American Airlines (AAL) 10-K 25 Feb 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2018	Feb. 20, 2019	Jun. 30, 2018
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
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 Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		449,055,548
Entity Public Float			$ 17
American Airlines, Inc. [Member]
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
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 Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
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, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating revenues:
Total operating revenues	$ 44,541	$ 42,622	$ 40,142
Operating expenses:
Aircraft fuel and related taxes	8,053	6,128	5,071
Salaries, wages and benefits	12,251	11,954	10,967
Regional expenses	7,133	6,546	6,044
Maintenance, materials and repairs	2,050	1,959	1,834
Other rent and landing fees	1,900	1,806	1,772
Aircraft rent	1,264	1,197	1,203
Selling expenses	1,520	1,477	1,323
Depreciation and amortization	1,839	1,702	1,525
Special items, net	787	712	709
Other	5,088	4,910	4,634
Total operating expenses	41,885	38,391	35,082
Operating income	2,656	4,231	5,060
Nonoperating income (expense):
Interest income	118	94	63
Interest expense, net	(1,056)	(1,053)	(991)
Other income, net	166	123	20
Total nonoperating expense, net	(772)	(836)	(908)
Income before income taxes	1,884	3,395	4,152
Income tax provision	472	2,113	1,568
Net income	$ 1,412	$ 1,282	$ 2,584
Earnings per common share:
Basic (in dollars per share)	$ 3.04	$ 2.62	$ 4.68
Diluted (in dollars per share)	$ 3.03	$ 2.61	$ 4.65
Weighted average shares outstanding:
Basic (in shares)	464,236	489,164	552,308
Diluted (in shares)	465,660	491,692	556,099
Cash dividends declared per common share	$ 0.4	$ 0.4	$ 0.4
Passenger [Member]
Operating revenues:
Total operating revenues	$ 40,676	$ 39,131	$ 37,045
Cargo [Member]
Operating revenues:
Total operating revenues	1,013	890	785
Other [Member]
Operating revenues:
Total operating revenues	2,852	2,601	2,312
American Airlines, Inc. [Member]
Operating revenues:
Total operating revenues	44,530	42,610	40,125
Operating expenses:
Aircraft fuel and related taxes	8,053	6,128	5,071
Salaries, wages and benefits	12,240	11,942	10,958
Regional expenses	7,064	6,572	6,009
Maintenance, materials and repairs	2,050	1,959	1,834
Other rent and landing fees	1,900	1,806	1,772
Aircraft rent	1,264	1,197	1,203
Selling expenses	1,520	1,477	1,323
Depreciation and amortization	1,839	1,702	1,525
Special items, net	787	712	709
Other	5,090	4,910	4,641
Total operating expenses	41,807	38,405	35,045
Operating income	2,723	4,205	5,080
Nonoperating income (expense):
Interest income	330	215	104
Interest expense, net	(1,028)	(988)	(906)
Other income, net	167	123	18
Total nonoperating expense, net	(531)	(650)	(784)
Income before income taxes	2,192	3,555	4,296
Income tax provision	534	2,270	1,607
Net income	1,658	1,285	2,689
American Airlines, Inc. [Member] | Passenger [Member]
Operating revenues:
Total operating revenues	40,676	39,131	37,045
American Airlines, Inc. [Member] | Cargo [Member]
Operating revenues:
Total operating revenues	1,013	890	785
American Airlines, Inc. [Member] | Other [Member]
Operating revenues:
Total operating revenues	$ 2,841	$ 2,589	$ 2,295

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income	$ 1,412	$ 1,282	$ 2,584
Other comprehensive income (loss), net of tax:
Pension, retiree medical and other postretirement benefits	(117)	(70)	(358)
Investments	(3)	(1)	7
Total other comprehensive loss, net of tax	(120)	(71)	(351)
Total comprehensive income	1,292	1,211	2,233
American Airlines, Inc. [Member]
Net income	1,658	1,285	2,689
Other comprehensive income (loss), net of tax:
Pension, retiree medical and other postretirement benefits	(116)	(68)	(357)
Investments	(3)	(1)	6
Total other comprehensive loss, net of tax	(119)	(69)	(351)
Total comprehensive income	$ 1,539	$ 1,216	$ 2,338

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash	$ 275	$ 295
Short-term investments	4,485	4,771
Restricted cash and short-term investments	154	318
Accounts receivable, net	1,706	1,752
Aircraft fuel, spare parts and supplies, net	1,522	1,359
Prepaid expenses and other	495	651
Total current assets	8,637	9,146
Operating property and equipment
Flight equipment	41,499	40,318
Ground property and equipment	8,764	8,267
Equipment purchase deposits	1,278	1,217
Total property and equipment, at cost	51,541	49,802
Less accumulated depreciation and amortization	(17,443)	(15,646)
Total property and equipment, net	34,098	34,156
Operating lease right-of-use assets	9,151	0
Other assets
Goodwill	4,091	4,091
Intangibles, net of accumulated amortization of $663 and $622, respectively	2,137	2,203
Deferred tax asset	1,145	1,816
Other assets	1,321	1,373
Total other assets	8,694	9,483
Total assets	60,580	52,785
Current liabilities
Current maturities of long-term debt and finance leases	3,294	2,554
Accounts payable	1,773	1,688
Accrued salaries and wages	1,427	1,672
Operating lease liabilities	1,654	0
Other accrued liabilities	2,342	2,281
Total current liabilities	18,096	15,358
Noncurrent liabilities
Long-term debt and finance leases, net of current maturities	21,179	22,511
Pension and postretirement benefits	6,907	7,497
Loyalty program liability	5,272	5,701
Operating lease liabilities	7,902	0
Other liabilities	1,393	2,498
Total noncurrent liabilities	42,653	38,207
Stockholders' equity (deficit)
Common stock	5	5
Additional paid-in capital	4,964	5,714
Accumulated other comprehensive loss	(5,274)	(5,154)
Retained earnings (deficit)	136	(1,345)
Total stockholders' deficit	(169)	(780)
Total liabilities and stockholders’ equity (deficit)	60,580	52,785
Air traffic [Member]
Current liabilities
Customer liabilities	4,339	4,042
Loyalty program [Member]
Current liabilities
Customer liabilities	3,267	3,121
Noncurrent liabilities
Loyalty program liability		5,701
American Airlines, Inc. [Member]
Current assets
Cash	265	287
Short-term investments	4,482	4,768
Restricted cash and short-term investments	154	318
Accounts receivable, net	1,755	1,755
Receivables from related parties, net	10,666	8,822
Aircraft fuel, spare parts and supplies, net	1,442	1,294
Prepaid expenses and other	493	647
Total current assets	19,257	17,891
Operating property and equipment
Flight equipment	41,180	39,993
Ground property and equipment	8,466	8,006
Equipment purchase deposits	1,277	1,217
Total property and equipment, at cost	50,923	49,216
Less accumulated depreciation and amortization	(17,123)	(15,354)
Total property and equipment, net	33,800	33,862
Operating lease right-of-use assets	9,094	0
Other assets
Goodwill	4,091	4,091
Intangibles, net of accumulated amortization of $663 and $622, respectively	2,137	2,203
Deferred tax asset	1,280	2,071
Other assets	1,219	1,283
Total other assets	8,727	9,648
Total assets	70,878	61,401
Current liabilities
Current maturities of long-term debt and finance leases	2,547	2,058
Accounts payable	1,707	1,625
Accrued salaries and wages	1,363	1,613
Operating lease liabilities	1,639	0
Other accrued liabilities	2,259	2,209
Total current liabilities	17,121	14,668
Noncurrent liabilities
Long-term debt and finance leases, net of current maturities	20,650	21,236
Pension and postretirement benefits	6,863	7,452
Loyalty program liability	5,272	5,701
Operating lease liabilities	7,857	0
Other liabilities	1,345	2,456
Total noncurrent liabilities	41,987	36,845
Commitments and contingencies
Stockholders' equity (deficit)
Common stock	0	0
Additional paid-in capital	16,802	16,716
Accumulated other comprehensive loss	(5,370)	(5,251)
Retained earnings (deficit)	338	(1,577)
Total stockholders' deficit	11,770	9,888
Total liabilities and stockholders’ equity (deficit)	70,878	61,401
American Airlines, Inc. [Member] | Air traffic [Member]
Current liabilities
Customer liabilities	4,339	4,042
American Airlines, Inc. [Member] | Loyalty program [Member]
Current liabilities
Customer liabilities	$ 3,267	3,121
Noncurrent liabilities
Loyalty program liability		$ 5,701

