Act is unclear in many respects and could be subject to potential amendments and technical corrections, as well as interpretations and implementation regulations by the Treasury and Internal Revenue Service. In addition, it is unclear how these U.S. federal income tax changes will affect state and local taxation, which often uses federal taxable income as a starting point for computing state and local tax liabilities. Accordingly, we have not yet been able to make a reasonable estimate of the impact of certain items and continue to account for those items based on the tax laws in effect prior to the 2017 Tax Act. As further interpretations, clarifications and amendments to the 2017 Tax Act are made, our future financial statements could be materially impacted.
American Airlines, Inc. [Member]
Income Taxes [Line Items]
Income Taxes	Income Taxes The significant components of the income tax provision (benefit) were (in millions): Year Ended December 31, 2017 2016 2015 Current income tax provision: Federal $ — $ — $ — State and Local 24 10 15 Current income tax provision 24 10 15 Deferred income tax provision (benefit): Federal 1,235 1,559 (3,407 ) State and Local 63 93 (60 ) Deferred income tax provision (benefit) 1,298 1,652 (3,467 ) Total income tax provision (benefit) $ 1,322 $ 1,662 $ (3,452 ) The income tax provision (benefit) differed from amounts computed at the statutory federal income tax rate as follows (in millions): Year Ended December 31, 2017 2016 2015 Statutory income tax provision $ 1,135 $ 1,555 $ 1,635 State income tax provision, net of federal tax effect 54 67 71 Book expenses not deductible for tax purposes 30 32 55 Bankruptcy administration expenses 1 1 3 2017 Tax Act 93 — — Change in valuation allowance 4 (1 ) (5,216 ) Other, net 5 8 — Income tax provision (benefit) $ 1,322 $ 1,662 $ (3,452 ) American provides a valuation allowance for its deferred tax assets, which include the net operating losses (NOLs), when it is more likely than not that some portion, or all of its deferred tax assets, will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income. American considers all available positive and negative evidence and makes certain assumptions in evaluating the realizability of its deferred tax assets. Many factors are considered that impact American’s assessment of future profitability, including conditions which are beyond its control, such as the health of the economy, the level and volatility of fuel prices and travel demand. In connection with the preparation of American’s financial statements at the end of 2015, American determined that after considering all positive and negative evidence, including the completion of certain critical Merger integration milestones as well as its financial performance, it was more likely than not that substantially all of its deferred income tax assets, which include its NOLs, would be realized. Accordingly, during the year ended December 31, 2015, American reversed $3.5 billion of the valuation allowance, which resulted in a special non-cash tax benefit recorded in the consolidated statement of operations. In addition to the changes in the valuation allowance from operations described above, the valuation allowance was also impacted by the changes in the components of accumulated other comprehensive income (loss), described in Note 8. The total increase to the valuation allowance was $12 million in 2017, $8 million of which is included in the 2017 Tax Act amount in the table above. In 2016 and 2015, the decrease in the valuation allowance was $1 million and $5.2 billion , respectively. The components of American’s deferred tax assets and liabilities were (in millions): December 31, 2017 2016 Deferred tax assets: Operating loss carryforwards $ 2,409 $ 4,087 Pensions 1,549 2,595 Loyalty program liability 420 485 Alternative minimum tax (AMT) credit carryforwards 457 456 Postretirement benefits other than pensions 170 291 Rent expense 160 256 Gains from lease transactions 107 213 Reorganization items 35 53 Other 638 911 Total deferred tax assets 5,945 9,347 Valuation allowance (25 ) (13 ) Net deferred tax assets 5,920 9,334 Deferred tax liabilities: Accelerated depreciation and amortization (4,999 ) (7,101 ) Other (274 ) (335 ) Total deferred tax liabilities (5,273 ) (7,436 ) Net deferred tax asset $ 647 $ 1,898 At December 31, 2017 , American had approximately $10.6 billion of federal NOLs carried over from prior taxable years (NOL Carryforwards) to reduce future federal taxable income, substantially all of which American expects to be available for use in 2018. American is a member of AAG’s consolidated federal and certain state income tax returns. The amount of federal NOL Carryforwards available in those returns is $10.0 billion , substantially all of which is expected to be available for use in 2018. The federal NOL Carryforwards will expire beginning in 2022 if unused. American also had approximately $3.2 billion of NOL Carryforwards to reduce future state taxable income at December 31, 2017 , which will expire in years 2018 through 2037 if unused. American’s ability to deduct its NOL Carryforwards and to utilize certain other available tax attributes can be substantially constrained under the general annual limitation rules of Section 382 where an “ownership change” has occurred. Substantially all of American’s remaining federal NOL Carryforwards attributable to US Airways Group are subject to limitation under Section 382; however, American’s ability to utilize such NOL Carryforwards is not anticipated to be effectively constrained as a result of such limitation. American elected to be covered by certain special rules for federal income tax purposes that permitted approximately $9.5 billion (with $8.6 billion of unlimited NOL still remaining at December 31, 2017 ) of its federal NOL Carryforwards to be utilized without regard to the annual limitation generally imposed by Section 382. Similar limitations may apply for state income tax purposes. American’s ability to utilize any new NOL Carryforwards arising after the ownership changes is not affected by the annual limitation rules imposed by Section 382 unless another future ownership change occurs. Under the Section 382 limitation, cumulative stock ownership changes among material stockholders exceeding 50% during a rolling three-year period can potentially limit a company’s future use of NOLs and tax credits. See Part I, Item 1A. Risk Factors – “Our ability to utilize our NOL Carryforwards may be limited” for unaudited additional discussion of this risk. At December 31, 2017 , American had an AMT credit carryforward of approximately $452 million available for federal income tax purposes, which is now expected to be refunded in 2019 and 2020 as a result of the repeal of corporate AMT. In 2017 , American recorded an income tax provision of $1.3 billion , with an effective rate of approximately 41% , which was substantially non-cash as American utilized the NOLs described above. Substantially all of American’s income before income taxes is attributable to the United States. American is part of the AAG consolidated income tax return. American files its tax returns as prescribed by the tax laws of the jurisdictions in which it operates. American’s 2014 through 2016 tax years are still subject to examination by the Internal Revenue Service. Various state and foreign jurisdiction tax years remain open to examination and American is under examination, in administrative appeals, or engaged in tax litigation in certain jurisdictions. American believes that the effect of any assessments will not be material to its consolidated financial statements. The amount of, and changes to, American’s uncertain tax positions were not material in any of the years presented. American accrues interest and penalties related to unrecognized tax benefits in interest expense and operating expense, respectively. The 2017 Tax Act was enacted on December 22, 2017. The 2017 Tax Act is the most comprehensive tax change in more than 30 years. As of December 31, 2017, American has not completed its evaluation of the 2017 Tax Act; however, to the extent possible, American has made a reasonable estimate of its effects, including the impact of lower corporate income tax rates (21% vs. 35%) on its deferred tax assets and liabilities and the one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred. For the year ended December 31, 2017, American recognized a special income tax expense of $93 million to reflect these impacts of the 2017 Tax Act. The 2017 Tax Act is unclear in many respects and could be subject to potential amendments and technical corrections, as well as interpretations and implementation regulations by the Treasury and Internal Revenue Service. In addition, it is unclear how these U.S. federal income tax changes will affect state and local taxation, which often uses federal taxable income as a starting point for computing state and local tax liabilities. Accordingly, American has not yet been able to make a reasonable estimate of the impact of certain items and continues to account for those items based on the tax laws in effect prior to the 2017 Tax Act. As further interpretations, clarifications and amendments to the 2017 Tax Act are made, American’s future financial statements could be materially impacted.

Risk Management

Risk Management	12 Months Ended
	Dec. 31, 2017
Debt Instrument [Line Items]
Risk Management	Risk Management Our economic prospects are heavily dependent upon two variables we cannot control: the health of the economy and the price of fuel. Due to the discretionary nature of business and leisure travel spending and the highly competitive nature of the airline industry, our revenues are heavily influenced by the condition of the U.S. economy and economies in other regions of the world. Unfavorable conditions in these broader economies have resulted, and may result in the future, in decreased passenger demand for air travel, changes in booking practices and related reactions by our competitors, all of which in turn have had, and may have in the future, a negative effect on our business. In addition, during challenging economic times, actions by our competitors to increase their revenues can have an adverse impact on our revenues. Our operating results are materially impacted by changes in the availability, price volatility and cost of aircraft fuel, which represents one of the largest single cost items in our business. Jet fuel market prices have fluctuated substantially over the past several years and prices continue to be highly volatile. Because of the amount of fuel needed to operate our business, even a relatively small increase or decrease in the price of fuel can have a material effect on our operating results and liquidity. These additional factors could impact our results of operations, financial performance and liquidity: (a) Credit Risk Most of our receivables relate to tickets sold to individual passengers through the use of major credit cards or to tickets sold by other airlines and used by passengers on American. These receivables are short-term, mostly settled within seven days after sale. Bad debt losses, which have been minimal in the past, have been considered in establishing allowances for doubtful accounts. We do not believe we are subject to any significant concentration of credit risk. (b) Interest Rate Risk We have exposure to market risk associated with changes in interest rates related primarily to our variable rate debt obligations. Interest rates on $9.6 billion principal amount of long-term debt as of December 31, 2017 are subject to adjustment to reflect changes in floating interest rates. The weighted average effective interest rate on our variable rate debt was 3.4% at December 31, 2017 . We do not currently have an interest rate hedge program. (c) Foreign Currency Risk We are exposed to the effect of foreign exchange rate fluctuations on the U.S. dollar value of foreign currency-denominated operating revenues and expenses. Our largest exposure comes from the British pound, Euro, Canadian dollar and various Latin American currencies, primarily the Brazilian real. We do not currently have a foreign currency hedge program. See Part I, Item 1A. Risk Factors – “We operate a global business with international operations that are subject to economic and political instability and have been, and in the future may continue to be, adversely affected by numerous events, circumstances or government actions beyond our control” for unaudited additional discussion of this risk.
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Risk Management	Risk Management American’s economic prospects are heavily dependent upon two variables it cannot control: the health of the economy and the price of fuel. Due to the discretionary nature of business and leisure travel spending and the highly competitive nature of the airline industry, American’s revenues are heavily influenced by the condition of the U.S. economy and economies in other regions of the world. Unfavorable conditions in these broader economies have resulted, and may result in the future, in decreased passenger demand for air travel, changes in booking practices and related reactions by American’s competitors, all of which in turn have had, and may have in the future, a negative effect on American’s business. In addition, during challenging economic times, actions by its competitors to increase their revenues can have an adverse impact on American’s revenues. American’s operating results are materially impacted by changes in the availability, price volatility and cost of aircraft fuel, which represents one of the largest single cost items in American’s business. Jet fuel market prices have fluctuated substantially over the past several years and prices continue to be highly volatile. Because of the amount of fuel needed to operate American’s business, even a relatively small increase or decrease in the price of fuel can have a material effect on American’s operating results and liquidity. These additional factors could impact American’s results of operations, financial performance and liquidity: (a) Credit Risk Most of American’s receivables relate to tickets sold to individual passengers through the use of major credit cards or to tickets sold by other airlines and used by passengers on American. These receivables are short-term, mostly settled within seven days after sale. Bad debt losses, which have been minimal in the past, have been considered in establishing allowances for doubtful accounts. American does not believe it is subject to any significant concentration of credit risk. (b) Interest Rate Risk American has exposure to market risk associated with changes in interest rates related primarily to its variable rate debt obligations. Interest rates on $9.6 billion principal amount of long-term debt as of December 31, 2017 are subject to adjustment to reflect changes in floating interest rates. The weighted average effective interest rate on American’s variable rate debt was 3.4% at December 31, 2017 . American does not currently have an interest rate hedge program. (c) Foreign Currency Risk American is exposed to the effect of foreign exchange rate fluctuations on the U.S. dollar value of foreign currency-denominated operating revenues and expenses. American’s largest exposure comes from the British pound, Euro, Canadian dollar and various Latin American currencies, primarily the Brazilian real. American does not currently have a foreign currency hedge program. See Part I, Item 1A. Risk Factors – “We operate a global business with international operations that are subject to economic and political instability and have been, and in the future may continue to be, adversely affected by numerous events, circumstances or government actions beyond our control” for unaudited additional discussion of this risk.

Fair Value Measurements and Oth

Fair Value Measurements and Other Investments	12 Months Ended
	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements and Other Investments	Fair Value Measurements and Other Investments Assets Measured at Fair Value on a Recurring Basis Fair value is defined as the price that would be received from the sale of an asset or paid to transfer a liability (i.e. an exit price) on the measurement date in an orderly transaction between market participants in the principal or most advantageous market for the asset or liability. Accounting standards include disclosure requirements around fair values used for certain financial instruments and establish a fair value hierarchy. The hierarchy prioritizes valuation inputs into three levels based on the extent to which inputs used in measuring fair value are observable in the market. Each fair value measurement is reported in one of three levels: • Level 1 – Observable inputs such as quoted prices in active markets; • Level 2 – Inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and • Level 3 – Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions. When available, we use quoted market prices to determine the fair value of our financial assets. If quoted market prices are not available, we measure fair value using valuation techniques that use, when possible, current market-based or independently-sourced market parameters, such as interest rates and currency rates. We utilize the market approach to measure fair value for our financial assets. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets. Our short-term investments classified as Level 2 primarily utilize broker quotes in a non-active market for valuation of these securities. No changes in valuation techniques or inputs occurred during the year ended December 31, 2017 . Assets measured at fair value on a recurring basis are summarized below (in millions): Fair Value Measurements as of December 31, 2017 Total Level 1 Level 2 Level 3 Short-term investments (1) (2) : Money market funds $ 188 $ 188 $ — $ — Corporate obligations 1,620 — 1,620 — Bank notes/certificates of deposit/time deposits 2,663 — 2,663 — Repurchase agreements 300 — 300 — 4,771 188 4,583 — Restricted cash and short-term investments (1) 318 108 210 — Total $ 5,089 $ 296 $ 4,793 $ — (1) Unrealized gains or losses on short-term investments and restricted cash and short-term investments are recorded in accumulated other comprehensive income (loss) at each measurement date. (2) All short-term investments are classified as available-for-sale and stated at fair value. Our short-term investments mature in one year or less except for $700 million of bank notes/certificates of deposit/time deposits and $341 million of corporate obligations. Fair Value Measurements as of December 31, 2016 Total Level 1 Level 2 Level 3 Short-term investments (1) (2) : Money market funds $ 589 $ 589 $ — $ — Corporate obligations 2,550 — 2,550 — Bank notes/certificates of deposit/time deposits 2,898 — 2,898 — 6,037 589 5,448 — Restricted cash and short-term investments (1) 638 638 — — Total $ 6,675 $ 1,227 $ 5,448 $ — (1) Unrealized gains or losses on short-term investments and restricted cash and short-term investments are recorded in accumulated other comprehensive income (loss) at each measurement date. (2) All short-term investments are classified as available-for-sale and stated at fair value. Our short-term investments mature in one year or less except for $385 million of bank notes/certificates of deposit/time deposits and $230 million of corporate obligations. Fair Value of Debt The fair value of our long-term debt was estimated using quoted market prices or discounted cash flow analyses, based on our current estimated incremental borrowing rates for similar types of borrowing arrangements. If our long-term debt was measured at fair value, it would have been classified as Level 2 in the fair value hierarchy. The carrying value and estimated fair value of our long-term debt, including current maturities, were as follows (in millions): December 31, 2017 December 31, 2016 Carrying Value Fair Value Carrying Value Fair Value Long-term debt, including current maturities $ 25,065 $ 25,848 $ 24,344 $ 24,983 Other Investments We have an approximate 25% ownership interest in Republic Airways Holdings Inc. (Republic), which we received in the second quarter of 2017 in consideration for our unsecured claim in Republic’s bankruptcy case. This ownership interest is accounted for under the equity method and our portion of Republic’s financial results is recognized within other, net on the consolidated statements of operations. In 2017, we recognized $544 million of regional expense from our capacity purchase agreement with Republic. Additionally, in the third quarter of 2017, we acquired 2.7% of the outstanding shares of China Southern Airlines Company Limited for $203 million . Since our subscription agreement restricts the sale or transfer of these shares for three years, we account for this investment under the cost method. These investments are reflected within other assets on our consolidated balance sheets.
American Airlines, Inc. [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements and Other Investments	Fair Value Measurements and Other Investments Assets Measured at Fair Value on a Recurring Basis Fair value is defined as the price that would be received from the sale of an asset or paid to transfer a liability (i.e. an exit price) on the measurement date in an orderly transaction between market participants in the principal or most advantageous market for the asset or liability. Accounting standards include disclosure requirements around fair values used for certain financial instruments and establish a fair value hierarchy. The hierarchy prioritizes valuation inputs into three levels based on the extent to which inputs used in measuring fair value are observable in the market. Each fair value measurement is reported in one of three levels: • Level 1 – Observable inputs such as quoted prices in active markets; • Level 2 – Inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and • Level 3 – Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions. When available, American uses quoted market prices to determine the fair value of its financial assets. If quoted market prices are not available, American measures fair value using valuation techniques that use, when possible, current market-based or independently-sourced market parameters, such as interest rates and currency rates. American utilizes the market approach to measure fair value for its financial assets. The market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets. American’s short-term investments classified as Level 2 primarily utilize broker quotes in a non-active market for valuation of these securities. No changes in valuation techniques or inputs occurred during the year ended December 31, 2017 . Assets measured at fair value on a recurring basis are summarized below (in millions): Fair Value Measurements as of December 31, 2017 Total Level 1 Level 2 Level 3 Short-term investments (1) (2) : Money market funds $ 186 $ 186 $ — $ — Corporate obligations 1,620 — 1,620 — Bank notes/certificates of deposit/time deposits 2,662 — 2,662 — Repurchase agreements 300 — 300 — 4,768 186 4,582 — Restricted cash and short-term investments (1) 318 108 210 — Total $ 5,086 $ 294 $ 4,792 $ — (1) Unrealized gains or losses on short-term investments and restricted cash and short-term investments are recorded in accumulated other comprehensive income (loss) at each measurement date. (2) All short-term investments are classified as available-for-sale and stated at fair value. American’s short-term investments mature in one year or less except for $700 million of bank notes/certificates of deposit/time deposits and $341 million of corporate obligations. Fair Value Measurements as of December 31, 2016 Total Level 1 Level 2 Level 3 Short-term investments (1) (2) : Money market funds $ 587 $ 587 $ — $ — Corporate obligations 2,550 — 2,550 — Bank notes/certificates of deposit/time deposits 2,897 — 2,897 — 6,034 587 5,447 — Restricted cash and short-term investments (1) 638 638 — — Total $ 6,672 $ 1,225 $ 5,447 $ — (1) Unrealized gains or losses on short-term investments and restricted cash and short-term investments are recorded in accumulated other comprehensive income (loss) at each measurement date. (2) All short-term investments are classified as available-for-sale and stated at fair value. American’s short-term investments mature in one year or less except for $385 million of bank notes/certificates of deposit/time deposits and $230 million of corporate obligations. Fair Value of Debt The fair value of American’s long-term debt was estimated using quoted market prices or discounted cash flow analyses, based on American’s current estimated incremental borrowing rates for similar types of borrowing arrangements. If American’s long-term debt was measured at fair value, it would have been classified as Level 2 in the fair value hierarchy. The carrying value and estimated fair value of American’s long-term debt, including current maturities, were as follows (in millions): December 31, 2017 December 31, 2016 Carrying Value Fair Value Carrying Value Fair Value Long-term debt, including current maturities $ 23,294 $ 24,029 $ 22,577 $ 23,181 Other Investments American has an approximate 25% ownership interest in Republic Airways Holdings Inc. (Republic), which it received in the second quarter of 2017 in consideration for its unsecured claim in Republic’s bankruptcy case. This ownership interest is accounted for under the equity method and American’s portion of Republic’s financial results is recognized within other, net on the consolidated statements of operations. In 2017, American recognized $544 million of regional expense from its capacity purchase agreement with Republic. Additionally, in the third quarter of 2017, American acquired 2.7% of the outstanding shares of China Southern Airlines Company Limited for $203 million . Since American’s subscription agreement restricts the sale or transfer of these shares for three years, American accounts for this investment under the cost method. These investments are reflected within other assets on American’s consolidated balance sheets.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans	Employee Benefit Plans We sponsor defined benefit and defined contribution pension plans for eligible employees. The defined benefit pension plans provide benefits for participating employees based on years of service and average compensation for a specified period of time before retirement. Effective November 1, 2012, substantially all of our defined benefit pension plans were frozen and we began providing enhanced benefits under our defined contribution pension plans for certain employee groups. We use a December 31 measurement date for all of our defined benefit pension plans. We also provide certain retiree medical and other postretirement benefits, including health care and life insurance benefits, to retired employees. Effective November 1, 2012, we modified our retiree medical and other postretirement benefits plans to eliminate the company subsidy for employees who retire on or after November 1, 2012. As a result of modifications to our retiree medical and other postretirement benefits plans in 2012, we recognized a negative plan amendment of $1.9 billion , which is included as a component of prior service benefit in OCI and will be amortized over the future service life of the active plan participants for whom the benefit was eliminated, or approximately eight years . As of December 31, 2017 , $631 million of prior service benefit remains to be amortized. Benefit Obligations, Fair Value of Plan Assets and Funded Status The following tables provide a reconciliation of the changes in the pension and retiree medical and other postretirement benefits obligations, fair value of plan assets and a statement of funded status as of December 31, 2017 and 2016 : Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2017 2016 (In millions) Benefit obligation at beginning of period $ 17,238 $ 16,395 $ 991 $ 1,131 Service cost 2 2 4 3 Interest cost 721 749 39 47 Actuarial (gain) loss (1) (2) 1,016 729 49 (105 ) Plan amendments — — — 7 Settlements (4 ) (2 ) — — Benefit payments (726 ) (635 ) (80 ) (92 ) Other 28 — 8 — Benefit obligation at end of period $ 18,275 $ 17,238 $ 1,011 $ 991 Fair value of plan assets at beginning of period $ 10,017 $ 9,707 $ 266 $ 253 Actual return on plan assets 1,797 915 37 22 Employer contributions (3) 286 32 72 83 Settlements (4 ) (2 ) — — Benefit payments (726 ) (635 ) (80 ) (92 ) Other 25 — — — Fair value of plan assets at end of period $ 11,395 $ 10,017 $ 295 $ 266 Funded status at end of period $ (6,880 ) $ (7,221 ) $ (716 ) $ (725 ) (1) The December 31, 2017 and 2016 pension actuarial loss primarily relates to weighted average discount rate assumption changes and changes to our mortality assumptions. (2) The December 31, 2017 retiree medical and other postretirement benefits actuarial (gain) loss primarily relates to plan experience adjustments, weighted average discount rate assumption changes and changes to our mortality assumptions and as of December 31, 2016 , also includes medical trend and cost assumption changes. (3) During 2017 , we contributed $286 million to our defined benefit pension plans, including supplemental contributions of $261 million in addition to a $25 million minimum required cash contribution. Balance Sheet Position Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2017 2016 (In millions) As of December 31, Current liability $ 10 $ 7 $ 89 $ 97 Noncurrent liability 6,870 7,214 627 628 Total liabilities $ 6,880 $ 7,221 $ 716 $ 725 Net actuarial loss (gain) $ 5,351 $ 5,484 $ (388 ) $ (430 ) Prior service cost (benefit) 160 188 (600 ) (837 ) Total accumulated other comprehensive loss (income), pre-tax $ 5,511 $ 5,672 $ (988 ) $ (1,267 ) Plans with Accumulated Benefit Obligations Exceeding Fair Value of Plan Assets Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2017 2016 (In millions) Projected benefit obligation $ 18,245 $ 17,209 $ — $ — Accumulated benefit obligation (ABO) 18,235 17,197 — — Accumulated postretirement benefit obligation — — 1,011 990 Fair value of plan assets 11,364 9,986 295 266 ABO less fair value of plan assets 6,871 7,211 — — Net Periodic Benefit Cost (Income) Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2015 2017 2016 2015 (In millions) Defined benefit plans: Service cost $ 2 $ 2 $ 2 $ 4 $ 3 $ 3 Interest cost 721 749 737 39 47 50 Expected return on assets (790 ) (750 ) (851 ) (21 ) (20 ) (19 ) Settlements 1 — 1 — — — Amortization of: Prior service cost (benefit) 28 28 28 (237 ) (240 ) (243 ) Unrecognized net loss (gain) 144 126 112 (23 ) (17 ) (9 ) Net periodic benefit cost (income) 106 155 29 (238 ) (227 ) (218 ) Defined contribution plan cost 851 766 662 N/A N/A N/A Total cost (income) $ 957 $ 921 $ 691 $ (238 ) $ (227 ) $ (218 ) The estimated amount of unrecognized actuarial net loss and prior service cost for the defined benefit pension plans that will be amortized from accumulated other comprehensive income (loss) into net periodic benefit cost over the next fiscal year is $172 million . The estimated amount of unrecognized actuarial net gain and prior service benefit for the retiree medical and other postretirement benefits plans that will be amortized from accumulated other comprehensive income (loss) into net periodic benefit cost over the next fiscal year is $258 million . Assumptions The following actuarial assumptions were used to determine our benefit obligations and net periodic benefit cost for the periods presented: Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2017 2016 Benefit obligations: Weighted average discount rate 3.80% 4.30% 3.60% 4.10% Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2015 2017 2016 2015 Net periodic benefit cost: Weighted average discount rate 4.30% 4.70% 4.30% 4.10% 4.42% 4.00% Weighted average expected rate of return on plan assets 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% Weighted average health care cost trend rate assumed for next year (1) N/A N/A N/A 4.19% 4.25% 5.21% (1) The weighted average health care cost trend rate at December 31, 2017 is assumed to decline gradually to 3.76% by 2025 and remain level thereafter. As of December 31, 2017 , our estimate of the long-term rate of return on plan assets was 8% based on the target asset allocation. Expected returns on long duration bonds are based on yields to maturity of the bonds held at year-end. Expected returns on other assets are based on a combination of long-term historical returns, actual returns on plan assets achieved over the last ten years, current and expected market conditions, and expected value to be generated through active management, currency overlay and securities lending programs. A one percentage point change in the assumed health care cost trend rates would have the following effects on our retiree medical and other postretirement benefits plans (in millions): 1% Increase 1% Decrease Increase (decrease) on 2017 service and interest cost $ 2 $ (2 ) Increase (decrease) on benefit obligation as of December 31, 2017 54 (51 ) Minimum Contributions We are required to make minimum contributions to our defined benefit pension plans under the minimum funding requirements of the Employee Retirement Income Security Act of 1974 (ERISA) and various other laws for U.S. based plans as well as under funding rules specific to countries where we maintain defined benefit plans. Based on current funding assumptions, we have minimum required contributions of $42 million for 2018 including contributions to defined benefit plans for our wholly-owned regional subsidiaries. We expect to make supplemental contributions of $425 million to our U.S. based defined benefit pension plans in 2018. The minimum funding obligation for our U.S. based defined benefit pension plans was subject to temporary favorable rules that expired at the end of 2017. Our pension funding obligations are likely to increase materially beginning in 2019, when we will be required to make contributions relating to the 2018 fiscal year. The amount of these obligations will depend on the performance of our investments held in trust by the pension plans, interest rates for determining liabilities, the amount of and timing of any supplemental contributions and our actuarial experience. Benefit Payments The following benefit payments, which reflect expected future service as appropriate, are expected to be paid (approximately, in millions): 2018 2019 2020 2021 2022 2023-2027 Pension benefits $ 715 $ 754 $ 799 $ 843 $ 884 $ 4,976 Retiree medical and other postretirement benefits 96 92 80 75 70 315 Plan Assets The objectives of our investment policies are to: maintain sufficient income and liquidity to pay retirement benefits; produce a long-term rate of return that meets or exceeds the assumed rate of return for plan assets; limit the volatility of asset performance and funded status; and diversify assets among asset classes and investment managers. Based on these investment objectives, a long-term strategic asset allocation has been established. This strategic allocation seeks to balance the potential benefit of improving funded position with the potential risk that the funded position would decline. The current strategic target asset allocation is as follows: Asset Class/Sub-Class Allowed Range Equity 65% - 90% Public: U.S. Large 20% - 50% U.S. Small/Mid 0% - 10% International 17% - 27% Emerging Markets 5% - 11% Alternative Investments 5% - 20% Fixed Income 15% - 40% Public: U.S. Long Duration 15% - 30% High Yield and Emerging Markets 0% - 10% Private Income 0% - 10% Other 0% - 5% Cash Equivalents 0% - 5% Public equity and emerging market fixed income securities are used to provide diversification and are expected to generate higher returns over the long-term than U.S. long duration bonds. Public stocks are managed using a value investment approach in order to participate in the returns generated by stocks in the long-term, while reducing year-over-year volatility. U.S. long duration bonds are used to partially hedge the assets from declines in interest rates. Alternative (private) investments are used to provide expected returns in excess of the public markets over the long-term. Additionally, the pension plan’s master trust engages currency overlay managers in an attempt to increase returns by protecting non-U.S. dollar denominated assets from a rise in the relative value of the U.S. dollar. The pension plan’s master trust also participates in securities lending programs to generate additional income by loaning plan assets to borrowers on a fully collateralized basis. These programs are subject to market risk. Investments in securities traded on recognized securities exchanges are valued at the last reported sales price on the last business day of the year. Securities traded in the over-the-counter market are valued at the last bid price. The money market fund is valued at fair value which represents the net asset value of the shares of such fund as of the close of business at the end of the period. Investments in limited partnerships are carried at estimated net asset value as determined by and reported by the general partners of the partnerships and represent the proportionate share of the estimated fair value of the underlying assets of the limited partnerships. Common/collective trusts are valued at net asset value based on the fair values of the underlying investments of the trusts as determined by the sponsor of the trusts. The pension plan’s master trust also invests in a 103-12 investment entity (the 103-12 Investment Trust) which is designed to invest plan assets of more than one unrelated employer. The 103-12 Investment Trust is valued at net asset value which is determined by the issuer at the end of each month and is based on the aggregate fair value of trust assets less liabilities, divided by the number of units outstanding. No changes in valuation techniques or inputs occurred during the year. Benefit Plan Assets Measured at Fair Value on a Recurring Basis The fair value of our pension plan assets at December 31, 2017 and 2016 , by asset category, are as follows (in millions): Fair Value Measurements as of December 31, 2017 Asset Category Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Cash and cash equivalents $ 28 $ — $ — $ 28 Equity securities: International markets (a) (b) 3,837 — — 3,837 Large-cap companies (b) 2,451 — — 2,451 Mid-cap companies (b) 744 — — 744 Small-cap companies (b) 125 — — 125 Mutual funds (c) 55 — — 55 Fixed income: Corporate bonds (d) — 2,344 — 2,344 Government securities (e) — 238 — 238 U.S. municipal securities — 39 — 39 Alternative instruments: Private equity partnerships (f) — — 14 14 Private equity partnerships measured at net asset value (f) (h) — — — 879 Common/collective trusts (g) — 315 — 315 Common/collective trusts and 103-12 Investment Trust measured at net asset value (g) (h) — — — 283 Insurance group annuity contracts — — 2 2 Dividend and interest receivable 44 — — 44 Due to/from brokers for sale of securities – net 3 — — 3 Other liabilities – net (6 ) — — (6 ) Total $ 7,281 $ 2,936 $ 16 $ 11,395 a) Holdings are diversified as follows: 17% United Kingdom, 11% Japan, 9% France, 6% Switzerland, 16% emerging markets and the remaining 41% with no concentration greater than 5% in any one country. b) There are no significant concentrations of holdings by company or industry. c) Investment includes mutual funds invested 39% in equity securities of large-cap, mid-cap and small-cap U.S. companies, 34% in U.S. treasuries and corporate bonds and 27% in equity securities of international companies. d) Includes approximately 76% investments in corporate debt with a S&P rating lower than A and 24% investments in corporate debt with a S&P rating A or higher. Holdings include 85% U.S. companies, 12% international companies and 3% emerging market companies. e) Includes approximately 27% investments in U.S. domestic government securities, 43% in emerging market government securities and 30% in international government securities. There are no significant foreign currency risks within this classification. f) Includes limited partnerships that invest primarily in U.S. ( 94% ) and European ( 6% ) buyout opportunities of a range of privately held companies. The pension plan’s master trust does not have the right to redeem its limited partnership investment at its net asset value, but rather receives distributions as the underlying assets are liquidated. It is estimated that the underlying assets of these funds will be gradually liquidated over the next one to ten years . Additionally, the pension plan’s master trust has future funding commitments of approximately $903 million over the next ten years. g) Investment includes 42% in a collective interest trust investing primarily in short-term securities, 40% in an emerging market 103-12 Investment Trust with investments in emerging country equity securities, 10% in Canadian segregated balanced value, income growth and diversified pooled funds and 8% in a common/collective trust investing in securities of smaller companies located outside the U.S., including developing markets. For some trusts, requests for withdrawals must meet specific requirements with advance notice of redemption preferred. h) Certain investments that are measured using net asset value per share (or its equivalent) as a practical expedient for fair value have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the notes to the consolidated financial statements. Fair Value Measurements as of December 31, 2016 Asset Category Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Cash and cash equivalents $ 573 $ — $ — $ 573 Equity securities: International markets (a) (b) 3,232 — — 3,232 Large-cap companies (b) 2,253 — — 2,253 Mid-cap companies (b) 371 — — 371 Small-cap companies (b) 6 — — 6 Mutual funds (c) 49 — — 49 Fixed income: Corporate bonds (d) — 2,337 — 2,337 Government securities (e) — 150 — 150 U.S. municipal securities — 37 — 37 Alternative instruments: Private equity partnerships (f) — — 21 21 Private equity partnerships measured at net asset value (f) (h) — — — 703 Common/collective trusts (g) — 32 — 32 Common/collective trusts and 103-12 Investment Trust measured at net asset value (g) (h) — — — 227 Insurance group annuity contracts — — 2 2 Dividend and interest receivable 40 — — 40 Due to/from brokers for sale of securities – net (9 ) — — (9 ) Other liabilities – net (7 ) — — (7 ) Total $ 6,508 $ 2,556 $ 23 $ 10,017 a) Holdings are diversified as follows: 15% United Kingdom, 12% Japan, 10% France, 7% Switzerland, 6% Netherlands, 17% other emerging markets and the remaining 33% with no concentration greater than 5% in any one country. b) There are no significant concentrations of holdings by company or industry. c) Investment includes mutual funds invested 42% in equity securities of large-cap, mid-cap and small-cap U.S. companies, 33% in U.S. treasuries and corporate bonds and 25% in equity securities of international companies. d) Includes approximately 74% investments in corporate debt with a S&P rating lower than A and 26% investments in corporate debt with a S&P rating A or higher. Holdings include 86% U.S. companies, 12% international companies and 2% emerging market companies. e) Includes approximately 61% investments in U.S. domestic government securities and 39% in emerging market government securities. There are no significant foreign currency risks within this classification. f) Includes limited partnerships that invest primarily in U.S. ( 95% ) and European ( 5% ) buyout opportunities of a range of privately held companies. The pension plan’s master trust does not have the right to redeem its limited partnership investment at its net asset value, but rather receives distributions as the underlying assets are liquidated. It is estimated that the underlying assets of these funds will be gradually liquidated over the next one to ten years . Additionally, the pension plan’s master trust has future funding commitments of approximately $456 million over the next ten years . g) Investment includes 73% in an emerging market 103-12 Investment Trust with investments in emerging country equity securities, 12% in Canadian segregated balanced value, income growth and diversified pooled funds and 15% in a common/collective trust investing in securities of smaller companies located outside the U.S., including developing markets. Requests for withdrawals must meet specific requirements with advance notice of redemption preferred. h) Certain investments that are measured using net asset value per share (or its equivalent) as a practical expedient for fair value have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the notes to the consolidated financial statements. Changes in fair value measurements of Level 3 investments during the year ended December 31, 2017 , were as follows (in millions): Private Equity Partnerships Insurance Group Annuity Contracts Beginning balance at December 31, 2016 $ 21 $ 2 Actual loss on plan assets: Relating to assets still held at the reporting date (4 ) — Purchases 1 — Sales (1 ) — Transfers out (3 ) — Ending balance at December 31, 2017 $ 14 $ 2 Changes in fair value measurements of Level 3 investments during the year ended December 31, 2016 , were as follows (in millions): Private Equity Partnerships Insurance Group Annuity Contracts Beginning balance at December 31, 2015 $ 16 $ 2 Actual return on plan assets: Relating to assets sold during the period 7 — Purchases 7 — Sales (9 ) — Ending balance at December 31, 2016 $ 21 $ 2 The fair value of our retiree medical and other postretirement benefits plans assets at December 31, 2017 by asset category, were as follows (in millions): Fair Value Measurements as of December 31, 2017 Asset Category Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Money market fund $ 5 $ — $ — $ 5 Mutual funds – AAL Class — 290 — 290 Total $ 5 $ 290 $ — $ 295 The fair value of our retiree medical and other postretirement benefits plans assets at December 31, 2016 by asset category, were as follows (in millions): Fair Value Measurements as of December 31, 2016 Asset Category Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Money market fund $ 5 $ — $ — $ 5 Mutual funds – Institutional Class 261 — — 261 Total $ 266 $ — $ — $ 266 Investments in the retiree medical and other postretirement benefits plans’ mutual funds are valued by quoted prices on the active market, which is fair value and represents the net asset value of the shares of such funds as of the close of business at the end of the period. At December 31, 2017, these funds were invested in an AAL Class mutual fund, in which trading is restricted only to American, resulting in a fair value classification of Level 2. At December 31, 2016, these investments were part of an Institutional Class of mutual funds and were actively traded on the open market resulting in a fair value classification of Level 1. Investments include approximately 30% and 27% of investments in non-U.S. common stocks in 2017 and 2016 , respectively. Net asset value is based on the fair market value of the funds’ underlying assets and liabilities at the date of determination. Profit Sharing Program We accrue 5% of our pre-tax income excluding special items for our profit sharing program. For the year ended December 31, 2017 , we accrued $241 million for this program, which will be distributed to employees in the first quarter of 2018.
American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee Benefit Plans	Employee Benefit Plans American sponsors defined benefit and defined contribution pension plans for eligible employees. The defined benefit pension plans provide benefits for participating employees based on years of service and average compensation for a specified period of time before retirement. Effective November 1, 2012, substantially all of American’s defined benefit pension plans were frozen and American began providing enhanced benefits under its defined contribution pension plans for certain employee groups. American uses a December 31 measurement date for all of its defined benefit pension plans. American also provides certain retiree medical and other postretirement benefits, including health care and life insurance benefits, to retired employees. Effective November 1, 2012, American modified its retiree medical and other postretirement benefits plans to eliminate the company subsidy for employees who retire on or after November 1, 2012. As a result of modifications to its retiree medical and other postretirement benefits plans in 2012, American recognized a negative plan amendment of $1.9 billion , which is included as a component of prior service benefit in OCI and will be amortized over the future service life of the active plan participants for whom the benefit was eliminated, or approximately eight years . As of December 31, 2017 , $631 million of prior service benefit remains to be amortized. Benefit Obligations, Fair Value of Plan Assets and Funded Status The following tables provide a reconciliation of the changes in the pension and retiree medical and other postretirement benefits obligations, fair value of plan assets and a statement of funded status as of December 31, 2017 and 2016 : Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2017 2016 (In millions) Benefit obligation at beginning of period $ 17,148 $ 16,310 $ 990 $ 1,129 Service cost 2 2 4 3 Interest cost 717 746 39 47 Actuarial (gain) loss (1) (2) 1,007 725 49 (104 ) Plan amendments — — — 7 Settlements (4 ) (2 ) — — Benefit payments (723 ) (633 ) (80 ) (92 ) Other 28 — 8 — Benefit obligation at end of period $ 18,175 $ 17,148 $ 1,010 $ 990 Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2017 2016 (In millions) Fair value of plan assets at beginning of period $ 9,968 $ 9,660 $ 266 $ 253 Actual return on plan assets 1,788 911 37 22 Employer contributions (3) 286 32 72 83 Settlements (4 ) (2 ) — — Benefit payments (723 ) (633 ) (80 ) (92 ) Other 25 — — — Fair value of plan assets at end of period $ 11,340 $ 9,968 $ 295 $ 266 Funded status at end of period $ (6,835 ) $ (7,180 ) $ (715 ) $ (724 ) (1) The December 31, 2017 and 2016 pension actuarial loss primarily relates to weighted average discount rate assumption changes and changes to American’s mortality assumptions. (2) The December 31, 2017 retiree medical and other postretirement benefits actuarial (gain) loss primarily relates to plan experience adjustments, weighted average discount rate assumption changes and changes to American’s mortality assumptions and as of December 31, 2016 , also includes medical trend and cost assumption changes. (3) During 2017, American contributed $286 million to its defined benefit pension plans, including supplemental contributions of $261 million in addition to a $25 million minimum required cash contribution. Balance Sheet Position Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2017 2016 (In millions) As of December 31, Current liability $ 10 $ 7 $ 88 $ 97 Noncurrent liability 6,825 7,173 627 627 Total liabilities $ 6,835 $ 7,180 $ 715 $ 724 Net actuarial loss (gain) $ 5,337 $ 5,472 $ (388 ) $ (429 ) Prior service cost (benefit) 159 188 (600 ) (837 ) Total accumulated other comprehensive loss (income), pre-tax $ 5,496 $ 5,660 $ (988 ) $ (1,266 ) Plans with Accumulated Benefit Obligations Exceeding Fair Value of Plan Assets Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2017 2016 (In millions) Projected benefit obligation $ 18,144 $ 17,119 $ — $ — Accumulated benefit obligation (ABO) 18,135 17,108 — — Accumulated postretirement benefit obligation — — 1,010 990 Fair value of plan assets 11,307 9,936 295 266 ABO less fair value of plan assets 6,828 7,172 — — Net Periodic Benefit Cost (Income) Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2015 2017 2016 2015 (In millions) Defined benefit plans: Service cost $ 2 $ 2 $ 1 $ 4 $ 3 $ 3 Interest cost 717 746 733 39 47 50 Expected return on assets (786 ) (747 ) (848 ) (21 ) (20 ) (19 ) Settlements 1 — 1 — — — Amortization of: Prior service cost (benefit) 28 28 28 (237 ) (240 ) (243 ) Unrecognized net loss (gain) 144 125 111 (23 ) (16 ) (9 ) Net periodic benefit cost (income) 106 154 26 (238 ) (226 ) (218 ) Defined contribution plan cost 844 761 657 N/A N/A N/A Total cost (income) $ 950 $ 915 $ 683 $ (238 ) $ (226 ) $ (218 ) The estimated amount of unrecognized actuarial net loss and prior service cost for the defined benefit pension plans that will be amortized from accumulated other comprehensive income (loss) into net periodic benefit cost over the next fiscal year is $171 million . The estimated amount of unrecognized actuarial net gain and prior service benefit for the retiree medical and other postretirement benefits plans that will be amortized from accumulated other comprehensive income (loss) into net periodic benefit cost over the next fiscal year is $258 million . Assumptions The following actuarial assumptions were used to determine American’s benefit obligations and net periodic benefit cost for the periods presented: Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2017 2016 Benefit obligations: Weighted average discount rate 3.80% 4.30% 3.60% 4.10% Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2015 2017 2016 2015 Net periodic benefit cost: Weighted average discount rate 4.30% 4.70% 4.30% 4.10% 4.42% 4.00% Weighted average expected rate of return on plan assets 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% Weighted average health care cost trend rate assumed for next year (1) N/A N/A N/A 4.19% 4.25% 5.21% (1) The weighted average health care cost trend rate at December 31, 2017 is assumed to decline gradually to 3.76% by 2025 and remain level thereafter. As of December 31, 2017 , American’s estimate of the long-term rate of return on plan assets was 8% based on the target asset allocation. Expected returns on long duration bonds are based on yields to maturity of the bonds held at year-end. Expected returns on other assets are based on a combination of long-term historical returns, actual returns on plan assets achieved over the last ten years, current and expected market conditions, and expected value to be generated through active management, currency overlay and securities lending programs. A one percentage point change in the assumed health care cost trend rates would have the following effects on American’s retiree medical and other postretirement benefits plans (in millions): 1% Increase 1% Decrease Increase (decrease) on 2017 service and interest cost $ 2 $ (2 ) Increase (decrease) on benefit obligation as of December 31, 2017 54 (51 ) Minimum Contributions American is required to make minimum contributions to its defined benefit pension plans under the minimum funding requirements of the Employee Retirement Income Security Act of 1974 (ERISA) and various other laws for U.S. based plans as well as under funding rules specific to countries where American maintains defined benefit plans. Based on current funding assumptions, American has minimum required contributions of $39 million for 2018 . American expects to make supplemental contributions of $425 million to its U.S. based defined benefit pension plans in 2018. The minimum funding obligation for American’s U.S. based defined benefit pension plans was subject to temporary favorable rules that expired at the end of 2017. American’s pension funding obligations are likely to increase materially beginning in 2019, when American will be required to make contributions relating to the 2018 fiscal year. The amount of these obligations will depend on the performance of American’s investments held in trust by the pension plans, interest rates for determining liabilities, the amount of and timing of any supplemental contributions and American’s actuarial experience. Benefit Payments The following benefit payments, which reflect expected future service as appropriate, are expected to be paid (approximately, in millions): 2018 2019 2020 2021 2022 2023-2027 Pension benefits $ 712 $ 750 $ 795 $ 839 $ 879 $ 4,951 Retiree medical and other postretirement benefits 96 92 80 75 70 314 Plan Assets The objectives of American’s investment policies are to: maintain sufficient income and liquidity to pay retirement benefits; produce a long-term rate of return that meets or exceeds the assumed rate of return for plan assets; limit the volatility of asset performance and funded status; and diversify assets among asset classes and investment managers. Based on these investment objectives, a long-term strategic asset allocation has been established. This strategic allocation seeks to balance the potential benefit of improving funded position with the potential risk that the funded position would decline. The current strategic target asset allocation is as follows: Asset Class/Sub-Class Allowed Range Equity 65% - 90% Public: U.S. Large 20% - 50% U.S. Small/Mid 0% - 10% International 17% - 27% Emerging Markets 5% - 11% Alternative Investments 5% - 20% Fixed Income 15% - 40% Public: U.S. Long Duration 15% - 30% High Yield and Emerging Markets 0% - 10% Private Income 0% - 10% Other 0% - 5% Cash Equivalents 0% - 5% Public equity and emerging market fixed income securities are used to provide diversification and are expected to generate higher returns over the long-term than U.S. long duration bonds. Public stocks are managed using a value investment approach in order to participate in the returns generated by stocks in the long-term, while reducing year-over-year volatility. U.S. long duration bonds are used to partially hedge the assets from declines in interest rates. Alternative (private) investments are used to provide expected returns in excess of the public markets over the long-term. Additionally, the pension plan’s master trust engages currency overlay managers in an attempt to increase returns by protecting non-U.S. dollar denominated assets from a rise in the relative value of the U.S. dollar. The pension plan’s master trust also participates in securities lending programs to generate additional income by loaning plan assets to borrowers on a fully collateralized basis. These programs are subject to market risk. Investments in securities traded on recognized securities exchanges are valued at the last reported sales price on the last business day of the year. Securities traded in the over-the-counter market are valued at the last bid price. The money market fund is valued at fair value which represents the net asset value of the shares of such fund as of the close of business at the end of the period. Investments in limited partnerships are carried at estimated net asset value as determined by and reported by the general partners of the partnerships and represent the proportionate share of the estimated fair value of the underlying assets of the limited partnerships. Common/collective trusts are valued at net asset value based on the fair values of the underlying investments of the trusts as determined by the sponsor of the trusts. The pension plan’s master trust also invests in a 103-12 investment entity (the 103-12 Investment Trust) which is designed to invest plan assets of more than one unrelated employer. The 103-12 Investment Trust is valued at net asset value which is determined by the issuer at the end of each month and is based on the aggregate fair value of trust assets less liabilities, divided by the number of units outstanding. No changes in valuation techniques or inputs occurred during the year. Benefit Plan Assets Measured at Fair Value on a Recurring Basis The fair value of American’s pension plan assets at December 31, 2017 and 2016 , by asset category, are as follows (in millions): Fair Value Measurements as of December 31, 2017 Asset Category Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Cash and cash equivalents $ 28 $ — $ — $ 28 Equity securities: International markets (a) (b) 3,837 — — 3,837 Large-cap companies (b) 2,451 — — 2,451 Mid-cap companies (b) 744 — — 744 Small-cap companies (b) 125 — — 125 Fixed income: Corporate bonds (c) — 2,344 — 2,344 Government securities (d) — 238 — 238 U.S. municipal securities — 39 — 39 Alternative instruments: Private equity partnerships (e) — — 14 14 Private equity partnerships measured at net asset value (e) (g) — — — 879 Common/collective trusts (f) — 315 — 315 Common/collective trusts and 103-12 Investment Trust measured at net asset value (f) (g) — — — 283 Insurance group annuity contracts — — 2 2 Dividend and interest receivable 44 — — 44 Due to/from brokers for sale of securities – net 3 — — 3 Other liabilities – net (6 ) — — (6 ) Total $ 7,226 $ 2,936 $ 16 $ 11,340 a) Holdings are diversified as follows: 17% United Kingdom, 11% Japan, 9% France, 6% Switzerland, 16% emerging markets and the remaining 41% with no concentration greater than 5% in any one country. b) There are no significant concentrations of holdings by company or industry. c) Includes approximately 76% investments in corporate debt with a S&P rating lower than A and 24% investments in corporate debt with a S&P rating A or higher. Holdings include 85% U.S. companies, 12% international companies and 3% emerging market companies. d) Includes approximately 27% investments in U.S. domestic government securities, 43% in emerging market government securities and 30% in international government securities. There are no significant foreign currency risks within this classification. e) Includes limited partnerships that invest primarily in U.S. ( 94% ) and European ( 6% ) buyout opportunities of a range of privately held companies. The pension plan’s master trust does not have the right to redeem its limited partnership investment at its net asset value, but rather receives distributions as the underlying assets are liquidated. It is estimated that the underlying assets of these funds will be gradually liquidated over the next one to ten years . Additionally, the pension plan’s master trust has future funding commitments of approximately $903 million over the next ten years . f) Investment includes 42% in a collective interest trust investing primarily in short-term securities, 40% in an emerging market 103-12 Investment Trust with investments in emerging country equity securities, 10% in Canadian segregated balanced value, income growth and diversified pooled funds and 8% in a common/collective trust investing in securities of smaller companies located outside the U.S., including developing markets. For some trusts, requests for withdrawals must meet specific requirements with advance notice of redemption preferred. g) Certain investments that are measured using net asset value per share (or its equivalent) as a practical expedient for fair value have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the notes to the consolidated financial statements. Fair Value Measurements as of December 31, 2016 Asset Category Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Cash and cash equivalents $ 573 $ — $ — $ 573 Equity securities: International markets (a) (b) 3,232 — — 3,232 Large-cap companies (b) 2,253 — — 2,253 Mid-cap companies (b) 371 — — 371 Small-cap companies (b) 6 — — 6 Fixed income: Corporate bonds (c) — 2,337 — 2,337 Government securities (d) — 150 — 150 U.S. municipal securities — 37 — 37 Alternative instruments: Private equity partnerships (e) — — 21 21 Private equity partnerships measured at net asset value (e) (g) — — — 703 Common/collective trusts (f) — 32 — 32 Common/collective trusts and 103-12 Investment Trust measured at net asset value (f) (g) — — — 227 Insurance group annuity contracts — — 2 2 Dividend and interest receivable 40 — — 40 Due to/from brokers for sale of securities – net (9 ) — — (9 ) Other liabilities – net (7 ) — — (7 ) Total $ 6,459 $ 2,556 $ 23 $ 9,968 a) Holdings are diversified as follows: 15% United Kingdom, 12% Japan, 10% France, 7% Switzerland, 6% Netherlands, 17% other emerging markets and the remaining 33% with no concentration greater than 5% in any one country. b) There are no significant concentrations of holdings by company or industry. c) Includes approximately 74% investments in corporate debt with a S&P rating lower than A and 26% investments in corporate debt with a S&P rating A or higher. Holdings include 86% U.S. companies, 12% international companies and 2% emerging market companies. d) Includes approximately 61% investments in U.S. domestic government securities and 39% in emerging market government securities. There are no significant foreign currency risks within this classification. e) Includes limited partnerships that invest primarily in U.S. ( 95% ) and European ( 5% ) buyout opportunities of a range of privately held companies. The pension plan’s master trust does not have the right to redeem its limited partnership investment at its net asset value, but rather receives distributions as the underlying assets are liquidated. It is estimated that the underlying assets of these funds will be gradually liquidated over the next one to ten years . Additionally, the pension plan’s master trust has future funding commitments of approximately $456 million over the next ten years . f) Investment includes 73% in an emerging market 103-12 Investment Trust with investments in emerging country equity securities, 12% in Canadian segregated balanced value, income growth and diversified pooled funds and 15% in a common/collective trust investing in securities of smaller companies located outside the U.S., including developing markets. Requests for withdrawals must meet specific requirements with advance notice of redemption preferred. g) Certain investments that are measured using net asset value per share (or its equivalent) as a practical expedient for fair value have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the notes to the consolidated financial statements. Changes in fair value measurements of Level 3 investments during the year ended December 31, 2017 , were as follows (in millions): Private Equity Partnerships Insurance Group Annuity Contracts Beginning balance at December 31, 2016 $ 21 $ 2 Actual loss on plan assets: Relating to assets still held at the reporting date (4 ) — Purchases 1 — Sales (1 ) — Transfers out (3 ) — Ending balance at December 31, 2017 $ 14 $ 2 Changes in fair value measurements of Level 3 investments during the year ended December 31, 2016 , were as follows (in millions): Private Equity Partnerships Insurance Group Annuity Contracts Beginning balance at December 31, 2015 $ 16 $ 2 Actual return on plan assets: Relating to assets sold during the period 7 — Purchases 7 — Sales (9 ) — Ending balance at December 31, 2016 $ 21 $ 2 The fair value of American’s retiree medical and other postretirement benefits plans assets at December 31, 2017 by asset category, were as follows (in millions): Fair Value Measurements as of December 31, 2017 Asset Category Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Money market fund $ 5 $ — $ — $ 5 Mutual funds – AAL Class — 290 — 290 Total $ 5 $ 290 $ — $ 295 The fair value of American’s retiree medical and other postretirement benefits plans assets at December 31, 2016 by asset category, were as follows (in millions): Fair Value Measurements as of December 31, 2016 Asset Category Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Money market fund $ 5 $ — $ — $ 5 Mutual funds – Institutional Class 261 — — 261 Total $ 266 $ — $ — $ 266 Investments in the retiree medical and other postretirement benefits plans’ mutual funds are valued by quoted prices on the active market, which is fair value and represents the net asset value of the shares of such funds as of the close of business at the end of the period. At December 31, 2017, these funds were invested in an AAL Class mutual fund, in which trading is restricted only to American, resulting in a fair value classification of Level 2. At December 31, 2016, these investments were part of an Institutional Class of mutual funds and were actively traded on the open market resulting in a fair value classification of Level 1. Investments include approximately 30% and 27% of investments in non-U.S. common stocks in 2017 and 2016 , respectively. Net asset value is based on the fair market value of the funds’ underlying assets and liabilities at the date of determination. Profit Sharing Program American accrues 5% of its pre-tax income excluding special items for its profit sharing program. For the year ended December 31, 2017 , American accrued $241 million for this program, which will be distributed to employees in the first quarter of 2018.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The components of accumulated other comprehensive income (loss) (AOCI) are as follows (in millions): Pension, Unrealized Gain (Loss) on Investments Income Tax (1) Total Balance at December 31, 2015 $ (3,842 ) $ (10 ) $ (880 ) $ (4,732 ) Other comprehensive income (loss) before reclassifications (462 ) 10 166 (286 ) Amounts reclassified from AOCI (102 ) — 37 (2) (65 ) Net current-period other comprehensive income (loss) (564 ) 10 203 (351 ) Balance at December 31, 2016 (4,406 ) — (677 ) (5,083 ) Other comprehensive income (loss) before reclassifications (30 ) (1 ) 15 (16 ) Amounts reclassified from AOCI (87 ) — 32 (2) (55 ) Net current-period other comprehensive income (loss) (117 ) (1 ) 47 (71 ) Balance at December 31, 2017 $ (4,523 ) $ (1 ) $ (630 ) $ (5,154 ) (1) Relates principally to pension, retiree medical and other postretirement benefits obligations that will not be recognized in net income until the obligations are fully extinguished. (2) Relates to pension, retiree medical and other postretirement benefits obligations and is recognized within the income tax provision on the consolidated statement of operations. Reclassifications out of AOCI for the years ended December 31, 2017 and 2016 are as follows (in millions): Amount reclassified from AOCI Affected line items on the consolidated statement of operations Year Ended December 31, AOCI Components 2017 2016 Amortization of pension, retiree medical and other postretirement benefits: Prior service benefit $ (132 ) $ (134 ) Salaries, wages and benefits Actuarial loss 77 69 Salaries, wages and benefits Total reclassifications for the period, net of tax $ (55 ) $ (65 ) Amounts allocated to OCI for income taxes as further described in Note 6 will remain in AOCI until we cease all related activities, such as termination of the pension plan.
American Airlines, Inc. [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The components of accumulated other comprehensive income (loss) (AOCI) are as follows (in millions): Pension, Unrealized Gain (Loss) on Investments Income (1) Total Balance at December 31, 2015 $ (3,831 ) $ (9 ) $ (991 ) $ (4,831 ) Other comprehensive income (loss) before reclassifications (461 ) 9 166 (286 ) Amounts reclassified from AOCI (102 ) — 37 (2) (65 ) Net current-period other comprehensive income (loss) (563 ) 9 203 (351 ) Balance at December 31, 2016 (4,394 ) — (788 ) (5,182 ) Other comprehensive income (loss) before reclassifications (27 ) (1 ) 14 (14 ) Amounts reclassified from AOCI (87 ) — 32 (2) (55 ) Net current-period other comprehensive income (loss) (114 ) (1 ) 46 (69 ) Balance at December 31, 2017 $ (4,508 ) $ (1 ) $ (742 ) $ (5,251 ) (1) Relates principally to pension, retiree medical and other postretirement benefits obligations that will not be recognized in net income until the obligations are fully extinguished. (2) Relates to pension, retiree medical and other postretirement benefits obligations and is recognized within the income tax provision on the consolidated statement of operations. Reclassifications out of AOCI for the years ended December 31, 2017 and 2016 are as follows (in millions): Amount reclassified from AOCI Affected line items on the consolidated statement of operations Year Ended December 31, AOCI Components 2017 2016 Amortization of pension, retiree medical and other postretirement benefits: Prior service benefit $ (132 ) $ (134 ) Salaries, wages and benefits Actuarial loss 77 69 Salaries, wages and benefits Total reclassifications for the period, net of tax $ (55 ) $ (65 ) Amounts allocated to OCI for income taxes as further described in Note 4 will remain in AOCI until American ceases all related activities, such as termination of the pension plan.