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Accumulated amortization of intangibles	$ 663	$ 622
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,750,000,000	1,750,000,000
Common stock, shares outstanding (in shares)	460,610,870	475,507,887
American Airlines, Inc. [Member]
Accumulated amortization of intangibles	$ 663	$ 622
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	1,000	1,000
Common stock, shares issued (in shares)	1,000	1,000
Common stock, shares outstanding (in shares)	1,000	1,000

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Cash flows from operating activities:
Net income		$ 1,412		$ 1,282		$ 2,584
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization		2,159		2,017		1,818
Debt discount and lease amortization		(92)		(114)		(119)
Special items, non-cash		458		272		270
Pension and postretirement		(300)		(132)		(68)
Deferred income tax provision		440		2,089		1,556
Share-based compensation		86		90		100
Other, net		(64)		(39)		(18)
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable		222		(190)		(160)
Increase in other assets		(390)		(433)		(184)
Increase (decrease) in accounts payable and accrued liabilities		(147)		299		307
Contributions to pension plans		(475)		(286)		(32)
Increase (decrease) in other liabilities		210		132		(105)
Net cash provided by operating activities		3,533		4,744		6,524
Cash flows from investing activities:
Capital expenditures and aircraft purchase deposits		(3,745)		(5,971)		(5,731)
Proceeds from sale of property and equipment and sale-leaseback transactions		1,207		947		125
Purchases of short-term investments		(3,412)		(4,633)		(6,241)
Sales of short-term investments		3,705		5,915		6,092
Proceeds from sale of investments		207		0		0
Decrease in restricted short-term investments		72		309		53
Purchase of equity investment		0		(203)		0
Other investing activities		(7)		0		0
Net cash used in investing activities		(1,973)		(3,636)		(5,702)
Cash flows from financing activities:
Proceeds from issuance of long-term debt		2,354		3,058		7,701
Payments on long-term debt and finance leases		(2,941)		(2,332)		(3,827)
Deferred financing costs		(59)		(85)		(77)
Treasury stock repurchases		(837)		(1,615)		(4,500)
Dividend payments		(186)		(198)		(224)
Other financing activities		(3)		27		33
Net cash used in financing activities		(1,672)		(1,145)		(894)
Net decrease in cash and restricted cash		(112)		(37)		(72)
Cash and restricted cash at beginning of year		398	[1]	435	[1]	507
Cash and restricted cash at end of year (a)	[1]	286		398		435
American Airlines, Inc. [Member]
Cash flows from operating activities:
Net income		1,658		1,285		2,689
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization		2,108		1,964		1,762
Debt discount and lease amortization		(97)		(119)		(124)
Special items, non-cash		458		272		270
Pension and postretirement		(302)		(132)		(70)
Deferred income tax provision		503		2,246		1,597
Share-based compensation		86		90		100
Other, net		(62)		(25)		(16)
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable		232		(189)		(169)
Increase in other assets		(354)		(405)		(205)
Increase (decrease) in accounts payable and accrued liabilities		(171)		266		336
Increase in receivables from related parties, net		(1,849)		(1,994)		(4,862)
Contributions to pension plans		(472)		(286)		(32)
Increase (decrease) in other liabilities		191		140		(101)
Net cash provided by operating activities		1,943		2,870		1,750
Cash flows from investing activities:
Capital expenditures and aircraft purchase deposits		(3,677)		(5,881)		(5,657)
Proceeds from sale of property and equipment and sale-leaseback transactions		1,202		922		115
Purchases of short-term investments		(3,412)		(4,633)		(6,241)
Sales of short-term investments		3,705		5,915		6,092
Proceeds from sale of investments		207		0		0
Decrease in restricted short-term investments		72		309		53
Purchase of equity investment		0		(203)		0
Other investing activities		(7)		0		0
Net cash used in investing activities		(1,910)		(3,571)		(5,638)
Cash flows from financing activities:
Proceeds from issuance of long-term debt		2,354		3,058		7,701
Payments on long-term debt and finance leases		(2,442)		(2,332)		(3,827)
Deferred financing costs		(59)		(85)		(77)
Other financing activities		0		27		33
Net cash used in financing activities		(147)		668		3,830
Net decrease in cash and restricted cash		(114)		(33)		(58)
Cash and restricted cash at beginning of year		390	[2]	423	[2]	481
Cash and restricted cash at end of year (a)	[2]	276		390		423
Air traffic [Member]
Changes in operating assets and liabilities:
Increase (decrease) in customer liabilities		297		65		158
Air traffic [Member] | American Airlines, Inc. [Member]
Changes in operating assets and liabilities:
Increase (decrease) in customer liabilities		297		65		158
Loyalty program [Member]
Changes in operating assets and liabilities:
Increase (decrease) in customer liabilities		(283)		(308)		417
Loyalty program [Member] | American Airlines, Inc. [Member]
Changes in operating assets and liabilities:
Increase (decrease) in customer liabilities		$ (283)		$ (308)		$ 417
[1]	The following table provides a reconciliation of cash and restricted cash to amounts reported within the consolidated balance sheets:Cash$275 $295 $322Restricted cash included in restricted cash and short-term investments11 103 113Total cash and restricted cash$286 $398 $435
[2]	The following table provides a reconciliation of cash and restricted cash to amounts reported within the consolidated balance sheets:Cash$265 $287 $310Restricted cash included in restricted cash and short-term investments11 103 113Total cash and restricted cash$276 $390 $423

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Cash	$ 275		$ 295		$ 322
Restricted cash included in restricted cash and short-term investments	11		103		113
Total cash and restricted cash	286	[1]	398	[1]	435	[1]	$ 507
American Airlines, Inc. [Member]
Cash	265		287		310
Restricted cash included in restricted cash and short-term investments	11		103		113
Total cash and restricted cash	$ 276	[2]	$ 390	[2]	$ 423	[2]	$ 481
[1]	The following table provides a reconciliation of cash and restricted cash to amounts reported within the consolidated balance sheets:Cash$275 $295 $322Restricted cash included in restricted cash and short-term investments11 103 113Total cash and restricted cash$286 $398 $435
[2]	The following table provides a reconciliation of cash and restricted cash to amounts reported within the consolidated balance sheets:Cash$265 $287 $310Restricted cash included in restricted cash and short-term investments11 103 113Total cash and restricted cash$276 $390 $423

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	American Airlines, Inc. [Member]	Common Stock [Member]	Common Stock [Member]American Airlines, Inc. [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member]American Airlines, Inc. [Member]	Accumulated Other Comprehensive Loss [Member]	Accumulated Other Comprehensive Loss [Member]American Airlines, Inc. [Member]	Retained Earnings (Deficit) [Member]	Retained Earnings (Deficit) [Member]American Airlines, Inc. [Member]
Beginning Balance at Dec. 31, 2015	$ 5,635	$ 9,698	$ 6	$ 0	$ 11,591	$ 16,521	$ (4,732)	$ (4,831)	$ (1,230)	$ (1,992)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,584	2,689							2,584	2,689
Other comprehensive loss	(351)	(351)					(351)	(351)
Cash tax withholding on shares issued	(56)				(56)
Purchase and retirement of AAG common stock	(4,416)		(1)		(4,415)
Dividends declared on AAG 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
Ending Balance at Dec. 31, 2016	(284)	8,580	5	0	7,223	16,624	(5,083)	(5,182)	(2,429)	(2,862)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,282	1,285							1,282	1,285
Other comprehensive loss	(71)	(69)					(71)	(69)
Cash tax withholding on shares issued	(51)				(51)
Purchase and retirement of AAG common stock	(1,563)				(1,563)
Dividends declared on AAG 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
Ending Balance at Dec. 31, 2017	(780)	9,888	5	0	5,714	16,716	(5,154)	(5,251)	(1,345)	(1,577)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,412	1,658							1,412	1,658
Other comprehensive loss	(120)	(119)					(120)	(119)
Cash tax withholding on shares issued	(37)				(37)
Purchase and retirement of AAG common stock	(799)				(799)
Dividends declared on AAG common stock	(188)								(188)
Share-based compensation expense	86	86			86	86
Ending Balance at Dec. 31, 2018	$ (169)	$ 11,770	$ 5	$ 0	$ 4,964	$ 16,802	$ (5,274)	$ (5,370)	$ 136	$ 338