Commitments, Contingencies and

Commitments, Contingencies and Guarantees	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies [Line Items]
Commitments, Contingencies and Guarantees	Commitments, Contingencies and Guarantees (a) Aircraft and Engine Purchase Commitments Under all of our aircraft and engine purchase agreements, our total future commitments as of December 31, 2017 are expected to be as follows (approximately, in millions): 2018 2019 2020 2021 2022 2023 and Thereafter Total Payments for aircraft commitments and certain engines (1) $ 1,826 $ 2,730 $ 2,730 $ 2,858 $ 2,138 $ 1,482 $ 13,764 (1) These amounts are net of purchase deposits currently held by the manufacturers and include all commitments for regional aircraft. American has granted a security interest in its purchase deposits with Boeing. Our purchase deposits held by all manufacturers totaled $1.2 billion as of December 31, 2017 . (b) Operating Leases and Other We lease certain aircraft, engines and ground equipment, in addition to the majority of our ground facilities and terminal space. As of December 31, 2017 , we had 421 aircraft under operating leases, with remaining terms ranging from three months to approximately 12 years . Airports are utilized for flight operations under lease arrangements with the municipalities or agencies owning or controlling such airports. Substantially all leases provide that the lessee must pay taxes, maintenance, insurance and certain other operating expenses applicable to the leased property. Some leases also include renewal and purchase options. As of December 31, 2017 , obligations under noncancellable operating leases for future minimum lease payments are as follows (approximately, in millions): 2018 2019 2020 2021 2022 2023 and Thereafter Total Future minimum lease payments $ 2,195 $ 1,974 $ 1,784 $ 1,339 $ 1,159 $ 3,266 $ 11,717 Mainline and regional rent expense, excluding landing fees, was $2.8 billion in each of 2017 , 2016 and 2015 . Additionally, we have purchase commitments related to jet fuel, facility construction projects and information technology support as follows (approximately): $2.0 billion in 2018 , $1.4 billion in 2019 , $890 million in 2020 and $950 million in 2021 . (c) Capacity Purchase Agreements with Third-Party Regional Carriers American has capacity purchase agreements with third-party regional carriers. The capacity purchase agreements provide that all revenues, including passenger, in-flight, ancillary, mail and freight revenues, go to American. In return, American agrees to pay predetermined fees to these airlines for operating an agreed-upon number of aircraft, without regard to the number of passengers on board. In addition, these agreements provide that American reimburses 100% of certain variable costs, such as airport landing fees and passenger liability insurance. American controls marketing, scheduling, ticketing, pricing and seat inventories. As of December 31, 2017 , American’s capacity purchase agreements with third-party regional carriers had expiration dates ranging from 2018 to 2027, with rights of American to extend the respective terms of certain agreements. See Part I, Item 2. Properties for unaudited information on the aircraft operated by third-party regional carriers under such capacity purchase agreements. As of December 31, 2017 , American’s minimum fixed obligations under its capacity purchase agreements with third-party regional carriers are as follows (approximately, in millions): 2018 2019 2020 2021 2022 2023 and Thereafter Total Minimum fixed obligations under capacity purchase agreements with third-party regional carriers (1) $ 1,457 $ 1,311 $ 1,063 $ 866 $ 699 $ 2,073 $ 7,469 (1) Represents minimum payments under capacity purchase agreements with third-party regional carriers. These commitments are estimates of costs based on assumed minimum levels of flying under the capacity purchase agreements and American’s actual payments could differ materially. These obligations also include the portion of American’s future obligations representing the lease of aircraft for accounting purposes in the amount of approximately $377 million in 2018 , $355 million in 2019 , $320 million in 2020 , $282 million in 2021 , $239 million in 2022 and $699 million in 2023 and thereafter . (d) Off-Balance Sheet Arrangements Aircraft American currently operates 387 owned aircraft and 113 leased aircraft which were financed with EETCs issued by pass-through trusts. These trusts are off-balance sheet entities, the primary purpose of which is to finance the acquisition of flight equipment. Rather than finance each aircraft separately when such aircraft is purchased, delivered or refinanced, these trusts allow American to raise the financing for a number of aircraft at one time and, if applicable, place such funds in escrow pending a future purchase, delivery or refinancing of the relevant aircraft. The trusts were also structured to provide for certain credit enhancements, such as liquidity facilities to cover certain interest payments, that reduce the risks to the purchasers of the trust certificates and, as a result, reduce the cost of aircraft financing to American. Each trust covers a set number of aircraft scheduled to be delivered or refinanced upon the issuance of the EETC or within a specific period of time thereafter. At the time of each covered aircraft financing, the relevant trust used the proceeds of the issuance of the EETC (which may have been available at the time of issuance thereof or held in escrow until financing of the applicable aircraft following its delivery) to purchase equipment notes relating to the financed aircraft. The equipment notes are issued, at American’s election, in connection with a mortgage financing of the aircraft or, in certain cases, by a separate owner trust in connection with a leveraged lease financing of the aircraft. In the case of a leveraged lease financing, the owner trust then leases the aircraft to American. In both cases, the equipment notes are secured by a security interest in the aircraft. The pass-through trust certificates are not direct obligations of, nor are they guaranteed by, AAG or American. However, in the case of mortgage financings, the equipment notes issued to the trusts are direct obligations of American and, in certain instances, have been guaranteed by AAG. As of December 31, 2017 , $11.9 billion associated with these mortgage financings is reflected as debt in the accompanying consolidated balance sheet. With respect to leveraged leases, American evaluated whether the leases had characteristics of a variable interest entity. American concluded the leasing entities met the criteria for variable interest entities. American generally is not the primary beneficiary of the leasing entities if the lease terms are consistent with market terms at the inception of the lease and do not include a residual value guarantee, fixed-price purchase option or similar feature that obligates American to absorb decreases in value or entitles American to participate in increases in the value of the aircraft. American does not provide residual value guarantees to the bondholders or equity participants in the trusts. Some leases have a fair market value or a fixed price purchase option that allows American to purchase the aircraft at or near the end of the lease term. However, the option price approximates an estimate of the aircraft’s fair value at the option date. Under this feature, American does not participate in any increases in the value of the aircraft. American concluded it is not the primary beneficiary under these arrangements. Therefore, American accounts for the majority of its EETC leveraged lease financings as operating leases. American’s total future obligations to the trusts of each of the relevant EETCs under these leveraged lease financings are $572 million as of December 31, 2017 , which are included in the future minimum lease payments table above. Letters of Credit and Other We provide financial assurance, such as letters of credit, surety bonds or restricted cash and investments, to primarily support projected workers’ compensation obligations and airport commitments. As of December 31, 2017, we had $448 million of letters of credit and surety bonds securing various obligations, of which $88 million is collateralized with our restricted cash. The letters of credit and surety bonds that are subject to expiration will expire on various dates through 2022. (e) Legal Proceedings Chapter 11 Cases . On November 29, 2011, AMR, American, and certain of AMR’s other direct and indirect domestic subsidiaries (the Debtors) filed voluntary petitions for relief under Chapter 11 of the United States Bankruptcy Code in the United States Bankruptcy Court for the Southern District of New York (the Bankruptcy Court). On October 21, 2013, the Bankruptcy Court entered an order approving and confirming the Debtors’ fourth amended joint plan of reorganization (as amended, the Plan). On the Effective Date, December 9, 2013, the Debtors consummated their reorganization pursuant to the Plan and completed the Merger. Pursuant to rulings of the Bankruptcy Court, the Plan established the Disputed Claims Reserve to hold shares of AAG common stock reserved for issuance to disputed claimholders at the Effective Date that ultimately become holders of allowed claims. As of December 31, 2017 , there were approximately 24.5 million shares of AAG common stock remaining in the Disputed Claims Reserve. As disputed claims are resolved, the claimants will receive distributions of shares from the Disputed Claims Reserve on the same basis as if such distributions had been made on or about the Effective Date. However, we are not required to distribute additional shares above the limits contemplated by the Plan, even if the shares remaining for distribution are not sufficient to fully pay any additional allowed unsecured claims. To the extent that any of the reserved shares remain undistributed upon resolution of all remaining disputed claims, such shares will not be returned to us but rather will be distributed to former AMR stockholders. There is also pending in the Bankruptcy Court an adversary proceeding relating to an action brought by American to seek a determination that certain non-pension, postemployment benefits are not vested benefits and thus may be modified or terminated without liability to American. On April 18, 2014, the Bankruptcy Court granted American’s motion for summary judgment with respect to certain non-union employees, concluding that their benefits were not vested and could be terminated. The summary judgment motion was denied with respect to all other retirees. The Bankruptcy Court has not yet scheduled a trial on the merits concerning whether those retirees’ benefits are vested, and American cannot predict whether it will receive relief from obligations to provide benefits to any of those retirees. Our financial statements presently reflect these retirement programs without giving effect to any modification or termination of benefits that may ultimately be implemented based upon the outcome of this proceeding. DOJ Antitrust Civil Investigative Demand . In June 2015, we received a Civil Investigative Demand (CID) from the United States Department of Justice (DOJ) as part of an investigation into whether there have been illegal agreements or coordination of air passenger capacity. The CID seeks documents and other information from us, and other airlines have announced that they have received similar requests. We are cooperating fully with the DOJ investigation. Private Party Antitrust Action . Subsequent to announcement of the delivery of CIDs by the DOJ, we, along with Delta Air Lines, Inc., Southwest Airlines Co., United Airlines, Inc. and, in the case of litigation filed in Canada, Air Canada, have been named as defendants in approximately 100 putative class action lawsuits alleging unlawful agreements with respect to air passenger capacity, although Southwest has entered into a settlement with the plaintiffs that is pending approval by the court. The U.S. lawsuits have been consolidated in the Federal District Court for the District of Columbia. On October 28, 2016, the Court denied a motion by the airline defendants to dismiss all claims in the class actions. These lawsuits are in their relatively early stages and we intend to defend these matters vigorously. Private Party Antitrust Action Related to the Merger . On July 2, 2013, a lawsuit captioned Carolyn Fjord, et al., v. US Airways Group, Inc., et al., was filed in the United States District Court for the Northern District of California. The complaint named as defendants US Airways Group and US Airways, Inc., alleged that the effect of the Merger may be to create a monopoly in violation of Section 7 of the Clayton Antitrust Act, and sought injunctive relief and/or divestiture. On August 6, 2013, the plaintiffs re-filed their complaint in the Bankruptcy Court, adding AMR and American as defendants. On November 27, 2013, the Bankruptcy Court denied plaintiffs’ motion to preliminarily enjoin the Merger. On May 12, 2017, defendants filed a motion for summary judgment. On June 23, 2017, plaintiffs filed an opposition to defendants’ motion and cross-motion for summary judgment. Briefing of the parties’ respective motions concluded on September 1, 2017; a hearing date has not yet been set. We believe this lawsuit is without merit and intend to vigorously defend against the allegations. DOJ Investigation Related to the United States Postal Service . In April 2015, the DOJ informed us of an inquiry regarding American’s 2009 and 2011 contracts with the United States Postal Service for the international transportation of mail by air. In October 2015, we received a CID from the DOJ seeking certain information relating to these contracts and the DOJ has also sought information concerning certain of the airlines that transport mail on a codeshare basis. The DOJ has indicated it is investigating potential violations of the False Claims Act or other statutes. We are cooperating fully with the DOJ with regard to its investigation. General . In addition to the specifically identified legal proceedings, we and our subsidiaries are also engaged in other legal proceedings from time to time. Legal proceedings can be complex and take many months, or even years, to reach resolution, with the final outcome depending on a number of variables, some of which are not within our control. Therefore, although we will vigorously defend ourselves in each of the actions described above and such other legal proceedings, their ultimate resolution and potential financial and other impacts on us are uncertain but could be material. See Part I, Item 1A. Risk Factors – “We may be a party to litigation in the normal course of business or otherwise, which could affect our financial position and liquidity” for unaudited additional discussion. (f) Guarantees and Indemnifications We are party to many routine contracts in which we provide general indemnities in the normal course of business to third parties for various risks. We are not able to estimate the potential amount of any liability resulting from the indemnities. These indemnities are discussed in the following paragraphs. In our aircraft financing agreements, we generally indemnify the financing parties, trustees acting on their behalf and other relevant parties against liabilities (including certain taxes) resulting from the financing, manufacture, design, ownership, operation and maintenance of the aircraft regardless of whether these liabilities (or taxes) relate to the negligence of the indemnified parties. Our loan agreements and other LIBOR-based financing transactions (including certain leveraged aircraft leases) generally obligate us to reimburse the applicable lender for incremental costs due to a change in law that imposes (i) any reserve or special deposit requirement against assets of, deposits with or credit extended by such lender related to the loan, (ii) any tax, duty or other charge with respect to the loan (except standard income tax) or (iii) capital adequacy requirements. In addition, our loan agreements and other financing arrangements typically contain a withholding tax provision that requires us to pay additional amounts to the applicable lender or other financing party, generally if withholding taxes are imposed on such lender or other financing party as a result of a change in the applicable tax law. In certain transactions, including certain aircraft financing leases and loans, the lessors, lenders and/or other parties have rights to terminate the transaction based on changes in foreign tax law, illegality or certain other events or circumstances. In such a case, we may be required to make a lump sum payment to terminate the relevant transaction. We have general indemnity clauses in many of our airport and other real estate leases where we as lessee indemnify the lessor (and related parties) against liabilities related to our use of the leased property. Generally, these indemnifications cover liabilities resulting from the negligence of the indemnified parties, but not liabilities resulting from the gross negligence or willful misconduct of the indemnified parties. In addition, we provide environmental indemnities in many of these leases for contamination related to our use of the leased property. Under certain contracts with third parties, we indemnify the third-party against legal liability arising out of an action by the third-party, or certain other parties. The terms of these contracts vary and the potential exposure under these indemnities cannot be determined. We have liability insurance protecting us for some of the obligations we have undertaken under these indemnities. American is required to make principal and interest payments for certain special facility revenue bonds issued by municipalities primarily to build or improve airport facilities and purchase equipment, which are leased to American. The payment of principal and interest of certain special facility revenue bonds is guaranteed by AAG. As of December 31, 2017 , the remaining lease payments through 2035 guaranteeing the principal and interest on these bonds are $589 million , which are accounted for as operating leases. As of December 31, 2017 , AAG had issued guarantees covering approximately $810 million principal amount of American’s special facility revenue bonds (and interest thereon) and $8.5 billion principal amount of American’s secured debt (and interest thereon), including the Credit Facilities and certain EETC financings. (g) Credit Card Processing Agreements We have agreements with companies that process customer credit card transactions for the sale of air travel and other services. Our agreements allow these processing companies, under certain conditions, to hold an amount of our cash (referred to as a holdback) equal to a portion of advance ticket sales that have been processed by that company, but for which we have not yet provided the air transportation. Additional holdback requirements in the event of material adverse changes in our financial condition will reduce our liquidity in the form of unrestricted cash by the amount of the holdbacks. We are not currently required to maintain any holdbacks pursuant to these requirements. (h) Labor Negotiations As of December 31, 2017 , we employed approximately 126,600 active full-time equivalent employees, of which 23,500 were employed by our regional operations. Approximately 85% of employees are covered by collective bargaining agreements with various labor unions. Negotiations for joint collective bargaining agreements covering our mainline maintenance, fleet service, stock clerks, maintenance control technicians and maintenance training instructors employees as well as for certain employee groups at our wholly-owned regional subsidiaries are continuing. There is no assurance that a successful or timely resolution of these labor negotiations will be achieved. (i) Other As a result of the terrorist attacks of September 11, 2001 and the subsequent liability protections provided for by the Air Transportation Safety and System Stabilization Act (the Stabilization Act), we recorded a liability for these terrorist attacks claims equal to the related insurance receivable due to us. The Stabilization Act provides that, notwithstanding any other provision of law, liability for all claims, whether compensatory or punitive, arising from these terrorist attacks, against any air carrier shall not exceed the liability coverage maintained by the air carrier. As of December 31, 2017 , claims relating to this matter have been substantially resolved and the remaining liability and the amount of the offsetting receivable are not material.
American Airlines, Inc. [Member]
Commitments and Contingencies [Line Items]
Commitments, Contingencies and Guarantees	Commitments, Contingencies and Guarantees (a) Aircraft and Engine Purchase Commitments Under all of American’s aircraft and engine purchase agreements, its total future commitments as of December 31, 2017 are expected to be as follows (approximately, in millions): 2018 2019 2020 2021 2022 2023 and Thereafter Total Payments for aircraft commitments and certain engines (1) $ 1,826 $ 2,730 $ 2,730 $ 2,858 $ 2,138 $ 1,482 $ 13,764 (1) These amounts are net of purchase deposits currently held by the manufacturers and include all commitments for regional aircraft. American has granted a security interest in its purchase deposits with Boeing. American’s purchase deposits held by all manufacturers totaled $1.2 billion as of December 31, 2017 . (b) Operating Leases and Other American leases certain aircraft, engines and ground equipment, in addition to the majority of its ground facilities and terminal space. As of December 31, 2017 , American had 410 aircraft under operating leases, with remaining terms ranging from three months to approximately 12 years . Airports are utilized for flight operations under lease arrangements with the municipalities or agencies owning or controlling such airports. Substantially all leases provide that the lessee must pay taxes, maintenance, insurance and certain other operating expenses applicable to the leased property. Some leases also include renewal and purchase options. As of December 31, 2017 , obligations under noncancellable operating leases for future minimum lease payments are as follows (approximately, in millions): 2018 2019 2020 2021 2022 2023 and Thereafter Total Future minimum lease payments $ 2,178 $ 1,966 $ 1,776 $ 1,331 $ 1,155 $ 3,253 $ 11,659 Mainline and regional rent expense, excluding landing fees, was $2.8 billion in 2017 and $2.7 billion in each of 2016 and 2015 . Additionally, American has purchase commitments related to jet fuel, facility construction projects and information technology support as follows (approximately): $2.0 billion in 2018 , $1.4 billion in 2019 , $890 million in 2020 and $950 million in 2021 . (c) Capacity Purchase Agreements with Third-Party Regional Carriers American has capacity purchase agreements with third-party regional carriers. The capacity purchase agreements provide that all revenues, including passenger, in-flight, ancillary, mail and freight revenues, go to American. In return, American agrees to pay predetermined fees to these airlines for operating an agreed-upon number of aircraft, without regard to the number of passengers on board. In addition, these agreements provide that American reimburses 100% of certain variable costs, such as airport landing fees and passenger liability insurance. American controls marketing, scheduling, ticketing, pricing and seat inventories. As of December 31, 2017 , American’s capacity purchase agreements with third-party regional carriers had expiration dates ranging from 2018 to 2027, with rights of American to extend the respective terms of certain agreements. See Part I, Item 2. Properties for unaudited information on the aircraft operated by third-party regional carriers under such capacity purchase agreements. As of December 31, 2017 , American’s minimum fixed obligations under its capacity purchase agreements with third-party regional carriers are as follows (approximately, in millions): 2018 2019 2020 2021 2022 2023 and Thereafter Total Minimum fixed obligations under capacity purchase agreements with third-party regional carriers (1) $ 1,457 $ 1,311 $ 1,063 $ 866 $ 699 $ 2,073 $ 7,469 (1) Represents minimum payments under capacity purchase agreements with third-party regional carriers. These commitments are estimates of costs based on assumed minimum levels of flying under the capacity purchase agreements and American’s actual payments could differ materially. These obligations also include the portion of American’s future obligations representing the lease of aircraft for accounting purposes in the amount of approximately $377 million in 2018 , $355 million in 2019 , $320 million in 2020 , $282 million in 2021 , $239 million in 2022 and $699 million in 2023 and thereafter . (d) Off-Balance Sheet Arrangements Aircraft American currently operates 387 owned aircraft and 113 leased aircraft which were financed with EETCs issued by pass-through trusts. These trusts are off-balance sheet entities, the primary purpose of which is to finance the acquisition of flight equipment. Rather than finance each aircraft separately when such aircraft is purchased, delivered or refinanced, these trusts allow American to raise the financing for a number of aircraft at one time and, if applicable, place such funds in escrow pending a future purchase, delivery or refinancing of the relevant aircraft. The trusts were also structured to provide for certain credit enhancements, such as liquidity facilities to cover certain interest payments, that reduce the risks to the purchasers of the trust certificates and, as a result, reduce the cost of aircraft financing to American. Each trust covers a set number of aircraft scheduled to be delivered or refinanced upon the issuance of the EETC or within a specific period of time thereafter. At the time of each covered aircraft financing, the relevant trust used the proceeds of the issuance of the EETC (which may have been available at the time of issuance thereof or held in escrow until financing of the applicable aircraft following its delivery) to purchase equipment notes relating to the financed aircraft. The equipment notes are issued, at American’s election, in connection with a mortgage financing of the aircraft or, in certain cases, by a separate owner trust in connection with a leveraged lease financing of the aircraft. In the case of a leveraged lease financing, the owner trust then leases the aircraft to American. In both cases, the equipment notes are secured by a security interest in the aircraft. The pass-through trust certificates are not direct obligations of, nor are they guaranteed by, AAG or American. However, in the case of mortgage financings, the equipment notes issued to the trusts are direct obligations of American and, in certain instances, have been guaranteed by AAG. As of December 31, 2017 , $11.9 billion associated with these mortgage financings is reflected as debt in the accompanying consolidated balance sheet. With respect to leveraged leases, American evaluated whether the leases had characteristics of a variable interest entity. American concluded the leasing entities met the criteria for variable interest entities. American generally is not the primary beneficiary of the leasing entities if the lease terms are consistent with market terms at the inception of the lease and do not include a residual value guarantee, fixed-price purchase option or similar feature that obligates American to absorb decreases in value or entitles American to participate in increases in the value of the aircraft. American does not provide residual value guarantees to the bondholders or equity participants in the trusts. Some leases have a fair market value or a fixed price purchase option that allows American to purchase the aircraft at or near the end of the lease term. However, the option price approximates an estimate of the aircraft’s fair value at the option date. Under this feature, American does not participate in any increases in the value of the aircraft. American concluded it is not the primary beneficiary under these arrangements. Therefore, American accounts for the majority of its EETC leveraged lease financings as operating leases. American’s total future obligations to the trusts of each of the relevant EETCs under these leveraged lease financings are $572 million as of December 31, 2017 , which are included in the future minimum lease payments table above. Letters of Credit and Other American provides financial assurance, such as letters of credit, surety bonds or restricted cash and investments, to primarily support projected workers’ compensation obligations and airport commitments. As of December 31, 2017, American had $448 million of letters of credit and surety bonds securing various obligations, of which $88 million is collateralized with its restricted cash. The letters of credit and surety bonds that are subject to expiration will expire on various dates through 2022. (e) Legal Proceedings Chapter 11 Cases . On November 29, 2011, AMR, American, and certain of AMR’s other direct and indirect domestic subsidiaries (the Debtors) filed voluntary petitions for relief under Chapter 11 of the United States Bankruptcy Code in the United States Bankruptcy Court for the Southern District of New York (the Bankruptcy Court). On October 21, 2013, the Bankruptcy Court entered an order approving and confirming the Debtors’ fourth amended joint plan of reorganization (as amended, the Plan). On the Effective Date, December 9, 2013, the Debtors consummated their reorganization pursuant to the Plan and completed the Merger. Pursuant to rulings of the Bankruptcy Court, the Plan established the Disputed Claims Reserve to hold shares of AAG common stock reserved for issuance to disputed claimholders at the Effective Date that ultimately become holders of allowed claims. As of December 31, 2017 , there were approximately 24.5 million shares of AAG common stock remaining in the Disputed Claims Reserve. As disputed claims are resolved, the claimants will receive distributions of shares from the Disputed Claims Reserve on the same basis as if such distributions had been made on or about the Effective Date. However, American is not required to distribute additional shares above the limits contemplated by the Plan, even if the shares remaining for distribution are not sufficient to fully pay any additional allowed unsecured claims. To the extent that any of the reserved shares remain undistributed upon resolution of all remaining disputed claims, such shares will not be returned to American but rather will be distributed to former AMR stockholders. There is also pending in the Bankruptcy Court an adversary proceeding relating to an action brought by American to seek a determination that certain non-pension, postemployment benefits are not vested benefits and thus may be modified or terminated without liability to American. On April 18, 2014, the Bankruptcy Court granted American’s motion for summary judgment with respect to certain non-union employees, concluding that their benefits were not vested and could be terminated. The summary judgment motion was denied with respect to all other retirees. The Bankruptcy Court has not yet scheduled a trial on the merits concerning whether those retirees’ benefits are vested, and American cannot predict whether it will receive relief from obligations to provide benefits to any of those retirees. American’s financial statements presently reflect these retirement programs without giving effect to any modification or termination of benefits that may ultimately be implemented based upon the outcome of this proceeding. DOJ Antitrust Civil Investigative Demand . In June 2015, American received a Civil Investigative Demand (CID) from the United States Department of Justice (DOJ) as part of an investigation into whether there have been illegal agreements or coordination of air passenger capacity. The CID seeks documents and other information from American, and other airlines have announced that they have received similar requests. American is cooperating fully with the DOJ investigation. Private Party Antitrust Action . Subsequent to announcement of the delivery of CIDs by the DOJ, American, along with Delta Air Lines, Inc., Southwest Airlines Co., United Airlines, Inc. and, in the case of litigation filed in Canada, Air Canada, have been named as defendants in approximately 100 putative class action lawsuits alleging unlawful agreements with respect to air passenger capacity, although Southwest has entered into a settlement with the plaintiffs that is pending approval by the court. The U.S. lawsuits have been consolidated in the Federal District Court for the District of Columbia. On October 28, 2016, the Court denied a motion by the airline defendants to dismiss all claims in the class actions. These lawsuits are in their relatively early stages and American intends to defend these matters vigorously. Private Party Antitrust Action Related to the Merger . On July 2, 2013, a lawsuit captioned Carolyn Fjord, et al., v. US Airways Group, Inc., et al., was filed in the United States District Court for the Northern District of California. The complaint named as defendants US Airways Group and US Airways, Inc., alleged that the effect of the Merger may be to create a monopoly in violation of Section 7 of the Clayton Antitrust Act, and sought injunctive relief and/or divestiture. On August 6, 2013, the plaintiffs re-filed their complaint in the Bankruptcy Court, adding AMR and American as defendants. On November 27, 2013, the Bankruptcy Court denied plaintiffs’ motion to preliminarily enjoin the Merger. On May 12, 2017, defendants filed a motion for summary judgment. On June 23, 2017, plaintiffs filed an opposition to defendants’ motion and cross-motion for summary judgment. Briefing of the parties’ respective motions concluded on September 1, 2017; a hearing date has not yet been set. American believes this lawsuit is without merit and intends to vigorously defend against the allegations. DOJ Investigation Related to the United States Postal Service . In April 2015, the DOJ informed American of an inquiry regarding American’s 2009 and 2011 contracts with the United States Postal Service for the international transportation of mail by air. In October 2015, American received a CID from the DOJ seeking certain information relating to these contracts and the DOJ has also sought information concerning certain of the airlines that transport mail on a codeshare basis. The DOJ has indicated it is investigating potential violations of the False Claims Act or other statutes. American is cooperating fully with the DOJ with regard to its investigation. General . In addition to the specifically identified legal proceedings, American and its subsidiaries are also engaged in other legal proceedings from time to time. Legal proceedings can be complex and take many months, or even years, to reach resolution, with the final outcome depending on a number of variables, some of which are not within American’s control. Therefore, although American will vigorously defend itself in each of the actions described above and such other legal proceedings, their ultimate resolution and potential financial and other impacts on American are uncertain but could be material. See Part I, Item 1A. Risk Factors – “We may be a party to litigation in the normal course of business or otherwise, which could affect our financial position and liquidity” for unaudited additional discussion. (f) Guarantees and Indemnifications American is a party to many routine contracts in which it provides general indemnities in the normal course of business to third parties for various risks. American is not able to estimate the potential amount of any liability resulting from the indemnities. These indemnities are discussed in the following paragraphs. In its aircraft financing agreements, American generally indemnifies the financing parties, trustees acting on their behalf and other relevant parties against liabilities (including certain taxes) resulting from the financing, manufacture, design, ownership, operation and maintenance of the aircraft regardless of whether these liabilities (or taxes) relate to the negligence of the indemnified parties. American’s loan agreements and other LIBOR-based financing transactions (including certain leveraged aircraft leases) generally obligate American to reimburse the applicable lender for incremental costs due to a change in law that imposes (i) any reserve or special deposit requirement against assets of, deposits with or credit extended by such lender related to the loan, (ii) any tax, duty or other charge with respect to the loan (except standard income tax) or (iii) capital adequacy requirements. In addition, American’s loan agreements and other financing arrangements typically contain a withholding tax provision that requires American to pay additional amounts to the applicable lender or other financing party, generally if withholding taxes are imposed on such lender or other financing party as a result of a change in the applicable tax law. In certain transactions, including certain aircraft financing leases and loans, the lessors, lenders and/or other parties have rights to terminate the transaction based on changes in foreign tax law, illegality or certain other events or circumstances. In such a case, American may be required to make a lump sum payment to terminate the relevant transaction. American has general indemnity clauses in many of its airport and other real estate leases where American as lessee indemnifies the lessor (and related parties) against liabilities related to American’s use of the leased property. Generally, these indemnifications cover liabilities resulting from the negligence of the indemnified parties, but not liabilities resulting from the gross negligence or willful misconduct of the indemnified parties. In addition, American provides environmental indemnities in many of these leases for contamination related to American’s use of the leased property. Under certain contracts with third parties, American indemnifies the third-party against legal liability arising out of an action by the third-party, or certain other parties. The terms of these contracts vary and the potential exposure under these indemnities cannot be determined. American has liability insurance protecting American for some of the obligations it has undertaken under these indemnities. American is required to make principal and interest payments for certain special facility revenue bonds issued by municipalities primarily to build or improve airport facilities and purchase equipment, which are leased to American. The payment of principal and interest of certain special facility revenue bonds is guaranteed by American. As of December 31, 2017 , the remaining lease payments through 2035 guaranteeing the principal and interest on these bonds are $589 million , which are accounted for as operating leases. As of December 31, 2017 , American had issued guarantees covering AAG’s $500 million aggregate principal amount of 6.125% senior notes due 2018 , $750 million aggregate principal amount of 5.50% senior notes due 2019 and $500 million aggregate principal amount of 4.625% senior notes due 2020 . (g) Credit Card Processing Agreements American has agreements with companies that process customer credit card transactions for the sale of air travel and other services. American’s agreements allow these processing companies, under certain conditions, to hold an amount of its cash (referred to as a holdback) equal to a portion of advance ticket sales that have been processed by that company, but for which American has not yet provided the air transportation. Additional holdback requirements in the event of material adverse changes in American’s financial condition will reduce its liquidity in the form of unrestricted cash by the amount of the holdbacks. American is not currently required to maintain any holdbacks pursuant to these requirements. (h) Labor Negotiations As of December 31, 2017 , American employed approximately 103,100 active full-time equivalent employees. Approximately 84% of employees are covered by collective bargaining agreements with various labor unions. Negotiations for joint collective bargaining agreements covering American’s maintenance, fleet service, stock clerks, maintenance control technicians and maintenance training instructors employees are continuing. There is no assurance that a successful or timely resolution of these labor negotiations will be achieved. (i) Other As a result of the terrorist attacks of September 11, 2001 and the subsequent liability protections provided for by the Air Transportation Safety and System Stabilization Act (the Stabilization Act), American recorded a liability for these terrorist attacks claims equal to the related insurance receivable due to American. The Stabilization Act provides that, notwithstanding any other provision of law, liability for all claims, whether compensatory or punitive, arising from these terrorist attacks, against any air carrier shall not exceed the liability coverage maintained by the air carrier. As of December 31, 2017 , claims relating to this matter have been substantially resolved and the remaining liability and the amount of the offsetting receivable are not material.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2017
Other Significant Noncash Transactions [Line Items]
Supplemental Cash Flow Information	Supplemental Cash Flow Information Supplemental disclosure of cash flow information and non-cash investing and financing activities are as follows (in millions): Year Ended December 31, 2017 2016 2015 Non-cash investing and financing activities: Equity investment $ 120 $ — $ — Settlement of bankruptcy obligations 15 3 63 Capital lease obligations — — 5 Supplemental information: Interest paid, net 1,040 964 873 Income taxes paid 20 16 20
American Airlines, Inc. [Member]
Other Significant Noncash Transactions [Line Items]
Supplemental Cash Flow Information	Supplemental Cash Flow Information Supplemental disclosure of cash flow information and non-cash investing and financing activities are as follows (in millions): Year Ended December 31, 2017 2016 2015 Non-cash investing and financing activities: Equity investment $ 120 $ — $ — Settlement of bankruptcy obligations 15 3 63 Capital lease obligations — — 5 Supplemental information: Interest paid, net 942 867 787 Income taxes paid 18 14 19

Operating Segments and Related

Operating Segments and Related Disclosures	12 Months Ended
	Dec. 31, 2017
Segment Reporting Information [Line Items]
Operating Segments and Related Disclosures	Operating Segments and Related Disclosures We are managed as a single business unit that provides air transportation for passengers and cargo. This allows us to benefit from an integrated revenue pricing and route network that includes American and our wholly-owned and third-party regional carriers that fly under capacity purchase agreements operating as American Eagle. The flight equipment of all these carriers is combined to form one fleet that is deployed through a single route scheduling system. Financial information and annual operational plans and forecasts are prepared and reviewed by the chief operating decision maker at the consolidated level. When making operational decisions, the chief operating decision maker evaluates flight profitability data, which considers aircraft type and route economics, but is indifferent to the results of the individual wholly-owned regional carriers. The objective in making operational decisions is to maximize consolidated financial results, not the individual results of American or American Eagle. Our operating revenues by geographic region as defined by the U.S. Department of Transportation (DOT) are summarized below (in millions): Year Ended December 31, 2017 2016 2015 DOT Domestic $ 29,612 $ 28,620 $ 28,761 DOT Latin America 5,422 4,995 5,539 DOT Atlantic 5,059 4,769 5,146 DOT Pacific 2,114 1,796 1,544 Total operating revenues $ 42,207 $ 40,180 $ 40,990 We attribute operating revenues by geographic region based upon the origin and destination of each flight segment. Our tangible assets consist primarily of flight equipment, which are mobile across geographic markets and, therefore, have not been allocated.
American Airlines, Inc. [Member]
Segment Reporting Information [Line Items]
Operating Segments and Related Disclosures	Operating Segments and Related Disclosures American is managed as a single business unit that provides air transportation for passengers and cargo. This allows it to benefit from an integrated revenue pricing and route network that includes American and AAG’s wholly-owned and third-party regional carriers that fly under capacity purchase agreements operating as American Eagle. The flight equipment of all these carriers is combined to form one fleet that is deployed through a single route scheduling system. Financial information and annual operational plans and forecasts are prepared and reviewed by the chief operating decision maker at the consolidated level. When making operational decisions, the chief operating decision maker evaluates flight profitability data, which considers aircraft type and route economics, but is indifferent to the results of the individual regional carriers. The objective in making operational decisions is to maximize consolidated financial results, not the individual results of American or American Eagle. American’s operating revenues by geographic region as defined by the U.S. Department of Transportation (DOT) are summarized below (in millions): Year Ended December 31, 2017 2016 2015 DOT Domestic $ 29,600 $ 28,603 $ 28,709 DOT Latin America 5,422 4,995 5,539 DOT Atlantic 5,059 4,769 5,146 DOT Pacific 2,114 1,796 1,544 Total operating revenues $ 42,195 $ 40,163 $ 40,938 American attributes operating revenues by geographic region based upon the origin and destination of each flight segment. American’s tangible assets consist primarily of flight equipment, which are mobile across geographic markets and, therefore, have not been allocated.

Share-based Compensation

Share-based Compensation	12 Months Ended
	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation	Share-based Compensation The 2013 AAG Incentive Award Plan (the 2013 Plan) provides that awards may be in the form of an option, restricted stock award, restricted stock unit award, performance award, dividend equivalent award, deferred stock award, deferred stock unit award, stock payment award or stock appreciation right. The 2013 Plan initially authorized the grant of awards for the issuance of up to 40 million shares. Any shares underlying awards granted under the 2013 Plan, or any pre-existing US Airways Group plan, that are forfeited, terminate or are settled in cash (in whole or in part) without the delivery of shares will again be available for grant. Our salaries, wages and benefits expense for the years ended December 31, 2017 , 2016 and 2015 included $90 million , $102 million and $274 million , respectively, of share-based compensation costs. Of the 2015 amount, $198 million was related to awards granted to certain employees in connection with the Merger and recorded in special items, net on the accompanying consolidated statements of operations. During 2017 , 2016 and 2015 , we withheld approximately 1.1 million , 1.4 million and 7.0 million shares of AAG common stock, respectively, and paid approximately $51 million , $56 million and $306 million , respectively, in satisfaction of certain tax withholding obligations associated with employee equity awards. (a) Restricted Stock Unit Awards (RSUs) We have granted RSUs with service conditions (time vested primarily over three years) and performance conditions. The grant-date fair value of RSUs is equal to the market price of the underlying shares of common stock on the date of grant. For time vested awards, the expense is recognized on a straight-line basis over the vesting period for the entire award. For awards with performance conditions, the expense is recognized based on the expected achievement at each reporting period. Stock-settled RSUs are classified as equity awards as the vesting results in the issuance of shares of AAG common stock. Stock-settled RSU award activity for all plans for the years ended December 31, 2017 , 2016 and 2015 is as follows: Number of Shares Weighted Average Grant Date Fair Value (In thousands) Outstanding at December 31, 2014 21,342 $ 26.43 Granted 2,213 46.62 Vested and released (17,163 ) 25.20 Forfeited (785 ) 27.12 Outstanding at December 31, 2015 5,607 $ 38.08 Granted 2,655 41.34 Vested and released (2,754 ) 34.83 Forfeited (321 ) 40.15 Outstanding at December 31, 2016 5,187 $ 41.48 Granted 2,309 48.58 Vested and released (2,708 ) 39.63 Forfeited (464 ) 44.48 Outstanding at December 31, 2017 4,324 $ 46.94 As of December 31, 2017 , there was $121 million of unrecognized compensation cost related to stock-settled RSUs. These costs are expected to be recognized over a weighted average period of one year . The total fair value of stock-settled RSUs vested during the years ended December 31, 2017 , 2016 and 2015 was $123 million , $107 million and $750 million , respectively. (b) Stock Appreciation Rights (SARs) We assumed US Airways Group’s outstanding SARs in connection with the Merger using an exchange ratio of one to one. These SARs were granted with an exercise price equal to the underlying common stock’s fair value at the date of each grant, have service conditions, become exercisable over a three -year vesting period and expire if unexercised at the end of their term, which ranges from seven to ten years . During 2017 , 2016 and 2015 , 0.8 million , 1.7 million and 3.0 million SARs, respectively, were exercised at weighted average exercise prices of $15.71 , $14.49 and $12.09 , respectively, for a total intrinsic value of $27 million , $49 million and $102 million , respectively. As of December 31, 2017 , we had 1.2 million SARs outstanding with an aggregate intrinsic value of $54 million and weighted average exercise price of $8.08 that expire between 2018 and 2020 if unexercised. (c) ASU 2016-09: Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting This ASU simplified the accounting for share-based payment award transactions including the financial statement presentation of excess tax benefits and deficiencies. We adopted this ASU during the second quarter of 2016, which resulted in the recognition of $418 million of previously unrecognized excess tax benefits in deferred tax assets and an increase to retained earnings on the consolidated balance sheet as of the beginning of 2016.
American Airlines, Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation	Share-based Compensation The 2013 AAG Incentive Award Plan (the 2013 Plan) provides that awards may be in the form of an option, restricted stock award, restricted stock unit award, performance award, dividend equivalent award, deferred stock award, deferred stock unit award, stock payment award or stock appreciation right. The 2013 Plan initially authorized the grant of awards for the issuance of up to 40 million shares. Any shares underlying awards granted under the 2013 Plan, or any pre-existing US Airways Group plan, that are forfeited, terminate or are settled in cash (in whole or in part) without the delivery of shares will again be available for grant. American’s salaries, wages and benefits expense for the years ended December 31, 2017 , 2016 and 2015 included $90 million , $102 million and $274 million , respectively, of share-based compensation costs. Of the 2015 amount, $198 million was related to awards granted to certain employees in connection with the Merger and recorded in special items, net on the accompanying consolidated statements of operations. During 2017 , 2016 and 2015 , AAG withheld approximately 1.1 million , 1.4 million and 7.0 million shares of AAG common stock, respectively, and paid approximately $51 million , $56 million and $306 million , respectively, in satisfaction of certain tax withholding obligations associated with employee equity awards. (a) Restricted Stock Unit Awards (RSUs) AAG has granted RSUs with service conditions (time vested primarily over three years) and performance conditions. The grant-date fair value of RSUs is equal to the market price of the underlying shares of common stock on the date of grant. For time vested awards, the expense is recognized on a straight-line basis over the vesting period for the entire award. For awards with performance conditions, the expense is recognized based on the expected achievement at each reporting period. Stock-settled RSUs are classified as equity awards as the vesting results in the issuance of shares of AAG common stock. Stock-settled RSU award activity for all plans for the years ended December 31, 2017 , 2016 and 2015 is as follows: Number of Shares Weighted Average Grant Date Fair Value (In thousands) Outstanding at December 31, 2014 21,342 $ 26.43 Granted 2,213 46.62 Vested and released (17,163 ) 25.20 Forfeited (785 ) 27.12 Outstanding at December 31, 2015 5,607 $ 38.08 Granted 2,655 41.34 Vested and released (2,754 ) 34.83 Forfeited (321 ) 40.15 Outstanding at December 31, 2016 5,187 $ 41.48 Granted 2,309 48.58 Vested and released (2,708 ) 39.63 Forfeited (464 ) 44.48 Outstanding at December 31, 2017 4,324 $ 46.94 As of December 31, 2017 , there was $121 million of unrecognized compensation cost related to stock-settled RSUs. These costs are expected to be recognized over a weighted average period of one year . The total fair value of stock-settled RSUs vested during the years ended December 31, 2017 , 2016 and 2015 was $123 million , $107 million and $750 million , respectively. (b) Stock Appreciation Rights (SARs) AAG assumed US Airways Group’s outstanding SARs in connection with the Merger using an exchange ratio of one to one. These SARs were granted with an exercise price equal to the underlying common stock’s fair value at the date of each grant, have service conditions, become exercisable over a three -year vesting period and expire if unexercised at the end of their term, which ranges from seven to ten years . During 2017 , 2016 and 2015 , 0.8 million , 1.7 million and 3.0 million SARs, respectively, were exercised at weighted average exercise prices of $15.71 , $14.49 and $12.09 , respectively, for a total intrinsic value of $27 million , $49 million and $102 million , respectively. As of December 31, 2017, AAG had 1.2 million SARs outstanding with an aggregate intrinsic value of $54 million and weighted average exercise price of $8.08 that expire between 2018 and 2020 if unexercised. (c) ASU 2016-09: Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting This ASU simplified the accounting for share-based payment award transactions including the financial statement presentation of excess tax benefits and deficiencies. American adopted this ASU during the second quarter of 2016, which resulted in the recognition of $418 million of previously unrecognized excess tax benefits in deferred tax assets and an increase to retained earnings on the consolidated balance sheet as of the beginning of 2016.

Valuation and Qualifying Accoun

Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2017
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation and Qualifying Accounts	Valuation and Qualifying Accounts (in millions) Balance at Beginning of Year Changes Charged to Statement of Operations Accounts Write-offs (Net of Recoveries) Sales, Retirements and Transfers Balance at End of Year Allowance for obsolescence of spare parts Year ended December 31, 2017 $ 765 $ 29 $ (4 ) $ (21 ) $ 769 Year ended December 31, 2016 728 37 (3 ) 3 765 Year ended December 31, 2015 673 50 (4 ) 9 728 Allowance for uncollectible accounts Year ended December 31, 2017 $ 36 $ 43 $ (55 ) $ — $ 24 Year ended December 31, 2016 41 47 (52 ) — 36 Year ended December 31, 2015 17 46 (22 ) — 41
American Airlines, Inc. [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation and Qualifying Accounts	Valuation and Qualifying Accounts (in millions) Balance at Beginning of Year Changes Charged to Statement of Operations Accounts Write-offs (Net of Recoveries) Sales, Retirements and Transfers Balance at End of Year Allowance for obsolescence of spare parts Year ended December 31, 2017 $ 720 $ 18 $ — $ (21 ) $ 717 Year ended December 31, 2016 689 28 — 3 720 Year ended December 31, 2015 638 42 — 9 689 Allowance for uncollectible accounts Year ended December 31, 2017 $ 35 $ 41 $ (55 ) $ — $ 21 Year ended December 31, 2016 37 47 (49 ) — 35 Year ended December 31, 2015 14 45 (22 ) — 37

Quarterly Financial Data (Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2017
Selected Quarterly Financial Information [Line Items]
Quarterly Financial Data (Unaudited)	Quarterly Financial Data (Unaudited) Unaudited summarized financial data by quarter for 2017 and 2016 (in millions, except share and per share amounts): First Quarter Second Quarter Third Quarter Fourth Quarter 2017 Operating revenues $ 9,624 $ 11,105 $ 10,878 $ 10,600 Operating expenses 9,023 9,570 9,646 9,910 Operating income 601 1,535 1,232 690 Net income 234 803 624 258 Earnings per share: Basic $ 0.46 $ 1.64 $ 1.29 $ 0.54 Diluted $ 0.46 $ 1.63 $ 1.28 $ 0.54 Shares used for computation (in thousands): Basic 503,902 490,818 484,772 477,165 Diluted 507,797 492,965 486,625 479,382 2016 Operating revenues $ 9,435 $ 10,363 $ 10,594 $ 9,789 Operating expenses 8,100 8,612 9,163 9,022 Operating income 1,335 1,751 1,431 767 Net income 700 950 737 289 Earnings per share: Basic $ 1.15 $ 1.69 $ 1.40 $ 0.56 Diluted $ 1.14 $ 1.68 $ 1.40 $ 0.56 Shares used for computation (in thousands): Basic 606,245 563,000 525,415 514,571 Diluted 611,488 566,040 528,510 518,358 Our fourth quarter 2017 results include $307 million of total net special items that principally included a $149 million charge for the $1,000 cash bonus and associated payroll taxes granted to our employees as of December 31, 2017 in recognition of the 2017 Tax Act, $81 million of Merger integration expenses, $58 million of fleet restructuring expenses, a $20 million net charge resulting from fair value adjustments to bankruptcy obligations and a $7 million special non-cash benefit to income tax expense to reflect the impact on our deferred tax assets and liabilities resulting from the 2017 Tax Act. Our fourth quarter 2016 results include $273 million of total net special items that principally included $121 million of Merger integration expenses, $104 million of fleet restructuring expenses and a $47 million net charge resulting from fair value adjustments to bankruptcy obligations.
American Airlines, Inc. [Member]
Selected Quarterly Financial Information [Line Items]
Quarterly Financial Data (Unaudited)	Quarterly Financial Data (Unaudited) Unaudited summarized financial data by quarter for 2017 and 2016 (in millions): First Quarter Second Quarter Third Quarter Fourth Quarter 2017 Operating revenues $ 9,621 $ 11,102 $ 10,875 $ 10,597 Operating expenses 9,017 9,575 9,650 9,921 Operating income 604 1,527 1,225 676 Net income 263 827 649 183 2016 Operating revenues $ 9,427 $ 10,360 $ 10,591 $ 9,786 Operating expenses 8,104 8,603 9,159 8,995 Operating income 1,323 1,757 1,432 791 Net income 710 972 758 341 American’s fourth quarter 2017 results include $384 million of total net special items that principally included a $123 million charge for the $1,000 cash bonus and associated payroll taxes granted to mainline employees as of December 31, 2017 in recognition of the 2017 Tax Act, $81 million of Merger integration expenses, $58 million of fleet restructuring expenses, a $20 million net charge resulting from fair value adjustments to bankruptcy obligations and a $93 million special non-cash charge to income tax expense to reflect the impact on American’s deferred tax assets and liabilities resulting from the 2017 Tax Act. American’s fourth quarter 2016 results include $273 million of total net special items that principally included $121 million of Merger integration expenses, $104 million of fleet restructuring expenses and a $47 million net charge resulting from fair value adjustments to bankruptcy obligations.

Subsequent Event

Subsequent Event	12 Months Ended
	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event Dividend Declaration In January 2018, we announced that our Board of Directors declared a $0.10 per share dividend for stockholders of record on February 6, 2018, and payable on February 20, 2018. Any future dividends that may be declared and paid from time to time will be subject to market and economic conditions, applicable legal requirements and other relevant factors. We are not obligated to continue a dividend for any fixed period, and payment of dividends may be suspended at any time at our discretion.

Transactions with Related Parti

Transactions with Related Parties	12 Months Ended
	Dec. 31, 2017
American Airlines, Inc. [Member]
Related Party Transaction [Line Items]
Transactions with Related Parties	Transactions with Related Parties The following represents the net receivables (payables) to related parties (in millions): December 31, 2017 2016 AAG (1) $ 10,968 $ 8,981 AAG’s wholly-owned subsidiaries (2) (2,146 ) (2,171 ) Total $ 8,822 $ 6,810 (1) The increase in American’s net related party receivable from AAG is primarily due to American providing the cash funding for AAG’s share repurchase and dividend programs. (2) The net payable to AAG’s wholly-owned subsidiaries consists primarily of amounts due under regional capacity purchase agreements with AAG’s wholly-owned regional airlines operating under the brand name of American Eagle. Pursuant to a capacity purchase agreement between American and AAG’s wholly-owned regional airlines operating as American Eagle, American purchases all of the capacity from these carriers and recognizes passenger revenue from flights operated by American Eagle. In 2017 , 2016 and 2015 , American recognized expense of approximately $1.7 billion , $1.5 billion and $1.2 billion , respectively, related to wholly-owned regional airline capacity purchase agreements.