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Purchase and retirement of common stock (in shares)		33,953,127
Purchase and retirement of common stock (in shares)	16,606,157	33,900,000	119,823,621
Dividends declared on common stock (in dollars per share)	$ 0.4	$ 0.4	$ 0.4
Issuance of shares of common stock pursuant to employee stock plans (in shares)	1,709,140	2,166,861	2,506,067

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
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), PSA Airlines, Inc. (PSA) and Piedmont Airlines, Inc. (Piedmont) 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. 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, as well as pension and retiree medical and other postretirement benefits. (b) Recent Accounting Pronouncements Standards Adopted in 2018 Effective January 1, 2018, we adopted the accounting pronouncements described below. 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 adopted the New Revenue Standard using the full retrospective method, which resulted in the recast of prior reporting periods. The adoption of the New Revenue Standard impacted our accounting for outstanding mileage credits earned through travel by AAdvantage loyalty program members. There was no change in accounting for sales of mileage credits to co-branded credit card or other partners. Prior to the adoption of the New Revenue Standard, 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. The New Revenue Standard required 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 also required 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 required a gross presentation on the face of our consolidated statements of operations for certain revenues and expenses that had previously been presented on a net basis. See “Impacts to 2017 Results” and “Impacts to 2016 Results” below for the impact to our consolidated statements of operations data for 2017 and 2016, respectively, and our consolidated balance sheet as of December 31, 2017 related to the adoption of the New Revenue Standard. 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 required 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 was applied retrospectively, which resulted in the recast of each prior reporting period presented. The adoption of the New Retirement Standard had no impact on pre-tax income or net income reported. See “Impacts to 2017 Results” and “Impacts to 2016 Results” below for the impact to our consolidated statements of operations data for 2017 and 2016, respectively, related to the adoption of the New Retirement Standard. 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 (ROU) asset on the balance sheet for operating leases. Accounting for finance leases is substantially unchanged. 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. In the fourth quarter of 2018, we elected to early adopt the New Lease Standard as of January 1, 2018 using a modified retrospective transition, with the cumulative-effect adjustment to the opening balance of retained earnings as of the effective date (the effective date method). Under the effective date method, financial results reported in periods prior to 2018 are unchanged. We also elected the package of practical expedients, which among other things, does not require reassessment of lease classification. The adoption of the New Lease Standard had a significant impact on our consolidated balance sheet due to the recognition of approximately $10 billion of lease liabilities with corresponding right-of-use assets for operating leases. Additionally, we recognized a $197 million cumulative effect adjustment credit, net of tax, to retained earnings. The adjustment to retained earnings was driven principally by sale-leaseback transactions including the recognition of unamortized deferred aircraft sale-leaseback gains. Prior to the adoption of the New Lease Standard, gains on sale-leaseback transactions were generally deferred and recognized in the income statement over the lease term. Under the New Lease Standard, gains on sale-leaseback transactions (subject to adjustment for off-market terms) are recognized immediately. ASU 2016-01: Financial Instruments - Overall (Subtopic 825-10) This ASU made several modifications to Subtopic 825-10, including the elimination of the available-for-sale classification of equity investments, and it required equity investments with readily determinable fair values to be measured at fair value with changes in fair value recognized in net income. This standard was adopted prospectively as of January 1, 2018 and resulted in a $60 million cumulative effect adjustment credit to retained earnings, net of tax, related to our investment in China Southern Airlines Company Limited (China Southern Airlines), which was previously accounted for under the cost method. ASU 2016-18: Statement of Cash Flows (Topic 230): Restricted Cash This ASU required that the change in the total cash balance, cash at the beginning of the period and cash at the end of the period on the statement of cash flows include restricted cash, and also required companies that report cash and restricted cash separately on the balance sheet to reconcile those amounts to the statement of cash flows. This standard was applied retrospectively, which resulted in the recast of prior reporting periods in the statement of cash flows. For the years ended December 31, 2018 , 2017 and 2016 , $11 million , $103 million and $113 million , respectively, of restricted cash is included in the total cash and restricted cash balance at the end of the period. A reconciliation of cash and restricted cash reported on our consolidated statements of cash flows to the amounts reported on our consolidated balance sheets is provided in a table below the Consolidated Statements of Cash Flows . Impacts to 2017 Results The effects of the adoption of the New Revenue Standard and New Retirement Standard to our consolidated statement of operations for the twelve months ended December 31, 2017 were as follows (in millions): New Revenue Standard New Retirement Standard Year Ended As Reported Deferred Revenue Method Ancillary Revenue Reclassifications Gross Versus Net Presentation Reclassifications As Recast Operating revenues: Passenger $ 36,133 $ 311 $ 2,648 $ 39 $ — $ 39,131 Cargo 800 — 42 48 — 890 Other 5,274 — (2,690 ) 17 — 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 $823 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 effects of the adoption of the New Revenue Standard to our December 31, 2017 consolidated balance sheet were as follows (in millions): 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 2,791 330 3,121 Noncurrent loyalty program liability — 5,701 5,701 Total stockholders’ equity (deficit) 3,926 (4,706 ) (780 ) Impacts to 2016 Results The effects of the adoption of the New Revenue Standard and New Retirement Standard to our consolidated statement of operations for the twelve months ended December 31, 2016 were as follows (in millions): New Revenue Standard New Retirement Standard Year Ended As Reported Deferred Revenue Method Ancillary Revenue Reclassifications Gross Versus Net Presentation Reclassifications As Recast Operating revenues: Passenger $ 34,579 $ (147 ) $ 2,571 $ 42 $ — $ 37,045 Cargo 700 — 36 49 — 785 Other 4,901 — (2,607 ) 18 — 2,312 Total operating revenues 40,180 (147 ) — 109 — 40,142 Total operating expenses 34,896 — — 109 77 35,082 Operating income 5,284 (147 ) — — (77 ) 5,060 Total nonoperating expense, net (985 ) — — — 77 (908 ) Income before income taxes 4,299 (147 ) — — — 4,152 Income tax provision 1,623 (55 ) — — — 1,568 Net income $ 2,676 $ (92 ) $ — $ — $ — $ 2,584 Diluted earnings per common share $ 4.81 $ 4.65 Standards Effective for 2019 Reporting Periods ASU 2018-02: Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income This ASU provides financial statement preparers with an option to reclassify stranded tax effects within accumulated other comprehensive income to retained earnings due to the U.S. federal corporate income tax rate change as a result of the 2017 Tax Act. The amount of the reclassification is the difference between the amount initially charged or credited directly to other comprehensive income at the previously enacted U.S. federal corporate income tax rate that remains in accumulated other comprehensive income and the amount that would have been charged or credited directly to other comprehensive income using the newly enacted U.S. federal corporate income tax rate, excluding the effect of any valuation allowance previously charged to income from continuing operations. This standard is effective for interim and annual reporting periods beginning after December 15, 2018, and early adoption is permitted. We will adopt this standard effective January 1, 2019. The adoption of the standard may impact tax amounts stranded in accumulated other comprehensive income related to our pension and retiree medical and other postretirement benefit plans. (c) 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 our consolidated statements of operations. Unrealized gains and losses are recorded in accumulated other comprehensive loss on our consolidated balance sheets. (d) Restricted Cash and Short-term Investments We have restricted cash and short-term investments related primarily to collateral held to support workers’ compensation obligations. (e) 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. (f) 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 $2.4 billion , $2.2 billion and $1.9 billion for the years ended December 31, 2018 , 2017 and 2016 , respectively. (g) Leases We determine if an arrangement is a lease at inception. Operating leases are included in operating lease ROU assets, current operating lease liabilities and noncurrent operating lease liabilities in our consolidated balance sheet. Finance leases are included in property and equipment, current maturities of long-term debt and finance leases and long-term debt and finance leases, net of current maturities, in our consolidated balance sheet. ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and liabilities are recognized at the lease commencement date based on the estimated present value of lease payments over the lease term. We use our estimated incremental borrowing rate, which is derived from information available at the lease commencement date , in determining the present value of lease payments. We give consideration to our recent debt issuances as well as publicly available data for instruments with similar characteristics when calculating our incremental borrowing rates. Our lease term includes options to extend the lease when it is reasonably certain that we will exercise that option. Leases with a term of 12 months or less are not recorded on the balance sheet. Our lease agreements do not contain any residual value guarantees. Under certain of our capacity purchase agreements with third-party regional carriers, we do not own the underlying aircraft. However, since we control the marketing, scheduling, ticketing, pricing and seat inventories of these aircraft and therefore control the asset, the aircraft is deemed to be leased for accounting purposes. For these capacity purchase agreements, we account for the lease and non-lease components separately. The lease component consists of the aircraft and the non-lease components consist of services, such as the crew and maintenance. We allocate the consideration in the capacity purchase agreements to the lease and non-lease components using their estimated relative standalone prices. See Note 12(b) for additional information on our capacity purchase agreements . For real estate, we account for the lease and non-lease components as a single lease component. (h) 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. (i) 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 2018 . The carrying value of the goodwill on our consolidated balance sheets was $4.1 billion as of December 31, 2018 and 2017 . (j) 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, 2018 and 2017 (in millions): December 31, 2018 2017 Domestic airport slots $ 365 $ 365 Customer relationships 300 300 Marketing agreements 105 105 Tradenames 35 35 Airport gate leasehold rights 137 137 Accumulated amortization (663 ) (622 ) Total $ 279 $ 320 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 $41 million , $44 million and $76 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. We expect to record annual amortization expense for these intangible assets as follows (in millions): 2019 $ 41 2020 41 2021 41 2022 41 2023 7 2024 and thereafter 108 Total $ 279 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. For both periods as of December 31, 2018 and 2017 , we had $1.9 billion of indefinite-lived intangible assets on our consolidated balance sheets. In the second quarter of 2018, we recorded a $26 million impairment charge on a Brazil route authority as a result of the U.S.-Brazil open skies agreement, which is included within special items, net on our consolidated statement of operations. 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 were no additional indefinite-lived intangible asset impairments in 2018 other than the Brazil route authority described above. (k) Revenue Recognition Revenue Effective January 1, 2018, we adopted the New Revenue Standard using the full retrospective method, which resulted in the recast of prior reporting periods. Refer to “ Recent Accounting Pronouncements” in Note 1(b) for the effects of the adoption on our consolidated statements of operations for the years ended December 31, 2017 and 2016 and on our consolidated balance sheet as of December 31, 2017 . Under the New Revenue Standard, revenue is recognized upon the transfer of control of promised products or services to our customers in an amount that reflects the consideration we expect to receive in exchange for those products or services . The following are the significant categories comprising our reported operating revenues (in millions): 2018 2017 2016 Passenger revenue: Passenger travel $ 37,457 $ 36,152 $ 34,278 Loyalty revenue - travel (1) 3,219 2,979 2,767 Total passenger revenue 40,676 39,131 37,045 Cargo 1,013 890 785 Other: Loyalty revenue - marketing services 2,352 2,124 1,872 Other revenue 500 477 440 Total other revenue 2,852 2,601 2,312 Total operating revenues $ 44,541 $ 42,622 $ 40,142 (1) Loyalty revenue included in passenger revenue is principally comprised of mileage credit redemptions earned through travel and mileage credits sold to co-branded credit card and other partners. See “ Loyalty Revenue ” below for further discussion on these mileage credits. The following is our total passenger revenue by geographic region (in millions): 2018 2017 2016 Domestic $ 29,573 $ 28,749 $ 27,202 Latin America 5,125 4,840 4,676 Atlantic 4,376 4,028 3,873 Pacific 1,602 1,514 1,294 Total passenger revenue $ 40,676 $ 39,131 $ 37,045 We attribute passenger revenue by geographic region based upon the origin and destination of each flight segment. Passenger Revenue We recognize all revenues generated from transportation on American and our regional flights operated under the brand name American Eagle, including associated baggage fees, ticketing change fees and other inflight services, as passenger revenue when transportation is provided. Ticket and other related sales for transportation that has not yet been provided are initially deferred and recorded as air traffic liability on our consolidated balance sheets. The air traffic liability principally represents tickets sold for future travel on American and partner airlines, as well as estimated future refunds and exchanges of tickets sold for past travel. 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 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. 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. Loyalty Revenue 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 and other participating partner airlines, as well as other non-air travel awards such as hotels and rental cars. For mileage credits earned by AAdvantage loyalty program members, we apply the deferred revenue method in accordance with the New Revenue Standard. Mileage credits earned through travel For mileage credits earned through travel, we apply a relative selling price approach whereby the total amount collected from each passenger ticket sale is allocated between the air transportation and the mileage credits earned. The portion of each passenger ticket sale attributable to mileage credits earned is initially deferred and then recognized in passenger revenue when mileage credits are redeemed and transportation is provided. The estimated selling price of mileage credits is determined using an equivalent ticket value approach, which uses historical data, including award redemption patterns by geographic region and class of service, as well as similar fares as those used to settle award redemptions. The estimated selling price of miles is adjusted for an estimate of miles that will not be redeemed based on historical redemption patterns. Mileage credits sold to co-branded credit cards and other partners We sell mileage credits to participating airline partners and non-airline business partners including our co-branded credit card partners, under contracts with terms extending generally for one to nine years. Consideration received from the sale of mileage credits is variable and payment terms typically are within 30 days subsequent to the month of mileage sale. Sales of mileage credits to non-airline business partners are comprised of two components, transportation and marketing. We allocate the consideration received from these sales of mileage credits based on the relative selling price of each product or service delivered. Our most significant partner agreements are our co-branded credit card 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 intellectual property, including the American brand and access to loyalty program member lists, which is the predominant element in the agreements, as well as advertising (collectively, the marketing component). Accordingly, we recognize the marketing component in other revenue in the period of the mileage sale following the sales-based royalty method. The transportation component represents the estimated selling price of future travel awards and is determined using the same equivalent ticket value approach described above. The portion of each mileage credit sold attributable to transportation is initially deferred and then recognized in passenger revenue when mileage credits are redeemed and transportation is provided. For the portion of our outstanding mileage credits that we estimate will not be redeemed, we recognize the associated value proportionally as the remaining mileage credits are redeemed. Our estimates are based on analysis of historical redemptions. Cargo Revenue Cargo revenue is recognized when we provide the transportation. Other Revenue Other revenue includes revenue associated with our loyalty program, which is comprised principally of the marketing component of mileage sales to co-branded credit card and other partners and other marketing related payments. For the years ended December 31, 2018 , 2017 and 2016 , loyalty revenue included in other revenue was $2.4 billion , $2.1 billion and $1.9 billion , respectively. The accounting and recognition for the loyalty program marketing services are discussed above in “ Loyalty Revenue .” The remaining amounts included within other revenue relate to airport clubs, advertising and vacation-related services. Contract Balances Our significant contract liabilities are comprised of (1) outstanding loyalty program mileage credits that may be redeemed for future travel and other non-air travel awards, reported as loyalty program liability on our consolidated balance sheet and (2) ticket sales for transportation that has not yet been provided, reported as air traffic liability on our consolidated balance sheet. December 31, 2018 December 31, 2017 (in millions) Loyalty program liability $ 8,539 $ 8,822 Air traffic liability 4,339 4,042 Total $ 12,878 $ 12,864 The balance of the loyalty program liability fluctuates based on seasonal patterns, which impact the volume of mileage credits issued through travel or sold to co-branded credit card and other partners (deferral of revenue) and mileage credits redeemed (recognition of revenue). Changes in loyalty program liability are as follows (in millions): Balance at December 31, 2017 $ 8,822 Deferral of revenue 3,083 Recognition of revenue (1) (3,366 ) Balance at December 31, 2018 (2) $ 8,539 (1) Principally relates to revenue recognized from the redemption of mileage credits for both air and non-air travel awards. Mileage credits are combined in one homogenous pool and are not separately identifiable. As such, the revenue is comprised of miles that were part of the loyalty program deferred revenue balance at the beginning of the period, as well as miles that were issued during the period. (2) Mileage credits can be redeemed at any time and do not expire as long as that AAdvantage member has any type of qualifying activity at least every 18 months . As of December 31, 2018 , our current loyalty program liability was $3.3 billion and represents our current estimate of revenue expected to be recognized in the next twelve months based on historical trends, with the balance reflected in long-term loyalty program liability expected to be recognized as revenue in periods thereafter. The air traffic liability principally represents tickets sold for future travel on American and partner airlines, as well as estimated future refunds and exchanges of tickets sold for past travel. The balance in our air traffic liability also fluctuates with seasonal travel patterns. The contract duration of passenger tickets is one year . Accordingly, any revenue associated with tickets sold for future travel will be recognized within twelve months. For 2018 , $3.1 billion of revenue was recognized in passenger revenue that was included in our air traffic liability at December 31, 2017 . With respect to contract receivables,