Basis of Presentation and Sum27

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Basis of Presentation	(a) Basis of Presentation American Airlines Group Inc. (we, us, our and similar terms, or AAG), a Delaware corporation, is a holding company whose primary business activity is the operation of a major network air carrier, providing scheduled air transportation for passengers and cargo through its mainline operating subsidiary, American Airlines, Inc. (American) and its wholly-owned regional airline subsidiaries, Envoy Aviation Group Inc. (Envoy), Piedmont Airlines, Inc. (Piedmont) and PSA Airlines, Inc. (PSA) that operate under the brand American Eagle. On December 9, 2013, a subsidiary of AMR Corporation (AMR) merged with and into US Airways Group, Inc. (US Airways Group), a Delaware corporation, which survived as a wholly-owned subsidiary of AAG, and AAG emerged from Chapter 11 (the Merger). Upon closing of the Merger and emergence from Chapter 11, AMR changed its name to American Airlines Group Inc. On December 30, 2015, in order to simplify AAG’s internal corporate structure, US Airways Group merged with and into AAG, with AAG as the surviving corporation. Immediately thereafter, US Airways, Inc. (US Airways), a wholly-owned subsidiary of US Airways Group, merged with and into American, with American as the surviving corporation. All significant intercompany transactions have been eliminated. The preparation of financial statements in accordance with accounting principles generally accepted in the United States (GAAP) requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The most significant areas of judgment relate to passenger revenue recognition, impairment of goodwill, impairment of long-lived and intangible assets, the loyalty program, valuation allowance for deferred tax assets, as well as pension and retiree medical and other postretirement benefits.
Short-term Investments	(b) Short-term Investments Short-term investments are classified as available-for-sale and stated at fair value. Realized gains and losses are recorded in nonoperating expense on the consolidated statement of operations. Unrealized gains and losses are recorded in accumulated other comprehensive loss on the consolidated balance sheets.
Restricted Cash and Short-term Investments	(c) Restricted Cash and Short-term Investments We have restricted cash and short-term investments related primarily to collateral held to support workers’ compensation obligations.
Aircraft Fuel, Spare Parts, and Supplies, Net	(d) Aircraft Fuel, Spare Parts and Supplies, Net Aircraft fuel is recorded on a first-in, first-out basis. Spare parts and supplies are recorded at average costs less an allowance for obsolescence. These items are expensed when used.
Operating Property and Equipment	(e) Operating Property and Equipment Operating property and equipment is recorded at cost and depreciated or amortized to residual values over the asset’s estimated useful life or the lease term, whichever is less, using the straight-line method. Residual values for aircraft, engines and related rotable parts are generally 5% to 10% of original cost. Costs of major improvements that enhance the usefulness of the asset are capitalized and depreciated or amortized over the estimated useful life of the asset or the lease term, whichever is less. The estimated useful lives for the principal property and equipment classifications are as follows: Principal Property and Equipment Classification Estimated Useful Life Aircraft, engines and related rotable parts 20 – 30 years Buildings and improvements 5 – 30 years Furniture, fixtures and other equipment 3 – 10 years Capitalized software 5 – 10 years We assess impairment on operating property and equipment when events and circumstances indicate that the assets may be impaired. An asset or group of assets is considered impaired when the undiscounted cash flows estimated to be generated by the assets are less than the carrying amount of the assets and the net book value of the assets exceeds their estimated fair value. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount or fair value less the cost to sell.
Income Taxes	(f) Income Taxes Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are recorded net as noncurrent deferred income taxes. We provide a valuation allowance for our deferred tax assets when it is more likely than not that some portion, or all of our deferred tax assets, will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income. We consider all available positive and negative evidence and make certain assumptions in evaluating the realizability of our deferred tax assets. Many factors are considered that impact our assessment of future profitability, including conditions which are beyond our control, such as the health of the economy, the level and volatility of fuel prices and travel demand.
Goodwill	(g) Goodwill Goodwill represents the excess of the purchase price over the fair value of the net assets acquired and liabilities assumed. Goodwill is not amortized but assessed for impairment annually on October 1 st or more frequently if events or circumstances indicate that goodwill may be impaired. We have one consolidated reporting unit. Goodwill is assessed for impairment by initially performing a qualitative assessment and, if necessary, then comparing the fair value of the reporting unit to its carrying value, including goodwill. If the fair value of the reporting unit is less than the carrying value, a second step is performed to determine the implied fair value of goodwill. If the implied fair value of goodwill is lower than its carrying value, an impairment charge equal to the difference is recorded.
Other Intangibles, Net	(h) Other Intangibles, Net Intangible assets consist primarily of domestic airport slots, customer relationships, marketing agreements, international slots and route authorities, airport gate leasehold rights and tradenames. Finite-Lived Intangible Assets Finite-lived intangible assets are amortized over their respective estimated useful lives and reviewed for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable. The following table provides information relating to our amortizable intangible assets as of December 31, 2017 and 2016 (in millions): December 31, 2017 2016 Domestic airport slots $ 365 $ 365 Customer relationships 300 300 Marketing agreements 105 105 Tradenames 35 35 Airport gate leasehold rights 137 137 Accumulated amortization (622 ) (578 ) Total $ 320 $ 364 Certain domestic airport slots and airport gate leasehold rights are amortized on a straight-line basis over 25 years. The customer relationships and marketing agreements were identified as intangible assets subject to amortization and are amortized on a straight-line basis over approximately nine years and 30 years, respectively. Tradenames are fully amortized. We recorded amortization expense related to these intangible assets of $44 million , $76 million and $55 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. We expect to record annual amortization expense for these intangible assets as follows (in millions): 2018 $ 41 2019 41 2020 41 2021 41 2022 41 2023 and thereafter 115 Total $ 320 Indefinite-Lived Intangible Assets Indefinite-lived intangible assets include certain domestic airport slots at our hubs and international slots and route authorities. Indefinite-lived intangible assets are not amortized but instead are assessed for impairment annually on October 1 st or more frequently if events or circumstances indicate that the asset may be impaired. As of December 31, 2017 and 2016 , we had $1.9 billion and $1.8 billion , respectively, of indefinite-lived intangible assets on our consolidated balance sheets. Indefinite-lived intangible assets are assessed for impairment by initially performing a qualitative assessment to determine whether we believe it is more likely than not that an asset has been impaired. If we believe impairment has occurred, we then evaluate for impairment by comparing the estimated fair value of assets to the carrying value. An impairment charge is recognized if the asset’s estimated fair value is less than its carrying value. Based upon our annual assessment, there was no indefinite-lived intangible asset impairment in 2017 .
Loyalty Program	(i) Loyalty Program We currently operate the loyalty program, AAdvantage. This program awards mileage credits to passengers who fly on American, any one world airline or other partner airlines, or by using the services of other program participants, such as the Citi and Barclaycard US co-branded credit cards, hotels and car rental companies. Mileage credits can be redeemed for travel on American or other participating partner airlines. Through December 31, 2017, we used the incremental cost method to account for the portion of our loyalty program liability incurred when AAdvantage members earn mileage credits by flying on American, any one world airline or other partner airlines. We have an obligation to provide future travel when these mileage credits are redeemed and therefore have recorded a liability for mileage credits outstanding. The incremental cost liability includes all mileage credits, even mileage credits for members whose account balances have not yet reached the minimum level required to redeem an award. Mileage credits are subject to expiration. The liability for outstanding mileage credits is valued based on the estimated incremental cost of carrying one additional passenger. The estimated incremental cost primarily includes unit costs incurred for fuel, food and insurance as well as fees incurred when travel awards are redeemed on partner airlines. In calculating the liability, we estimate how many mileage credits will never be redeemed for travel and exclude those mileage credits from the estimate of the liability. Estimates are also made for the number of miles that will be used per award redemption and the number of travel awards that will be redeemed on partner airlines. These costs and estimates are based on our historical program experience as well as consideration of enacted program changes, as applicable. Changes in the liability resulting from members earning additional mileage credits or changes in estimates are recorded in the consolidated statements of operations as a part of passenger revenue. As of December 31, 2017 and 2016 , the liability for outstanding mileage credits accounted for under the incremental cost method was $677 million and $669 million , respectively, and is included on the consolidated balance sheets within loyalty program liability. We also sell loyalty program mileage credits to participating airline partners and non-airline business partners, such as the Citi and Barclaycard US co-branded credit cards. Sales of mileage credits to non-airline business partners is comprised of two components, transportation and marketing. We account for mileage sales under our agreements with non-airline business partners in accordance with ASU 2009-13, “Revenue Recognition (Topic 605) – Multiple-Deliverable Revenue Arrangements.” In accordance with ASU 2009-13, we allocate the consideration received from the sale of mileage credits based on the relative selling price of each product or service delivered. As a result of our co-branded credit card program agreements with Citi and Barclaycard US that we entered into in 2016, we identified the following revenue elements in these co-branded credit card agreements: the transportation component; and the use of the American brand including access to loyalty program member lists, advertising and other travel related benefits (collectively, the marketing component). The transportation component represents the estimated selling price of future travel awards and is determined using historical transaction information, including information related to customer redemption patterns. The transportation component is deferred based on its relative selling price and is amortized into passenger revenue on a straight-line basis over the period in which the mileage credits are expected to be redeemed for travel. As of December 31, 2017 and 2016 , we had $2.1 billion in deferred revenue from the sale of mileage credits recorded within loyalty program liability on our consolidated balance sheets. The services under the marketing component are provided periodically, but no less than monthly. Accordingly, the marketing component is considered earned and recognized in other revenues in the period of the mileage sale.
Revenue	(j) Revenue Passenger Revenue Passenger revenue is recognized when transportation is provided. Ticket sales for transportation that has not yet been provided are initially deferred and recorded as air traffic liability on the consolidated balance sheets. The air traffic liability represents tickets sold for future travel dates and estimated future refunds and exchanges of tickets sold for past travel dates. The balance in the air traffic liability fluctuates throughout the year based on seasonal travel patterns. Our air traffic liability was $4.0 billion and $3.9 billion as of December 31, 2017 and 2016 , respectively. The majority of tickets sold are nonrefundable. A small percentage of tickets, some of which are partially used tickets, expire unused. Due to complex pricing structures, refund and exchange policies, and interline agreements with other airlines, certain amounts are recognized in passenger revenue using estimates regarding both the timing of the revenue recognition and the amount of revenue to be recognized. These estimates are generally based on the analysis of our historical data. We and other airline industry participants have consistently applied this accounting method to estimate revenue from forfeited tickets at the date of travel. Estimated future refunds and exchanges included in the air traffic liability are routinely evaluated based on subsequent activity to validate the accuracy of our estimates. Any adjustments resulting from periodic evaluations of the estimated air traffic liability are included in passenger revenue during the period in which the evaluations are completed. Regional carriers provide scheduled air transportation under the brand name American Eagle. We classify revenues generated from transportation on these carriers as regional passenger revenues. Liabilities related to tickets sold by us for travel on these air carriers is also included in our air traffic liability and are subsequently recognized as revenue in the same manner as described above. Passenger Taxes and Fees Various taxes and fees assessed on the sale of tickets to end customers are collected by us as an agent and remitted to taxing authorities. These taxes and fees have been presented on a net basis in the accompanying consolidated statements of operations and recorded as a liability until remitted to the appropriate taxing authority. Cargo Revenue Cargo revenue is recognized when we provide the transportation. Other Revenue Other revenue includes revenue associated with marketing services provided to our business partners as part of our loyalty program, baggage fees, ticketing change fees, airport clubs and inflight services. The accounting and recognition for the loyalty program marketing services are discussed in Note 1(i) above. Baggage fees, ticketing change fees, airport clubs and inflight service revenues are recognized when we provide the service.
Maintenance, Materials and Repairs	(k) Maintenance, Materials and Repairs Maintenance and repair costs for owned and leased flight equipment are charged to operating expense as incurred, except costs incurred for maintenance and repair under flight hour maintenance contract agreements, which are accrued based on contractual terms when an obligation exists.
Selling Expenses	(l) Selling Expenses Selling expenses include credit card fees, commissions, computerized reservations systems fees and advertising. Advertising costs are expensed as incurred.
Share-based Compensation	(m) Share-based Compensation We account for our share-based compensation expense based on the fair value of the stock award at the time of grant, which is recognized ratably over the vesting period of the stock award. Certain awards have performance conditions that must be achieved prior to vesting and are expensed based on the expected achievement at each reporting period. The fair value of stock appreciation rights is estimated using a Black-Scholes option pricing model. The fair value of restricted stock units is based on the market price of the underlying shares of common stock on the date of grant. See Note 14 for further discussion of share-based compensation.
Deferred Gains and Credits, Net	(n) Deferred Gains and Credits, Net Included within deferred gains and credits, net are amounts deferred and amortized into future periods associated with the adjustment of leases to fair value in connection with the application of acquisition accounting, deferred gains on the sale-leaseback of aircraft and certain vendor incentives. We periodically receive vendor incentives in connection with acquisition of aircraft and engines. These credits are deferred until aircraft and engines are delivered and then applied as a reduction to the cost of the related equipment.
Foreign Currency Gains and Losses	(o) Foreign Currency Gains and Losses Foreign currency gains and losses are recorded as part of other nonoperating expense, net in our consolidated statements of operations.
Other Operating Expenses	(p) Other Operating Expenses Other operating expenses includes costs associated with ground and cargo handling, crew travel, aircraft food and catering, passenger accommodation, airport security, international navigation fees and certain general and administrative expenses.
Regional Expenses	(q) Regional Expenses Expenses associated with American Eagle operations are classified as regional expenses on the consolidated statements of operations.
Recent Accounting Pronouncements	(r) Recent Accounting Pronouncements Standards Effective for 2018 Reporting Periods Effective January 1, 2018, we are adopting the accounting pronouncements described below. The adoption and related required disclosures will be reported in our first quarter 2018 Quarterly Report on Form 10-Q. ASU 2014-09: Revenue from Contracts with Customers (Topic 606) (the New Revenue Standard) The New Revenue Standard applies to all companies that enter into contracts with customers to transfer goods or services. We are adopting the New Revenue Standard using the full retrospective method, which results in the recast of each prior reporting period presented. The adoption of the New Revenue Standard will impact our accounting for outstanding mileage credits earned through travel by AAdvantage loyalty program members. There is no change in accounting for sales of mileage credits to co-branded card or other partners as those are currently reported in accordance with the New Revenue Standard. Through December 31, 2017, we used the incremental cost method to account for the portion of our loyalty program liability related to mileage credits earned through travel, which were valued based on the estimated incremental cost of carrying one additional passenger (see (i) Loyalty Program above). The New Revenue Standard requires us to change our policy to the deferred revenue method and apply a relative selling price approach whereby a portion of each passenger ticket sale attributable to mileage credits earned is deferred and recognized in passenger revenue upon future mileage redemption. The value of the earned mileage credits is materially greater under the deferred revenue method than the value attributed to these mileage credits under the incremental cost method. The New Revenue Standard will also require certain reclassifications, principally the reclassification of certain ancillary revenues previously classified and reported as other revenue to passenger revenue and as applicable to cargo revenue. Additionally, the New Revenue Standard requires a gross presentation on the face of our statement of operations for certain revenues and expenses that had previously been presented on a net basis. See recast 2017 statement of operations and balance sheet data presented below for the expected effects of adoption. ASU 2017-07: Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (the New Retirement Standard) The New Retirement Standard requires all components of our net periodic benefit cost (income), with the exception of service cost, previously reported within operating expenses as salaries, wages and benefits, to be reclassified and reported within nonoperating income (expense). The New Retirement Standard is required to be applied retrospectively, which results in the recast of each prior reporting period presented. The adoption of the New Retirement Standard has no impact on pre-tax income or net income reported. See recast 2017 statement of operations data presented below for the expected effects of adoption. ASU 2016-01: Financial Instruments - Overall (Subtopic 825-10) This ASU makes several modifications to Subtopic 825-10, including the elimination of the available-for-sale classification of equity investments, and it requires equity investments with readily determinable fair values to be measured at fair value with changes in fair value recognized in net income. This standard is applied prospectively as of the beginning of the year of adoption. The adoption of this standard is not expected to have a material impact on our consolidated financial statements. ASU 2016-18: Statement of Cash Flows (Topic 230): Restricted Cash This ASU requires that the change in total cash, cash at beginning of period and cash at end of period on the statement of cash flows include restricted cash and restricted cash equivalents and also requires companies who report cash and restricted cash separately on the balance sheet to reconcile those amounts to the statement of cash flows. This standard is required to be applied retrospectively, which results in the recast of each prior reporting period statement of cash flows presented. The adoption of this standard is not expected to have a material impact on our consolidated financial statements. Impacts to 2017 Results The expected effects of adoption of the New Revenue Standard and New Retirement Standard to our statement of operations for the twelve months ended December 31, 2017 are as follows: New Revenue Standard New Retirement Standard As Reported Deferred Revenue Method Reclassifications Reclassifications As Recast Operating revenues: Passenger $ 36,133 $ 311 $ 2,687 $ — $ 39,131 Cargo 800 — 90 — 890 Other 5,274 — (2,673 ) — 2,601 Total operating revenues 42,207 311 104 — 42,622 Total operating expenses 38,149 — 104 138 38,391 Operating income 4,058 311 — (138 ) 4,231 Total nonoperating expense, net (974 ) — — 138 (836 ) Income before income taxes 3,084 311 — — 3,395 Income tax provision (1) 1,165 948 — — 2,113 Net income $ 1,919 $ (637 ) $ — $ — $ 1,282 Diluted earnings per common share $ 3.90 $ 2.61 (1) The adjustment to the 2017 income tax provision includes an $830 million special charge to reduce our deferred tax asset associated with loyalty program liabilities as a result of H.R. 1, the 2017 Tax Cuts and Jobs Act (the 2017 Tax Act), enacted in December 2017 that reduced the federal corporate income tax rate from 35% to 21% . The expected effects of adoption of the New Revenue Standard to our December 31, 2017 balance sheet are as follows: As Reported New Revenue Standard As Recast Deferred tax asset $ 427 $ 1,389 $ 1,816 Air traffic liability 3,978 64 4,042 Current loyalty program liability 2,791 384 3,175 Noncurrent loyalty program liability — 5,647 5,647 Total stockholders’ equity (deficit) 3,926 (4,706 ) (780 ) Standards Effective for 2019 Reporting Periods ASU 2016-02: Leases (Topic 842) (the New Lease Standard) The New Lease Standard requires lessees to recognize a lease liability and a right-of-use asset on the balance sheet and aligns many of the underlying principles of the new lessor model with those in the New Revenue Standard. The New Lease Standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. We expect we will adopt the New Lease Standard effective January 1, 2019. Entities are required to adopt the New Lease Standard using a modified retrospective approach, which results in the recast of each prior reporting period presented, for all leases existing at or commencing after the date of initial application with an option to use certain practical expedients. We are currently evaluating how the adoption of the New Lease Standard will impact our consolidated financial statements. Interpretations are on-going and could have a material impact on our implementation. Currently, we expect that the adoption of the New Lease Standard will have a material impact on our consolidated balance sheet due to the recognition of right-of-use assets and lease liabilities principally for certain leases currently accounted for as operating leases.
American Airlines, Inc. [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Basis of Presentation	(a) Basis of Presentation American Airlines, Inc. (American) is a Delaware corporation whose primary business activity is the operation of a major network air carrier. American is the principal wholly-owned subsidiary of American Airlines Group Inc. (AAG), which owns all of American’s outstanding common stock, par value $1.00 per share. On December 9, 2013, a subsidiary of AMR Corporation (AMR) merged with and into US Airways Group, Inc. (US Airways Group), a Delaware corporation, which survived as a wholly-owned subsidiary of AAG, and AAG emerged from Chapter 11 (the Merger). Upon closing of the Merger and emergence from Chapter 11, AMR changed its name to American Airlines Group Inc. On December 30, 2015, in order to simplify AAG’s internal corporate structure, US Airways, Inc. (US Airways), a wholly-owned subsidiary of US Airways Group, merged with and into American, with American as the surviving corporation. All significant intercompany transactions have been eliminated. The preparation of financial statements in accordance with accounting principles generally accepted in the United States (GAAP) requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities, revenues and expenses, and the disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The most significant areas of judgment relate to passenger revenue recognition, impairment of goodwill, impairment of long-lived and intangible assets, the loyalty program, valuation allowance for deferred tax assets, as well as pension and retiree medical and other postretirement benefits.
Short-term Investments	(b) Short-term Investments Short-term investments are classified as available-for-sale and stated at fair value. Realized gains and losses are recorded in nonoperating expense on the consolidated statement of operations. Unrealized gains and losses are recorded in accumulated other comprehensive loss on the consolidated balance sheets.
Restricted Cash and Short-term Investments	(c) Restricted Cash and Short-term Investments American has restricted cash and short-term investments related primarily to collateral held to support workers’ compensation obligations.
Aircraft Fuel, Spare Parts, and Supplies, Net	(d) Aircraft Fuel, Spare Parts and Supplies, Net Aircraft fuel is recorded on a first-in, first-out basis. Spare parts and supplies are recorded at average costs less an allowance for obsolescence. These items are expensed when used.
Operating Property and Equipment	(e) Operating Property and Equipment Operating property and equipment is recorded at cost and depreciated or amortized to residual values over the asset’s estimated useful life or the lease term, whichever is less, using the straight-line method. Residual values for aircraft, engines and related rotable parts are generally 5% to 10% of original cost. Costs of major improvements that enhance the usefulness of the asset are capitalized and depreciated or amortized over the estimated useful life of the asset or the lease term, whichever is less. The estimated useful lives for the principal property and equipment classifications are as follows: Principal Property and Equipment Classification Estimated Useful Life Aircraft, engines and related rotable parts 20 – 30 years Buildings and improvements 5 – 30 years Furniture, fixtures and other equipment 3 – 10 years Capitalized software 5 – 10 years American assesses impairment on operating property and equipment when events and circumstances indicate that the assets may be impaired. An asset or group of assets is considered impaired when the undiscounted cash flows estimated to be generated by the assets are less than the carrying amount of the assets and the net book value of the assets exceeds their estimated fair value. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds the fair value of the assets. Assets to be disposed of are reported at the lower of the carrying amount or fair value less the cost to sell.
Income Taxes	(f) Income Taxes Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are recorded net as noncurrent deferred income taxes. American provides a valuation allowance for its deferred tax assets when it is more likely than not that some portion, or all of its deferred tax assets, will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income. American considers all available positive and negative evidence and makes certain assumptions in evaluating the realizability of its deferred tax assets. Many factors are considered that impact American’s assessment of future profitability, including conditions which are beyond American’s control, such as the health of the economy, the level and volatility of fuel prices and travel demand.
Goodwill	(g) Goodwill Goodwill represents the excess of the purchase price over the fair value of the net assets acquired and liabilities assumed. Goodwill is not amortized but assessed for impairment annually on October 1 st or more frequently if events or circumstances indicate that goodwill may be impaired. American has one consolidated reporting unit. Goodwill is assessed for impairment by initially performing a qualitative assessment and, if necessary, then comparing the fair value of the reporting unit to its carrying value, including goodwill. If the fair value of the reporting unit is less than the carrying value, a second step is performed to determine the implied fair value of goodwill. If the implied fair value of goodwill is lower than its carrying value, an impairment charge equal to the difference is recorded. Based upon American’s annual assessment, there was no goodwill impairment in 2017 . The carrying value of the goodwill on American’s consolidated balance sheets was $4.1 billion as of December 31, 2017 and 2016 .
Other Intangibles, Net	(h) Other Intangibles, Net Intangible assets consist primarily of domestic airport slots, customer relationships, marketing agreements, international slots and route authorities, airport gate leasehold rights and tradenames. Finite-Lived Intangible Assets Finite-lived intangible assets are amortized over their respective estimated useful lives and reviewed for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable. The following table provides information relating to American’s amortizable intangible assets as of December 31, 2017 and 2016 (in millions): December 31, 2017 2016 Domestic airport slots $ 365 $ 365 Customer relationships 300 300 Marketing agreements 105 105 Tradenames 35 35 Airport gate leasehold rights 137 137 Accumulated amortization (622 ) (578 ) Total $ 320 $ 364 Certain domestic airport slots and airport gate leasehold rights are amortized on a straight-line basis over 25 years . The customer relationships and marketing agreements were identified as intangible assets subject to amortization and are amortized on a straight-line basis over approximately nine years and 30 years , respectively. Tradenames are fully amortized. American recorded amortization expense related to these intangible assets of $44 million , $76 million and $55 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. American expects to record annual amortization expense for these intangible assets as follows (in millions): 2018 $ 41 2019 41 2020 41 2021 41 2022 41 2023 and thereafter 115 Total $ 320 Indefinite-Lived Intangible Assets Indefinite-lived intangible assets include certain domestic airport slots at American’s hubs and international slots and route authorities. Indefinite-lived intangible assets are not amortized but instead are assessed for impairment annually on October 1 st or more frequently if events or circumstances indicate that the asset may be impaired. As of December 31, 2017 and 2016 , American had $1.9 billion and $1.8 billion , respectively, of indefinite-lived intangible assets on its consolidated balance sheets. Indefinite-lived intangible assets are assessed for impairment by initially performing a qualitative assessment to determine whether American believes it is more likely than not that an asset has been impaired. If American believes impairment has occurred, American then evaluates for impairment by comparing the estimated fair value of assets to the carrying value. An impairment charge is recognized if the asset’s estimated fair value is less than its carrying value. Based upon American’s annual assessment, there was no indefinite-lived intangible asset impairment in 2017 .
Loyalty Program	(i) Loyalty Program American currently operates the loyalty program, AAdvantage. This program awards mileage credits to passengers who fly on American, any one world airline or other partner airlines, or by using the services of other program participants, such as the Citi and Barclaycard US co-branded credit cards, hotels and car rental companies. Mileage credits can be redeemed for travel on American or other participating partner airlines. Through December 31, 2017, American used the incremental cost method to account for the portion of its loyalty program liability incurred when AAdvantage members earn mileage credits by flying on American, any one world airline or other partner airlines. American has an obligation to provide future travel when these mileage credits are redeemed and therefore have recorded a liability for mileage credits outstanding. The incremental cost liability includes all mileage credits, even mileage credits for members whose account balances have not yet reached the minimum level required to redeem an award. Mileage credits are subject to expiration. The liability for outstanding mileage credits is valued based on the estimated incremental cost of carrying one additional passenger. The estimated incremental cost primarily includes unit costs incurred for fuel, food and insurance as well as fees incurred when travel awards are redeemed on partner airlines. In calculating the liability, American estimates how many mileage credits will never be redeemed for travel and excludes those mileage credits from the estimate of the liability. Estimates are also made for the number of miles that will be used per award redemption and the number of travel awards that will be redeemed on partner airlines. These costs and estimates are based on American’s historical program experience as well as consideration of enacted program changes, as applicable. Changes in the liability resulting from members earning additional mileage credits or changes in estimates are recorded in the consolidated statements of operations as a part of passenger revenue. As of December 31, 2017 and 2016 , the liability for outstanding mileage credits accounted for under the incremental cost method was $677 million and $669 million , respectively, and is included on the consolidated balance sheets within loyalty program liability. American also sells loyalty program mileage credits to participating airline partners and non-airline business partners, such as the Citi and Barclaycard US co-branded credit cards. Sales of mileage credits to non-airline business partners is comprised of two components, transportation and marketing. American accounts for mileage sales under its agreements with non-airline business partners in accordance with ASU 2009-13, “Revenue Recognition (Topic 605) — Multiple-Deliverable Revenue Arrangements.” In accordance with ASU 2009-13, American allocates the consideration received from the sale of mileage credits based on the relative selling price of each product or service delivered. As a result of American’s co-branded credit card program agreements with Citi and Barclaycard US that it entered into in 2016, American identified the following revenue elements in these co-branded credit card agreements: the transportation component; and the use of the American brand including access to loyalty program member lists, advertising and other travel related benefits (collectively, the marketing component). The transportation component represents the estimated selling price of future travel awards and is determined using historical transaction information, including information related to customer redemption patterns. The transportation component is deferred based on its relative selling price and is amortized into passenger revenue on a straight-line basis over the period in which the mileage credits are expected to be redeemed for travel. As of December 31, 2017 and 2016 , American had $2.1 billion in deferred revenue from the sale of mileage credits recorded within loyalty program liability on its consolidated balance sheets. The services under the marketing component are provided periodically, but no less than monthly. Accordingly, the marketing component is considered earned and recognized in other revenues in the period of the mileage sale. For the years ended December 31, 2017 , 2016 and 2015 , the marketing component of mileage sales and other marketing related payments included in other revenues was approximately $2.2 billion , $1.9 billion and $1.7 billion , respectively.
Revenue	(j) Revenue Passenger Revenue Passenger revenue is recognized when transportation is provided. Ticket sales for transportation that has not yet been provided are initially deferred and recorded as air traffic liability on the consolidated balance sheets. The air traffic liability represents tickets sold for future travel dates and estimated future refunds and exchanges of tickets sold for past travel dates. The balance in the air traffic liability fluctuates throughout the year based on seasonal travel patterns. American’s air traffic liability was $4.0 billion and $3.9 billion as of December 31, 2017 and 2016 , respectively. The majority of tickets sold are nonrefundable. A small percentage of tickets, some of which are partially used tickets, expire unused. Due to complex pricing structures, refund and exchange policies, and interline agreements with other airlines, certain amounts are recognized in passenger revenue using estimates regarding both the timing of the revenue recognition and the amount of revenue to be recognized. These estimates are generally based on the analysis of American’s historical data. American and other airline industry participants have consistently applied this accounting method to estimate revenue from forfeited tickets at the date of travel. Estimated future refunds and exchanges included in the air traffic liability are routinely evaluated based on subsequent activity to validate the accuracy of American’s estimates. Any adjustments resulting from periodic evaluations of the estimated air traffic liability are included in passenger revenue during the period in which the evaluations are completed. Regional carriers provide scheduled air transportation under the brand name American Eagle. American classifies revenues generated from transportation on these carriers as regional passenger revenues. Liabilities related to tickets sold by American for travel on these air carriers are also included in American’s air traffic liability and are subsequently recognized as revenue in the same manner as described above. Passenger Taxes and Fees Various taxes and fees assessed on the sale of tickets to end customers are collected by American as an agent and remitted to taxing authorities. These taxes and fees have been presented on a net basis in the accompanying consolidated statements of operations and recorded as a liability until remitted to the appropriate taxing authority. Cargo Revenue Cargo revenue is recognized when American provides the transportation. Other Revenue Other revenue includes revenue associated with marketing services provided to American’s business partners as part of its loyalty program, baggage fees, ticketing change fees, airport clubs and inflight services. The accounting and recognition for the loyalty program marketing services are discussed in Note 1(i) above. Baggage fees, ticketing change fees, airport clubs and inflight service revenues are recognized when American provides the service.
Maintenance, Materials and Repairs	(k) Maintenance, Materials and Repairs Maintenance and repair costs for owned and leased flight equipment are charged to operating expense as incurred, except costs incurred for maintenance and repair under flight hour maintenance contract agreements, which are accrued based on contractual terms when an obligation exists.
Selling Expenses	(l) Selling Expenses Selling expenses include credit card fees, commissions, computerized reservations systems fees and advertising. Advertising costs are expensed as incurred.
Share-based Compensation	(m) Share-based Compensation American accounts for its share-based compensation expense based on the fair value of the stock award at the time of grant, which is recognized ratably over the vesting period of the stock award. Certain awards have performance conditions that must be achieved prior to vesting and are expensed based on the expected achievement at each reporting period. The fair value of stock appreciation rights is estimated using a Black-Scholes option pricing model. The fair value of restricted stock units is based on the market price of the underlying shares of common stock on the date of grant. See Note 12 for further discussion of share-based compensation.
Deferred Gains and Credits, Net	(n) Deferred Gains and Credits, Net Included within deferred gains and credits, net are amounts deferred and amortized into future periods associated with the adjustment of leases to fair value in connection with the application of acquisition accounting, deferred gains on the sale-leaseback of aircraft and certain vendor incentives. American periodically receives vendor incentives in connection with acquisition of aircraft and engines. These credits are deferred until aircraft and engines are delivered and then applied as a reduction to the cost of the related equipment.
Foreign Currency Gains and Losses	(o) Foreign Currency Gains and Losses Foreign currency gains and losses are recorded as part of other nonoperating expense, net in American’s consolidated statements of operations.
Other Operating Expenses	(p) Other Operating Expenses Other operating expenses includes costs associated with ground and cargo handling, crew travel, aircraft food and catering, passenger accommodation, airport security, international navigation fees and certain general and administrative expenses.
Regional Expenses	(q) Regional Expenses Expenses associated with American Eagle operations are classified as regional expenses on the consolidated statements of operations. Regional expenses consist of the following (in millions): Year Ended December 31, 2017 2016 2015 Aircraft fuel and related taxes $ 1,382 $ 1,109 $ 1,230 Salaries, wages and benefits 356 327 276 Capacity purchases from third-party regional carriers (1) 3,283 3,186 3,137 Maintenance, materials and repairs 7 4 4 Other rent and landing fees 602 487 434 Aircraft rent 27 28 28 Selling expenses 361 347 333 Depreciation and amortization 262 237 197 Special items, net 3 13 18 Other 289 271 295 Total regional expenses $ 6,572 $ 6,009 $ 5,952 (1) For the years ended December 31, 2017 , 2016 and 2015 , the component of capacity purchase expenses representing the lease of aircraft for accounting purposes was approximately $437 million , $405 million and $492 million , respectively.
Recent Accounting Pronouncements	(r) Recent Accounting Pronouncements Standards Effective for 2018 Reporting Periods Effective January 1, 2018, American is adopting the accounting pronouncements described below. The adoption and related required disclosures will be reported in American’s first quarter 2018 Quarterly Report on Form 10-Q. ASU 2014-09: Revenue from Contracts with Customers (Topic 606) (the New Revenue Standard) The New Revenue Standard applies to all companies that enter into contracts with customers to transfer goods or services. American is adopting the New Revenue Standard using the full retrospective method, which results in the recast of each prior reporting period presented. The adoption of the New Revenue Standard will impact American’s accounting for outstanding mileage credits earned through travel by AAdvantage loyalty program members. There is no change in accounting for sales of mileage credits to co-branded card or other partners as those are currently reported in accordance with the New Revenue Standard. Through December 31, 2017, American used the incremental cost method to account for the portion of its loyalty program liability related to mileage credits earned through travel, which were valued based on the estimated incremental cost of carrying one additional passenger (see (i) Loyalty Program above). The New Revenue Standard requires American to change its policy to the deferred revenue method and apply a relative selling price approach whereby a portion of each passenger ticket sale attributable to mileage credits earned is deferred and recognized in passenger revenue upon future mileage redemption. The value of the earned mileage credits is materially greater under the deferred revenue method than the value attributed to these mileage credits under the incremental cost method. The New Revenue Standard will also require certain reclassifications, principally the reclassification of certain ancillary revenues previously classified and reported as other revenue to passenger revenue and as applicable to cargo revenue. Additionally, the New Revenue Standard requires a gross presentation on the face of American’s statement of operations for certain revenues and expenses that had previously been presented on a net basis. See recast 2017 statement of operations and balance sheet data presented below for the expected effects of adoption. ASU 2017-07: Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost (the New Retirement Standard) The New Retirement Standard requires all components of American’s net periodic benefit cost (income), with the exception of service cost, previously reported within operating expenses as salaries, wages and benefits, to be reclassified and reported within nonoperating income (expense). The New Retirement Standard is required to be applied retrospectively, which results in the recast of each prior reporting period presented. The adoption of the New Retirement Standard has no impact on pre-tax income or net income reported. See recast 2017 statement of operations data presented below for the expected effects of adoption. ASU 2016-01: Financial Instruments - Overall (Subtopic 825-10) This ASU makes several modifications to Subtopic 825-10, including the elimination of the available-for-sale classification of equity investments, and it requires equity investments with readily determinable fair values to be measured at fair value with changes in fair value recognized in net income. This standard is applied prospectively as of the beginning of the year of adoption. The adoption of this standard is not expected to have a material impact on American’s consolidated financial statements. ASU 2016-18: Statement of Cash Flows (Topic 230): Restricted Cash This ASU requires that the change in total cash, cash at beginning of period and cash at end of period on the statement of cash flows include restricted cash and restricted cash equivalents and also requires companies who report cash and restricted cash separately on the balance sheet to reconcile those amounts to the statement of cash flows. This standard is required to be applied retrospectively, which results in the recast of each prior reporting period statement of cash flows presented. The adoption of this standard is not expected to have a material impact on American’s consolidated financial statements. Impacts to 2017 Results The expected effects of adoption of the New Revenue Standard and New Retirement Standard to American’s statement of operations for the twelve months ended December 31, 2017 are as follows: New Revenue Standard New Retirement Standard As Reported Deferred Revenue Method Reclassifications Reclassifications As Recast Operating revenues: Passenger $ 36,133 $ 311 $ 2,687 $ — $ 39,131 Cargo 800 — 90 — 890 Other 5,262 — (2,673 ) — 2,589 Total operating revenues 42,195 311 104 — 42,610 Total operating expenses 38,163 — 104 138 38,405 Operating income 4,032 311 — (138 ) 4,205 Total nonoperating expense, net (788 ) — — 138 (650 ) Income before income taxes 3,244 311 — — 3,555 Income tax provision (1) 1,322 948 — — 2,270 Net income $ 1,922 $ (637 ) $ — $ — $ 1,285 (1) The adjustment to the 2017 income tax provision includes an $830 million special charge to reduce American’s deferred tax asset associated with loyalty program liabilities as a result of H.R. 1, the 2017 Tax Cuts and Jobs Act (the 2017 Tax Act), enacted in December 2017 that reduced the federal corporate income tax rate from 35% to 21% . The expected effects of adoption of the New Revenue Standard to American’s December 31, 2017 balance sheet are as follows: As Reported New Revenue Standard As Recast Deferred tax asset $ 682 $ 1,389 $ 2,071 Air traffic liability 3,978 64 4,042 Current loyalty program liability 2,791 384 3,175 Noncurrent loyalty program liability — 5,647 5,647 Total stockholder’s equity (deficit) 14,594 (4,706 ) 9,888 Standards Effective for 2019 Reporting Periods ASU 2016-02: Leases (Topic 842) (the New Lease Standard) The New Lease Standard requires lessees to recognize a lease liability and a right-of-use asset on the balance sheet and aligns many of the underlying principles of the new lessor model with those in the New Revenue Standard. The New Lease Standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. American expects it will adopt the New Lease Standard effective January 1, 2019. Entities are required to adopt the New Lease Standard using a modified retrospective approach, which results in the recast of each prior reporting period presented, for all leases existing at or commencing after the date of initial application with an option to use certain practical expedients. American is currently evaluating how the adoption of the New Lease Standard will impact its consolidated financial statements. Interpretations are on-going and could have a material impact on its implementation. Currently, American expects that the adoption of the New Lease Standard will have a material impact on its consolidated balance sheet due to the recognition of right-of-use assets and lease liabilities principally for certain leases currently accounted for as operating leases.

Basis of Presentation and Sum28

Basis of Presentation and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2017
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Schedule of Estimated Useful Lives of Principal Property and Equipment	The estimated useful lives for the principal property and equipment classifications are as follows: Principal Property and Equipment Classification Estimated Useful Life Aircraft, engines and related rotable parts 20 – 30 years Buildings and improvements 5 – 30 years Furniture, fixtures and other equipment 3 – 10 years Capitalized software 5 – 10 years
Schedule of Amortizable Intangible Assets	The following table provides information relating to our amortizable intangible assets as of December 31, 2017 and 2016 (in millions): December 31, 2017 2016 Domestic airport slots $ 365 $ 365 Customer relationships 300 300 Marketing agreements 105 105 Tradenames 35 35 Airport gate leasehold rights 137 137 Accumulated amortization (622 ) (578 ) Total $ 320 $ 364
Schedule of Future Amortization Expense	We expect to record annual amortization expense for these intangible assets as follows (in millions): 2018 $ 41 2019 41 2020 41 2021 41 2022 41 2023 and thereafter 115 Total $ 320
Components of Regional Expenses	Regional expenses consist of the following (in millions): Year Ended December 31, 2017 2016 2015 Aircraft fuel and related taxes $ 1,382 $ 1,109 $ 1,230 Salaries, wages and benefits 1,452 1,333 1,187 Capacity purchases from third-party regional carriers (1) 1,581 1,538 1,651 Maintenance, materials and repairs 281 345 323 Other rent and landing fees 625 564 504 Aircraft rent 35 36 34 Selling expenses 361 347 333 Depreciation and amortization 315 301 252 Special items, net 22 14 29 Other 492 457 440 Total regional expenses $ 6,546 $ 6,044 $ 5,983 (1) For the years ended December 31, 2017 , 2016 and 2015 , the component of capacity purchase expenses representing the lease of aircraft for accounting purposes was approximately $437 million , $405 million and $492 million , respectively.
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The expected effects of adoption of the New Revenue Standard and New Retirement Standard to our statement of operations for the twelve months ended December 31, 2017 are as follows: New Revenue Standard New Retirement Standard As Reported Deferred Revenue Method Reclassifications Reclassifications As Recast Operating revenues: Passenger $ 36,133 $ 311 $ 2,687 $ — $ 39,131 Cargo 800 — 90 — 890 Other 5,274 — (2,673 ) — 2,601 Total operating revenues 42,207 311 104 — 42,622 Total operating expenses 38,149 — 104 138 38,391 Operating income 4,058 311 — (138 ) 4,231 Total nonoperating expense, net (974 ) — — 138 (836 ) Income before income taxes 3,084 311 — — 3,395 Income tax provision (1) 1,165 948 — — 2,113 Net income $ 1,919 $ (637 ) $ — $ — $ 1,282 Diluted earnings per common share $ 3.90 $ 2.61 (1) The adjustment to the 2017 income tax provision includes an $830 million special charge to reduce our deferred tax asset associated with loyalty program liabilities as a result of H.R. 1, the 2017 Tax Cuts and Jobs Act (the 2017 Tax Act), enacted in December 2017 that reduced the federal corporate income tax rate from 35% to 21% . The expected effects of adoption of the New Revenue Standard to our December 31, 2017 balance sheet are as follows: As Reported New Revenue Standard As Recast Deferred tax asset $ 427 $ 1,389 $ 1,816 Air traffic liability 3,978 64 4,042 Current loyalty program liability 2,791 384 3,175 Noncurrent loyalty program liability — 5,647 5,647 Total stockholders’ equity (deficit) 3,926 (4,706 ) (780 )
American Airlines, Inc. [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Schedule of Estimated Useful Lives of Principal Property and Equipment	The estimated useful lives for the principal property and equipment classifications are as follows: Principal Property and Equipment Classification Estimated Useful Life Aircraft, engines and related rotable parts 20 – 30 years Buildings and improvements 5 – 30 years Furniture, fixtures and other equipment 3 – 10 years Capitalized software 5 – 10 years
Schedule of Amortizable Intangible Assets	The following table provides information relating to American’s amortizable intangible assets as of December 31, 2017 and 2016 (in millions): December 31, 2017 2016 Domestic airport slots $ 365 $ 365 Customer relationships 300 300 Marketing agreements 105 105 Tradenames 35 35 Airport gate leasehold rights 137 137 Accumulated amortization (622 ) (578 ) Total $ 320 $ 364
Schedule of Future Amortization Expense	American expects to record annual amortization expense for these intangible assets as follows (in millions): 2018 $ 41 2019 41 2020 41 2021 41 2022 41 2023 and thereafter 115 Total $ 320
Components of Regional Expenses	Regional expenses consist of the following (in millions): Year Ended December 31, 2017 2016 2015 Aircraft fuel and related taxes $ 1,382 $ 1,109 $ 1,230 Salaries, wages and benefits 356 327 276 Capacity purchases from third-party regional carriers (1) 3,283 3,186 3,137 Maintenance, materials and repairs 7 4 4 Other rent and landing fees 602 487 434 Aircraft rent 27 28 28 Selling expenses 361 347 333 Depreciation and amortization 262 237 197 Special items, net 3 13 18 Other 289 271 295 Total regional expenses $ 6,572 $ 6,009 $ 5,952 (1) For the years ended December 31, 2017 , 2016 and 2015 , the component of capacity purchase expenses representing the lease of aircraft for accounting purposes was approximately $437 million , $405 million and $492 million , respectively.
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The expected effects of adoption of the New Revenue Standard and New Retirement Standard to American’s statement of operations for the twelve months ended December 31, 2017 are as follows: New Revenue Standard New Retirement Standard As Reported Deferred Revenue Method Reclassifications Reclassifications As Recast Operating revenues: Passenger $ 36,133 $ 311 $ 2,687 $ — $ 39,131 Cargo 800 — 90 — 890 Other 5,262 — (2,673 ) — 2,589 Total operating revenues 42,195 311 104 — 42,610 Total operating expenses 38,163 — 104 138 38,405 Operating income 4,032 311 — (138 ) 4,205 Total nonoperating expense, net (788 ) — — 138 (650 ) Income before income taxes 3,244 311 — — 3,555 Income tax provision (1) 1,322 948 — — 2,270 Net income $ 1,922 $ (637 ) $ — $ — $ 1,285 (1) The adjustment to the 2017 income tax provision includes an $830 million special charge to reduce American’s deferred tax asset associated with loyalty program liabilities as a result of H.R. 1, the 2017 Tax Cuts and Jobs Act (the 2017 Tax Act), enacted in December 2017 that reduced the federal corporate income tax rate from 35% to 21% . The expected effects of adoption of the New Revenue Standard to American’s December 31, 2017 balance sheet are as follows: As Reported New Revenue Standard As Recast Deferred tax asset $ 682 $ 1,389 $ 2,071 Air traffic liability 3,978 64 4,042 Current loyalty program liability 2,791 384 3,175 Noncurrent loyalty program liability — 5,647 5,647 Total stockholder’s equity (deficit) 14,594 (4,706 ) 9,888

Special Items, Net (Tables)

Special Items, Net (Tables)	12 Months Ended
	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Components of Special Items, Net Included in Consolidated Statements of Operations	Special items, net on the consolidated statements of operations consisted of the following (in millions): Year Ended December 31, 2017 2016 2015 Merger integration expenses (1) $ 273 $ 514 $ 826 Fleet restructuring expenses (2) 232 177 210 Employee 2017 Tax Act bonus expense (3) 123 — — Labor contract expenses (4) 46 — — Mark-to-market adjustments for bankruptcy obligations 27 25 (53 ) Other operating charges (credits), net 11 (7 ) 68 Mainline operating special items, net 712 709 1,051 Regional operating special items, net 22 14 29 Operating special items, net 734 723 1,080 Debt refinancing and extinguishment charges 22 49 24 Venezuela foreign currency losses — — 592 Other nonoperating charges (credits), net — — (22 ) Nonoperating special items, net 22 49 594 Impact of the 2017 Tax Act on deferred tax assets and liabilities (7 ) — — Release of deferred tax valuation allowance — — (3,040 ) Other tax charges — — 25 Income tax special items, net (7 ) — (3,015 ) (1) Merger integration expenses included costs related to information technology, professional fees, re-branding of aircraft and airport facilities and training, and in 2016, also included costs related to alignment of labor union contracts, the launch of re-branded uniforms, relocation and severance, and in 2015, also included share-based compensation related to awards granted in connection with the Merger that fully vested in December 2015. (2) Fleet restructuring expenses, driven in part by the Merger, principally included the acceleration of depreciation, impairments, remaining lease payments and lease return costs for aircraft and related equipment grounded or expected to be grounded earlier than planned. (3) Employee bonus expense included costs related to the $1,000 cash bonus and associated payroll taxes granted to mainline employees as of December 31, 2017 in recognition of the 2017 Tax Act. (4) Labor contract expenses primarily included one-time charges to adjust the vacation accruals for pilots and flight attendants as a result of the mid-contract pay rate adjustments effective in the second quarter of 2017.
American Airlines, Inc. [Member]
Restructuring Cost and Reserve [Line Items]
Components of Special Items, Net Included in Consolidated Statements of Operations	Special items, net on the consolidated statements of operations consisted of the following (in millions): Year Ended December 31, 2017 2016 2015 Merger integration expenses (1) $ 273 $ 514 $ 826 Fleet restructuring expenses (2) 232 177 210 Employee 2017 Tax Act bonus expense (3) 123 — — Labor contract expenses (4) 46 — — Mark-to-market adjustments for bankruptcy obligations 27 25 (53 ) Other operating charges (credits), net 11 (7 ) 68 Mainline operating special items, net 712 709 1,051 Regional operating special items, net 3 13 18 Operating special items, net 715 722 1,069 Debt refinancing and extinguishment charges 22 49 24 Venezuela foreign currency losses — — 592 Nonoperating special items, net 22 49 616 Impact of the 2017 Tax Act on deferred tax assets and liabilities 93 — — Release of deferred tax valuation allowance — — (3,493 ) Other tax charges — — 25 Income tax special items, net 93 — (3,468 ) (1) Merger integration expenses included costs related to information technology, professional fees, re-branding of aircraft and airport facilities and training, and in 2016, also included costs related to alignment of labor union contracts, the launch of re-branded uniforms, relocation and severance, and in 2015, also included share-based compensation related to awards granted in connection with the Merger that fully vested in December 2015. (2) Fleet restructuring expenses, driven in part by the Merger, principally included the acceleration of depreciation, impairments, remaining lease payments and lease return costs for aircraft and related equipment grounded or expected to be grounded earlier than planned. (3) Employee bonus expense included costs related to the $1,000 cash bonus and associated payroll taxes granted to mainline employees as of December 31, 2017 in recognition of the 2017 Tax Act. (4) Labor contract expenses primarily included one-time charges to adjust the vacation accruals for pilots and flight attendants as a result of the mid-contract pay rate adjustments effective in the second quarter of 2017.

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings per Common Share	The following table sets forth the computation of basic and diluted earnings per common share (EPS) (in millions, except share and per share amounts): Year Ended December 31, 2017 2016 2015 Basic EPS: Net income $ 1,919 $ 2,676 $ 7,610 Weighted average common shares outstanding (in thousands) 489,164 552,308 668,393 Basic EPS $ 3.92 $ 4.85 $ 11.39 Diluted EPS: Net income for purposes of computing diluted EPS $ 1,919 $ 2,676 $ 7,610 Share computation for diluted EPS (in thousands): Basic weighted average common shares outstanding 489,164 552,308 668,393 Dilutive effect of stock awards 2,528 3,791 18,962 Diluted weighted average common shares outstanding 491,692 556,099 687,355 Diluted EPS $ 3.90 $ 4.81 $ 11.07 Restricted stock unit awards excluded from the calculation of diluted EPS because inclusion would be antidilutive (in thousands) 328 1,429 764

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Instrument [Line Items]
Schedule of Long-Term Debt	Long-term debt and capital lease obligations included in the consolidated balance sheets consisted of (in millions): December 31, 2017 2016 Secured 2013 Credit Facilities, variable interest rate of 3.55%, installments through 2020 (a) $ 1,825 $ 1,843 2014 Credit Facilities, variable interest rate of 3.43%, installments through 2021 (a) 728 735 April 2016 Credit Facilities, variable interest rate of 3.57%, installments through 2023 (a) 990 1,000 December 2016 Credit Facilities, variable interest rate of 3.48%, installments through 2023 (a) 1,238 1,250 Aircraft enhanced equipment trust certificates (EETCs), fixed interest rates ranging from 3.00% to 9.75%, averaging 4.30%, maturing from 2018 to 2029 (b) 11,881 10,912 Equipment loans and other notes payable, fixed and variable interest rates ranging from 2.34% to 8.48%, averaging 3.29%, maturing from 2018 to 2029 (c) 5,259 5,343 Special facility revenue bonds, fixed interest rates ranging from 5.00% to 8.00%, maturing from 2018 to 2035 857 891 Other secured obligations, fixed interest rates ranging from 3.81% to 12.24%, maturing from 2018 to 2028 773 849 23,551 22,823 Unsecured 5.50% senior notes, interest only payments until due in 2019 (d) 750 750 6.125% senior notes, interest only payments until due in 2018 (d) 500 500 4.625% senior notes, interest only payments until due in 2020 (d) 500 500 1,750 1,750 Total long-term debt and capital lease obligations 25,301 24,573 Less: Total unamortized debt discount, premium and issuance costs 236 229 Less: Current maturities 2,554 1,855 Long-term debt and capital lease obligations, net of current maturities $ 22,511 $ 22,489
Schedule of Credit Facilities	Certain details of our 2013, 2014, April 2016 and December 2016 Credit Facilities (collectively referred to as the Credit Facilities) are shown in the table below as of December 31, 2017 : 2013 Credit Facilities 2014 Credit Facilities April 2016 Credit Facilities December 2016 Credit Facilities 2013 Term Loan 2013 Revolving Facility 2014 Term Loan 2014 Revolving Facility April 2016 Term Loan April 2016 Revolving Facility December 2016 Term Loan Aggregate principal issued or credit facility availability (in millions) $1,900 $1,200 $750 $1,000 $1,000 $300 $1,250 Principal outstanding or drawn (in millions) $1,825 $— $728 $— $990 $— $1,238 Maturity date June 2020 October 2022 October 2021 October 2022 April 2023 October 2022 December 2023 LIBOR margin 2.00% 2.25% 2.00% 2.25% 2.00% 2.25% 2.00% The table below shows the maximum availability under revolving credit facilities, all of which were undrawn, as of December 31, 2017 (in millions): 2013 Revolving Facility $ 1,200 2014 Revolving Facility 1,000 April 2016 Revolving Facility 300 Total $ 2,500
Schedule of Maturities of Long-Term Debt and Capital Lease Obligations	At December 31, 2017 , the maturities of long-term debt and capital lease obligations are as follows (in millions): 2018 $ 2,598 2019 2,868 2020 4,069 2021 2,856 2022 1,288 2023 and thereafter 11,622 Total $ 25,301
Schedule of Collateral Coverage Tests	Specifically, we are required to meet certain collateral coverage tests on an annual basis for four credit facilities, as described below: 2013 Credit Facilities 2014 Credit Facilities April 2016 Credit Facilities December 2016 Credit Facilities Frequency of Appraisals of Appraised Collateral Annual Annual Annual Annual LTV Requirement 1.6x Collateral valuation to amount of debt outstanding (62.5% LTV) 1.6x Collateral valuation to amount of debt outstanding (62.5% LTV) 1.6x Collateral valuation to amount of debt outstanding (62.5% LTV) 1.6x Collateral valuation to amount of debt outstanding (62.5% LTV) LTV as of Last Measurement Date 33.9% 23.1% 42.7% 59.0% Collateral Description Generally, certain slots, route authorities, and airport gate leasehold rights used by American to operate all services between the U.S. and South America Generally, certain slots, route authorities and airport gate leasehold rights used by American to operate certain services between the U.S. and London Heathrow Generally, certain spare parts Generally, certain Ronald Reagan Washington National Airport (DCA) slots, certain La Guardia Airport (LGA) slots, certain simulators and certain leasehold rights
Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member]
Debt Instrument [Line Items]
Schedule of Long-Term Debt	December 31, 2017 , is set forth in the table below. 2017-2 EETCs Series AA Series A Series B Aggregate principal issued $545 million $252 million $221 million Remaining escrowed proceeds $152 million $70 million $61 million Fixed interest rate per annum 3.35% 3.60% 3.70% Maturity date October 2029 October 2029 October 2025 Certain information regarding the 2016-3 EETC equipment notes, as of December 31, 2017 , is set forth in the table below. 2016-3 EETCs Series AA Series A Series B Aggregate principal issued $558 million $256 million $193 million Fixed interest rate per annum 3.00% 3.25% 3.75% Maturity date October 2028 October 2028 October 2025 Certain information regarding the 2017-1 EETC equipment notes, as of December 31, 2017 , is set forth in the table below. 2017-1 EETCs Series AA Series A Series B Aggregate principal issued $537 million $248 million $198 million Fixed interest rate per annum 3.65% 4.00% 4.95% Maturity date February 2029 February 2029 February 2025
Unsecured Debt [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Schedule of Long-Term Debt	The details of our 6.125% , 5.50% and 4.625% senior notes are shown in the table below as of December 31, 2017 : 6.125% Senior Notes 5.50% Senior Notes 4.625% Senior Notes Aggregate principal issued and outstanding $500 million $750 million $500 million Maturity date June 2018 October 2019 March 2020 Fixed interest rate per annum 6.125% 5.50% 4.625% Interest payments Semi-annually in arrears in June and December Semi-annually in arrears in April and October Semi-annually in arrears in March and September
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Schedule of Long-Term Debt	Long-term debt and capital lease obligations included in the consolidated balance sheets consisted of (in millions): December 31, 2017 2016 Secured 2013 Credit Facilities, variable interest rate of 3.55%, installments through 2020 (a) $ 1,825 $ 1,843 2014 Credit Facilities, variable interest rate of 3.43%, installments through 2021 (a) 728 735 April 2016 Credit Facilities, variable interest rate of 3.57%, installments through 2023 (a) 990 1,000 December 2016 Credit Facilities, variable interest rate of 3.48%, installments through 2023 (a) 1,238 1,250 Aircraft enhanced equipment trust certificates (EETCs), fixed interest rates ranging from 3.00% to 9.75%, averaging 4.30%, maturing from 2018 to 2029 (b) 11,881 10,912 Equipment loans and other notes payable, fixed and variable interest rates ranging from 2.34% to 8.48%, averaging 3.29%, maturing from 2018 to 2029 (c) 5,259 5,343 Special facility revenue bonds, fixed interest rates ranging from 5.00% to 5.50%, maturing from 2018 to 2035 828 862 Other secured obligations, fixed interest rates ranging from 3.81% to 12.24%, maturing from 2018 to 2028 772 848 Total long-term debt and capital lease obligations 23,521 22,793 Less: Total unamortized debt discount, premium and issuance costs 227 216 Less: Current maturities 2,058 1,859 Long-term debt and capital lease obligations, net of current maturities $ 21,236 $ 20,718
Schedule of Credit Facilities	Certain details of American’s 2013, 2014, April 2016 and December 2016 Credit Facilities (collectively referred to as the Credit Facilities) are shown in the table below as of December 31, 2017 : 2013 Credit Facilities 2014 Credit Facilities April 2016 Credit Facilities December 2016 Credit Facilities 2013 Term 2013 Revolving 2014 Term 2014 Revolving April 2016 April 2016 December Aggregate principal issued or credit facility availability $1,900 $1,200 $750 $1,000 $1,000 $300 $1,250 Principal outstanding or drawn (in millions) $1,825 $— $728 $— $990 $— $1,238 Maturity date June 2020 October 2022 October 2021 October 2022 April 2023 October 2022 December 2023 LIBOR margin 2.00% 2.25% 2.00% 2.25% 2.00% 2.25% 2.00% The table below shows the maximum availability under revolving credit facilities, all of which were undrawn, as of December 31, 2017 (in millions): 2013 Revolving Facility $ 1,200 2014 Revolving Facility 1,000 April 2016 Revolving Facility 300 Total $ 2,500
Schedule of Maturities of Long-Term Debt and Capital Lease Obligations	At December 31, 2017 , the maturities of long-term debt and capital lease obligations are as follows (in millions): 2018 $ 2,098 2019 2,118 2020 3,563 2021 2,854 2022 1,286 2023 and thereafter 11,602 Total $ 23,521
Schedule of Collateral Coverage Tests	Specifically, American is required to meet certain collateral coverage tests on an annual basis for four credit facilities, as described below: 2013 Credit Facilities 2014 Credit Facilities April 2016 Credit Facilities December 2016 Credit Facilities Frequency of Appraisals of Appraised Collateral Annual Annual Annual Annual LTV Requirement 1.6x Collateral valuation to amount of debt outstanding (62.5% LTV) 1.6x Collateral valuation to amount of debt outstanding (62.5% LTV) 1.6x Collateral valuation to amount of debt outstanding (62.5% LTV) 1.6x Collateral valuation to amount of debt outstanding (62.5% LTV) LTV as of Last Measurement Date 33.9% 23.1% 42.7% 59.0% Collateral Description Generally, certain slots, route authorities, and airport gate leasehold rights used by American to operate all services between the U.S. and South America Generally, certain slots, route authorities and airport gate leasehold rights used by American to operate certain services between the U.S. and London Heathrow Generally, certain spare parts Generally, certain Ronald Reagan Washington National Airport (DCA) slots, certain La Guardia Airport (LGA) slots, certain simulators and certain leasehold rights
American Airlines, Inc. [Member] | Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member]
Debt Instrument [Line Items]
Schedule of Long-Term Debt	Certain information regarding the 2017-1 EETC equipment notes, as of December 31, 2017 , is set forth in the table below. 2017-1 EETCs Series AA Series A Series B Aggregate principal issued $537 million $248 million $198 million Fixed interest rate per annum 3.65% 4.00% 4.95% Maturity date February 2029 February 2029 February 2025 Certain information regarding the 2017-2 EETC equipment notes and the remaining escrowed proceeds of the 2017-2 EETCs, as of December 31, 2017 , is set forth in the table below. 2017-2 EETCs Series AA Series A Series B Aggregate principal issued $545 million $252 million $221 million Remaining escrowed proceeds $152 million $70 million $61 million Fixed interest rate per annum 3.35% 3.60% 3.70% Maturity date October 2029 October 2029 October 2025 Certain information regarding the 2016-3 EETC equipment notes, as of December 31, 2017 , is set forth in the table below. 2016-3 EETCs Series AA Series A Series B Aggregate principal issued $558 million $256 million $193 million Fixed interest rate per annum 3.00% 3.25% 3.75% Maturity date October 2028 October 2028 October 2025

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Taxes [Line Items]
Components of Income Tax Provision (Benefit)	The significant components of the income tax provision (benefit) were (in millions): Year Ended December 31, 2017 2016 2015 Current income tax provision: Federal $ — $ — $ — State and Local 24 12 20 Current income tax provision 24 12 20 Deferred income tax provision (benefit): Federal 1,085 1,508 (2,884 ) State and Local 56 103 (130 ) Deferred income tax provision (benefit) 1,141 1,611 (3,014 ) Total income tax provision (benefit) $ 1,165 $ 1,623 $ (2,994 )
Computation of Income Tax Provision (Benefit)	The income tax provision (benefit) differed from amounts computed at the statutory federal income tax rate as follows (in millions): Year Ended December 31, 2017 2016 2015 Statutory income tax provision $ 1,079 $ 1,505 $ 1,616 State income tax provision, net of federal tax effect 61 63 72 Book expenses not deductible for tax purposes 33 34 57 Bankruptcy administration expenses 1 1 3 2017 Tax Act (7 ) — — Change in valuation allowance (3 ) 7 (4,742 ) Other, net 1 13 — Income tax provision (benefit) $ 1,165 $ 1,623 $ (2,994 )
Deferred Tax Assets and Liabilities	The components of our deferred tax assets and liabilities were (in millions): December 31, 2017 2016 Deferred tax assets: Operating loss carryforwards $ 2,281 $ 3,853 Pensions 1,559 2,610 Loyalty program liability 420 485 Alternative minimum tax (AMT) credit carryforwards 344 344 Postretirement benefits other than pensions 170 291 Rent expense 160 256 Gains from lease transactions 107 213 Reorganization items 35 53 Other 678 972 Total deferred tax assets 5,754 9,077 Valuation allowance (36 ) (29 ) Net deferred tax assets 5,718 9,048 Deferred tax liabilities: Accelerated depreciation and amortization (5,045 ) (7,216 ) Other (279 ) (345 ) Total deferred tax liabilities (5,324 ) (7,561 ) Net deferred tax asset $ 394 $ 1,487
American Airlines, Inc. [Member]
Income Taxes [Line Items]
Components of Income Tax Provision (Benefit)	The significant components of the income tax provision (benefit) were (in millions): Year Ended December 31, 2017 2016 2015 Current income tax provision: Federal $ — $ — $ — State and Local 24 10 15 Current income tax provision 24 10 15 Deferred income tax provision (benefit): Federal 1,235 1,559 (3,407 ) State and Local 63 93 (60 ) Deferred income tax provision (benefit) 1,298 1,652 (3,467 ) Total income tax provision (benefit) $ 1,322 $ 1,662 $ (3,452 )
Computation of Income Tax Provision (Benefit)	The income tax provision (benefit) differed from amounts computed at the statutory federal income tax rate as follows (in millions): Year Ended December 31, 2017 2016 2015 Statutory income tax provision $ 1,135 $ 1,555 $ 1,635 State income tax provision, net of federal tax effect 54 67 71 Book expenses not deductible for tax purposes 30 32 55 Bankruptcy administration expenses 1 1 3 2017 Tax Act 93 — — Change in valuation allowance 4 (1 ) (5,216 ) Other, net 5 8 — Income tax provision (benefit) $ 1,322 $ 1,662 $ (3,452 )
Deferred Tax Assets and Liabilities	The components of American’s deferred tax assets and liabilities were (in millions): December 31, 2017 2016 Deferred tax assets: Operating loss carryforwards $ 2,409 $ 4,087 Pensions 1,549 2,595 Loyalty program liability 420 485 Alternative minimum tax (AMT) credit carryforwards 457 456 Postretirement benefits other than pensions 170 291 Rent expense 160 256 Gains from lease transactions 107 213 Reorganization items 35 53 Other 638 911 Total deferred tax assets 5,945 9,347 Valuation allowance (25 ) (13 ) Net deferred tax assets 5,920 9,334 Deferred tax liabilities: Accelerated depreciation and amortization (4,999 ) (7,101 ) Other (274 ) (335 ) Total deferred tax liabilities (5,273 ) (7,436 ) Net deferred tax asset $ 647 $ 1,898

Fair Value Measurements and O33

Fair Value Measurements and Other Investments (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Summary of Assets Measured at Fair Value on Recurring Basis	Assets measured at fair value on a recurring basis are summarized below (in millions): Fair Value Measurements as of December 31, 2017 Total Level 1 Level 2 Level 3 Short-term investments (1) (2) : Money market funds $ 188 $ 188 $ — $ — Corporate obligations 1,620 — 1,620 — Bank notes/certificates of deposit/time deposits 2,663 — 2,663 — Repurchase agreements 300 — 300 — 4,771 188 4,583 — Restricted cash and short-term investments (1) 318 108 210 — Total $ 5,089 $ 296 $ 4,793 $ — (1) Unrealized gains or losses on short-term investments and restricted cash and short-term investments are recorded in accumulated other comprehensive income (loss) at each measurement date. (2) All short-term investments are classified as available-for-sale and stated at fair value. Our short-term investments mature in one year or less except for $700 million of bank notes/certificates of deposit/time deposits and $341 million of corporate obligations. Fair Value Measurements as of December 31, 2016 Total Level 1 Level 2 Level 3 Short-term investments (1) (2) : Money market funds $ 589 $ 589 $ — $ — Corporate obligations 2,550 — 2,550 — Bank notes/certificates of deposit/time deposits 2,898 — 2,898 — 6,037 589 5,448 — Restricted cash and short-term investments (1) 638 638 — — Total $ 6,675 $ 1,227 $ 5,448 $ — (1) Unrealized gains or losses on short-term investments and restricted cash and short-term investments are recorded in accumulated other comprehensive income (loss) at each measurement date. (2) All short-term investments are classified as available-for-sale and stated at fair value. Our short-term investments mature in one year or less except for $385 million of bank notes/certificates of deposit/time deposits and $230 million of corporate obligations.
Schedule of Carrying Value and Estimated Fair Value of Long-Term Debt, Including Current Maturities	The carrying value and estimated fair value of our long-term debt, including current maturities, were as follows (in millions): December 31, 2017 December 31, 2016 Carrying Value Fair Value Carrying Value Fair Value Long-term debt, including current maturities $ 25,065 $ 25,848 $ 24,344 $ 24,983
American Airlines, Inc. [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Summary of Assets Measured at Fair Value on Recurring Basis	Assets measured at fair value on a recurring basis are summarized below (in millions): Fair Value Measurements as of December 31, 2017 Total Level 1 Level 2 Level 3 Short-term investments (1) (2) : Money market funds $ 186 $ 186 $ — $ — Corporate obligations 1,620 — 1,620 — Bank notes/certificates of deposit/time deposits 2,662 — 2,662 — Repurchase agreements 300 — 300 — 4,768 186 4,582 — Restricted cash and short-term investments (1) 318 108 210 — Total $ 5,086 $ 294 $ 4,792 $ — (1) Unrealized gains or losses on short-term investments and restricted cash and short-term investments are recorded in accumulated other comprehensive income (loss) at each measurement date. (2) All short-term investments are classified as available-for-sale and stated at fair value. American’s short-term investments mature in one year or less except for $700 million of bank notes/certificates of deposit/time deposits and $341 million of corporate obligations. Fair Value Measurements as of December 31, 2016 Total Level 1 Level 2 Level 3 Short-term investments (1) (2) : Money market funds $ 587 $ 587 $ — $ — Corporate obligations 2,550 — 2,550 — Bank notes/certificates of deposit/time deposits 2,897 — 2,897 — 6,034 587 5,447 — Restricted cash and short-term investments (1) 638 638 — — Total $ 6,672 $ 1,225 $ 5,447 $ — (1) Unrealized gains or losses on short-term investments and restricted cash and short-term investments are recorded in accumulated other comprehensive income (loss) at each measurement date. (2) All short-term investments are classified as available-for-sale and stated at fair value. American’s short-term investments mature in one year or less except for $385 million of bank notes/certificates of deposit/time deposits and $230 million of corporate obligations.
Schedule of Carrying Value and Estimated Fair Value of Long-Term Debt, Including Current Maturities	The carrying value and estimated fair value of American’s long-term debt, including current maturities, were as follows (in millions): December 31, 2017 December 31, 2016 Carrying Value Fair Value Carrying Value Fair Value Long-term debt, including current maturities $ 23,294 $ 24,029 $ 22,577 $ 23,181

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Schedule of Changes in Projected Benefit Obligations	The following tables provide a reconciliation of the changes in the pension and retiree medical and other postretirement benefits obligations, fair value of plan assets and a statement of funded status as of December 31, 2017 and 2016 : Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2017 2016 (In millions) Benefit obligation at beginning of period $ 17,238 $ 16,395 $ 991 $ 1,131 Service cost 2 2 4 3 Interest cost 721 749 39 47 Actuarial (gain) loss (1) (2) 1,016 729 49 (105 ) Plan amendments — — — 7 Settlements (4 ) (2 ) — — Benefit payments (726 ) (635 ) (80 ) (92 ) Other 28 — 8 — Benefit obligation at end of period $ 18,275 $ 17,238 $ 1,011 $ 991 Fair value of plan assets at beginning of period $ 10,017 $ 9,707 $ 266 $ 253 Actual return on plan assets 1,797 915 37 22 Employer contributions (3) 286 32 72 83 Settlements (4 ) (2 ) — — Benefit payments (726 ) (635 ) (80 ) (92 ) Other 25 — — — Fair value of plan assets at end of period $ 11,395 $ 10,017 $ 295 $ 266 Funded status at end of period $ (6,880 ) $ (7,221 ) $ (716 ) $ (725 ) (1) The December 31, 2017 and 2016 pension actuarial loss primarily relates to weighted average discount rate assumption changes and changes to our mortality assumptions. (2) The December 31, 2017 retiree medical and other postretirement benefits actuarial (gain) loss primarily relates to plan experience adjustments, weighted average discount rate assumption changes and changes to our mortality assumptions and as of December 31, 2016 , also includes medical trend and cost assumption changes. (3) During 2017 , we contributed $286 million to our defined benefit pension plans, including supplemental contributions of $261 million in addition to a $25 million minimum required cash contribution.
Schedule of Changes in Fair Value of Plan Assets	Fair value of plan assets at beginning of period $ 10,017 $ 9,707 $ 266 $ 253 Actual return on plan assets 1,797 915 37 22 Employer contributions (3) 286 32 72 83 Settlements (4 ) (2 ) — — Benefit payments (726 ) (635 ) (80 ) (92 ) Other 25 — — — Fair value of plan assets at end of period $ 11,395 $ 10,017 $ 295 $ 266 Funded status at end of period $ (6,880 ) $ (7,221 ) $ (716 ) $ (725 ) (1) The December 31, 2017 and 2016 pension actuarial loss primarily relates to weighted average discount rate assumption changes and changes to our mortality assumptions. (2) The December 31, 2017 retiree medical and other postretirement benefits actuarial (gain) loss primarily relates to plan experience adjustments, weighted average discount rate assumption changes and changes to our mortality assumptions and as of December 31, 2016 , also includes medical trend and cost assumption changes. (3) During 2017 , we contributed $286 million to our defined benefit pension plans, including supplemental contributions of $261 million in addition to a $25 million minimum required cash contribution.
Schedule of Amounts Recognized in Consolidated Balance Sheets	Balance Sheet Position Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2017 2016 (In millions) As of December 31, Current liability $ 10 $ 7 $ 89 $ 97 Noncurrent liability 6,870 7,214 627 628 Total liabilities $ 6,880 $ 7,221 $ 716 $ 725
Schedule of Amounts Recognized in Other Comprehensive Income	Net actuarial loss (gain) $ 5,351 $ 5,484 $ (388 ) $ (430 ) Prior service cost (benefit) 160 188 (600 ) (837 ) Total accumulated other comprehensive loss (income), pre-tax $ 5,511 $ 5,672 $ (988 ) $ (1,267 )
Schedule of Accumulated Benefit Obligations Exceeding Fair Value of Plan Assets	Plans with Accumulated Benefit Obligations Exceeding Fair Value of Plan Assets Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2017 2016 (In millions) Projected benefit obligation $ 18,245 $ 17,209 $ — $ — Accumulated benefit obligation (ABO) 18,235 17,197 — — Accumulated postretirement benefit obligation — — 1,011 990 Fair value of plan assets 11,364 9,986 295 266 ABO less fair value of plan assets 6,871 7,211 — —
Components of Net Periodic Benefit Cost (Income)	Net Periodic Benefit Cost (Income) Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2015 2017 2016 2015 (In millions) Defined benefit plans: Service cost $ 2 $ 2 $ 2 $ 4 $ 3 $ 3 Interest cost 721 749 737 39 47 50 Expected return on assets (790 ) (750 ) (851 ) (21 ) (20 ) (19 ) Settlements 1 — 1 — — — Amortization of: Prior service cost (benefit) 28 28 28 (237 ) (240 ) (243 ) Unrecognized net loss (gain) 144 126 112 (23 ) (17 ) (9 ) Net periodic benefit cost (income) 106 155 29 (238 ) (227 ) (218 ) Defined contribution plan cost 851 766 662 N/A N/A N/A Total cost (income) $ 957 $ 921 $ 691 $ (238 ) $ (227 ) $ (218 )
Schedule of Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost	The following actuarial assumptions were used to determine our benefit obligations and net periodic benefit cost for the periods presented: Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2017 2016 Benefit obligations: Weighted average discount rate 3.80% 4.30% 3.60% 4.10% Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2015 2017 2016 2015 Net periodic benefit cost: Weighted average discount rate 4.30% 4.70% 4.30% 4.10% 4.42% 4.00% Weighted average expected rate of return on plan assets 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% Weighted average health care cost trend rate assumed for next year (1) N/A N/A N/A 4.19% 4.25% 5.21% (1) The weighted average health care cost trend rate at December 31, 2017 is assumed to decline gradually to 3.76% by 2025 and remain level thereafter.
Schedule of One Percentage Point Change in Assumed Health Care Cost Trend Rates	A one percentage point change in the assumed health care cost trend rates would have the following effects on our retiree medical and other postretirement benefits plans (in millions): 1% Increase 1% Decrease Increase (decrease) on 2017 service and interest cost $ 2 $ (2 ) Increase (decrease) on benefit obligation as of December 31, 2017 54 (51 )
Schedule of Expected Future Service Benefit Payments	The following benefit payments, which reflect expected future service as appropriate, are expected to be paid (approximately, in millions): 2018 2019 2020 2021 2022 2023-2027 Pension benefits $ 715 $ 754 $ 799 $ 843 $ 884 $ 4,976 Retiree medical and other postretirement benefits 96 92 80 75 70 315
Schedule of Allocation of Plan Assets	The current strategic target asset allocation is as follows: Asset Class/Sub-Class Allowed Range Equity 65% - 90% Public: U.S. Large 20% - 50% U.S. Small/Mid 0% - 10% International 17% - 27% Emerging Markets 5% - 11% Alternative Investments 5% - 20% Fixed Income 15% - 40% Public: U.S. Long Duration 15% - 30% High Yield and Emerging Markets 0% - 10% Private Income 0% - 10% Other 0% - 5% Cash Equivalents 0% - 5%
Changes in Fair Value Measurements of Level 3 Investments	Changes in fair value measurements of Level 3 investments during the year ended December 31, 2017 , were as follows (in millions): Private Equity Partnerships Insurance Group Annuity Contracts Beginning balance at December 31, 2016 $ 21 $ 2 Actual loss on plan assets: Relating to assets still held at the reporting date (4 ) — Purchases 1 — Sales (1 ) — Transfers out (3 ) — Ending balance at December 31, 2017 $ 14 $ 2 Changes in fair value measurements of Level 3 investments during the year ended December 31, 2016 , were as follows (in millions): Private Equity Partnerships Insurance Group Annuity Contracts Beginning balance at December 31, 2015 $ 16 $ 2 Actual return on plan assets: Relating to assets sold during the period 7 — Purchases 7 — Sales (9 ) — Ending balance at December 31, 2016 $ 21 $ 2
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Allocation of Plan Assets	The fair value of our pension plan assets at December 31, 2017 and 2016 , by asset category, are as follows (in millions): Fair Value Measurements as of December 31, 2017 Asset Category Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Cash and cash equivalents $ 28 $ — $ — $ 28 Equity securities: International markets (a) (b) 3,837 — — 3,837 Large-cap companies (b) 2,451 — — 2,451 Mid-cap companies (b) 744 — — 744 Small-cap companies (b) 125 — — 125 Mutual funds (c) 55 — — 55 Fixed income: Corporate bonds (d) — 2,344 — 2,344 Government securities (e) — 238 — 238 U.S. municipal securities — 39 — 39 Alternative instruments: Private equity partnerships (f) — — 14 14 Private equity partnerships measured at net asset value (f) (h) — — — 879 Common/collective trusts (g) — 315 — 315 Common/collective trusts and 103-12 Investment Trust measured at net asset value (g) (h) — — — 283 Insurance group annuity contracts — — 2 2 Dividend and interest receivable 44 — — 44 Due to/from brokers for sale of securities – net 3 — — 3 Other liabilities – net (6 ) — — (6 ) Total $ 7,281 $ 2,936 $ 16 $ 11,395 a) Holdings are diversified as follows: 17% United Kingdom, 11% Japan, 9% France, 6% Switzerland, 16% emerging markets and the remaining 41% with no concentration greater than 5% in any one country. b) There are no significant concentrations of holdings by company or industry. c) Investment includes mutual funds invested 39% in equity securities of large-cap, mid-cap and small-cap U.S. companies, 34% in U.S. treasuries and corporate bonds and 27% in equity securities of international companies. d) Includes approximately 76% investments in corporate debt with a S&P rating lower than A and 24% investments in corporate debt with a S&P rating A or higher. Holdings include 85% U.S. companies, 12% international companies and 3% emerging market companies. e) Includes approximately 27% investments in U.S. domestic government securities, 43% in emerging market government securities and 30% in international government securities. There are no significant foreign currency risks within this classification. f) Includes limited partnerships that invest primarily in U.S. ( 94% ) and European ( 6% ) buyout opportunities of a range of privately held companies. The pension plan’s master trust does not have the right to redeem its limited partnership investment at its net asset value, but rather receives distributions as the underlying assets are liquidated. It is estimated that the underlying assets of these funds will be gradually liquidated over the next one to ten years . Additionally, the pension plan’s master trust has future funding commitments of approximately $903 million over the next ten years. g) Investment includes 42% in a collective interest trust investing primarily in short-term securities, 40% in an emerging market 103-12 Investment Trust with investments in emerging country equity securities, 10% in Canadian segregated balanced value, income growth and diversified pooled funds and 8% in a common/collective trust investing in securities of smaller companies located outside the U.S., including developing markets. For some trusts, requests for withdrawals must meet specific requirements with advance notice of redemption preferred. h) Certain investments that are measured using net asset value per share (or its equivalent) as a practical expedient for fair value have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the notes to the consolidated financial statements. Fair Value Measurements as of December 31, 2016 Asset Category Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Cash and cash equivalents $ 573 $ — $ — $ 573 Equity securities: International markets (a) (b) 3,232 — — 3,232 Large-cap companies (b) 2,253 — — 2,253 Mid-cap companies (b) 371 — — 371 Small-cap companies (b) 6 — — 6 Mutual funds (c) 49 — — 49 Fixed income: Corporate bonds (d) — 2,337 — 2,337 Government securities (e) — 150 — 150 U.S. municipal securities — 37 — 37 Alternative instruments: Private equity partnerships (f) — — 21 21 Private equity partnerships measured at net asset value (f) (h) — — — 703 Common/collective trusts (g) — 32 — 32 Common/collective trusts and 103-12 Investment Trust measured at net asset value (g) (h) — — — 227 Insurance group annuity contracts — — 2 2 Dividend and interest receivable 40 — — 40 Due to/from brokers for sale of securities – net (9 ) — — (9 ) Other liabilities – net (7 ) — — (7 ) Total $ 6,508 $ 2,556 $ 23 $ 10,017 a) Holdings are diversified as follows: 15% United Kingdom, 12% Japan, 10% France, 7% Switzerland, 6% Netherlands, 17% other emerging markets and the remaining 33% with no concentration greater than 5% in any one country. b) There are no significant concentrations of holdings by company or industry. c) Investment includes mutual funds invested 42% in equity securities of large-cap, mid-cap and small-cap U.S. companies, 33% in U.S. treasuries and corporate bonds and 25% in equity securities of international companies. d) Includes approximately 74% investments in corporate debt with a S&P rating lower than A and 26% investments in corporate debt with a S&P rating A or higher. Holdings include 86% U.S. companies, 12% international companies and 2% emerging market companies. e) Includes approximately 61% investments in U.S. domestic government securities and 39% in emerging market government securities. There are no significant foreign currency risks within this classification. f) Includes limited partnerships that invest primarily in U.S. ( 95% ) and European ( 5% ) buyout opportunities of a range of privately held companies. The pension plan’s master trust does not have the right to redeem its limited partnership investment at its net asset value, but rather receives distributions as the underlying assets are liquidated. It is estimated that the underlying assets of these funds will be gradually liquidated over the next one to ten years . Additionally, the pension plan’s master trust has future funding commitments of approximately $456 million over the next ten years . g) Investment includes 73% in an emerging market 103-12 Investment Trust with investments in emerging country equity securities, 12% in Canadian segregated balanced value, income growth and diversified pooled funds and 15% in a common/collective trust investing in securities of smaller companies located outside the U.S., including developing markets. Requests for withdrawals must meet specific requirements with advance notice of redemption preferred. h) Certain investments that are measured using net asset value per share (or its equivalent) as a practical expedient for fair value have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the notes to the consolidated financial statements.
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Allocation of Plan Assets	The fair value of our retiree medical and other postretirement benefits plans assets at December 31, 2017 by asset category, were as follows (in millions): Fair Value Measurements as of December 31, 2017 Asset Category Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Money market fund $ 5 $ — $ — $ 5 Mutual funds – AAL Class — 290 — 290 Total $ 5 $ 290 $ — $ 295 The fair value of our retiree medical and other postretirement benefits plans assets at December 31, 2016 by asset category, were as follows (in millions): Fair Value Measurements as of December 31, 2016 Asset Category Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Money market fund $ 5 $ — $ — $ 5 Mutual funds – Institutional Class 261 — — 261 Total $ 266 $ — $ — $ 266
American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Changes in Projected Benefit Obligations	The following tables provide a reconciliation of the changes in the pension and retiree medical and other postretirement benefits obligations, fair value of plan assets and a statement of funded status as of December 31, 2017 and 2016 : Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2017 2016 (In millions) Benefit obligation at beginning of period $ 17,148 $ 16,310 $ 990 $ 1,129 Service cost 2 2 4 3 Interest cost 717 746 39 47 Actuarial (gain) loss (1) (2) 1,007 725 49 (104 ) Plan amendments — — — 7 Settlements (4 ) (2 ) — — Benefit payments (723 ) (633 ) (80 ) (92 ) Other 28 — 8 — Benefit obligation at end of period $ 18,175 $ 17,148 $ 1,010 $ 990 Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2017 2016 (In millions) Fair value of plan assets at beginning of period $ 9,968 $ 9,660 $ 266 $ 253 Actual return on plan assets 1,788 911 37 22 Employer contributions (3) 286 32 72 83 Settlements (4 ) (2 ) — — Benefit payments (723 ) (633 ) (80 ) (92 ) Other 25 — — — Fair value of plan assets at end of period $ 11,340 $ 9,968 $ 295 $ 266 Funded status at end of period $ (6,835 ) $ (7,180 ) $ (715 ) $ (724 ) (1) The December 31, 2017 and 2016 pension actuarial loss primarily relates to weighted average discount rate assumption changes and changes to American’s mortality assumptions. (2) The December 31, 2017 retiree medical and other postretirement benefits actuarial (gain) loss primarily relates to plan experience adjustments, weighted average discount rate assumption changes and changes to American’s mortality assumptions and as of December 31, 2016 , also includes medical trend and cost assumption changes. (3) During 2017, American contributed $286 million to its defined benefit pension plans, including supplemental contributions of $261 million in addition to a $25 million minimum required cash contribution.
Schedule of Changes in Fair Value of Plan Assets	Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2017 2016 (In millions) Fair value of plan assets at beginning of period $ 9,968 $ 9,660 $ 266 $ 253 Actual return on plan assets 1,788 911 37 22 Employer contributions (3) 286 32 72 83 Settlements (4 ) (2 ) — — Benefit payments (723 ) (633 ) (80 ) (92 ) Other 25 — — — Fair value of plan assets at end of period $ 11,340 $ 9,968 $ 295 $ 266 Funded status at end of period $ (6,835 ) $ (7,180 ) $ (715 ) $ (724 ) (1) The December 31, 2017 and 2016 pension actuarial loss primarily relates to weighted average discount rate assumption changes and changes to American’s mortality assumptions. (2) The December 31, 2017 retiree medical and other postretirement benefits actuarial (gain) loss primarily relates to plan experience adjustments, weighted average discount rate assumption changes and changes to American’s mortality assumptions and as of December 31, 2016 , also includes medical trend and cost assumption changes. (3) During 2017, American contributed $286 million to its defined benefit pension plans, including supplemental contributions of $261 million in addition to a $25 million minimum required cash contribution.
Schedule of Amounts Recognized in Consolidated Balance Sheets	Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2017 2016 (In millions) As of December 31, Current liability $ 10 $ 7 $ 88 $ 97 Noncurrent liability 6,825 7,173 627 627 Total liabilities $ 6,835 $ 7,180 $ 715 $ 724
Schedule of Amounts Recognized in Other Comprehensive Income	Net actuarial loss (gain) $ 5,337 $ 5,472 $ (388 ) $ (429 ) Prior service cost (benefit) 159 188 (600 ) (837 ) Total accumulated other comprehensive loss (income), pre-tax $ 5,496 $ 5,660 $ (988 ) $ (1,266 )
Schedule of Accumulated Benefit Obligations Exceeding Fair Value of Plan Assets	Plans with Accumulated Benefit Obligations Exceeding Fair Value of Plan Assets Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2017 2016 (In millions) Projected benefit obligation $ 18,144 $ 17,119 $ — $ — Accumulated benefit obligation (ABO) 18,135 17,108 — — Accumulated postretirement benefit obligation — — 1,010 990 Fair value of plan assets 11,307 9,936 295 266 ABO less fair value of plan assets 6,828 7,172 — —
Components of Net Periodic Benefit Cost (Income)	Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2015 2017 2016 2015 (In millions) Defined benefit plans: Service cost $ 2 $ 2 $ 1 $ 4 $ 3 $ 3 Interest cost 717 746 733 39 47 50 Expected return on assets (786 ) (747 ) (848 ) (21 ) (20 ) (19 ) Settlements 1 — 1 — — — Amortization of: Prior service cost (benefit) 28 28 28 (237 ) (240 ) (243 ) Unrecognized net loss (gain) 144 125 111 (23 ) (16 ) (9 ) Net periodic benefit cost (income) 106 154 26 (238 ) (226 ) (218 ) Defined contribution plan cost 844 761 657 N/A N/A N/A Total cost (income) $ 950 $ 915 $ 683 $ (238 ) $ (226 ) $ (218 )
Schedule of Assumptions Used to Determine Benefit Obligations and Net Periodic Benefit Cost	The following actuarial assumptions were used to determine American’s benefit obligations and net periodic benefit cost for the periods presented: Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2017 2016 Benefit obligations: Weighted average discount rate 3.80% 4.30% 3.60% 4.10% Pension Benefits Retiree Medical and Other Postretirement Benefits 2017 2016 2015 2017 2016 2015 Net periodic benefit cost: Weighted average discount rate 4.30% 4.70% 4.30% 4.10% 4.42% 4.00% Weighted average expected rate of return on plan assets 8.00% 8.00% 8.00% 8.00% 8.00% 8.00% Weighted average health care cost trend rate assumed for next year (1) N/A N/A N/A 4.19% 4.25% 5.21% (1) The weighted average health care cost trend rate at December 31, 2017 is assumed to decline gradually to 3.76% by 2025 and remain level thereafter.
Schedule of One Percentage Point Change in Assumed Health Care Cost Trend Rates	A one percentage point change in the assumed health care cost trend rates would have the following effects on American’s retiree medical and other postretirement benefits plans (in millions): 1% Increase 1% Decrease Increase (decrease) on 2017 service and interest cost $ 2 $ (2 ) Increase (decrease) on benefit obligation as of December 31, 2017 54 (51 )
Schedule of Expected Future Service Benefit Payments	The following benefit payments, which reflect expected future service as appropriate, are expected to be paid (approximately, in millions): 2018 2019 2020 2021 2022 2023-2027 Pension benefits $ 712 $ 750 $ 795 $ 839 $ 879 $ 4,951 Retiree medical and other postretirement benefits 96 92 80 75 70 314
Schedule of Allocation of Plan Assets	The current strategic target asset allocation is as follows: Asset Class/Sub-Class Allowed Range Equity 65% - 90% Public: U.S. Large 20% - 50% U.S. Small/Mid 0% - 10% International 17% - 27% Emerging Markets 5% - 11% Alternative Investments 5% - 20% Fixed Income 15% - 40% Public: U.S. Long Duration 15% - 30% High Yield and Emerging Markets 0% - 10% Private Income 0% - 10% Other 0% - 5% Cash Equivalents 0% - 5%
Changes in Fair Value Measurements of Level 3 Investments	Changes in fair value measurements of Level 3 investments during the year ended December 31, 2017 , were as follows (in millions): Private Equity Partnerships Insurance Group Annuity Contracts Beginning balance at December 31, 2016 $ 21 $ 2 Actual loss on plan assets: Relating to assets still held at the reporting date (4 ) — Purchases 1 — Sales (1 ) — Transfers out (3 ) — Ending balance at December 31, 2017 $ 14 $ 2 Changes in fair value measurements of Level 3 investments during the year ended December 31, 2016 , were as follows (in millions): Private Equity Partnerships Insurance Group Annuity Contracts Beginning balance at December 31, 2015 $ 16 $ 2 Actual return on plan assets: Relating to assets sold during the period 7 — Purchases 7 — Sales (9 ) — Ending balance at December 31, 2016 $ 21 $ 2
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Allocation of Plan Assets	The fair value of American’s pension plan assets at December 31, 2017 and 2016 , by asset category, are as follows (in millions): Fair Value Measurements as of December 31, 2017 Asset Category Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Cash and cash equivalents $ 28 $ — $ — $ 28 Equity securities: International markets (a) (b) 3,837 — — 3,837 Large-cap companies (b) 2,451 — — 2,451 Mid-cap companies (b) 744 — — 744 Small-cap companies (b) 125 — — 125 Fixed income: Corporate bonds (c) — 2,344 — 2,344 Government securities (d) — 238 — 238 U.S. municipal securities — 39 — 39 Alternative instruments: Private equity partnerships (e) — — 14 14 Private equity partnerships measured at net asset value (e) (g) — — — 879 Common/collective trusts (f) — 315 — 315 Common/collective trusts and 103-12 Investment Trust measured at net asset value (f) (g) — — — 283 Insurance group annuity contracts — — 2 2 Dividend and interest receivable 44 — — 44 Due to/from brokers for sale of securities – net 3 — — 3 Other liabilities – net (6 ) — — (6 ) Total $ 7,226 $ 2,936 $ 16 $ 11,340 a) Holdings are diversified as follows: 17% United Kingdom, 11% Japan, 9% France, 6% Switzerland, 16% emerging markets and the remaining 41% with no concentration greater than 5% in any one country. b) There are no significant concentrations of holdings by company or industry. c) Includes approximately 76% investments in corporate debt with a S&P rating lower than A and 24% investments in corporate debt with a S&P rating A or higher. Holdings include 85% U.S. companies, 12% international companies and 3% emerging market companies. d) Includes approximately 27% investments in U.S. domestic government securities, 43% in emerging market government securities and 30% in international government securities. There are no significant foreign currency risks within this classification. e) Includes limited partnerships that invest primarily in U.S. ( 94% ) and European ( 6% ) buyout opportunities of a range of privately held companies. The pension plan’s master trust does not have the right to redeem its limited partnership investment at its net asset value, but rather receives distributions as the underlying assets are liquidated. It is estimated that the underlying assets of these funds will be gradually liquidated over the next one to ten years . Additionally, the pension plan’s master trust has future funding commitments of approximately $903 million over the next ten years . f) Investment includes 42% in a collective interest trust investing primarily in short-term securities, 40% in an emerging market 103-12 Investment Trust with investments in emerging country equity securities, 10% in Canadian segregated balanced value, income growth and diversified pooled funds and 8% in a common/collective trust investing in securities of smaller companies located outside the U.S., including developing markets. For some trusts, requests for withdrawals must meet specific requirements with advance notice of redemption preferred. g) Certain investments that are measured using net asset value per share (or its equivalent) as a practical expedient for fair value have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the notes to the consolidated financial statements. Fair Value Measurements as of December 31, 2016 Asset Category Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Cash and cash equivalents $ 573 $ — $ — $ 573 Equity securities: International markets (a) (b) 3,232 — — 3,232 Large-cap companies (b) 2,253 — — 2,253 Mid-cap companies (b) 371 — — 371 Small-cap companies (b) 6 — — 6 Fixed income: Corporate bonds (c) — 2,337 — 2,337 Government securities (d) — 150 — 150 U.S. municipal securities — 37 — 37 Alternative instruments: Private equity partnerships (e) — — 21 21 Private equity partnerships measured at net asset value (e) (g) — — — 703 Common/collective trusts (f) — 32 — 32 Common/collective trusts and 103-12 Investment Trust measured at net asset value (f) (g) — — — 227 Insurance group annuity contracts — — 2 2 Dividend and interest receivable 40 — — 40 Due to/from brokers for sale of securities – net (9 ) — — (9 ) Other liabilities – net (7 ) — — (7 ) Total $ 6,459 $ 2,556 $ 23 $ 9,968 a) Holdings are diversified as follows: 15% United Kingdom, 12% Japan, 10% France, 7% Switzerland, 6% Netherlands, 17% other emerging markets and the remaining 33% with no concentration greater than 5% in any one country. b) There are no significant concentrations of holdings by company or industry. c) Includes approximately 74% investments in corporate debt with a S&P rating lower than A and 26% investments in corporate debt with a S&P rating A or higher. Holdings include 86% U.S. companies, 12% international companies and 2% emerging market companies. d) Includes approximately 61% investments in U.S. domestic government securities and 39% in emerging market government securities. There are no significant foreign currency risks within this classification. e) Includes limited partnerships that invest primarily in U.S. ( 95% ) and European ( 5% ) buyout opportunities of a range of privately held companies. The pension plan’s master trust does not have the right to redeem its limited partnership investment at its net asset value, but rather receives distributions as the underlying assets are liquidated. It is estimated that the underlying assets of these funds will be gradually liquidated over the next one to ten years . Additionally, the pension plan’s master trust has future funding commitments of approximately $456 million over the next ten years . f) Investment includes 73% in an emerging market 103-12 Investment Trust with investments in emerging country equity securities, 12% in Canadian segregated balanced value, income growth and diversified pooled funds and 15% in a common/collective trust investing in securities of smaller companies located outside the U.S., including developing markets. Requests for withdrawals must meet specific requirements with advance notice of redemption preferred. g) Certain investments that are measured using net asset value per share (or its equivalent) as a practical expedient for fair value have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the notes to the consolidated financial statements.
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Allocation of Plan Assets	The fair value of American’s retiree medical and other postretirement benefits plans assets at December 31, 2017 by asset category, were as follows (in millions): Fair Value Measurements as of December 31, 2017 Asset Category Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Money market fund $ 5 $ — $ — $ 5 Mutual funds – AAL Class — 290 — 290 Total $ 5 $ 290 $ — $ 295 The fair value of American’s retiree medical and other postretirement benefits plans assets at December 31, 2016 by asset category, were as follows (in millions): Fair Value Measurements as of December 31, 2016 Asset Category Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Money market fund $ 5 $ — $ — $ 5 Mutual funds – Institutional Class 261 — — 261 Total $ 266 $ — $ — $ 266