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. 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, as well as pension and retiree medical and other postretirement benefits. (b) Recent Accounting Pronouncements Standards Adopted in 2018 Effective January 1, 2018, American adopted the accounting pronouncements described below. 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 adopted the New Revenue Standard using the full retrospective method, which resulted in the recast of prior reporting periods. The adoption of the New Revenue Standard impacted American’s accounting for outstanding mileage credits earned through travel by AAdvantage loyalty program members. There was no change in accounting for sales of mileage credits to co-branded credit card or other partners. Prior to the adoption of the New Revenue Standard, 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. The New Revenue Standard required 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 also required 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 required a gross presentation on the face of American’s consolidated statements of operations for certain revenues and expenses that had previously been presented on a net basis. See “Impacts to 2017 Results” and “Impacts to 2016 Results” below for the impact to American’s consolidated statements of operations data for 2017 and 2016, respectively, and American’s consolidated balance sheet as of December 31, 2017 related to the adoption of the New Revenue Standard. 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 required 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 was applied retrospectively, which resulted in the recast of each prior reporting period presented. The adoption of the New Retirement Standard had no impact on pre-tax income or net income reported. See “ Impacts to 2017 Results ” and “ Impacts to 2016 Results ” below for the impact to American’s consolidated statements of operations data for 2017 and 2016, respectively, related to the adoption of the New Retirement Standard. 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 (ROU) asset on the balance sheet for operating leases. Accounting for finance leases is substantially unchanged. 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. In the fourth quarter of 2018, American elected to early adopt the New Lease Standard as of January 1, 2018 using a modified retrospective transition, with the cumulative-effect adjustment to the opening balance of retained earnings as of the effective date (the effective date method). Under the effective date method, financial results reported in periods prior to 2018 are unchanged. American also elected the package of practical expedients, which among other things, does not require reassessment of lease classification. The adoption of the New Lease Standard had a significant impact on American’s consolidated balance sheet due to the recognition of approximately $10 billion of lease liabilities with corresponding right-of-use assets for operating leases. Additionally, American recognized a $197 million cumulative effect adjustment credit, net of tax, to retained earnings. The adjustment to retained earnings was driven principally by sale-leaseback transactions including the recognition of unamortized deferred aircraft sale-leaseback gains. Prior to the adoption of the New Lease Standard, gains on sale-leaseback transactions were generally deferred and recognized in the income statement over the lease term. Under the New Lease Standard, gains on sale-leaseback transactions (subject to adjustment for off-market terms) are recognized immediately. ASU 2016-01: Financial Instruments - Overall (Subtopic 825-10) This ASU made several modifications to Subtopic 825-10, including the elimination of the available-for-sale classification of equity investments, and it required equity investments with readily determinable fair values to be measured at fair value with changes in fair value recognized in net income. This standard was adopted prospectively as of January 1, 2018 and resulted in a $60 million cumulative effect adjustment credit to retained earnings, net of tax, related to American's investment in China Southern Airlines Company Limited (China Southern Airlines), which was previously accounted for under the cost method. ASU 2016-18: Statement of Cash Flows (Topic 230): Restricted Cash This ASU required that the change in the total cash balance, cash at the beginning of the period and cash at the end of the period on the statement of cash flows include restricted cash, and also required companies that report cash and restricted cash separately on the balance sheet to reconcile those amounts to the statement of cash flows. This standard was applied retrospectively, which resulted in the recast of prior reporting periods in the statement of cash flows. For the years ended December 31, 2018 , 2017 and 2016 , $11 million , $103 million and $113 million , respectively, of restricted cash is included in the total cash and restricted cash balance at the end of the period. A reconciliation of cash and restricted cash reported on American's consolidated statements of cash flows to the amounts reported on its consolidated balance sheets is provided in a table below the Consolidated Statements of Cash Flows. Impacts to 2017 Results The effects of the adoption of the New Revenue Standard and New Retirement Standard to American’s consolidated statement of operations for the twelve months ended December 31, 2017 were as follows (in millions): New Revenue Standard New Retirement Standard Year Ended As Reported Deferred Revenue Method Ancillary Revenue Reclassifications Gross Versus Net Presentation Reclassifications As Recast Operating revenues: Passenger $ 36,133 $ 311 $ 2,648 $ 39 $ — $ 39,131 Cargo 800 — 42 48 — 890 Other 5,262 — (2,690 ) 17 — 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 a $924 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 effects of the adoption of the New Revenue Standard to American’s December 31, 2017 consolidated balance sheet were as follows (in millions): 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 2,791 330 3,121 Noncurrent loyalty program liability — 5,701 5,701 Total stockholders’ equity (deficit) 14,594 (4,706 ) 9,888 Impacts to 2016 Results The effects of the adoption of the New Revenue Standard and New Retirement Standard to American’s consolidated statement of operations for the twelve months ended December 31, 2016 were as follows (in millions): New Revenue Standard New Retirement Standard Year Ended As Reported Deferred Revenue Method Ancillary Revenue Reclassifications Gross Versus Net Presentation Reclassifications As Recast Operating revenues: Passenger $ 34,579 $ (147 ) $ 2,571 $ 42 $ — $ 37,045 Cargo 700 — 36 49 — 785 Other 4,884 — (2,607 ) 18 — 2,295 Total operating revenues 40,163 (147 ) — 109 — 40,125 Total operating expenses 34,859 — — 109 77 35,045 Operating income 5,304 (147 ) — — (77 ) 5,080 Total nonoperating expense, net (861 ) — — — 77 (784 ) Income before income taxes 4,443 (147 ) — — — 4,296 Income tax provision 1,662 (55 ) — — — 1,607 Net income $ 2,781 $ (92 ) $ — $ — $ — $ 2,689 Standards Effective for 2019 Reporting Periods ASU 2018-02: Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income This ASU provides financial statement preparers with an option to reclassify stranded tax effects within accumulated other comprehensive income to retained earnings due to the U.S. federal corporate income tax rate change as a result of the 2017 Tax Act. The amount of the reclassification is the difference between the amount initially charged or credited directly to other comprehensive income at the previously enacted U.S. federal corporate income tax rate that remains in accumulated other comprehensive income and the amount that would have been charged or credited directly to other comprehensive income using the newly enacted U.S. federal corporate income tax rate, excluding the effect of any valuation allowance previously charged to income from continuing operations. This standard is effective for interim and annual reporting periods beginning after December 15, 2018, and early adoption is permitted. American will adopt this standard effective January 1, 2019. The adoption of the standard may impact tax amounts stranded in accumulated other comprehensive income related to American's pension and retiree medical and other postretirement benefit plans. (c) 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 American’s consolidated statements of operations. Unrealized gains and losses are recorded in accumulated other comprehensive loss on American’s consolidated balance sheets. (d) Restricted Cash and Short-term Investments American has restricted cash and short-term investments related primarily to collateral held to support workers’ compensation obligations. (e) 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. (f) 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 $2.4 billion , $2.1 billion and $1.8 billion for the years ended December 31, 2018 , 2017 and 2016 , respectively. (g) Leases American determines if an arrangement is a lease at inception. Operating leases are included in operating lease ROU assets, current operating lease liabilities and noncurrent operating lease liabilities in American’s consolidated balance sheet. Finance leases are included in property and equipment, current maturities of long-term debt and finance leases and long-term debt and finance leases, net of current maturities, in American’s consolidated balance sheet. ROU assets represent American’s right to use an underlying asset for the lease term and lease liabilities represent its obligation to make lease payments arising from the lease. ROU assets and liabilities are recognized at the lease commencement date based on the estimated present value of lease payments over the lease term. American uses its estimated incremental borrowing rate, which is derived from information available at the lease commencement date , in determining the present value of lease payments. American gives consideration to its recent debt issuances as well as publicly available data for instruments with similar characteristics when calculating its incremental borrowing rates. American’s lease term includes options to extend the lease when it is reasonably certain that it will exercise that option. Leases with a term of 12 months or less are not recorded on the balance sheet. American’s lease agreements do not contain any residual value guarantees. Under certain of American’s capacity purchase agreements with third-party regional carriers, American does not own the underlying aircraft. However, since American controls the marketing, scheduling, ticketing, pricing and seat inventories of these aircraft and therefore control the asset, the aircraft is deemed to be leased for accounting purposes. For these capacity purchase agreements, American accounts for the lease and non-lease components separately. The lease component consists of the aircraft and the non-lease components consist of services, such as the crew and maintenance. American allocates the consideration in the capacity purchase agreements to the lease and non-lease components using their estimated relative standalone prices. See Note 10(b) for additional information on its capacity purchase agreements . For real estate, American accounts for the lease and non-lease components as a single lease component. (h) 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. (i) 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 2018 . The carrying value of the goodwill on American’s consolidated balance sheets was $4.1 billion as of December 31, 2018 and 2017 . (j) 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, 2018 and 2017 (in millions): December 31, 2018 2017 Domestic airport slots $ 365 $ 365 Customer relationships 300 300 Marketing agreements 105 105 Tradenames 35 35 Airport gate leasehold rights 137 137 Accumulated amortization (663 ) (622 ) Total $ 279 $ 320 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 $41 million , $44 million and $76 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. American expects to record annual amortization expense for these intangible assets as follows (in millions): 2019 $ 41 2020 41 2021 41 2022 41 2023 7 2024 and thereafter 108 Total $ 279 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. For both periods as of December 31, 2018 and 2017 , American had $1.9 billion of indefinite-lived intangible assets on its consolidated balance sheets. In the second quarter of 2018, American recorded a $26 million impairment charge on a Brazil route authority as a result of the U.S.-Brazil open skies agreement, which is included within special items, net on its consolidated statement of operations. 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 were no additional indefinite-lived intangible asset impairments in 2018 other than the Brazil route authority described above. (k) Revenue Recognition Revenue Effective January 1, 2018, American adopted the New Revenue Standard using the full retrospective method, which resulted in the recast of prior reporting periods. Refer to “ Recent Accounting Pronouncements” in Note 1(b) for the effects of the adoption on American’s consolidated statements of operations for the years ended December 31, 2017 and 2016 and on American’s consolidated balance sheet as of December 31, 2017 . Under the New Revenue Standard, revenue is recognized upon the transfer of control of promised products or services to American’s customers in an amount that reflects the consideration it expects to receive in exchange for those products or services . The following are the significant categories comprising American’s reported operating revenues (in millions): 2018 2017 2016 Passenger revenue: Passenger travel $ 37,457 $ 36,152 $ 34,278 Loyalty revenue - travel (1) 3,219 2,979 2,767 Total passenger revenue 40,676 39,131 37,045 Cargo 1,013 890 785 Other: Loyalty revenue - marketing services 2,352 2,124 1,872 Other revenue 489 465 423 Total other revenue 2,841 2,589 2,295 Total operating revenues $ 44,530 $ 42,610 $ 40,125 (1) Loyalty revenue included in passenger revenue is principally comprised of mileage credit redemptions earned through travel and mileage credits sold to co-branded credit card and other partners. See “ Loyalty Revenue” below for further discussion on these mileage credits. The following is American’s total passenger revenue by geographic region (in millions): 2018 2017 2016 Domestic $ 29,573 $ 28,749 $ 27,202 Latin America 5,125 4,840 4,676 Atlantic 4,376 4,028 3,873 Pacific 1,602 1,514 1,294 Total passenger revenue $ 40,676 $ 39,131 $ 37,045 American attributes passenger revenue by geographic region based upon the origin and destination of each flight segment. Passenger Revenue American recognizes all revenues generated from transportation on American and its regional flights operated under the brand name American Eagle, including associated baggage fees, ticketing change fees and other inflight services, as passenger revenue when transportation is provided. Ticket and other related sales for transportation that has not yet been provided are initially deferred and recorded as air traffic liability on American’s consolidated balance sheets. The air traffic liability principally represents tickets sold for future travel on American and partner airlines, as well as estimated future refunds and exchanges of tickets sold for past travel. 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 has 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. 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. Loyalty Revenue 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 and other participating partner airlines, as well as other non-air travel awards such as hotels and rental cars. For mileage credits earned by AAdvantage loyalty program members, American applies the deferred revenue method in accordance with the New Revenue Standard. Mileage credits earned through travel For mileage credits earned through travel, American applies a relative selling price approach whereby the total amount collected from each passenger ticket sale is allocated between the air transportation and the mileage credits earned. The portion of each passenger ticket sale attributable to mileage credits earned is initially deferred and then recognized in passenger revenue when mileage credits are redeemed and transportation is provided. The estimated selling price of mileage credits is determined using an equivalent ticket value approach, which uses historical data, including award redemption patterns by geographic region and class of service, as well as similar fares as those used to settle award redemptions. The estimated selling price of miles is adjusted for an estimate of miles that will not be redeemed based on historical redemption patterns. Mileage credits sold to co-branded credit cards and other partners American sells mileage credits to participating airline partners and non-airline business partners including American’s co-branded credit card partners, under contracts with terms extending generally for one to nine years . Consideration received from the sale of mileage credits is variable and payment terms typically are within 30 days subsequent to the month of mileage sale. Sales of mileage credits to non-airline business partners are comprised of two components, transportation and marketing. American allocates the consideration received from these sales of mileage credits based on the relative selling price of each product or service delivered. American’s most significant partner agreements are its co-branded credit card agreements with Citi and Barclaycard US that American entered into in 2016. American identified the following revenue elements in these co-branded credit card agreements: the transportation component; and the use of intellectual property, including the American brand and access to loyalty program member lists, which is the predominant element in the agreements, as well as advertising (collectively, the marketing component). Accordingly, American recognizes the marketing component in other revenue in the period of the mileage sale following the sales-based royalty method. The transportation component represents the estimated selling price of future travel awards and is determined using the same equivalent ticket value approach described above. The portion of each mileage credit sold attributable to transportation is initially deferred and then recognized in passenger revenue when mileage credits are redeemed and transportation is provided. For the portion of American’s outstanding mileage credits that it estimates will not be redeemed, American recognizes the associated value proportionally as the remaining mileage credits are redeemed. American’s estimates are based on analysis of historical redemptions. Cargo Revenue Cargo revenue is recognized when American provides the transportation. Other Revenue Other revenue includes revenue associated with American’s loyalty program, which is comprised principally of the marketing component of mileage sales to co-branded credit card and other partners and other marketing related payments. For the years ended December 31, 2018 , 2017 and 2016 , loyalty revenue included in other revenue was $2.4 billion , $2.1 billion and $1.9 billion , respectively. The accounting and recognition for the loyalty program marketing services are discussed above in “ Loyalty Revenue .” The remaining amounts included within other revenue relate to airport clubs, advertising and vacation-related services. Contract Balances American’s significant contract liabilities are comprised of (1) outstanding loyalty program mileage credits that may be redeemed for future travel and other non-air travel awards, reported as loyalty program liability on American’s consolidated balance sheet and (2) ticket sales for transportation that has not yet been provided, reported as air traffic liability on American’s consolidated balance sheet. December 31, 2018 December 31, 2017 (in millions) Loyalty program liability $ 8,539 $ 8,822 Air traffic liability 4,339 4,042 Total $ 12,878 $ 12,864 The balance of the loyalty program liability fluctuates based on seasonal patterns, which impact the volume of mileage credits issued through travel or sold to co-branded credit card and other partners (deferral of revenue) and mileage credits redeemed (recognition of revenue). Changes in loyalty program liability are as follows (in millions): Balance at December 31, 2017 $ 8,822 Deferral of revenue 3,083 Recognition of revenue (1) (3,366 ) Balance at December 31, 2018 (2) $ 8,539 (1) Principally relates to revenue recognized from the redemption of mileage credits for both air and non-air travel awards. Mileage credits are combined in one homogenous pool and are not separately identifiable. As such, the revenue is comprised of miles that were part of the loyalty program deferred revenue balance at the beginning of the period, as well as miles that were issued during the period. (2) Mileage credits can be redeemed at any time and do not expire as long as that AAdvantage member has any type of qualifying activity at least every 18 months . As of December 31, 2018 , American’s current loyalty program liability was $3.3 billion and represents American’s current estimate of revenue expected to be recognized in the next twelve months based on historical trends, with the balance reflected in long-term loyalty program liability expected to be recognized as revenue in periods thereafter. The air traffic liability principally represents tickets sold for future travel on American and partner airlines, as well as estimated future refunds and exchanges of tickets sold for past travel. The balance in American’s air traffic liability also fluctuates with seasonal travel patterns. The contract duration of passenger tickets