Accumulated Other Comprehensi35

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of Accumulated Other Comprehensive Income (Loss)	The components of accumulated other comprehensive income (loss) (AOCI) are as follows (in millions): Pension, Unrealized Gain (Loss) on Investments Income Tax (1) Total Balance at December 31, 2015 $ (3,842 ) $ (10 ) $ (880 ) $ (4,732 ) Other comprehensive income (loss) before reclassifications (462 ) 10 166 (286 ) Amounts reclassified from AOCI (102 ) — 37 (2) (65 ) Net current-period other comprehensive income (loss) (564 ) 10 203 (351 ) Balance at December 31, 2016 (4,406 ) — (677 ) (5,083 ) Other comprehensive income (loss) before reclassifications (30 ) (1 ) 15 (16 ) Amounts reclassified from AOCI (87 ) — 32 (2) (55 ) Net current-period other comprehensive income (loss) (117 ) (1 ) 47 (71 ) Balance at December 31, 2017 $ (4,523 ) $ (1 ) $ (630 ) $ (5,154 ) (1) Relates principally to pension, retiree medical and other postretirement benefits obligations that will not be recognized in net income until the obligations are fully extinguished. (2) Relates to pension, retiree medical and other postretirement benefits obligations and is recognized within the income tax provision on the consolidated statement of operations.
Reclassifications out of Accumulated Other Comprehensive Income (Loss)	Reclassifications out of AOCI for the years ended December 31, 2017 and 2016 are as follows (in millions): Amount reclassified from AOCI Affected line items on the consolidated statement of operations Year Ended December 31, AOCI Components 2017 2016 Amortization of pension, retiree medical and other postretirement benefits: Prior service benefit $ (132 ) $ (134 ) Salaries, wages and benefits Actuarial loss 77 69 Salaries, wages and benefits Total reclassifications for the period, net of tax $ (55 ) $ (65 )
American Airlines, Inc. [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of Accumulated Other Comprehensive Income (Loss)	The components of accumulated other comprehensive income (loss) (AOCI) are as follows (in millions): Pension, Unrealized Gain (Loss) on Investments Income (1) Total Balance at December 31, 2015 $ (3,831 ) $ (9 ) $ (991 ) $ (4,831 ) Other comprehensive income (loss) before reclassifications (461 ) 9 166 (286 ) Amounts reclassified from AOCI (102 ) — 37 (2) (65 ) Net current-period other comprehensive income (loss) (563 ) 9 203 (351 ) Balance at December 31, 2016 (4,394 ) — (788 ) (5,182 ) Other comprehensive income (loss) before reclassifications (27 ) (1 ) 14 (14 ) Amounts reclassified from AOCI (87 ) — 32 (2) (55 ) Net current-period other comprehensive income (loss) (114 ) (1 ) 46 (69 ) Balance at December 31, 2017 $ (4,508 ) $ (1 ) $ (742 ) $ (5,251 ) (1) Relates principally to pension, retiree medical and other postretirement benefits obligations that will not be recognized in net income until the obligations are fully extinguished. (2) Relates to pension, retiree medical and other postretirement benefits obligations and is recognized within the income tax provision on the consolidated statement of operations.
Reclassifications out of Accumulated Other Comprehensive Income (Loss)	Reclassifications out of AOCI for the years ended December 31, 2017 and 2016 are as follows (in millions): Amount reclassified from AOCI Affected line items on the consolidated statement of operations Year Ended December 31, AOCI Components 2017 2016 Amortization of pension, retiree medical and other postretirement benefits: Prior service benefit $ (132 ) $ (134 ) Salaries, wages and benefits Actuarial loss 77 69 Salaries, wages and benefits Total reclassifications for the period, net of tax $ (55 ) $ (65 )

Commitments, Contingencies an36

Commitments, Contingencies and Guarantees (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies [Line Items]
Long-term Purchase Commitments	Under all of our aircraft and engine purchase agreements, our total future commitments as of December 31, 2017 are expected to be as follows (approximately, in millions): 2018 2019 2020 2021 2022 2023 and Thereafter Total Payments for aircraft commitments and certain engines (1) $ 1,826 $ 2,730 $ 2,730 $ 2,858 $ 2,138 $ 1,482 $ 13,764 (1) These amounts are net of purchase deposits currently held by the manufacturers and include all commitments for regional aircraft. American has granted a security interest in its purchase deposits with Boeing. Our purchase deposits held by all manufacturers totaled $1.2 billion as of December 31, 2017 .
Future Minimum Operating Lease Payments	As of December 31, 2017 , obligations under noncancellable operating leases for future minimum lease payments are as follows (approximately, in millions): 2018 2019 2020 2021 2022 2023 and Thereafter Total Future minimum lease payments $ 2,195 $ 1,974 $ 1,784 $ 1,339 $ 1,159 $ 3,266 $ 11,717
Minimum Fixed Obligations under Capacity Purchase Agreements with Third-Party Regional Carriers	As of December 31, 2017 , American’s minimum fixed obligations under its capacity purchase agreements with third-party regional carriers are as follows (approximately, in millions): 2018 2019 2020 2021 2022 2023 and Thereafter Total Minimum fixed obligations under capacity purchase agreements with third-party regional carriers (1) $ 1,457 $ 1,311 $ 1,063 $ 866 $ 699 $ 2,073 $ 7,469 (1) Represents minimum payments under capacity purchase agreements with third-party regional carriers. These commitments are estimates of costs based on assumed minimum levels of flying under the capacity purchase agreements and American’s actual payments could differ materially. These obligations also include the portion of American’s future obligations representing the lease of aircraft for accounting purposes in the amount of approximately $377 million in 2018 , $355 million in 2019 , $320 million in 2020 , $282 million in 2021 , $239 million in 2022 and $699 million in 2023 and thereafter .
American Airlines, Inc. [Member]
Commitments and Contingencies [Line Items]
Long-term Purchase Commitments	Under all of American’s aircraft and engine purchase agreements, its total future commitments as of December 31, 2017 are expected to be as follows (approximately, in millions): 2018 2019 2020 2021 2022 2023 and Thereafter Total Payments for aircraft commitments and certain engines (1) $ 1,826 $ 2,730 $ 2,730 $ 2,858 $ 2,138 $ 1,482 $ 13,764 (1) These amounts are net of purchase deposits currently held by the manufacturers and include all commitments for regional aircraft. American has granted a security interest in its purchase deposits with Boeing. American’s purchase deposits held by all manufacturers totaled $1.2 billion as of December 31, 2017 .
Future Minimum Operating Lease Payments	As of December 31, 2017 , obligations under noncancellable operating leases for future minimum lease payments are as follows (approximately, in millions): 2018 2019 2020 2021 2022 2023 and Thereafter Total Future minimum lease payments $ 2,178 $ 1,966 $ 1,776 $ 1,331 $ 1,155 $ 3,253 $ 11,659
Minimum Fixed Obligations under Capacity Purchase Agreements with Third-Party Regional Carriers	As of December 31, 2017 , American’s minimum fixed obligations under its capacity purchase agreements with third-party regional carriers are as follows (approximately, in millions): 2018 2019 2020 2021 2022 2023 and Thereafter Total Minimum fixed obligations under capacity purchase agreements with third-party regional carriers (1) $ 1,457 $ 1,311 $ 1,063 $ 866 $ 699 $ 2,073 $ 7,469 (1) Represents minimum payments under capacity purchase agreements with third-party regional carriers. These commitments are estimates of costs based on assumed minimum levels of flying under the capacity purchase agreements and American’s actual payments could differ materially. These obligations also include the portion of American’s future obligations representing the lease of aircraft for accounting purposes in the amount of approximately $377 million in 2018 , $355 million in 2019 , $320 million in 2020 , $282 million in 2021 , $239 million in 2022 and $699 million in 2023 and thereafter .

Supplemental Cash Flow Inform37

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2017
Other Significant Noncash Transactions [Line Items]
Cash Flow Information and Non-Cash Investing and Financing Activities	Supplemental disclosure of cash flow information and non-cash investing and financing activities are as follows (in millions): Year Ended December 31, 2017 2016 2015 Non-cash investing and financing activities: Equity investment $ 120 $ — $ — Settlement of bankruptcy obligations 15 3 63 Capital lease obligations — — 5 Supplemental information: Interest paid, net 1,040 964 873 Income taxes paid 20 16 20
American Airlines, Inc. [Member]
Other Significant Noncash Transactions [Line Items]
Cash Flow Information and Non-Cash Investing and Financing Activities	Supplemental disclosure of cash flow information and non-cash investing and financing activities are as follows (in millions): Year Ended December 31, 2017 2016 2015 Non-cash investing and financing activities: Equity investment $ 120 $ — $ — Settlement of bankruptcy obligations 15 3 63 Capital lease obligations — — 5 Supplemental information: Interest paid, net 942 867 787 Income taxes paid 18 14 19

Operating Segments and Relate38

Operating Segments and Related Disclosures (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting Information [Line Items]
Operating Revenues by Geographic Region	Our operating revenues by geographic region as defined by the U.S. Department of Transportation (DOT) are summarized below (in millions): Year Ended December 31, 2017 2016 2015 DOT Domestic $ 29,612 $ 28,620 $ 28,761 DOT Latin America 5,422 4,995 5,539 DOT Atlantic 5,059 4,769 5,146 DOT Pacific 2,114 1,796 1,544 Total operating revenues $ 42,207 $ 40,180 $ 40,990
American Airlines, Inc. [Member]
Segment Reporting Information [Line Items]
Operating Revenues by Geographic Region	American’s operating revenues by geographic region as defined by the U.S. Department of Transportation (DOT) are summarized below (in millions): Year Ended December 31, 2017 2016 2015 DOT Domestic $ 29,600 $ 28,603 $ 28,709 DOT Latin America 5,422 4,995 5,539 DOT Atlantic 5,059 4,769 5,146 DOT Pacific 2,114 1,796 1,544 Total operating revenues $ 42,195 $ 40,163 $ 40,938

Share-based Compensation (Table

Share-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Stock-Settled RSU Award Activity	Stock-settled RSU award activity for all plans for the years ended December 31, 2017 , 2016 and 2015 is as follows: Number of Shares Weighted Average Grant Date Fair Value (In thousands) Outstanding at December 31, 2014 21,342 $ 26.43 Granted 2,213 46.62 Vested and released (17,163 ) 25.20 Forfeited (785 ) 27.12 Outstanding at December 31, 2015 5,607 $ 38.08 Granted 2,655 41.34 Vested and released (2,754 ) 34.83 Forfeited (321 ) 40.15 Outstanding at December 31, 2016 5,187 $ 41.48 Granted 2,309 48.58 Vested and released (2,708 ) 39.63 Forfeited (464 ) 44.48 Outstanding at December 31, 2017 4,324 $ 46.94
American Airlines, Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Stock-Settled RSU Award Activity	Stock-settled RSU award activity for all plans for the years ended December 31, 2017 , 2016 and 2015 is as follows: Number of Shares Weighted Average Grant Date Fair Value (In thousands) Outstanding at December 31, 2014 21,342 $ 26.43 Granted 2,213 46.62 Vested and released (17,163 ) 25.20 Forfeited (785 ) 27.12 Outstanding at December 31, 2015 5,607 $ 38.08 Granted 2,655 41.34 Vested and released (2,754 ) 34.83 Forfeited (321 ) 40.15 Outstanding at December 31, 2016 5,187 $ 41.48 Granted 2,309 48.58 Vested and released (2,708 ) 39.63 Forfeited (464 ) 44.48 Outstanding at December 31, 2017 4,324 $ 46.94

Valuation and Qualifying Acco40

Valuation and Qualifying Accounts (Tables)	12 Months Ended
	Dec. 31, 2017
Valuation and Qualifying Accounts Disclosure [Line Items]
Components of Valuation and Qualifying Accounts	Balance at Beginning of Year Changes Charged to Statement of Operations Accounts Write-offs (Net of Recoveries) Sales, Retirements and Transfers Balance at End of Year Allowance for obsolescence of spare parts Year ended December 31, 2017 $ 765 $ 29 $ (4 ) $ (21 ) $ 769 Year ended December 31, 2016 728 37 (3 ) 3 765 Year ended December 31, 2015 673 50 (4 ) 9 728 Allowance for uncollectible accounts Year ended December 31, 2017 $ 36 $ 43 $ (55 ) $ — $ 24 Year ended December 31, 2016 41 47 (52 ) — 36 Year ended December 31, 2015 17 46 (22 ) — 41
American Airlines, Inc. [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Components of Valuation and Qualifying Accounts	Balance at Beginning of Year Changes Charged to Statement of Operations Accounts Write-offs (Net of Recoveries) Sales, Retirements and Transfers Balance at End of Year Allowance for obsolescence of spare parts Year ended December 31, 2017 $ 720 $ 18 $ — $ (21 ) $ 717 Year ended December 31, 2016 689 28 — 3 720 Year ended December 31, 2015 638 42 — 9 689 Allowance for uncollectible accounts Year ended December 31, 2017 $ 35 $ 41 $ (55 ) $ — $ 21 Year ended December 31, 2016 37 47 (49 ) — 35 Year ended December 31, 2015 14 45 (22 ) — 37

Quarterly Financial Data (Una41

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Selected Quarterly Financial Information [Line Items]
Summarized Financial Data	Unaudited summarized financial data by quarter for 2017 and 2016 (in millions, except share and per share amounts): First Quarter Second Quarter Third Quarter Fourth Quarter 2017 Operating revenues $ 9,624 $ 11,105 $ 10,878 $ 10,600 Operating expenses 9,023 9,570 9,646 9,910 Operating income 601 1,535 1,232 690 Net income 234 803 624 258 Earnings per share: Basic $ 0.46 $ 1.64 $ 1.29 $ 0.54 Diluted $ 0.46 $ 1.63 $ 1.28 $ 0.54 Shares used for computation (in thousands): Basic 503,902 490,818 484,772 477,165 Diluted 507,797 492,965 486,625 479,382 2016 Operating revenues $ 9,435 $ 10,363 $ 10,594 $ 9,789 Operating expenses 8,100 8,612 9,163 9,022 Operating income 1,335 1,751 1,431 767 Net income 700 950 737 289 Earnings per share: Basic $ 1.15 $ 1.69 $ 1.40 $ 0.56 Diluted $ 1.14 $ 1.68 $ 1.40 $ 0.56 Shares used for computation (in thousands): Basic 606,245 563,000 525,415 514,571 Diluted 611,488 566,040 528,510 518,358
American Airlines, Inc. [Member]
Selected Quarterly Financial Information [Line Items]
Summarized Financial Data	Unaudited summarized financial data by quarter for 2017 and 2016 (in millions): First Quarter Second Quarter Third Quarter Fourth Quarter 2017 Operating revenues $ 9,621 $ 11,102 $ 10,875 $ 10,597 Operating expenses 9,017 9,575 9,650 9,921 Operating income 604 1,527 1,225 676 Net income 263 827 649 183 2016 Operating revenues $ 9,427 $ 10,360 $ 10,591 $ 9,786 Operating expenses 8,104 8,603 9,159 8,995 Operating income 1,323 1,757 1,432 791 Net income 710 972 758 341

Transactions with Related Par42

Transactions with Related Parties (Tables)	12 Months Ended
	Dec. 31, 2017
American Airlines, Inc. [Member]
Related Party Transaction [Line Items]
Summary of Net Receivables (Payables) to Related Parties	The following represents the net receivables (payables) to related parties (in millions): December 31, 2017 2016 AAG (1) $ 10,968 $ 8,981 AAG’s wholly-owned subsidiaries (2) (2,146 ) (2,171 ) Total $ 8,822 $ 6,810 (1) The increase in American’s net related party receivable from AAG is primarily due to American providing the cash funding for AAG’s share repurchase and dividend programs. (2) The net payable to AAG’s wholly-owned subsidiaries consists primarily of amounts due under regional capacity purchase agreements with AAG’s wholly-owned regional airlines operating under the brand name of American Eagle.

Basis of Presentation and Sum43

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Dec. 31, 2015USD ($)	Dec. 31, 2017USD ($)Reporting_Unit$ / shares	Dec. 31, 2016USD ($)$ / shares	Dec. 31, 2015USD ($)
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Document Fiscal Year Focus		2,017
Common stock, par value (in dollars per share) | $ / shares		$ 0.01	$ 0.01
Consolidated reporting unit | Reporting_Unit		1
Goodwill		$ 4,091,000,000	$ 4,091,000,000
Amortization expense		44,000,000	76,000,000	$ 55,000,000
Indefinite lived intangible assets		1,900,000,000	1,800,000,000
Impairment of intangible assets, indefinite-lived (excluding goodwill)		0
Current loyalty program liability		2,791,000,000	2,789,000,000
Air traffic liability		3,978,000,000	3,912,000,000
Advertising and promotional expenses		135,000,000	116,000,000	110,000,000
Foreign currency gains (losses)		(4,000,000)	1,000,000	(751,000,000)
Mileage Credits Sale [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Current loyalty program liability		2,100,000,000	2,100,000,000
Marketing Component of Mileage Sales [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Other revenues recognized for marketing component of mileage sales at the time of sale		2,200,000,000	1,900,000,000	1,700,000,000
AAdvantage Program [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Current loyalty program liability		$ 677,000,000	$ 669,000,000
Venezuelan [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Venezuela foreign currency losses				592,000,000
Gate Leasehold Rights [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Amortized years of intangible assets		25 years
Domestic Airport Slots [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Amortized years of intangible assets		25 years
Customer Relationships [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Amortized years of intangible assets		9 years
Marketing Agreements [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Amortized years of intangible assets		30 years
American Airlines, Inc. [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Document Fiscal Year Focus		2,017
Common stock, par value (in dollars per share) | $ / shares		$ 1	$ 1
Consolidated reporting unit | Reporting_Unit		1
Goodwill		$ 4,091,000,000	$ 4,091,000,000
Amortization expense		44,000,000	76,000,000	55,000,000
Indefinite lived intangible assets		1,900,000,000	1,800,000,000
Impairment of intangible assets, indefinite-lived (excluding goodwill)		0
Current loyalty program liability		2,791,000,000	2,789,000,000
Air traffic liability		3,978,000,000	3,912,000,000
Advertising and promotional expenses		135,000,000	116,000,000	110,000,000
Foreign currency gains (losses)		(4,000,000)	1,000,000	(751,000,000)
American Airlines, Inc. [Member] | Mileage Credits Sale [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Current loyalty program liability		2,100,000,000	2,100,000,000
American Airlines, Inc. [Member] | Marketing Component of Mileage Sales [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Other revenues recognized for marketing component of mileage sales at the time of sale		2,200,000,000	1,900,000,000	$ 1,700,000,000
American Airlines, Inc. [Member] | AAdvantage Program [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Current loyalty program liability		$ 677,000,000	$ 669,000,000
American Airlines, Inc. [Member] | Venezuelan [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Venezuela foreign currency losses	$ 592,000,000
American Airlines, Inc. [Member] | Gate Leasehold Rights [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Amortized years of intangible assets		25 years
American Airlines, Inc. [Member] | Domestic Airport Slots [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Amortized years of intangible assets		25 years
American Airlines, Inc. [Member] | Customer Relationships [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Amortized years of intangible assets		9 years
American Airlines, Inc. [Member] | Marketing Agreements [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Amortized years of intangible assets		30 years

Basis of Presentation and Sum44

Basis of Presentation and Summary of Significant Accounting Policies - Operating Property and Equipment (Detail) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Depreciation	$ 2.2	$ 1.9	$ 1.7
Minimum [Member] | Aircraft, Engines and Related Rotable Parts [Member]
Property, Plant and Equipment [Line Items]
Residual value percentage of equipment and properties	5.00%
Depreciable Life	20 years
Minimum [Member] | Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
Minimum [Member] | Furniture, Fixtures and Other Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	3 years
Minimum [Member] | Capitalized Software [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
Maximum [Member] | Aircraft, Engines and Related Rotable Parts [Member]
Property, Plant and Equipment [Line Items]
Residual value percentage of equipment and properties	10.00%
Depreciable Life	30 years
Maximum [Member] | Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	30 years
Maximum [Member] | Furniture, Fixtures and Other Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	10 years
Maximum [Member] | Capitalized Software [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	10 years
American Airlines, Inc. [Member]
Property, Plant and Equipment [Line Items]
Depreciation	$ 2.1	$ 1.8	$ 1.6
American Airlines, Inc. [Member] | Minimum [Member] | Aircraft, Engines and Related Rotable Parts [Member]
Property, Plant and Equipment [Line Items]
Residual value percentage of equipment and properties	5.00%
Depreciable Life	20 years
American Airlines, Inc. [Member] | Minimum [Member] | Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
American Airlines, Inc. [Member] | Minimum [Member] | Furniture, Fixtures and Other Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	3 years
American Airlines, Inc. [Member] | Minimum [Member] | Capitalized Software [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	5 years
American Airlines, Inc. [Member] | Maximum [Member] | Aircraft, Engines and Related Rotable Parts [Member]
Property, Plant and Equipment [Line Items]
Residual value percentage of equipment and properties	10.00%
Depreciable Life	30 years
American Airlines, Inc. [Member] | Maximum [Member] | Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	30 years
American Airlines, Inc. [Member] | Maximum [Member] | Furniture, Fixtures and Other Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	10 years
American Airlines, Inc. [Member] | Maximum [Member] | Capitalized Software [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life	10 years

Basis of Presentation and Sum45

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Amortizable Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	$ (622)	$ (578)
Total	320	364
American Airlines, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	(622)	(578)
Total	320	364
Domestic Airport Slots [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	365	365
Domestic Airport Slots [Member] | American Airlines, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	365	365
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	300	300
Customer Relationships [Member] | American Airlines, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	300	300
Marketing Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	105	105
Marketing Agreements [Member] | American Airlines, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	105	105
Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	35	35
Tradenames [Member] | American Airlines, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	35	35
Airport Gate Leasehold Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	137	137
Airport Gate Leasehold Rights [Member] | American Airlines, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 137	$ 137

Basis of Presentation and Sum46

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Future Amortization Expense (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
2,018	$ 41
2,019	41
2,020	41
2,021	41
2,022	41
2023 and thereafter	115
Total	320	$ 364
American Airlines, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
2,018	41
2,019	41
2,020	41
2,021	41
2,022	41
2023 and thereafter	115
Total	$ 320	$ 364

Basis of Presentation and Sum47

Basis of Presentation and Summary of Significant Accounting Policies - Regional Expenses (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Regional Expenses [Line Items]
Aircraft fuel and related taxes	$ 6,128	$ 5,071	$ 6,226
Salaries, wages and benefits	11,816	10,890	9,524
Maintenance, materials and repairs	1,959	1,834	1,889
Other rent and landing fees	1,806	1,772	1,731
Aircraft rent	1,197	1,203	1,250
Selling expenses	1,477	1,323	1,394
Depreciation and amortization	1,702	1,525	1,364
Other	4,806	4,525	4,374
Total regional expenses	6,546	6,044	5,983
Regional Carrier [Member]
Regional Expenses [Line Items]
Aircraft fuel and related taxes	1,382	1,109	1,230
Salaries, wages and benefits	1,452	1,333	1,187
Capacity purchases from third-party regional carriers	1,581	1,538	1,651
Maintenance, materials and repairs	281	345	323
Other rent and landing fees	625	564	504
Aircraft rent	35	36	34
Selling expenses	361	347	333
Depreciation and amortization	315	301	252
Special items, net	22	14	29
Other	492	457	440
Total regional expenses	6,546	6,044	5,983
Capacity purchase expenses related to aircraft deemed to be leased	437	405	492
American Airlines, Inc. [Member]
Regional Expenses [Line Items]
Aircraft fuel and related taxes	6,128	5,071	6,226
Salaries, wages and benefits	11,804	10,881	9,514
Maintenance, materials and repairs	1,959	1,834	1,889
Other rent and landing fees	1,806	1,772	1,731
Aircraft rent	1,197	1,203	1,250
Selling expenses	1,477	1,323	1,394
Depreciation and amortization	1,702	1,525	1,364
Other	4,806	4,532	4,378
Total regional expenses	6,572	6,009	5,952
American Airlines, Inc. [Member] | Regional Carrier [Member]
Regional Expenses [Line Items]
Aircraft fuel and related taxes	1,382	1,109	1,230
Salaries, wages and benefits	356	327	276
Capacity purchases from third-party regional carriers	3,283	3,186	3,137
Maintenance, materials and repairs	7	4	4
Other rent and landing fees	602	487	434
Aircraft rent	27	28	28
Selling expenses	361	347	333
Depreciation and amortization	262	237	197
Special items, net	3	13	18
Other	289	271	295
Total regional expenses	6,572	6,009	5,952
Capacity purchase expenses related to aircraft deemed to be leased	$ 437	$ 405	$ 492

Basis of Presentation and Sum48

Basis of Presentation and Summary of Significant Accounting Policies - New Accounting Standards (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Passenger									$ 36,133
Cargo									800	$ 700	$ 760
Other									5,274	4,901	4,718
Total operating revenues	$ 10,600	$ 10,878	$ 11,105	$ 9,624	$ 9,789	$ 10,594	$ 10,363	$ 9,435	42,207	40,180	40,990
Total operating expenses	9,910	9,646	9,570	9,023	9,022	9,163	8,612	8,100	38,149	34,896	34,786
Operating income	690	1,232	1,535	601	767	1,431	1,751	1,335	4,058	5,284	6,204
Total nonoperating expense, net									(974)	(985)	(1,588)
Income before income taxes									3,084	4,299	4,616
Income tax provision (benefit)									1,165	1,623	(2,994)
Net income	$ 258	$ 624	$ 803	$ 234	$ 289	$ 737	$ 950	$ 700	$ 1,919	$ 2,676	$ 7,610
Diluted (in dollars per share)	$ 0.54	$ 1.28	$ 1.63	$ 0.46	$ 0.56	$ 1.40	$ 1.68	$ 1.14	$ 3.90	$ 4.81	$ 11.07
Deferred tax asset	$ 427				$ 1,498				$ 427	$ 1,498
Air traffic liability	3,978				3,912				3,978	3,912
Current loyalty program liability	2,791				2,789				2,791	2,789
Noncurrent loyalty program liability	0								0
Total stockholders’ equity (deficit)	3,926				3,785				3,926	3,785	$ 5,635	$ 2,021
Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax asset	1,816								1,816
Air traffic liability	4,042								4,042
Current loyalty program liability	3,175								3,175
Noncurrent loyalty program liability	5,647								5,647
Total stockholders’ equity (deficit)	(780)								(780)
Restatement Adjustment [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax asset	1,389								1,389
Air traffic liability	64								64
Current loyalty program liability	384								384
Noncurrent loyalty program liability	5,647								5,647
Total stockholders’ equity (deficit)	(4,706)								(4,706)
Pro Forma [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Passenger									39,131
Cargo									890
Other									2,601
Total operating revenues									42,622
Total operating expenses									38,391
Operating income									4,231
Total nonoperating expense, net									(836)
Income before income taxes									3,395
Income tax provision (benefit)									2,113
Net income									$ 1,282
Diluted (in dollars per share)									$ 2.61
Pro Forma and Restatement Adjustment [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Passenger									$ 2,687
Cargo									90
Other									(2,673)
Total operating revenues									104
Total operating expenses									104
Pro Forma and Restatement Adjustment [Member] | Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total operating expenses									138
Operating income									(138)
Total nonoperating expense, net									138
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Pro Forma [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Passenger									311
Total operating revenues									311
Operating income									311
Income before income taxes									311
Income tax provision (benefit)									948
Net income									(637)
Change in valuation allowance									830
American Airlines, Inc. [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Passenger									36,133
Cargo									800	700	760
Other									5,262	4,884	4,666
Total operating revenues	10,597	$ 10,875	$ 11,102	$ 9,621	9,786	$ 10,591	$ 10,360	$ 9,427	42,195	40,163	40,938
Total operating expenses	9,921	9,650	9,575	9,017	8,995	9,159	8,603	8,104	38,163	34,859	34,749
Operating income	676	1,225	1,527	604	791	1,432	1,757	1,323	4,032	5,304	6,189
Total nonoperating expense, net									(788)	(861)	(1,521)
Income before income taxes									3,244	4,443	4,668
Income tax provision (benefit)									1,322	1,662	(3,452)
Net income	183	$ 649	$ 827	$ 263	341	$ 758	$ 972	$ 710	1,922	2,781	8,120
Change in valuation allowance									830
Deferred tax asset	682				1,912				682	1,912
Air traffic liability	3,978				3,912				3,978	3,912
Current loyalty program liability	2,791				2,789				2,791	2,789
Noncurrent loyalty program liability	0								0
Total stockholders’ equity (deficit)	14,594				$ 12,649				14,594	$ 12,649	$ 9,698	$ 1,406
American Airlines, Inc. [Member] | Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax asset	2,071								2,071
Air traffic liability	4,042								4,042
Current loyalty program liability	3,175								3,175
Noncurrent loyalty program liability	5,647								5,647
Total stockholders’ equity (deficit)	9,888								9,888
American Airlines, Inc. [Member] | Restatement Adjustment [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax asset	1,389								1,389
Air traffic liability	64								64
Current loyalty program liability	384								384
Noncurrent loyalty program liability	5,647								5,647
Total stockholders’ equity (deficit)	$ (4,706)								(4,706)
American Airlines, Inc. [Member] | Pro Forma [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Passenger									39,131
Cargo									890
Other									2,589
Total operating revenues									42,610
Total operating expenses									38,405
Operating income									4,205
Total nonoperating expense, net									(650)
Income before income taxes									3,555
Income tax provision (benefit)									2,270
Net income									1,285
American Airlines, Inc. [Member] | Pro Forma and Restatement Adjustment [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Passenger									2,687
Cargo									90
Other									(2,673)
Total operating revenues									104
Total operating expenses									104
American Airlines, Inc. [Member] | Pro Forma and Restatement Adjustment [Member] | Accounting Standards Update 2017-07 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total operating expenses									138
Operating income									(138)
Total nonoperating expense, net									138
American Airlines, Inc. [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Pro Forma [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Passenger									311
Total operating revenues									311
Operating income									311
Income before income taxes									311
Income tax provision (benefit)									948
Net income									$ (637)

Special Items - Components of S

Special Items - Components of Special Items, Net Included in Consolidated Statements of Operations (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Merger integration expenses	$ 81	$ 121	$ 273	$ 514	$ 826
Fleet restructuring expenses	58	104	232	177	210
Employee 2017 Tax Act bonus expense	149
Labor contract expenses			46	0	0
Mark-to-market adjustments for bankruptcy obligations			27	25	(53)
Other operating charges (credits), net			11	(7)	68
Special items, net			712	709	1,051
Regional operating special items, net			22	14	29
Operating special items, net			734	723	1,080
Debt refinancing and extinguishment charges			22	49	24
Venezuela foreign currency losses			0	0	592
Other nonoperating charges (credits), net			0	0	(22)
Nonoperating special items, net			22	49	594
Impact of the 2017 Tax Act on deferred tax assets and liabilities	(7)		(7)	0	0
Release of deferred tax valuation allowance			0	0	(3,040)
Other tax charges			0	0	25
Income tax special items, net			(7)	0	(3,015)
Mainline [Member]
Restructuring Cost and Reserve [Line Items]
Employee 2017 Tax Act bonus expense			123	0	0
American Airlines, Inc. [Member]
Restructuring Cost and Reserve [Line Items]
Merger integration expenses	81	121	273	514	826
Fleet restructuring expenses	58	$ 104	232	177	210
Employee 2017 Tax Act bonus expense	123
Labor contract expenses			46	0	0
Mark-to-market adjustments for bankruptcy obligations			27	25	(53)
Other operating charges (credits), net			11	(7)	68
Special items, net			712	709	1,051
Regional operating special items, net			3	13	18
Operating special items, net			715	722	1,069
Debt refinancing and extinguishment charges			22	49	24
Venezuela foreign currency losses			0	0	592
Nonoperating special items, net			22	49	616
Impact of the 2017 Tax Act on deferred tax assets and liabilities	$ 93		93	0	0
Release of deferred tax valuation allowance			0	0	(3,493)
Other tax charges			0	0	25
Income tax special items, net			93	0	(3,468)
American Airlines, Inc. [Member] | Mainline [Member]
Restructuring Cost and Reserve [Line Items]
Employee 2017 Tax Act bonus expense			$ 123	$ 0	$ 0

Special Items - Additional Disc

Special Items - Additional Disclosures (Detail) - $ / Employees	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Tax reform bonus, amount per employee	1,000
Mainline [Member]
Restructuring Cost and Reserve [Line Items]
Tax reform bonus, amount per employee		1,000
American Airlines, Inc. [Member]
Restructuring Cost and Reserve [Line Items]
Tax reform bonus, amount per employee	1,000
American Airlines, Inc. [Member] | Mainline [Member]
Restructuring Cost and Reserve [Line Items]
Tax reform bonus, amount per employee		1,000

Earnings (Loss) per Share - Com

Earnings (Loss) per Share - Computation of Basic and Diluted Earnings per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Basic EPS:
Net income	$ 258	$ 624	$ 803	$ 234	$ 289	$ 737	$ 950	$ 700	$ 1,919	$ 2,676	$ 7,610
Weighted average common shares outstanding	477,165	484,772	490,818	503,902	514,571	525,415	563,000	606,245	489,164	552,308	668,393
Basic EPS (in dollars per share)	$ 0.54	$ 1.29	$ 1.64	$ 0.46	$ 0.56	$ 1.40	$ 1.69	$ 1.15	$ 3.92	$ 4.85	$ 11.39
Diluted EPS:
Net income for purposes of computing diluted EPS									$ 1,919	$ 2,676	$ 7,610
Share computation for diluted EPS (in thousands):
Basic weighted average common shares outstanding	477,165	484,772	490,818	503,902	514,571	525,415	563,000	606,245	489,164	552,308	668,393
Dilutive effect of stock awards									2,528	3,791	18,962
Diluted weighted average common shares outstanding	479,382	486,625	492,965	507,797	518,358	528,510	566,040	611,488	491,692	556,099	687,355
Diluted EPS (in dollars per share)	$ 0.54	$ 1.28	$ 1.63	$ 0.46	$ 0.56	$ 1.40	$ 1.68	$ 1.14	$ 3.90	$ 4.81	$ 11.07
Restricted stock unit awards excluded from the calculation of diluted EPS because inclusion would be antidilutive									328	1,429	764

Share Repurchase Programs and52

Share Repurchase Programs and Dividends - Share Repurchase Programs (Detail) - USD ($)	12 Months Ended			42 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Equity [Abstract]
Stock repurchase programs, authorized amount	$ 11,000,000,000			$ 11,000,000,000
Stock repurchase programs, remaining authorized amount	$ 450,000,000			$ 450,000,000
Stock repurchased (in shares)	33,900,000	119,823,621	85,141,691	262,300,000
Aggregate stock repurchase price	$ 1,563,000,000	$ 4,416,000,000	$ 3,586,000,000	$ 10,600,000,000
Average cost per share (in dollars per share)	$ 45.68	$ 36.86	$ 42.09	$ 40.22

Share Repurchase Programs and53

Share Repurchase Programs and Dividends - Dividends (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended												12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.10	$ 0.1	$ 0.1	$ 0.1	$ 0.1	$ 0.1	$ 0.1	$ 0.1	$ 0.1	$ 0.1	$ 0.1	$ 0.1	$ 0.40	$ 0.40	$ 0.40
Cash paid													$ 198	$ 224	$ 269

Debt - Components of Long-Term

Debt - Components of Long-Term Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 25,301	$ 24,573
Less: Total unamortized debt discount, premium and issuance costs	236	229
Current maturities of long-term debt and capital leases	2,554	1,855
Long-term debt and capital lease obligations, net of current maturities	22,511	22,489
Secured Debt [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	23,551	22,823
Secured Debt [Member] | Credit Facility 2013 [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 1,825	1,843
Interest rate	3.55%
Secured Debt [Member] | Credit Facility 2014 [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 728	735
Interest rate	3.43%
Secured Debt [Member] | April 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 990	1,000
Interest rate	3.57%
Secured Debt [Member] | December 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 1,238	1,250
Interest rate	3.48%
Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 11,881	10,912
Average interest rate	4.30%
Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	3.00%
Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	9.75%
Secured Debt [Member] | Equipment Loans and Other Notes Payable [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 5,259	5,343
Average interest rate	3.29%
Secured Debt [Member] | Equipment Loans and Other Notes Payable [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	2.34%
Secured Debt [Member] | Equipment Loans and Other Notes Payable [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	8.48%
Secured Debt [Member] | Special Facility Revenue Bonds [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 857	891
Secured Debt [Member] | Special Facility Revenue Bonds [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	5.00%
Secured Debt [Member] | Special Facility Revenue Bonds [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	8.00%
Secured Debt [Member] | Other Secured Obligations [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 773	849
Secured Debt [Member] | Other Secured Obligations [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	3.81%
Secured Debt [Member] | Other Secured Obligations [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	12.24%
Unsecured Debt [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 1,750	1,750
Unsecured Debt [Member] | Senior Notes 6.125% Due in 2018 [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 500	500
Interest rate	6.125%
Unsecured Debt [Member] | Senior Notes 5.50% Due in 2019 [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 750	750
Interest rate	5.50%
Unsecured Debt [Member] | Senior Notes 4.625% Due in 2020 [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 500	500
Interest rate	4.625%
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Less: Total unamortized debt discount, premium and issuance costs	$ 227	216
Current maturities of long-term debt and capital leases	2,058	1,859
Long-term debt and capital lease obligations, net of current maturities	21,236	20,718
American Airlines, Inc. [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	23,521	22,793
American Airlines, Inc. [Member] | Secured Debt [Member] | Credit Facility 2013 [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 1,825	1,843
Interest rate	3.55%
American Airlines, Inc. [Member] | Secured Debt [Member] | Credit Facility 2014 [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 728	735
Interest rate	3.43%
American Airlines, Inc. [Member] | Secured Debt [Member] | April 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 990	1,000
Interest rate	3.57%
American Airlines, Inc. [Member] | Secured Debt [Member] | December 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 1,238	1,250
Interest rate	3.48%
American Airlines, Inc. [Member] | Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 11,881	10,912
Average interest rate	4.30%
American Airlines, Inc. [Member] | Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	3.00%
American Airlines, Inc. [Member] | Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	9.75%
American Airlines, Inc. [Member] | Secured Debt [Member] | Equipment Loans and Other Notes Payable [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 5,259	5,343
Average interest rate	3.29%
American Airlines, Inc. [Member] | Secured Debt [Member] | Equipment Loans and Other Notes Payable [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	2.34%
American Airlines, Inc. [Member] | Secured Debt [Member] | Equipment Loans and Other Notes Payable [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	8.48%
American Airlines, Inc. [Member] | Secured Debt [Member] | Special Facility Revenue Bonds [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 828	862
American Airlines, Inc. [Member] | Secured Debt [Member] | Special Facility Revenue Bonds [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	5.00%
American Airlines, Inc. [Member] | Secured Debt [Member] | Special Facility Revenue Bonds [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	5.50%
American Airlines, Inc. [Member] | Secured Debt [Member] | Other Secured Obligations [Member]
Debt Instrument [Line Items]
Total long-term debt and capital lease obligations	$ 772	$ 848
American Airlines, Inc. [Member] | Secured Debt [Member] | Other Secured Obligations [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate	3.81%
American Airlines, Inc. [Member] | Secured Debt [Member] | Other Secured Obligations [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate	12.24%

Debt - Summary of Availability

Debt - Summary of Availability under Revolving Credit Facilities (Detail) - Secured Debt [Member] - Revolving Credit Facility [Member] - USD ($)	Dec. 31, 2017	Aug. 31, 2017	Jun. 30, 2017	Mar. 31, 2017
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 2,500,000,000
Credit Facility 2013 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	1,200,000,000	$ 1,200,000,000		$ 1,400,000,000
Credit Facility 2014 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	1,000,000,000	1,000,000,000	$ 1,025,000,000
April 2016 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	300,000,000	300,000,000
American Airlines, Inc. [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	2,500,000,000
American Airlines, Inc. [Member] | Credit Facility 2013 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	1,200,000,000	1,200,000,000		$ 1,400,000,000
American Airlines, Inc. [Member] | Credit Facility 2014 [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	1,000,000,000	1,000,000,000	$ 1,025,000,000
American Airlines, Inc. [Member] | April 2016 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 300,000,000	$ 300,000,000

Debt - Additional Information (

Debt - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017AircraftTransactions
Debt Instrument [Line Items]
Number of jet aircraft committed to capital leases | Aircraft	33
Collateral coverage tests, number of financing transactions | Transactions	4
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Number of jet aircraft committed to capital leases | Aircraft	33
Collateral coverage tests, number of financing transactions | Transactions	4

Debt - Schedule of Maturities o

Debt - Schedule of Maturities of Long-Term Debt and Capital Leases (Detail) $ in Millions	Dec. 31, 2017USD ($)
Debt Instrument [Line Items]
2,018	$ 2,598
2,019	2,868
2,020	4,069
2,021	2,856
2,022	1,288
2023 and thereafter	11,622
Total	25,301
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
2,018	2,098
2,019	2,118
2,020	3,563
2,021	2,854
2,022	1,286
2023 and thereafter	11,602
Total	$ 23,521

Debt - 2013, 2014 and 2016 Cred

Debt - 2013, 2014 and 2016 Credit Facilities (Detail) - USD ($)	Nov. 30, 2017	Nov. 29, 2017	Aug. 31, 2017	Aug. 30, 2017	Jun. 30, 2017	Jun. 29, 2017	Mar. 31, 2017	Mar. 30, 2017	Aug. 31, 2017	Dec. 31, 2017
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility undrawn fee percentage										0.75%
Secured Debt [Member]
Debt Instrument [Line Items]
Minimum aggregate liquidity required under debt covenant										$ 2,000,000,000
Secured Debt [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Annual installment repayment, percent or original principal balance										1.00%
Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2013 [Member]
Debt Instrument [Line Items]
Debt instrument principal amount										$ 1,900,000,000
Long-term debt outstanding							$ 1,800,000,000			$ 1,825,000,000
Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2013 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate							2.00%	2.50%		2.00%
Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2013 [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate							1.00%	1.50%
Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2014 [Member]
Debt Instrument [Line Items]
Debt instrument principal amount										$ 750,000,000
Long-term debt outstanding					$ 735,000,000					$ 728,000,000
Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2014 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate					2.00%	2.50%				2.00%
Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2014 [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate					1.00%	1.50%
Secured Debt [Member] | Term Loan Facility [Member] | April 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
Debt instrument principal amount										$ 1,000,000,000
Long-term debt outstanding	$ 990,000,000									$ 990,000,000
Secured Debt [Member] | Term Loan Facility [Member] | April 2016 Credit Facilities [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%	2.50%								2.00%
Secured Debt [Member] | Term Loan Facility [Member] | April 2016 Credit Facilities [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%	1.50%
Secured Debt [Member] | Term Loan Facility [Member] | December 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
Debt instrument principal amount										$ 1,250,000,000
Long-term debt outstanding	$ 1,250,000,000									$ 1,238,000,000
Secured Debt [Member] | Term Loan Facility [Member] | December 2016 Credit Facilities [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%	2.50%								2.00%
Secured Debt [Member] | Term Loan Facility [Member] | December 2016 Credit Facilities [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%	1.50%
Secured Debt [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity										$ 2,500,000,000
Secured Debt [Member] | Revolving Credit Facility [Member] | Credit Facility 2013 [Member]
Debt Instrument [Line Items]
Long-term debt outstanding										0
Line of credit facility, maximum borrowing capacity			$ 1,200,000,000				$ 1,400,000,000		$ 1,200,000,000	$ 1,200,000,000
Secured Debt [Member] | Revolving Credit Facility [Member] | Credit Facility 2013 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			2.25%	3.00%						2.25%
Secured Debt [Member] | Revolving Credit Facility [Member] | Credit Facility 2014 [Member]
Debt Instrument [Line Items]
Long-term debt outstanding										$ 0
Line of credit facility, maximum borrowing capacity			$ 1,000,000,000		$ 1,025,000,000				1,000,000,000	$ 1,000,000,000
Secured Debt [Member] | Revolving Credit Facility [Member] | Credit Facility 2014 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			2.25%	3.00%						2.25%
Secured Debt [Member] | Revolving Credit Facility [Member] | April 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
Long-term debt outstanding										$ 0
Line of credit facility, maximum borrowing capacity			$ 300,000,000						$ 300,000,000	$ 300,000,000
Secured Debt [Member] | Revolving Credit Facility [Member] | April 2016 Credit Facilities [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate									2.25%	2.25%
Secured Debt [Member] | Letter of Credit [Member] | Credit Facility 2013 [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity										$ 150,000,000
Secured Debt [Member] | Letter of Credit [Member] | Credit Facility 2014 [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity										$ 300,000,000
American Airlines, Inc. [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility undrawn fee percentage										0.75%
American Airlines, Inc. [Member] | Revolving Credit Facility [Member] | Credit Facility 2014 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			2.25%	3.00%
American Airlines, Inc. [Member] | Revolving Credit Facility [Member] | April 2016 Credit Facilities [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate									2.25%
American Airlines, Inc. [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Minimum aggregate liquidity required under debt covenant										$ 2,000,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Annual installment repayment, percent or original principal balance										1.00%
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2013 [Member]
Debt Instrument [Line Items]
Long-term debt outstanding							$ 1,800,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2013 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument principal amount										$ 1,900,000,000
Long-term debt outstanding										$ 1,825,000,000
Basis spread on variable rate							2.00%	2.50%		2.00%
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2013 [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate							1.00%	1.50%
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2014 [Member]
Debt Instrument [Line Items]
Long-term debt outstanding					$ 735,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2014 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument principal amount										$ 750,000,000
Long-term debt outstanding										$ 728,000,000
Basis spread on variable rate					2.00%	2.50%				2.00%
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | Credit Facility 2014 [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate					1.00%	1.50%
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | April 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
Long-term debt outstanding	$ 990,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | April 2016 Credit Facilities [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument principal amount										$ 1,000,000,000
Long-term debt outstanding										$ 990,000,000
Basis spread on variable rate	2.00%	2.50%								2.00%
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | April 2016 Credit Facilities [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%	1.50%
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | December 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
Long-term debt outstanding	$ 1,250,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | December 2016 Credit Facilities [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument principal amount										$ 1,250,000,000
Long-term debt outstanding										$ 1,238,000,000
Basis spread on variable rate	2.00%	2.50%								2.00%
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | December 2016 Credit Facilities [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%	1.50%
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity										$ 2,500,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | Credit Facility 2013 [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 1,200,000,000				$ 1,400,000,000		$ 1,200,000,000	1,200,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | Credit Facility 2013 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Long-term debt outstanding										$ 0
Basis spread on variable rate			2.25%	3.00%						2.25%
Line of credit facility, maximum borrowing capacity										$ 1,200,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | Credit Facility 2014 [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 1,000,000,000		$ 1,025,000,000				1,000,000,000	1,000,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | Credit Facility 2014 [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Long-term debt outstanding										$ 0
Basis spread on variable rate										2.25%
Line of credit facility, maximum borrowing capacity										$ 1,000,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | April 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 300,000,000						$ 300,000,000	300,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | April 2016 Credit Facilities [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Long-term debt outstanding										$ 0
Basis spread on variable rate										2.25%
Line of credit facility, maximum borrowing capacity										$ 300,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Letter of Credit [Member] | Credit Facility 2013 [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity										150,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Letter of Credit [Member] | Credit Facility 2014 [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity										$ 300,000,000

Debt - Components of Long-Ter59

Debt - Components of Long-Term Debt - Enhanced Equipment Trust Certificates (Detail) - Enhanced Equipment Trust Certificates (EETC) [Member] $ in Millions	1 Months Ended			3 Months Ended	12 Months Ended
	Oct. 31, 2017USD ($)Debt_Instruments	Aug. 31, 2017USD ($)AircraftDebt_Instruments	Jan. 31, 2017USD ($)AircraftDebt_Instruments	Mar. 31, 2017USD ($)Aircraft	Dec. 31, 2017USD ($)	Oct. 31, 2016Aircraft
2016-3 EETC [Member]
Debt Instrument [Line Items]
Proceeds from debt issuance				$ 109
Number of aircraft financed by debt issuance | Aircraft				2		25
2016-3 EETC Series B [Member]
Debt Instrument [Line Items]
Number of pass through trusts issued | Debt_Instruments	1
Debt instrument principal amount	$ 193				$ 193
2017-1 EETC [Member]
Debt Instrument [Line Items]
Number of aircraft financed by debt issuance | Aircraft			24
Number of pass through trusts issued | Debt_Instruments			3
Debt instrument principal amount			$ 983
2017-2 EETC [Member]
Debt Instrument [Line Items]
Proceeds from debt issuance					735
Number of aircraft financed by debt issuance | Aircraft		30
Number of pass through trusts issued | Debt_Instruments		2
Debt instrument principal amount		$ 797
2017-2 EETC Series B [Member]
Debt Instrument [Line Items]
Number of pass through trusts issued | Debt_Instruments	1
Debt instrument principal amount	$ 221				221
American Airlines, Inc. [Member] | 2016-3 EETC [Member]
Debt Instrument [Line Items]
Number of aircraft financed by debt issuance | Aircraft				2		25
American Airlines, Inc. [Member] | 2016-3 EETC Series B [Member]
Debt Instrument [Line Items]
Number of pass through trusts issued | Debt_Instruments	1
Debt instrument principal amount	$ 193				193
American Airlines, Inc. [Member] | 2017-1 EETC [Member]
Debt Instrument [Line Items]
Number of aircraft financed by debt issuance | Aircraft			24
Number of pass through trusts issued | Debt_Instruments			3
Debt instrument principal amount			$ 983
American Airlines, Inc. [Member] | 2017-2 EETC [Member]
Debt Instrument [Line Items]
Proceeds from debt issuance					735
Number of aircraft financed by debt issuance | Aircraft		30
Number of pass through trusts issued | Debt_Instruments		2
Debt instrument principal amount		$ 797
American Airlines, Inc. [Member] | 2017-2 EETC Series B [Member]
Debt Instrument [Line Items]
Number of pass through trusts issued | Debt_Instruments	1
Debt instrument principal amount	$ 221				$ 221

Debt - Details of Enhanced Equi

Debt - Details of Enhanced Equipment Trust Certificates (Detail) - Enhanced Equipment Trust Certificates (EETC) [Member] - USD ($) $ in Millions	Dec. 31, 2017	Oct. 31, 2017
2016-3 Series AA Enhanced Equipment Trust Certificates [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 558
Interest rate	3.00%
2016-3 Series A Enhanced Equipment Trust Certificates [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 256
Interest rate	3.25%
2016-3 EETC Series B [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 193	$ 193
Interest rate	3.75%
2017-1 Series AA Enhanced Equipment Trust Certificates [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 537
Interest rate	3.65%
2017-1 Series A Enhanced Equipment Trust Certificates [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 248
Interest rate	4.00%
2017-1 Series B Enhanced Equipment Trust Certificates [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 198
Interest rate	4.95%
2017-2 Series AA Enhanced Equipment Trust Certificates [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 545
Debt instrument, unused borrowing capacity	$ 152
Interest rate	3.35%
2017-2 Series A Enhanced Equipment Trust Certificates [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 252
Debt instrument, unused borrowing capacity	$ 70
Interest rate	3.60%
2017-2 EETC Series B [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 221	221
Debt instrument, unused borrowing capacity	$ 61
Interest rate	3.70%
American Airlines, Inc. [Member] | 2016-3 Series AA Enhanced Equipment Trust Certificates [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 558
Interest rate	3.00%
American Airlines, Inc. [Member] | 2016-3 Series A Enhanced Equipment Trust Certificates [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 256
Interest rate	3.25%
American Airlines, Inc. [Member] | 2016-3 EETC Series B [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 193	193
Interest rate	3.75%
American Airlines, Inc. [Member] | 2017-1 Series AA Enhanced Equipment Trust Certificates [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 537
Interest rate	3.65%
American Airlines, Inc. [Member] | 2017-1 Series A Enhanced Equipment Trust Certificates [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 248
Interest rate	4.00%
American Airlines, Inc. [Member] | 2017-1 Series B Enhanced Equipment Trust Certificates [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 198
Interest rate	4.95%
American Airlines, Inc. [Member] | 2017-2 Series AA Enhanced Equipment Trust Certificates [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 545
Debt instrument, unused borrowing capacity	$ 152
Interest rate	3.35%
American Airlines, Inc. [Member] | 2017-2 Series A Enhanced Equipment Trust Certificates [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 252
Debt instrument, unused borrowing capacity	$ 70
Interest rate	3.60%
American Airlines, Inc. [Member] | 2017-2 EETC Series B [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 221	$ 221
Debt instrument, unused borrowing capacity	$ 61
Interest rate	3.70%

Debt - Components of Long-Ter61

Debt - Components of Long-Term Debt - Equipment Loans and Other Notes Payable Issued in 2016 (Detail) - Secured Debt [Member] - Equipment Loans and Other Notes Payable [Member] $ in Billions	12 Months Ended
	Dec. 31, 2017USD ($)
Debt Instrument [Line Items]
Proceeds from notes payable	$ 1
LIBOR [Member]
Debt Instrument [Line Items]
Long-term debt average interest rate	3.08%
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Proceeds from notes payable	$ 1
American Airlines, Inc. [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Long-term debt average interest rate	3.08%

Debt - Details of Senior Notes

Debt - Details of Senior Notes (Detail) - Unsecured Debt [Member]	Dec. 31, 2017USD ($)
Senior Notes 6.125% Due in 2018 [Member]
Debt Instrument [Line Items]
Principal amount	$ 500,000,000
Interest rate	6.125%
Senior Notes 5.50% Due in 2019 [Member]
Debt Instrument [Line Items]
Principal amount	$ 750,000,000
Interest rate	5.50%
Senior Notes 4.625% Due in 2020 [Member]
Debt Instrument [Line Items]
Principal amount	$ 500,000,000
Interest rate	4.625%

Debt - Components of Long-Ter63

Debt - Components of Long-Term Debt - Senior Notes (Detail)	12 Months Ended
	Dec. 31, 2017
Unsecured Debt [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Redemption price percentage	101.00%

Debt - Components of Long-Ter64

Debt - Components of Long-Term Debt - Guarantees (Detail)	Dec. 31, 2017USD ($)
Secured Debt [Member] | Special Facility Revenue Bonds [Member]
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 810,000,000
Secured Debt [Member] | Credit Facilities And Certain EETC Financings [Member]
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure, undiscounted	8,500,000,000
American Airlines, Inc. [Member] | Unsecured Debt [Member] | Senior Notes 6.125% Due in 2018 [Member]
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure, undiscounted	500,000,000
American Airlines, Inc. [Member] | Unsecured Debt [Member] | Senior Notes 5.50% Due in 2019 [Member]
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure, undiscounted	750,000,000
American Airlines, Inc. [Member] | Unsecured Debt [Member] | Senior Notes 4.625% Due in 2020 [Member]
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 500,000,000

Debt - Schedule of Collateral C

Debt - Schedule of Collateral Coverage Tests (Detail) - Secured Debt [Member]	12 Months Ended
	Dec. 31, 2017
Credit Facility 2013 [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	33.90%
Credit Facility 2014 [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	23.10%
April 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	42.70%
December 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	59.00%
American Airlines, Inc. [Member] | Credit Facility 2013 [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	33.90%
American Airlines, Inc. [Member] | Credit Facility 2014 [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	23.10%
American Airlines, Inc. [Member] | April 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	42.70%
American Airlines, Inc. [Member] | December 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	59.00%

Income Taxes - Components of In

Income Taxes - Components of Income Tax Provision (Benefit) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current income tax provision:
Federal	$ 0	$ 0	$ 0
State and Local	24	12	20
Current income tax provision (benefit)	24	12	20
Deferred income tax provision (benefit):
Federal	1,085	1,508	(2,884)
State and Local	56	103	(130)
Deferred income tax provision (benefit)	1,141	1,611	(3,014)
Income tax provision (benefit)	1,165	1,623	(2,994)
American Airlines, Inc. [Member]
Current income tax provision:
Federal	0	0	0
State and Local	24	10	15
Current income tax provision (benefit)	24	10	15
Deferred income tax provision (benefit):
Federal	1,235	1,559	(3,407)
State and Local	63	93	(60)
Deferred income tax provision (benefit)	1,298	1,652	(3,467)
Income tax provision (benefit)	$ 1,322	$ 1,662	$ (3,452)

Income Taxes - Computation of I

Income Taxes - Computation of Income Tax Provision (Benefit) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Line Items]
Statutory income tax provision	$ 1,079	$ 1,505	$ 1,616
State income tax provision, net of federal tax effect	61	63	72
Book expenses (benefits) not deductible for tax purposes	33	34	57
Bankruptcy administration expenses	1	1	3
2017 Tax Act	(7)	0	0
Change in valuation allowance	(3)	7	(4,742)
Other, net	1	13	0
Income tax provision (benefit)	1,165	1,623	(2,994)
American Airlines, Inc. [Member]
Income Tax Disclosure [Line Items]
Statutory income tax provision	1,135	1,555	1,635
State income tax provision, net of federal tax effect	54	67	71
Book expenses (benefits) not deductible for tax purposes	30	32	55
Bankruptcy administration expenses	1	1	3
2017 Tax Act	93	0	0
Change in valuation allowance	4	(1)	(5,216)
Other, net	5	8	0
Income tax provision (benefit)	$ 1,322	$ 1,662	$ (3,452)

Income Taxes - Additional Discl

Income Taxes - Additional Disclosures (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Increase (decrease) in valuation allowance		$ (7)	$ (7)	$ 4,800
Valuation allowance, Tax Cuts And Jobs Act Of 2017, deferred tax asset, increase		10
Income tax provision (benefit)		$ 1,165	1,623	(2,994)
Income tax expense, effective rate		38.00%
Impact of tax reform on deferred tax assets and liabilities	$ 7	$ 7	0	0
Effect of Tax Cuts and Jobs Act of 2017, amount		(7)	0	0
Alternative Minimum Tax Credit Carryforward [Member]
Income Taxes [Line Items]
Alternative minimum tax credit carryforwards	339	339
Federal [Member]
Income Taxes [Line Items]
Gross NOL carryforwards	10,000	10,000
Federal NOL carryforwards, maximum allowable utilization	9,000	9,000
Federal NOL carryforwards, remaining amount	8,400	8,400
State [Member]
Income Taxes [Line Items]
Gross NOL carryforwards	3,400	3,400
Substantially All Deferred Tax Assets, Including Net Operating Losses [Member]
Income Taxes [Line Items]
Increase (decrease) in valuation allowance				3,000
American Airlines, Inc. [Member]
Income Taxes [Line Items]
Increase (decrease) in valuation allowance		(12)	(1)	5,200
Valuation allowance, Tax Cuts And Jobs Act Of 2017, deferred tax asset, increase		8
Income tax provision (benefit)		$ 1,322	1,662	(3,452)
Income tax expense, effective rate		41.00%
Impact of tax reform on deferred tax assets and liabilities	(93)	$ (93)	0	0
Effect of Tax Cuts and Jobs Act of 2017, amount		93	$ 0	0
American Airlines, Inc. [Member] | Alternative Minimum Tax Credit Carryforward [Member]
Income Taxes [Line Items]
Alternative minimum tax credit carryforwards	452	452
American Airlines, Inc. [Member] | Federal [Member]
Income Taxes [Line Items]
Gross NOL carryforwards	10,600	10,600
Federal NOL carryforwards, maximum allowable utilization	9,500	9,500
Federal NOL carryforwards, remaining amount	8,600	8,600
American Airlines, Inc. [Member] | State [Member]
Income Taxes [Line Items]
Gross NOL carryforwards	$ 3,200	$ 3,200
American Airlines, Inc. [Member] | Substantially All Deferred Tax Assets, Including Net Operating Losses [Member]
Income Taxes [Line Items]
Increase (decrease) in valuation allowance				$ (3,500)

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Operating loss carryforwards	$ 2,281	$ 3,853
Pensions	1,559	2,610
Loyalty program liability	420	485
Alternative minimum tax credit carryforwards	344	344
Postretirement benefits other than pensions	170	291
Rent expense	160	256
Gains from lease transactions	107	213
Reorganization items	35	53
Other	678	972
Total deferred tax assets	5,754	9,077
Valuation allowance	(36)	(29)
Net deferred tax assets	5,718	9,048
Deferred tax liabilities:
Accelerated depreciation and amortization	(5,045)	(7,216)
Other	(279)	(345)
Total deferred tax liabilities	(5,324)	(7,561)
Net deferred tax asset	394	1,487
American Airlines, Inc. [Member]
Deferred tax assets:
Operating loss carryforwards	2,409	4,087
Pensions	1,549	2,595
Loyalty program liability	420	485
Alternative minimum tax credit carryforwards	457	456
Postretirement benefits other than pensions	170	291
Rent expense	160	256
Gains from lease transactions	107	213
Reorganization items	35	53
Other	638	911
Total deferred tax assets	5,945	9,347
Valuation allowance	(25)	(13)
Net deferred tax assets	5,920	9,334
Deferred tax liabilities:
Accelerated depreciation and amortization	(4,999)	(7,101)
Other	(274)	(335)
Total deferred tax liabilities	(5,273)	(7,436)
Net deferred tax asset	$ 647	$ 1,898

Risk Management - Additional In

Risk Management - Additional Information (Detail) $ in Billions	Dec. 31, 2017USD ($)
Debt Instrument [Line Items]
Principal amount of long-term variable rate debt	$ 9.6
Variable Rate Debt [Member]
Debt Instrument [Line Items]
Weighted average effective interest rate on variable rate debt	3.40%
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Principal amount of long-term variable rate debt	$ 9.6
American Airlines, Inc. [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Weighted average effective interest rate on variable rate debt	3.40%

Fair Value Measurements and O71

Fair Value Measurements and Other Investments - Summary of Assets Measured at Fair Value on Recurring Basis (Detail) - Recurring [Member] - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	$ 4,771	$ 6,037
Restricted cash and short-term investments	318	638
Total	5,089	6,675
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	188	589
Restricted cash and short-term investments	108	638
Total	296	1,227
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	4,583	5,448
Restricted cash and short-term investments	210
Total	4,793	5,448
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	188	589
Money Market Funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	188	589
Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	1,620	2,550
Corporate Bonds [Member] | Maturity Dates Exceeding One Year [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	341	230
Corporate Bonds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	1,620	2,550
Bank Notes / Certificates of Deposit / Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	2,663	2,898
Bank Notes / Certificates of Deposit / Time Deposits [Member] | Maturity Dates Exceeding One Year [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	700	385
Bank Notes / Certificates of Deposit / Time Deposits [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	2,663	2,898
Repurchase Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	300
American Airlines, Inc. [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	4,768	6,034
Restricted cash and short-term investments	318	638
Total	5,086	6,672
American Airlines, Inc. [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	186	587
Restricted cash and short-term investments	108	638
Total	294	1,225
American Airlines, Inc. [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	4,582	5,447
Restricted cash and short-term investments	210
Total	4,792	5,447
American Airlines, Inc. [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	186	587
American Airlines, Inc. [Member] | Money Market Funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	186	587
American Airlines, Inc. [Member] | Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	1,620	2,550
American Airlines, Inc. [Member] | Corporate Bonds [Member] | Maturity Dates Exceeding One Year [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	341	230
American Airlines, Inc. [Member] | Corporate Bonds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	1,620	2,550
American Airlines, Inc. [Member] | Bank Notes / Certificates of Deposit / Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	2,662	2,897
American Airlines, Inc. [Member] | Bank Notes / Certificates of Deposit / Time Deposits [Member] | Maturity Dates Exceeding One Year [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	700	385
American Airlines, Inc. [Member] | Bank Notes / Certificates of Deposit / Time Deposits [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	2,662	$ 2,897
American Airlines, Inc. [Member] | Repurchase Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	300
American Airlines, Inc. [Member] | Repurchase Agreements [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	$ 300

Fair Value Measurements and O72

Fair Value Measurements and Other Investments - Schedule of Carrying Value and Estimated Fair Value of Long-Term Debt, Including Current Maturities (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, including current maturities	$ 25,065	$ 24,344
Fair Value [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, including current maturities	25,848	24,983
American Airlines, Inc. [Member] | Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, including current maturities	23,294	22,577
American Airlines, Inc. [Member] | Fair Value [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, including current maturities	$ 24,029	$ 23,181

Fair Value Measurements and O73

Fair Value Measurements and Other Investments - Other Investments (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Sep. 30, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investment [Line Items]
Regional expenses			$ 6,546	$ 6,044	$ 5,983
Regional Carrier [Member]
Investment [Line Items]
Regional expenses			$ 6,546	6,044	5,983
Republic Airways Holdings, Inc. [Member]
Investment [Line Items]
Equity method investment, ownership percentage			25.00%
Republic Airways Holdings, Inc. [Member] | Regional Carrier [Member]
Investment [Line Items]
Regional expenses		$ 544
China Southern Airlines Company Limited [Member]
Investment [Line Items]
Cost method investments, ownership percentage	2.70%
Cost method investments	$ 203
Cost method investments, required holding period	3 years
American Airlines, Inc. [Member]
Investment [Line Items]
Regional expenses			$ 6,572	6,009	5,952
American Airlines, Inc. [Member] | Regional Carrier [Member]
Investment [Line Items]
Regional expenses			$ 6,572	$ 6,009	$ 5,952
American Airlines, Inc. [Member] | Republic Airways Holdings, Inc. [Member]
Investment [Line Items]
Equity method investment, ownership percentage			25.00%
American Airlines, Inc. [Member] | Republic Airways Holdings, Inc. [Member] | Regional Carrier [Member]
Investment [Line Items]
Regional expenses		$ 544
American Airlines, Inc. [Member] | China Southern Airlines Company Limited [Member]
Investment [Line Items]
Cost method investments, ownership percentage	2.70%
Cost method investments	$ 203
Cost method investments, required holding period	3 years

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Retiree medical plan, plan amendment				$ 1,900,000,000
Amortization period of gains losses related to plan amendment				8 years
Unamortized actuarial gain	$ 631,000,000
Weighted-average assumptions used to determine net periodic benefit cost, expected return on plan assets	8.00%
Estimated future employer contributions for 2018	$ 42,000,000
Defined benefit plans estimated supplemental future employer contributions in next fiscal year	425,000,000
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Retiree medical plan, plan amendment	0	$ 0
The estimated actuarial gain (loss) and prior service credit (cost) that will be amortized into net periodic benefit cost over the next fiscal year	$ (172,000,000)
Weighted-average assumptions used to determine net periodic benefit cost, expected return on plan assets	8.00%	8.00%	8.00%
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Retiree medical plan, plan amendment	$ 0	$ (7,000,000)
The estimated actuarial gain (loss) and prior service credit (cost) that will be amortized into net periodic benefit cost over the next fiscal year	$ 258,000,000
Weighted-average assumptions used to determine net periodic benefit cost, expected return on plan assets	8.00%	8.00%	8.00%
American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Retiree medical plan, plan amendment				$ 1,900,000,000
Amortization period of gains losses related to plan amendment				8 years
Unamortized actuarial gain	$ 631,000,000
Estimated future employer contributions for 2018	39,000,000
Defined benefit plans estimated supplemental future employer contributions in next fiscal year	425,000,000
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Retiree medical plan, plan amendment	0	$ 0
The estimated actuarial gain (loss) and prior service credit (cost) that will be amortized into net periodic benefit cost over the next fiscal year	$ (171,000,000)
Weighted-average assumptions used to determine net periodic benefit cost, expected return on plan assets	8.00%	8.00%	8.00%
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Retiree medical plan, plan amendment	$ 0	$ (7,000,000)
The estimated actuarial gain (loss) and prior service credit (cost) that will be amortized into net periodic benefit cost over the next fiscal year	$ 258,000,000
Weighted-average assumptions used to determine net periodic benefit cost, expected return on plan assets	8.00%	8.00%	8.00%

Employee Benefit Plans - Schedu

Employee Benefit Plans - Schedule of Changes in Projected Benefit Obligations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2012
Reconciliation of benefit obligation:
Plan amendments				$ (1,900)
Pension Benefits [Member]
Reconciliation of benefit obligation:
Obligation beginning balance	$ 17,238	$ 16,395
Service cost	2	2	$ 2
Interest cost	721	749	737
Actuarial (gain) loss	1,016	729
Plan amendments	0	0
Settlements	(4)	(2)
Benefit payments	(726)	(635)
Other	28	0
Obligation end of period	18,275	17,238	16,395
Retiree Medical And Other Postretirement Benefits [Member]
Reconciliation of benefit obligation:
Obligation beginning balance	991	1,131
Service cost	4	3	3
Interest cost	39	47	50
Actuarial (gain) loss	49	(105)
Plan amendments	0	7
Settlements	0	0
Benefit payments	(80)	(92)
Other	8	0
Obligation end of period	1,011	991	1,131
American Airlines, Inc. [Member]
Reconciliation of benefit obligation:
Plan amendments				$ (1,900)
American Airlines, Inc. [Member] | Pension Benefits [Member]
Reconciliation of benefit obligation:
Obligation beginning balance	17,148	16,310
Service cost	2	2	1
Interest cost	717	746	733
Actuarial (gain) loss	1,007	725
Plan amendments	0	0
Settlements	(4)	(2)
Benefit payments	(723)	(633)
Other	28	0
Obligation end of period	18,175	17,148	16,310
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Reconciliation of benefit obligation:
Obligation beginning balance	990	1,129
Service cost	4	3	3
Interest cost	39	47	50
Actuarial (gain) loss	49	(104)
Plan amendments	0	7
Settlements	0	0
Benefit payments	(80)	(92)
Other	8	0
Obligation end of period	$ 1,010	$ 990	$ 1,129

Employee Benefit Plans - Sche76

Employee Benefit Plans - Schedule of Changes in Fair Value of Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	$ 10,017	$ 9,707
Actual return on plan assets	1,797	915
Employer contributions	286	32
Settlements	(4)	(2)
Benefit payments	(726)	(635)
Other	25	0
Fair value of plan assets at end of period	11,395	10,017
Funded status at end of period	(6,880)	(7,221)
Supplemental contributions by employer	261
Minimum required cash contribution	25
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	266	253
Actual return on plan assets	37	22
Employer contributions	72	83
Settlements	0	0
Benefit payments	(80)	(92)
Other	0	0
Fair value of plan assets at end of period	295	266
Funded status at end of period	(716)	(725)
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	9,968	9,660
Actual return on plan assets	1,788	911
Employer contributions	286	32
Settlements	(4)	(2)
Benefit payments	(723)	(633)
Other	25	0
Fair value of plan assets at end of period	11,340	9,968
Funded status at end of period	6,835	7,180
Supplemental contributions by employer	261
Minimum required cash contribution	25
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	266	253
Actual return on plan assets	37	22
Employer contributions	72	83
Settlements	0	0
Benefit payments	(80)	(92)
Other	0	0
Fair value of plan assets at end of period	295	266
Funded status at end of period	$ 715	$ 724

Employee Benefit Plans - Sche77

Employee Benefit Plans - Schedule of Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liability	$ 7,497	$ 7,842
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liability	10	7
Noncurrent liability	6,870	7,214
Amounts recognized in the consolidated balance sheets	6,880	7,221
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liability	89	97
Noncurrent liability	627	628
Amounts recognized in the consolidated balance sheets	716	725
American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liability	7,452	7,800
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liability	10	7
Noncurrent liability	6,825	7,173
Amounts recognized in the consolidated balance sheets	6,835	7,180
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liability	88	97
Noncurrent liability	627	627
Amounts recognized in the consolidated balance sheets	$ 715	$ 724

Employee Benefit Plans - Sche78

Employee Benefit Plans - Schedule of Amounts Recognized in Other Comprehensive Income (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ 5,351	$ 5,484
Prior service cost (benefit)	160	188
Total accumulated other comprehensive loss (income), pre-tax	5,511	5,672
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(388)	(430)
Prior service cost (benefit)	(600)	(837)
Total accumulated other comprehensive loss (income), pre-tax	(988)	(1,267)
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	5,337	5,472
Prior service cost (benefit)	159	188
Total accumulated other comprehensive loss (income), pre-tax	5,496	5,660
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(388)	(429)
Prior service cost (benefit)	(600)	(837)
Total accumulated other comprehensive loss (income), pre-tax	$ (988)	$ (1,266)

Employee Benefit Plans - Sche79

Employee Benefit Plans - Schedule of Accumulated Benefit Obligations Exceeding Fair Value of Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation (PBO)	$ 18,245	$ 17,209
Accumulated benefit obligation (ABO)	18,235	17,197
Fair value of plan assets	11,364	9,986
ABO less fair value of plan assets	6,871	7,211
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated postretirement benefit obligation (APBO)	1,011	990
Fair value of plan assets	295	266
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation (PBO)	18,144	17,119
Accumulated benefit obligation (ABO)	18,135	17,108
Fair value of plan assets	11,307	9,936
ABO less fair value of plan assets	6,828	7,172
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated postretirement benefit obligation (APBO)	1,010	990
Fair value of plan assets	$ 295	$ 266

Employee Benefit Plans - Compon

Employee Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits [Member]
Defined benefit plans:
Service cost	$ 2	$ 2	$ 2
Interest cost	721	749	737
Expected return on assets	(790)	(750)	(851)
Settlements	1	0	1
Prior service cost (benefit)	28	28	28
Unrecognized net loss (gain)	144	126	112
Net periodic benefit cost (income)	106	155	29
Defined contribution plan cost	851	766	662
Total cost (income)	957	921	691
Retiree Medical And Other Postretirement Benefits [Member]
Defined benefit plans:
Service cost	4	3	3
Interest cost	39	47	50
Expected return on assets	(21)	(20)	(19)
Settlements	0	0	0
Prior service cost (benefit)	(237)	(240)	(243)
Unrecognized net loss (gain)	(23)	(17)	(9)
Net periodic benefit cost (income)	(238)	(227)	(218)
Total cost (income)	(238)	(227)	(218)
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined benefit plans:
Service cost	2	2	1
Interest cost	717	746	733
Expected return on assets	(786)	(747)	(848)
Settlements	1	0	1
Prior service cost (benefit)	28	28	28
Unrecognized net loss (gain)	144	125	111
Net periodic benefit cost (income)	106	154	26
Defined contribution plan cost	844	761	657
Total cost (income)	950	915	683
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined benefit plans:
Service cost	4	3	3
Interest cost	39	47	50
Expected return on assets	(21)	(20)	(19)
Settlements			0
Prior service cost (benefit)	(237)	(240)	(243)
Unrecognized net loss (gain)	(23)	(16)	(9)
Net periodic benefit cost (income)	(238)	(226)	(218)
Total cost (income)	$ (238)	$ (226)	$ (218)

Employee Benefit Plans - Sche81

Employee Benefit Plans - Schedule of Assumption Used to Determine Benefit Obligations (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Weighted-average assumptions used to determine net periodic benefit cost, expected return on plan assets	8.00%
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average assumptions used to determine benefit obligations, discount rate	3.80%	4.30%
Weighted-average assumptions used to determine net periodic benefit cost, discount rate	4.30%	4.70%	4.30%
Weighted-average assumptions used to determine net periodic benefit cost, expected return on plan assets	8.00%	8.00%	8.00%
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average assumptions used to determine benefit obligations, discount rate	3.60%	4.10%
Weighted-average assumptions used to determine net periodic benefit cost, discount rate	4.10%	4.42%	4.00%
Weighted-average assumptions used to determine net periodic benefit cost, expected return on plan assets	8.00%	8.00%	8.00%
Weighted-average assumptions used to determine net periodic benefit cost, health care cost trend rate assumed for next year	4.19%	4.25%	5.21%
Weighted average health care cost trend rate assumed for 2024 and thereafter	3.76%
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average assumptions used to determine benefit obligations, discount rate	3.80%	4.30%
Weighted-average assumptions used to determine net periodic benefit cost, discount rate	4.30%	4.70%	4.30%
Weighted-average assumptions used to determine net periodic benefit cost, expected return on plan assets	8.00%	8.00%	8.00%
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Weighted-average assumptions used to determine benefit obligations, discount rate	3.60%	4.10%
Weighted-average assumptions used to determine net periodic benefit cost, discount rate	4.10%	4.42%	4.00%
Weighted-average assumptions used to determine net periodic benefit cost, expected return on plan assets	8.00%	8.00%	8.00%
Weighted-average assumptions used to determine net periodic benefit cost, health care cost trend rate assumed for next year	4.19%	4.25%	5.21%
Weighted average health care cost trend rate assumed for 2024 and thereafter	3.76%

Employee Benefit Plans - Sche82

Employee Benefit Plans - Schedule of One Percentage Point Change in Assumed Health Care Cost Trend Rates (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) on 2017 service and interest cost, 1% Increase	$ 2
Increase (decrease) on benefit obligation as of December 31, 2017, 1% Increase	54
Increase (decrease) on 2017 service and interest cost, 1% Decrease	(2)
Increase(decrease) on benefits obligation as of December 31, 2017, 1% Decrease	(51)
American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) on 2017 service and interest cost, 1% Increase	2
Increase (decrease) on benefit obligation as of December 31, 2017, 1% Increase	54
Increase (decrease) on 2017 service and interest cost, 1% Decrease	(2)
Increase(decrease) on benefits obligation as of December 31, 2017, 1% Decrease	$ (51)

Employee Benefit Plans - Sche83

Employee Benefit Plans - Schedule of Expected Future Service Benefit Payments (Detail) $ in Millions	Dec. 31, 2017USD ($)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2,018	$ 715
2,019	754
2,020	799
2,021	843
2,022	884
2023-2027	4,976
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2,018	96
2,019	92
2,020	80
2,021	75
2,022	70
2023-2027	315
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2,018	712
2,019	750
2,020	795
2,021	839
2,022	879
2023-2027	4,951
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2,018	96
2,019	92
2,020	80
2,021	75
2,022	70
2023-2027	$ 314

Employee Benefit Plans - Sche84

Employee Benefit Plans - Schedule of Allocation of Plan Assets (Detail)	Dec. 31, 2017
Equity [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	65.00%
Equity [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	90.00%
U.S. Large [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	20.00%
U.S. Large [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	50.00%
U.S. Small/Mid [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
U.S. Small/Mid [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	10.00%
International [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	17.00%
International [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	27.00%
Emerging Markets [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	5.00%
Emerging Markets [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	11.00%
Alternative Investments [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	5.00%
Alternative Investments [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	20.00%
Fixed Income [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	15.00%
Fixed Income [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	40.00%
U.S. Long Duration [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	15.00%
U.S. Long Duration [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	30.00%
High Yield and Emerging Markets [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
High Yield and Emerging Markets [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	10.00%
Private Fixed Income [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
Private Fixed Income [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	10.00%
Other [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
Other [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	5.00%
Cash Equivalents [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
Cash Equivalents [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	5.00%
American Airlines, Inc. [Member] | Equity [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	65.00%
American Airlines, Inc. [Member] | Equity [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	90.00%
American Airlines, Inc. [Member] | U.S. Large [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	20.00%
American Airlines, Inc. [Member] | U.S. Large [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	50.00%
American Airlines, Inc. [Member] | U.S. Small/Mid [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
American Airlines, Inc. [Member] | U.S. Small/Mid [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	10.00%
American Airlines, Inc. [Member] | International [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	17.00%
American Airlines, Inc. [Member] | International [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	27.00%
American Airlines, Inc. [Member] | Emerging Markets [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	5.00%
American Airlines, Inc. [Member] | Emerging Markets [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	11.00%
American Airlines, Inc. [Member] | Alternative Investments [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	5.00%
American Airlines, Inc. [Member] | Alternative Investments [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	20.00%
American Airlines, Inc. [Member] | Fixed Income [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	15.00%
American Airlines, Inc. [Member] | Fixed Income [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	40.00%
American Airlines, Inc. [Member] | U.S. Long Duration [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	15.00%
American Airlines, Inc. [Member] | U.S. Long Duration [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	30.00%
American Airlines, Inc. [Member] | High Yield and Emerging Markets [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
American Airlines, Inc. [Member] | High Yield and Emerging Markets [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	10.00%
American Airlines, Inc. [Member] | Private Fixed Income [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
American Airlines, Inc. [Member] | Private Fixed Income [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	10.00%
American Airlines, Inc. [Member] | Other [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
American Airlines, Inc. [Member] | Other [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	5.00%
American Airlines, Inc. [Member] | Cash Equivalents [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
American Airlines, Inc. [Member] | Cash Equivalents [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	5.00%