Special Items, Net

Special Items, Net	12 Months Ended
	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Special Items, Net	Special Items, Net Special items, net on our consolidated statements of operations consisted of the following (in millions): Year Ended December 31, 2018 2017 2016 Fleet restructuring expenses (1) $ 422 $ 232 $ 177 Merger integration expenses (2) 268 273 514 Severance expenses (3) 58 — — Litigation settlement (4) 45 — — Intangible asset impairment (5) 26 — — Labor contract expenses 13 46 — Mark-to-market adjustments on bankruptcy obligations, net (6) (76 ) 27 25 Employee 2017 Tax Act bonus expense (7) — 123 — Other operating charges (credits), net 31 11 (7 ) Mainline operating special items, net 787 712 709 Regional operating special items, net 6 22 14 Operating special items, net 793 734 723 Mark-to-market adjustments on equity investments, net (8) 104 — — Debt refinancing and extinguishment charges 13 22 49 Other nonoperating credits, net (4 ) — — Nonoperating special items, net 113 22 49 Income tax special items (9) 18 — — Impact of the 2017 Tax Act (10) — 823 — Income tax special items, net 18 823 — (1) Fleet restructuring expenses principally included accelerated depreciation and rent expense for aircraft and related equipment grounded or expected to be grounded earlier than planned. (2) Merger integration expenses included costs associated with integration projects, principally our flight attendant, human resources and payroll, and technical operations systems. (3) Severance expenses primarily included costs associated with reductions of management and support staff team members. (4) Settlement of a private party antitrust lawsuit. See Note 12(e) - “ Private Party Antitrust Action Related to Passenger Capacity ” for further discussion. (5) Intangible asset impairment includes a non-cash charge to write-off our Brazil route authority as a result of the U.S.-Brazil open skies agreement. (6) Bankruptcy obligations that will be settled in shares of our common stock are marked-to-market based on our stock price. (7) 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. (8) Mark-to-market adjustments on equity investments relate to net unrealized losses primarily associated with our equity investments in China Southern Airlines and Mesa Air Group, Inc. (9) Income tax special items for 2018 included an $18 million charge related to an international income tax matter. (10) Impact of the 2017 Tax Act includes an $823 million non-cash charge to income tax expense to reflect the impact of lower corporate income tax rates on our deferred tax asset and liabilities resulting from the 2017 Tax Act, which reduced the federal corporate income tax rate from 35% to 21%.
American Airlines, Inc. [Member]
Restructuring Cost and Reserve [Line Items]
Special Items, Net	Special Items, Net Special items, net on American’s consolidated statements of operations consisted of the following (in millions): Year Ended December 31, 2018 2017 2016 Fleet restructuring expenses (1) $ 422 $ 232 $ 177 Merger integration expenses (2) 268 273 514 Severance expenses (3) 58 — — Litigation settlement (4) 45 — — Intangible asset impairment (5) 26 — — Labor contract expenses 13 46 — Mark-to-market adjustments on bankruptcy obligations, net (6) (76 ) 27 25 Employee 2017 Tax Act bonus expense (7) — 123 — Other operating charges (credits), net 31 11 (7 ) Mainline operating special items, net 787 712 709 Regional operating special items, net — 3 13 Operating special items, net 787 715 722 Mark-to-market adjustments on equity investments, net (8) 104 — — Debt refinancing and extinguishment charges 13 22 49 Other nonoperating credits, net (4 ) — — Nonoperating special items, net 113 22 49 Income tax special items (9) 18 — — Impact of the 2017 Tax Act (10) — 924 — Income tax special items, net 18 924 — (1) Fleet restructuring expenses principally included accelerated depreciation and rent expense for aircraft and related equipment grounded or expected to be grounded earlier than planned. (2) Merger integration expenses included costs associated with integration projects, principally American's flight attendant, human resources and payroll, and technical operations systems. (3) Severance expenses primarily included costs associated with reductions of management and support staff team members. (4) Settlement of a private party antitrust lawsuit. See Note 10(e) - “ Private Party Antitrust Action Related to Passenger Capacity ” for further discussion. (5) Intangible asset impairment includes a non-cash charge to write-off American’s Brazil route authority as a result of the U.S.-Brazil open skies agreement. (6) Bankruptcy obligations that will be settled in shares of AAG common stock are marked-to-market based on AAG’s stock price. (7) 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. (8) Mark-to-market adjustments on equity investments relate to net unrealized losses primarily associated with American’s equity investments in China Southern Airlines and Mesa Air Group, Inc. (9) Income tax special items for 2018 included an $18 million charge related to an international income tax matter. (10) Impact of the 2017 Tax Act includes a $924 million non-cash charge to income tax expense to reflect the impact of lower corporate income tax rates on the Company’s deferred tax asset and liabilities resulting from the 2017 Tax Act, which reduced the federal corporate income tax rate from 35% to 21%.

Earnings Per Common Share

Earnings Per Common Share	12 Months Ended
	Dec. 31, 2018
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, 2018 2017 2016 Basic EPS: Net income $ 1,412 $ 1,282 $ 2,584 Weighted average common shares outstanding (in thousands) 464,236 489,164 552,308 Basic EPS $ 3.04 $ 2.62 $ 4.68 Diluted EPS: Net income for purposes of computing diluted EPS $ 1,412 $ 1,282 $ 2,584 Share computation for diluted EPS (in thousands): Basic weighted average common shares outstanding 464,236 489,164 552,308 Dilutive effect of stock awards 1,424 2,528 3,791 Diluted weighted average common shares outstanding 465,660 491,692 556,099 Diluted EPS $ 3.03 $ 2.61 $ 4.65 Restricted stock unit awards excluded from the calculation of diluted EPS because inclusion would be antidilutive (in thousands) 1,266 328 1,429

Share Repurchase Programs and D

Share Repurchase Programs and Dividends	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Share Repurchase Programs and Dividends	Share Repurchase Programs and Dividends In April 2018, we announced that our Board of Directors authorized a new $2.0 billion share repurchase program that expires on December 31, 2020. Since July 2014, our Board of Directors has approved seven share repurchase programs aggregating $13.0 billion of authority. As of December 31, 2018 , there was $1.7 billion remaining authority to repurchase shares under our new $2.0 billion share repurchase program. 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 that may be made from time to time will be 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 AAG common stock may be limited, suspended or discontinued at any time at our discretion and without prior notice. In 2018 , we repurchased 16.6 million shares of AAG common stock for $800 million at a weighted average cost per share of $48.15 . In 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 . In 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 . Since the inception of our share repurchase programs in July 2014 through December 31, 2018, we have repurchased 278.9 million shares of AAG common stock for $11.3 billion at a weighted average cost per share of $40.69 . Our Board of Directors declared quarterly cash dividends of $0.10 per share totaling $186 million , $198 million and $224 million for 2018 , 2017 and 2016 , respectively.