Employee Benefit Plans - Sche85

Employee Benefit Plans - Schedule of Fair Value of Pension Plan Assets by Asset Category (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 11,395	$ 10,017	$ 9,707
Pension Benefits [Member] | Private Equity Partnerships [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14	21	16
Pension Benefits [Member] | Insurance Group Annuity Contracts [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	2	2
Pension Benefits [Member] | Recurring [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,395	10,017
Pension Benefits [Member] | Recurring [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,281	6,508
Pension Benefits [Member] | Recurring [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,936	2,556
Pension Benefits [Member] | Recurring [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16	23
Pension Benefits [Member] | Recurring [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28	573
Pension Benefits [Member] | Recurring [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28	573
Pension Benefits [Member] | Recurring [Member] | International Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,837	3,232
Pension Benefits [Member] | Recurring [Member] | International Markets [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,837	3,232
Pension Benefits [Member] | Recurring [Member] | Large-Cap Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,451	2,253
Pension Benefits [Member] | Recurring [Member] | Large-Cap Companies [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,451	2,253
Pension Benefits [Member] | Recurring [Member] | Mid-Cap Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	744	371
Pension Benefits [Member] | Recurring [Member] | Mid-Cap Companies [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	744	371
Pension Benefits [Member] | Recurring [Member] | Small-Cap Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	125	6
Pension Benefits [Member] | Recurring [Member] | Small-Cap Companies [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	125	6
Pension Benefits [Member] | Recurring [Member] | Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	55	49
Pension Benefits [Member] | Recurring [Member] | Mutual Funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	55	49
Pension Benefits [Member] | Recurring [Member] | Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,344	2,337
Pension Benefits [Member] | Recurring [Member] | Corporate Bonds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,344	2,337
Pension Benefits [Member] | Recurring [Member] | Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	238	150
Pension Benefits [Member] | Recurring [Member] | Government Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	238	150
Pension Benefits [Member] | Recurring [Member] | U.S. Municipal Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	39	37
Pension Benefits [Member] | Recurring [Member] | U.S. Municipal Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	39	37
Pension Benefits [Member] | Recurring [Member] | Private Equity Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14	21
Pension Benefits [Member] | Recurring [Member] | Private Equity Partnerships [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14	21
Pension Benefits [Member] | Recurring [Member] | Private Equity Partnerships Measured At Net Asset Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	879	703
Pension Benefits [Member] | Recurring [Member] | Common Collective Trusts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	315	32
Pension Benefits [Member] | Recurring [Member] | Common Collective Trusts [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	315	32
Pension Benefits [Member] | Recurring [Member] | Common Collective Trusts and 103-12 Investment Trust Measured at Net Asset Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	283	227
Pension Benefits [Member] | Recurring [Member] | Insurance Group Annuity Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	2
Pension Benefits [Member] | Recurring [Member] | Insurance Group Annuity Contracts [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	2
Pension Benefits [Member] | Recurring [Member] | Dividend and Interest Receivable [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	44	40
Pension Benefits [Member] | Recurring [Member] | Dividend and Interest Receivable [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	44	40
Pension Benefits [Member] | Recurring [Member] | Due to/from Brokers for Sale of Securities - Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	(9)
Pension Benefits [Member] | Recurring [Member] | Due to/from Brokers for Sale of Securities - Net [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	(9)
Pension Benefits [Member] | Recurring [Member] | Other Liabilities - Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(6)	(7)
Pension Benefits [Member] | Recurring [Member] | Other Liabilities - Net [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(6)	(7)
American Airlines, Inc. [Member] | Private Equity Partnerships [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14	21	16
American Airlines, Inc. [Member] | Insurance Group Annuity Contracts [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	2	2
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,340	9,968	$ 9,660
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11,340	9,968
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,226	6,459
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,936	2,556
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16	23
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28	573
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	28	573
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | International Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,837	3,232
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | International Markets [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,837	3,232
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Large-Cap Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,451	2,253
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Large-Cap Companies [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,451	2,253
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Mid-Cap Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	744	371
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Mid-Cap Companies [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	744	371
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Small-Cap Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	125	6
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Small-Cap Companies [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	125	6
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,344	2,337
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Corporate Bonds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,344	2,337
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	238	150
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Government Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	238	150
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | U.S. Municipal Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	39	37
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | U.S. Municipal Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	39	37
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Private Equity Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14	21
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Private Equity Partnerships [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	14	21
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Private Equity Partnerships Measured At Net Asset Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	879	703
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Common Collective Trusts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	315	32
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Common Collective Trusts [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	315	32
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Common Collective Trusts and 103-12 Investment Trust Measured at Net Asset Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	283	227
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Insurance Group Annuity Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	2
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Insurance Group Annuity Contracts [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2	2
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Dividend and Interest Receivable [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	44	40
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Dividend and Interest Receivable [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	44	40
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Due to/from Brokers for Sale of Securities - Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	(9)
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Due to/from Brokers for Sale of Securities - Net [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	(9)
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Other Liabilities - Net [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(6)	(7)
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Other Liabilities - Net [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ (6)	$ (7)

Employee Benefit Plans - Sche86

Employee Benefit Plans - Schedule of Fair Value of Pension Plan Assets by Asset Category (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
International Markets [Member] | United Kingdom [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	17.00%	15.00%
International Markets [Member] | Japan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	11.00%	12.00%
International Markets [Member] | France [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	9.00%	10.00%
International Markets [Member] | Switzerland [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	6.00%	7.00%
International Markets [Member] | Netherlands [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations		6.00%
International Markets [Member] | Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	16.00%	17.00%
International Markets [Member] | No Concentration Greater than 5% In Any One Country [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	41.00%	33.00%
International Markets [Member] | American Airlines, Inc. [Member] | United Kingdom [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	17.00%	15.00%
International Markets [Member] | American Airlines, Inc. [Member] | Japan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	11.00%	12.00%
International Markets [Member] | American Airlines, Inc. [Member] | France [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	9.00%	10.00%
International Markets [Member] | American Airlines, Inc. [Member] | Switzerland [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	6.00%	7.00%
International Markets [Member] | American Airlines, Inc. [Member] | Netherlands [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations		6.00%
International Markets [Member] | American Airlines, Inc. [Member] | Emerging Markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	16.00%	17.00%
International Markets [Member] | American Airlines, Inc. [Member] | No Concentration Greater than 5% In Any One Country [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	41.00%	33.00%
Mutual Funds [Member] | U.S. Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	39.00%	42.00%
Mutual Funds [Member] | US Treasuries and Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	34.00%	33.00%
Mutual Funds [Member] | International Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	27.00%	25.00%
Mutual Funds [Member] | International Companies [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	30.00%	27.00%
Corporate Bonds [Member] | U.S. Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	85.00%	86.00%
Corporate Bonds [Member] | U.S. Companies [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	85.00%	86.00%
Corporate Bonds [Member] | International Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	12.00%	12.00%
Corporate Bonds [Member] | International Companies [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	12.00%	12.00%
Corporate Bonds [Member] | Corporate Debt with A Standard and Poor's (S&P) Rating Lower than A [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	76.00%	74.00%
Corporate Bonds [Member] | Corporate Debt with A Standard and Poor's (S&P) Rating Lower than A [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	76.00%	74.00%
Corporate Bonds [Member] | Corporate Debt with Standard and Poor's (S&P) Rating A or Higher [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	24.00%	26.00%
Corporate Bonds [Member] | Corporate Debt with Standard and Poor's (S&P) Rating A or Higher [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	24.00%	26.00%
Corporate Bonds [Member] | Emerging Market Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	3.00%	2.00%
Corporate Bonds [Member] | Emerging Market Companies [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	3.00%	2.00%
Government Securities [Member] | Domestic Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	27.00%	61.00%
Government Securities [Member] | Domestic Government Securities [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	27.00%	61.00%
Government Securities [Member] | Emerging Market Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	43.00%	39.00%
Government Securities [Member] | Emerging Market Government Securities [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	43.00%	39.00%
Government Securities [Member] | Other International Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	30.00%
Government Securities [Member] | Other International Government Securities [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	30.00%
Government Securities [Member] | U.S. Buyout Opportunities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations		95.00%
Government Securities [Member] | European Buyout Opportunities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations		5.00%
Private Equity Partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan master trust future funding commitments	$ 903	$ 456
Private Equity Partnerships [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan master trust future funding commitments	$ 903	$ 456
Private Equity Partnerships [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated year of liquidation of underlying assets	1 year	1 year
Private Equity Partnerships [Member] | Minimum [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated year of liquidation of underlying assets	1 year	1 year
Private Equity Partnerships [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated year of liquidation of underlying assets	10 years	10 years
Private Equity Partnerships [Member] | Maximum [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated year of liquidation of underlying assets	10 years	10 years
Private Equity Partnerships [Member] | U.S. Buyout Opportunities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	94.00%
Private Equity Partnerships [Member] | U.S. Buyout Opportunities [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	94.00%	95.00%
Private Equity Partnerships [Member] | European Buyout Opportunities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	6.00%
Private Equity Partnerships [Member] | European Buyout Opportunities [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	6.00%	5.00%
Common/Collective Trust and 103-2 Investment Trusts [Member] | Collective Interest Trust [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	42.00%
Common/Collective Trust and 103-2 Investment Trusts [Member] | Collective Interest Trust [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	42.00%
Common/Collective Trust and 103-2 Investment Trusts [Member] | Emerging Market 103-12 Investment Trust [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	40.00%	73.00%
Common/Collective Trust and 103-2 Investment Trusts [Member] | Emerging Market 103-12 Investment Trust [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	40.00%	73.00%
Common/Collective Trust and 103-2 Investment Trusts [Member] | Canadian Segregated Balanced Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	10.00%	12.00%
Common/Collective Trust and 103-2 Investment Trusts [Member] | Canadian Segregated Balanced Value [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	10.00%	12.00%
Common/Collective Trust and 103-2 Investment Trusts [Member] | Common/Collective Trust [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	8.00%	15.00%
Common/Collective Trust and 103-2 Investment Trusts [Member] | Common/Collective Trust [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	8.00%	15.00%

Employee Benefit Plans - Change

Employee Benefit Plans - Changes in Fair Value Measurements of Level 3 Investments (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits [Member]
Change in fair value measurements of level 3 investments
Fair value of plan assets at beginning of period	$ 10,017	$ 9,707
Fair value of plan assets at end of period	11,395	10,017
Pension Benefits [Member] | Level 3 [Member] | Private Equity Partnerships [Member]
Change in fair value measurements of level 3 investments
Fair value of plan assets at beginning of period	21	16
Actual loss on plan assets relating to assets still held at the reporting date	(4)
Actual return on plan assets relating to assets sold during the period		7
Purchases	1	7
Sales	(1)	(9)
Transfers out	(3)
Fair value of plan assets at end of period	14	21
Pension Benefits [Member] | Level 3 [Member] | Insurance Group Annuity Contracts [Member]
Change in fair value measurements of level 3 investments
Fair value of plan assets at beginning of period	2	2
Fair value of plan assets at end of period	2	2
American Airlines, Inc. [Member] | Level 3 [Member] | Private Equity Partnerships [Member]
Change in fair value measurements of level 3 investments
Fair value of plan assets at beginning of period	21	16
Actual loss on plan assets relating to assets still held at the reporting date	(4)
Actual return on plan assets relating to assets sold during the period		7
Purchases	1	7
Sales	(1)	(9)
Transfers out	(3)
Fair value of plan assets at end of period	14	21
American Airlines, Inc. [Member] | Level 3 [Member] | Insurance Group Annuity Contracts [Member]
Change in fair value measurements of level 3 investments
Fair value of plan assets at beginning of period	2	2
Fair value of plan assets at end of period	2	2
American Airlines, Inc. [Member] | Pension Benefits [Member]
Change in fair value measurements of level 3 investments
Fair value of plan assets at beginning of period	9,968	9,660
Fair value of plan assets at end of period	$ 11,340	$ 9,968

Employee Benefit Plans - Fair V

Employee Benefit Plans - Fair Values of Retiree Medical and Other Postretirement Benefit Plans Assets by Asset Category (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Mutual Funds [Member] | International Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	27.00%	25.00%
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 295	$ 266	$ 253
Retiree Medical And Other Postretirement Benefits [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5	266
Retiree Medical And Other Postretirement Benefits [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	290
Retiree Medical And Other Postretirement Benefits [Member] | Money Market Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5	5
Retiree Medical And Other Postretirement Benefits [Member] | Money Market Funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5	$ 5
Retiree Medical And Other Postretirement Benefits [Member] | Money Market Funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0
Retiree Medical And Other Postretirement Benefits [Member] | Mutual Funds [Member] | International Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	30.00%	27.00%
Retiree Medical And Other Postretirement Benefits [Member] | Mutual Funds AAL Class [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 290
Retiree Medical And Other Postretirement Benefits [Member] | Mutual Funds AAL Class [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Retiree Medical And Other Postretirement Benefits [Member] | Mutual Funds AAL Class [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 290
Retiree Medical And Other Postretirement Benefits [Member] | Mutual Funds Institutional Class [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 261
Retiree Medical And Other Postretirement Benefits [Member] | Mutual Funds Institutional Class [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 261
American Airlines, Inc. [Member] | Mutual Funds [Member] | International Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	30.00%	27.00%
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 295	$ 266	$ 253
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5	266
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	290	0
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member] | Money Market Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5	5
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member] | Money Market Funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5	5
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member] | Money Market Funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member] | Mutual Funds AAL Class [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	290
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member] | Mutual Funds AAL Class [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member] | Mutual Funds AAL Class [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 290	0
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member] | Mutual Funds Institutional Class [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		261
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member] | Mutual Funds Institutional Class [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 261

Employee Benefit Plans Employee

Employee Benefit Plans Employee Benefit Plans - Profit Sharing Program (Details) - Deferred Profit Sharing [Member] $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Pre-tax income excluding special items for employee profit sharing, percentage	5.00%
Employee profit sharing program, amount	$ 241
American Airlines, Inc. [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Pre-tax income excluding special items for employee profit sharing, percentage	5.00%
Employee profit sharing program, amount	$ 241

Accumulated Other Comprehensi90

Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
AOCI tax, attributable to parent [Roll Forward]
Beginning Balance, tax	$ (677)	$ (880)
Other comprehensive income (loss) before reclassifications, tax	15	166
Amounts reclassified from accumulated other comprehensive income (loss), tax	32	37
Net current-period other comprehensive income (loss), tax	47	203
Ending Balance, tax	(630)	(677)	$ (880)
AOCI attributable to parent, net of tax [Roll Forward]
Beginning Balance, net of tax	(5,083)	(4,732)
Other comprehensive income (loss) before reclassifications, net of tax	(16)	(286)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(55)	(65)
Total other comprehensive loss, net of tax	(71)	(351)	(173)
Ending Balance, net of tax	(5,154)	(5,083)	(4,732)
Pension, Retiree Medical and Other Postretirement Benefits [Member]
AOCI attributable to parent, before tax [Roll Forward]
Beginning Balance, before tax	(4,406)	(3,842)
Other comprehensive income (loss) before reclassifications, before tax	(30)	(462)
Amounts reclassified from accumulated other comprehensive income (loss), before tax	(87)	(102)
Total other comprehensive income (loss), before tax	(117)	(564)
Ending Balance, before tax	(4,523)	(4,406)	(3,842)
Unrealized Gain/(Loss) on Investments [Member]
AOCI attributable to parent, before tax [Roll Forward]
Beginning Balance, before tax	0	(10)
Other comprehensive income (loss) before reclassifications, before tax	(1)	10
Amounts reclassified from accumulated other comprehensive income (loss), before tax		0
Total other comprehensive income (loss), before tax	(1)	10
Ending Balance, before tax	(1)	0	(10)
American Airlines, Inc. [Member]
AOCI tax, attributable to parent [Roll Forward]
Beginning Balance, tax	(788)	(991)
Other comprehensive income (loss) before reclassifications, tax	14	166
Amounts reclassified from accumulated other comprehensive income (loss), tax	32	37
Net current-period other comprehensive income (loss), tax	46	203
Ending Balance, tax	(742)	(788)	(991)
AOCI attributable to parent, net of tax [Roll Forward]
Beginning Balance, net of tax	(5,182)	(4,831)
Other comprehensive income (loss) before reclassifications, net of tax	(14)	(286)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax	(55)	(65)
Total other comprehensive loss, net of tax	(69)	(351)	(175)
Ending Balance, net of tax	(5,251)	(5,182)	(4,831)
American Airlines, Inc. [Member] | Pension, Retiree Medical and Other Postretirement Benefits [Member]
AOCI attributable to parent, before tax [Roll Forward]
Beginning Balance, before tax	(4,394)	(3,831)
Other comprehensive income (loss) before reclassifications, before tax	(27)	(461)
Amounts reclassified from accumulated other comprehensive income (loss), before tax	(87)	(102)
Total other comprehensive income (loss), before tax	(114)	(563)
Ending Balance, before tax	(4,508)	(4,394)	(3,831)
American Airlines, Inc. [Member] | Unrealized Gain/(Loss) on Investments [Member]
AOCI attributable to parent, before tax [Roll Forward]
Beginning Balance, before tax	0	(9)
Other comprehensive income (loss) before reclassifications, before tax	(1)	9
Amounts reclassified from accumulated other comprehensive income (loss), before tax		0
Total other comprehensive income (loss), before tax	(1)	9
Ending Balance, before tax	$ (1)	$ 0	$ (9)

Accumulated Other Comprehensi91

Accumulated Other Comprehensive Income (Loss) - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified from accumulated other comprehensive income (loss), net of tax	$ (55)	$ (65)
Prior Service Benefit [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified from accumulated other comprehensive income (loss), net of tax	(132)	(134)
Actuarial Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified from accumulated other comprehensive income (loss), net of tax	77	69
American Airlines, Inc. [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified from accumulated other comprehensive income (loss), net of tax	(55)	(65)
American Airlines, Inc. [Member] | Prior Service Benefit [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified from accumulated other comprehensive income (loss), net of tax	(132)	(134)
American Airlines, Inc. [Member] | Actuarial Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amount reclassified from accumulated other comprehensive income (loss), net of tax	$ 77	$ 69

Commitments, Contingencies an92

Commitments, Contingencies and Guarantees - Long-term Purchase Commitments (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Long-term Purchase Commitment [Line Items]
Equipment purchase deposits	$ 1,217	$ 1,209
Aircraft and Engine Purchase Commitments [Member]
Long-term Purchase Commitment [Line Items]
2,018	1,826
2,019	2,730
2,020	2,730
2,021	2,858
2,022	2,138
2023 and Thereafter	1,482
Total	13,764
American Airlines, Inc. [Member]
Long-term Purchase Commitment [Line Items]
Equipment purchase deposits	1,217	$ 1,209
American Airlines, Inc. [Member] | Aircraft and Engine Purchase Commitments [Member]
Long-term Purchase Commitment [Line Items]
2,018	1,826
2,019	2,730
2,020	2,730
2,021	2,858
2,022	2,138
2023 and Thereafter	1,482
Total	$ 13,764

Commitments, Contingencies an93

Commitments, Contingencies and Guarantees - Operating Leases (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)Aircraft	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Operating Leased Assets [Line Items]
Number of aircraft operating under operating leases | Aircraft	421
Future minimum lease payments, 2018	$ 2,195
Future minimum lease payments, 2019	1,974
Future minimum lease payments, 2020	1,784
Future minimum lease payments, 2021	1,339
Future minimum lease payments, 2022	1,159
Future minimum lease payments, 2023 and Thereafter	3,266
Future minimum lease payments, Total	11,717
Operating leases, rent expense	$ 2,800	$ 2,800	$ 2,800
Air Transportation Equipment [Member] | Minimum [Member]
Operating Leased Assets [Line Items]
Lessee leasing arrangements, operating leases, remaining term of contract	3 months
Air Transportation Equipment [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Lessee leasing arrangements, operating leases, remaining term of contract	12 years
American Airlines, Inc. [Member]
Operating Leased Assets [Line Items]
Number of aircraft operating under operating leases | Aircraft	410
Future minimum lease payments, 2018	$ 2,178
Future minimum lease payments, 2019	1,966
Future minimum lease payments, 2020	1,776
Future minimum lease payments, 2021	1,331
Future minimum lease payments, 2022	1,155
Future minimum lease payments, 2023 and Thereafter	3,253
Future minimum lease payments, Total	11,659
Operating leases, rent expense	$ 2,800	$ 2,700	$ 2,700
American Airlines, Inc. [Member] | Air Transportation Equipment [Member] | Minimum [Member]
Operating Leased Assets [Line Items]
Lessee leasing arrangements, operating leases, remaining term of contract	3 months
American Airlines, Inc. [Member] | Air Transportation Equipment [Member] | Maximum [Member]
Operating Leased Assets [Line Items]
Lessee leasing arrangements, operating leases, remaining term of contract	12 years

Commitments, Contingencies an94

Commitments, Contingencies and Guarantees - Other Purchase Commitments (Details) - Jet Fuel, Facility Construction Projects and Information Technology Support [Member] $ in Millions	Dec. 31, 2017USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
Purchase commitments, 2018	$ 2,000
Purchase commitments, 2019	1,400
Purchase commitments, 2020	890
Purchase commitments, 2021	950
American Airlines, Inc. [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Purchase commitments, 2018	2,000
Purchase commitments, 2019	1,400
Purchase commitments, 2020	890
Purchase commitments, 2021	$ 950

Commitments, Contingencies an95

Commitments, Contingencies and Guarantees - Capacity Purchase Agreements (Detail) $ in Millions	Dec. 31, 2017USD ($)
Airline Capacity Purchase Arrangements [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Capacity purchase agreement, percentage of reimbursement for certain variable costs	100.00%
2,018	$ 1,457
2,019	1,311
2,020	1,063
2,021	866
2,022	699
2023 and Thereafter	2,073
Total	7,469
Obligations Related To Aircraft To Be Leased [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
2,018	377
2,019	355
2,020	320
2,021	282
2,022	239
2023 and Thereafter	$ 699
American Airlines, Inc. [Member] | Airline Capacity Purchase Arrangements [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Capacity purchase agreement, percentage of reimbursement for certain variable costs	100.00%
2,018	$ 1,457
2,019	1,311
2,020	1,063
2,021	866
2,022	699
2023 and Thereafter	2,073
Total	7,469
American Airlines, Inc. [Member] | Obligations Related To Aircraft To Be Leased [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
2,018	377
2,019	355
2,020	320
2,021	282
2,022	239
2023 and Thereafter	$ 699

Commitments, Contingencies an96

Commitments, Contingencies and Guarantees - Additional Information (Detail) shares in Millions	1 Months Ended
	Jun. 30, 2015Lawsuits	Dec. 31, 2017USD ($)EmployeesAircraftshares
Long-term Purchase Commitment [Line Items]
Number of aircraft owned through financing under EETC | Aircraft		387
Number of aircraft operating leased under trusts | Aircraft		113
Operating leases future minimum payments		$ 11,717,000,000
Letters of credit outstanding and surety bonds, amount		$ 448,000,000
Shares reserved for future issuance | shares		24.5
Number of putative class action lawsuits | Lawsuits	100
Number of full-time equivalent employees | Employees		126,600
Percentage of employees covered by collective bargaining agreements with various labor unions		85.00%
Regional Carrier [Member]
Long-term Purchase Commitment [Line Items]
Number of full-time equivalent employees | Employees		23,500
EETC Leveraged Lease Financings [Member]
Long-term Purchase Commitment [Line Items]
Operating leases future minimum payments		$ 572,000,000
Special Facility Revenue Bonds [Member]
Long-term Purchase Commitment [Line Items]
Operating leases future minimum payments		589,000,000
Enhanced Equipment Trust Certificates (EETC) [Member]
Long-term Purchase Commitment [Line Items]
EETC Carrying Value		11,900,000,000
Restricted Cash [Member]
Long-term Purchase Commitment [Line Items]
Letters of credit outstanding and surety bonds, amount		$ 88,000,000
American Airlines, Inc. [Member]
Long-term Purchase Commitment [Line Items]
Number of aircraft owned through financing under EETC | Aircraft		387
Number of aircraft operating leased under trusts | Aircraft		113
Operating leases future minimum payments		$ 11,659,000,000
Letters of credit outstanding and surety bonds, amount		$ 448,000,000
Number of putative class action lawsuits | Lawsuits	100
Number of full-time equivalent employees | Employees		103,100
Percentage of employees covered by collective bargaining agreements with various labor unions		84.00%
American Airlines, Inc. [Member] | EETC Leveraged Lease Financings [Member]
Long-term Purchase Commitment [Line Items]
Operating leases future minimum payments		$ 572,000,000
American Airlines, Inc. [Member] | Special Facility Revenue Bonds [Member]
Long-term Purchase Commitment [Line Items]
Operating leases future minimum payments		589,000,000
American Airlines, Inc. [Member] | Enhanced Equipment Trust Certificates (EETC) [Member]
Long-term Purchase Commitment [Line Items]
EETC Carrying Value		11,900,000,000
American Airlines, Inc. [Member] | Unsecured Debt [Member] | Senior Notes 6.125% Due in 2018 [Member]
Long-term Purchase Commitment [Line Items]
Guarantor obligations, maximum exposure, undiscounted		500,000,000
American Airlines, Inc. [Member] | Unsecured Debt [Member] | Senior Notes 5.50% Due in 2019 [Member]
Long-term Purchase Commitment [Line Items]
Guarantor obligations, maximum exposure, undiscounted		750,000,000
American Airlines, Inc. [Member] | Unsecured Debt [Member] | Senior Notes 4.625% Due in 2020 [Member]
Long-term Purchase Commitment [Line Items]
Guarantor obligations, maximum exposure, undiscounted		500,000,000
American Airlines, Inc. [Member] | Restricted Cash [Member]
Long-term Purchase Commitment [Line Items]
Letters of credit outstanding and surety bonds, amount		$ 88,000,000

Supplemental Cash Flow Inform97

Supplemental Cash Flow Information - Cash Flow Information and Non-Cash Investing and Financing Activities (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Non-cash investing and financing activities:
Equity investment	$ 120	$ 0	$ 0
Settlement of bankruptcy obligations	15	3	63
Capital lease obligations	0	0	5
Supplemental information:
Interest paid, net of amounts capitalized	1,040	964	873
Income taxes paid	20	16	20
American Airlines, Inc. [Member]
Non-cash investing and financing activities:
Equity investment	120	0	0
Settlement of bankruptcy obligations	15	3	63
Capital lease obligations	0	0	5
Supplemental information:
Interest paid, net of amounts capitalized	942	867	787
Income taxes paid	$ 18	$ 14	$ 19

Operating Segments and Relate98

Operating Segments and Related Disclosures - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017Segments
Segment Reporting Information [Line Items]
Number of operating segments	1
American Airlines, Inc. [Member]
Segment Reporting Information [Line Items]
Number of operating segments	1

Operating Segments and Relate99

Operating Segments and Related Disclosures - Operating Revenues by Geographic Region (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Operating revenues	$ 10,600	$ 10,878	$ 11,105	$ 9,624	$ 9,789	$ 10,594	$ 10,363	$ 9,435	$ 42,207	$ 40,180	$ 40,990
DOT Domestic [Member]
Segment Reporting Information [Line Items]
Operating revenues									29,612	28,620	28,761
DOT Latin America [Member]
Segment Reporting Information [Line Items]
Operating revenues									5,422	4,995	5,539
DOT Atlantic [Member]
Segment Reporting Information [Line Items]
Operating revenues									5,059	4,769	5,146
DOT Pacific [Member]
Segment Reporting Information [Line Items]
Operating revenues									2,114	1,796	1,544
American Airlines, Inc. [Member]
Segment Reporting Information [Line Items]
Operating revenues	$ 10,597	$ 10,875	$ 11,102	$ 9,621	$ 9,786	$ 10,591	$ 10,360	$ 9,427	42,195	40,163	40,938
American Airlines, Inc. [Member] | DOT Domestic [Member]
Segment Reporting Information [Line Items]
Operating revenues									29,600	28,603	28,709
American Airlines, Inc. [Member] | DOT Latin America [Member]
Segment Reporting Information [Line Items]
Operating revenues									5,422	4,995	5,539
American Airlines, Inc. [Member] | DOT Atlantic [Member]
Segment Reporting Information [Line Items]
Operating revenues									5,059	4,769	5,146
American Airlines, Inc. [Member] | DOT Pacific [Member]
Segment Reporting Information [Line Items]
Operating revenues									$ 2,114	$ 1,796	$ 1,544

Share Based Compensation - Addi

Share Based Compensation - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation costs	$ 90	$ 102	$ 274
Common stock shares withheld or sold related to tax obligations	1,100,000	1,400,000	7,000,000
Payment of certain tax withholding obligations associated with employee equity awards	$ 51	$ 56	$ 306
Special Items, Net [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation costs			198
AAG Incentive Award Plan 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares available for grant under 2013 Plan				40,000,000
American Airlines, Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation costs	$ 90	$ 102	$ 274
Common stock shares withheld or sold related to tax obligations	1,100,000	1,400,000	7,000,000
Payment of certain tax withholding obligations associated with employee equity awards	$ 51	$ 56	$ 306
American Airlines, Inc. [Member] | Special Items, Net [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation costs			$ 198
American Airlines, Inc. [Member] | AAG Incentive Award Plan 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total shares available for grant under 2013 Plan				40,000,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU, vesting period (in years)	3 years
Restricted Stock Units (RSUs) [Member] | American Airlines, Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU, vesting period (in years)	3 years

Share Based Compensation - Rest

Share Based Compensation - Restricted Stock Unit Awards (Detail) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Number of Shares [Roll Forward]
Number of Shares, Beginning Balance (in shares)	5,187	5,607	21,342
Number of Shares, Granted (in shares)	2,309	2,655	2,213
Number of Shares, Vested and released (in shares)	(2,708)	(2,754)	(17,163)
Number of Shares, Forfeited (in shares)	(464)	(321)	(785)
Number of Shares, Ending balance (in shares)	4,324	5,187	5,607
Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, Beginning Balance (in dollars per share)	$ 41.48	$ 38.08	$ 26.43
Weighted Average Grant Date Fair Value, Granted (in dollars per share)	48.58	41.34	46.62
Weighted Average Grant Date Fair Value, Vested and released (in dollars per share)	39.63	34.83	25.20
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share)	44.48	40.15	27.12
Weighted Average Grant Date Fair Value, Ending balance (in dollars per share)	$ 46.94	$ 41.48	$ 38.08
Unrecognized compensation cost	$ 121
Recognition period	1 year
Total fair value of stock-settled during the year	$ 123	$ 107	$ 750
American Airlines, Inc. [Member]
Number of Shares [Roll Forward]
Number of Shares, Beginning Balance (in shares)	5,187	5,607	21,342
Number of Shares, Granted (in shares)	2,309	2,655	2,213
Number of Shares, Vested and released (in shares)	(2,708)	(2,754)	(17,163)
Number of Shares, Forfeited (in shares)	(464)	(321)	(785)
Number of Shares, Ending balance (in shares)	4,324	5,187	5,607
Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, Beginning Balance (in dollars per share)	$ 41.48	$ 38.08	$ 26.43
Weighted Average Grant Date Fair Value, Granted (in dollars per share)	48.58	41.34	46.62
Weighted Average Grant Date Fair Value, Vested and released (in dollars per share)	39.63	34.83	25.20
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share)	44.48	40.15	27.12
Weighted Average Grant Date Fair Value, Ending balance (in dollars per share)	$ 46.94	$ 41.48	$ 38.08
Unrecognized compensation cost	$ 121
Recognition period	1 year
Total fair value of stock-settled during the year	$ 123	$ 107	$ 750

Share-based Compensation Share-

Share-based Compensation Share-based Compensation - Stock Appreciation Rights (Detail) - Stock Appreciation Rights (SARs) [Member] $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2016USD ($)$ / sharesshares	Dec. 31, 2015USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award exchange ratio in connection with the Merger	1
Vesting period	3 years
Non-Option equity instruments, exercised (in shares | shares	0.8	1.7	3
Exercised in period, weighted average exercise price (in usd per share) | $ / shares	$ 15.71	$ 14.49	$ 12.09
Aggregate intrinsic value, shares exercised | $	$ 27	$ 49	$ 102
Non-Option equity instruments, outstanding (in shares) | shares	1.2
Aggregate intrinsic value, outstanding | $	$ 54
Weighted average grant date fair value (in dollars per share) | $ / shares	$ 8.08
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of contractual expiration period for stock-based awards	7 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of contractual expiration period for stock-based awards	10 years
American Airlines, Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award exchange ratio in connection with the Merger	1
Vesting period	3 years
Non-Option equity instruments, exercised (in shares | shares	0.8	1.7	3
Exercised in period, weighted average exercise price (in usd per share) | $ / shares	$ 15.71	$ 14.49	$ 12.09
Aggregate intrinsic value, shares exercised | $	$ 27	$ 49	$ 102
Non-Option equity instruments, outstanding (in shares) | shares	1.2
Aggregate intrinsic value, outstanding | $	$ 54
Weighted average grant date fair value (in dollars per share) | $ / shares	$ 8.08
American Airlines, Inc. [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of contractual expiration period for stock-based awards	7 years
American Airlines, Inc. [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of contractual expiration period for stock-based awards	10 years

Share-based Compensation Sha103

Share-based Compensation Share-based Compensation - ASU 2016-09 (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net deferred tax asset	$ 394	$ 1,487
American Airlines, Inc. [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net deferred tax asset	$ 647	$ 1,898
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net deferred tax asset			$ 418
Accounting Standards Update 2016-09 [Member] | American Airlines, Inc. [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net deferred tax asset			418
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption			418
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member] | American Airlines, Inc. [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption			$ 418

Valuation and Qualifying Acc104

Valuation and Qualifying Accounts - Components of Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Obsolescence of Spare Parts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 765	$ 728	$ 673
Changes charged to statement of operations accounts	29	37	50
Write-offs (net of recoveries)	(4)	(3)	(4)
Sales, retirements and transfers	(21)	3	9
Balance at end of year	769	765	728
Allowance for Uncollectible Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	36	41	17
Changes charged to statement of operations accounts	43	47	46
Write-offs (net of recoveries)	(55)	(52)	(22)
Balance at end of year	24	36	41
American Airlines, Inc. [Member] | Allowance for Obsolescence of Spare Parts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	720	689	638
Changes charged to statement of operations accounts	18	28	42
Sales, retirements and transfers	(21)	3	9
Balance at end of year	717	720	689
American Airlines, Inc. [Member] | Allowance for Uncollectible Accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	35	37	14
Changes charged to statement of operations accounts	41	47	45
Write-offs (net of recoveries)	(55)	(49)	(22)
Balance at end of year	$ 21	$ 35	$ 37

Quarterly Financial Data - Summ

Quarterly Financial Data - Summarized Financial Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Selected Quarterly Financial Information [Line Items]
Operating revenues	$ 10,600	$ 10,878	$ 11,105	$ 9,624	$ 9,789	$ 10,594	$ 10,363	$ 9,435	$ 42,207	$ 40,180	$ 40,990
Operating expenses	9,910	9,646	9,570	9,023	9,022	9,163	8,612	8,100	38,149	34,896	34,786
Operating income	690	1,232	1,535	601	767	1,431	1,751	1,335	4,058	5,284	6,204
Net income	$ 258	$ 624	$ 803	$ 234	$ 289	$ 737	$ 950	$ 700	$ 1,919	$ 2,676	$ 7,610
Earnings per share:
Basic (in dollars per share)	$ 0.54	$ 1.29	$ 1.64	$ 0.46	$ 0.56	$ 1.40	$ 1.69	$ 1.15	$ 3.92	$ 4.85	$ 11.39
Diluted (in dollars per share)	$ 0.54	$ 1.28	$ 1.63	$ 0.46	$ 0.56	$ 1.40	$ 1.68	$ 1.14	$ 3.90	$ 4.81	$ 11.07
Shares used for computation (in thousands):
Basic (in shares)	477,165	484,772	490,818	503,902	514,571	525,415	563,000	606,245	489,164	552,308	668,393
Diluted (in shares)	479,382	486,625	492,965	507,797	518,358	528,510	566,040	611,488	491,692	556,099	687,355
American Airlines, Inc. [Member]
Selected Quarterly Financial Information [Line Items]
Operating revenues	$ 10,597	$ 10,875	$ 11,102	$ 9,621	$ 9,786	$ 10,591	$ 10,360	$ 9,427	$ 42,195	$ 40,163	$ 40,938
Operating expenses	9,921	9,650	9,575	9,017	8,995	9,159	8,603	8,104	38,163	34,859	34,749
Operating income	676	1,225	1,527	604	791	1,432	1,757	1,323	4,032	5,304	6,189
Net income	$ 183	$ 649	$ 827	$ 263	$ 341	$ 758	$ 972	$ 710	$ 1,922	$ 2,781	$ 8,120

Quarterly Financial Data - Addi

Quarterly Financial Data - Additional Information (Detail) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2017USD ($)$ / Employees	Dec. 31, 2016USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Restructuring Cost and Reserve [Line Items]
Operating and nonoperating special charges, net	$ 307	$ 273
Employee tax reform bonus expense	$ 149
Tax reform bonus, amount per employee | $ / Employees	1,000
Merger integration expenses	$ 81	121	$ 273	$ 514	$ 826
Fleet restructuring expenses	58	104	232	177	210
Net charge resulting from fair value adjustments to bankruptcy obligations	20	47
Impact of the 2017 Tax Act on deferred tax assets and liabilities	(7)		(7)	0	0
American Airlines, Inc. [Member]
Restructuring Cost and Reserve [Line Items]
Operating and nonoperating special charges, net	384	273
Employee tax reform bonus expense	$ 123
Tax reform bonus, amount per employee | $ / Employees	1,000
Merger integration expenses	$ 81	121	273	514	826
Fleet restructuring expenses	58	104	232	177	210
Net charge resulting from fair value adjustments to bankruptcy obligations	20	$ 47
Impact of the 2017 Tax Act on deferred tax assets and liabilities	$ 93		$ 93	$ 0	$ 0

Subsequent Event - Additional I

Subsequent Event - Additional Information (Detail) - $ / shares

1 Months Ended

3 Months Ended

12 Months Ended

Jan. 31, 2018

Dec. 31, 2017

Sep. 30, 2017

Jun. 30, 2017

Mar. 31, 2017

Dec. 31, 2016

Sep. 30, 2016

Jun. 30, 2016

Mar. 31, 2016

Dec. 31, 2015

Sep. 30, 2015

Jun. 30, 2015

Mar. 31, 2015

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Subsequent Event [Line Items]

Common stock dividends per share declared (in dollars per share)

$ 0.10

$ 0.1

$ 0.1

$ 0.1

$ 0.1

$ 0.1

$ 0.1

$ 0.1

$ 0.1

$ 0.1

$ 0.1

$ 0.1

$ 0.40

$ 0.40

$ 0.40

Subsequent Event [Member]

Subsequent Event [Line Items]

Common stock dividends per share declared (in dollars per share)

$ 0.10

Transactions with Related Pa108

Transactions with Related Parties (Detail) - American Airlines, Inc. [Member] - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Net receivables (payables) to related parties	$ 8,822	$ 6,810
AAG [Member]
Related Party Transaction [Line Items]
Net receivables (payables) to related parties	10,968	8,981
AAG's Wholly-owned Subsidiaries [Member]
Related Party Transaction [Line Items]
Net receivables (payables) to related parties	$ (2,146)	$ (2,171)

Transactions with Related Pa109

Transactions with Related Parties - Additional Information (Detail) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
American Airlines, Inc. [Member] | Regional Carrier [Member] | AAG's Wholly-owned Subsidiaries [Member] | Airline Capacity Purchase Arrangements [Member]
Related Party Transaction [Line Items]
Related party transaction, expense recognized	$ 1.7	$ 1.5	$ 1.2