Debt

Debt	12 Months Ended
	Dec. 31, 2018
Debt Instrument [Line Items]
Debt	Debt Long-term debt included in the consolidated balance sheets consisted of (in millions): December 31, 2018 2017 Secured 2013 Credit Facilities, variable interest rate of 4.26%, installments through 2025 (a) $ 1,825 $ 1,825 2014 Credit Facilities, variable interest rate of 4.39%, installments through 2021 (a) 1,215 728 April 2016 Credit Facilities, variable interest rate of 4.52%, installments through 2023 (a) 980 990 December 2016 Credit Facilities, variable interest rate of 4.46%, installments through 2023 (a) 1,225 1,238 Aircraft enhanced equipment trust certificates (EETCs), fixed interest rates ranging from 3.00% to 9.01%, averaging 4.21%, maturing from 2019 to 2029 (b) 11,648 11,881 Equipment loans and other notes payable, fixed and variable interest rates ranging from 2.34% to 8.48%, averaging 4.26%, maturing from 2019 to 2030 (c) 5,060 5,259 Special facility revenue bonds, fixed interest rates ranging from 5.00% to 8.00%, maturing from 2019 to 2031 798 857 Other secured obligations — 2 22,751 22,780 Unsecured 5.50% senior notes, interest only payments until due in 2019 (d) 750 750 4.625% senior notes, interest only payments until due in 2020 (d) 500 500 6.125% senior notes — 500 1,250 1,750 Total long-term debt 24,001 24,530 Less: Total unamortized debt discount, premium and issuance costs 222 236 Less: Current maturities 3,213 2,476 Long-term debt, net of current maturities $ 20,566 $ 21,818 The table below shows the maximum availability under revolving credit facilities, all of which were undrawn, as of December 31, 2018 (in millions): 2013 Revolving Facility $ 1,000 2014 Revolving Facility 1,543 April 2016 Revolving Facility 300 Total $ 2,843 Secured financings are collateralized by assets, primarily aircraft, engines, simulators, aircraft spare parts, airport gate leasehold rights, route authorities, airport slots and pre-delivery payments. At December 31, 2018 , the maturities of long-term debt are as follows (in millions): 2019 $ 3,258 2020 2,320 2021 3,411 2022 1,346 2023 3,894 2024 and thereafter 9,772 Total $ 24,001 (a) 2013, 2014, April 2016 and December 2016 Credit Facilities 2013 Credit Facilities In May 2018, American and AAG entered into a Fourth Amendment (the Fourth Amendment to the 2013 Credit Agreement) 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, the 2013 Credit Agreement, the revolving facility established thereunder, the 2013 Revolving Facility, the term loan facility established thereunder, the 2013 Term Loan Facility, and the 2013 Revolving Facility together with the 2013 Term Loan Facility, the 2013 Credit Facilities), pursuant to which American refinanced $1.8 billion of the existing term loans outstanding under the 2013 Credit Facilities with proceeds of term loans incurred under the Fourth Amendment to the 2013 Credit Agreement (the 2013 Replacement Term Loans). The LIBOR margin on the 2013 Replacement Term Loans was reduced from 2.00% to 1.75% and the base rate margin on the 2013 Replacement Term Loans was reduced from 1.00% to 0.75% . Additionally, the maturity date of the 2013 Replacement Term Loans was extended to June 2025 pursuant to the Fourth Amendment to the 2013 Credit Agreement . In December 2018, American and AAG entered into a Fifth Amendment (the Fifth Amendment to the 2013 Credit Agreement) to the 2013 Credit Agreement, as previously amended by the Fourth Amendment to the 2013 Credit Agreement. Pursuant to the Fifth Amendment to the 2013 Credit Agreement, adjustments to the 2013 Revolving Facility were made, including reducing the total aggregate commitments under the 2013 Revolving Facility by $200 million , extending the maturity date for the revolver loans thereunder from October 2022 to October 2023 and reducing the LIBOR margin from 2.25% to 2.00% and the base rate margin from 1.25% to 1.00% for certain of the lenders of the revolver loans thereunder. As of December 31, 2018 , there were no borrowings or letters of credit outstanding under the 2013 Revolving Facility. 2014 Credit Facilities In September 2018, American and AAG entered into a Fifth Amendment (the Fifth Amendment to the 2014 Credit Agreement) 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, the 2014 Credit Agreement, the revolving credit facility established thereunder, the 2014 Revolving Facility, the term loan facility established thereunder, the 2014 Term Loan Facility, and the 2014 Revolving Facility together with the 2014 Term Loan Facility, the 2014 Credit Facilities). The Fifth Amendment to the 2014 Credit Agreement provides for incremental term loans in the amount of $500 million under the 2014 Term Loan Facility. The terms of such incremental term loans are substantially similar to the terms of the existing term loans under the 2014 Term Loan Facility, including those with regard to maturity and interest rate margins. As of December 31, 2018 , approximately $1.2 billion was outstanding under the 2014 Term Loan Facility. In December 2018, American and AAG entered into a Sixth Amendment (the Sixth Amendment to the 2014 Credit Agreement) to the 2014 Credit Agreement, as previously amended by the Fifth Amendment to the 2014 Credit Agreement. Pursuant to the Sixth Amendment to the 2014 Credit Agreement , adjustments to the 2014 Revolving Facility were made, including increasing the total aggregate commitments under the 2014 Revolving Facility by approximately $543 million , extending the maturity date for the revolver loans thereunder from October 2022 to October 2023 and reducing the LIBOR margin from 2.25% to 2.00% and the base rate margin from 1.25% to 1.00% for certain of the lenders of the revolver loans thereunder. In addition to the slots, gates and routes (SGR) between airports in the United States and LHR previously pledged as collateral for the 2014 Credit Facilities, SGR between airports in the United States and other countries in the European Union were added as collateral under the 2014 Credit Facilities pursuant to the Sixth Amendment to the 2014 Credit Agreement. As of December 31, 2018 , there were no borrowings or letters of credit outstanding under the 2014 Revolving Facility . April 2016 Credit Facilities In December 2018, American and AAG entered into a Fourth Amendment (the Fourth Amendment to the April 2016 Credit Agreement) to the Credit and Guaranty Agreement, amending the Credit and Guaranty Agreement dated as of April 29, 2016 (as previously amended, the April 2016 Credit Agreement , and the revolving credit facility established thereunder, the April 2016 Revolving Facility, the term loan facility established thereunder, the 2016 Term Loan Facility and the 2016 April Revolving Facility together with the 2016 Term Loan Facility, the April 2016 Credit Facilities). Pursuant to the Fourth Amendment to the April 2016 Credit Agreement, adjustments to the April 2016 Revolving Facility were made, including extending the maturity date from October 2022 to October 2023 for the revolver loans established thereunder and reducing the LIBOR margin from 2.25% to 2.00% and the base rate margin from 1.25% to 1.00% for certain of the lenders of the revolver loans thereunder. As of December 31, 2018 , there were no borrowings or letters of credit outstanding under the April 2016 Revolving Facility. 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 American refinanced the $1.3 billion term loan facility due December 2023 established thereunder (the December 2016 Term Loan Facility, and together with a revolving credit facility that may be established thereunder in the future, the December 2016 Credit Facilities), 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 Credit Facilities, 2014 Credit Facilities, April 2016 Credit Facilities and December 2016 Credit Facilities (collectively referred to as the Credit Facilities) are shown in the table below as of December 31, 2018 : 2013 Credit Facilities 2014 Credit Facilities April 2016 Credit Facilities December 2016 Credit Facilities 2013 Replacement Term Loan 2013 2014 Term Loan 2014 April 2016 Term Loan April 2016 December 2016 Term Loan Aggregate principal issued or credit facility availability (in millions) $1,900 $1,000 $1,250 $1,543 $1,000 $300 $1,250 Principal outstanding or drawn (in millions) $1,825 $— $1,215 $— $980 $— $1,225 Maturity date June 2025 October 2023 October 2021 October 2023 April 2023 October 2023 December 2023 LIBOR margin 1.75% 2.00% 2.00% 2.00% 2.00% 2.00% 2.00% The term loans under each of the Credit Facilities 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 Revolving Facility, 2014 Revolving Facility and April 2016 Revolving Facility provide that American may from time to time borrow, repay and reborrow loans thereunder. The 2013 Revolving Facility and 2014 Revolving Facility have the ability to issue letters of credit thereunder in an aggregate amount outstanding at any time up to $100 million and $200 million , respectively. The 2013 Revolving Facility, 2014 Revolving Facility and April 2016 Revolving Facility are each subject to an undrawn annual fee of 0.63% . As of December 31, 2018 , there were no borrowings or letters of credit outstanding under the 2013 Revolving Facility, 2014 Revolving Facility or April 2016 Revolving Facility. The December 2016 Credit Facilities provide for a revolving credit facility that may be established thereunder 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 Revolving Facility, 2014 Revolving Facility and April 2016 Revolving Facility and any revolving credit facility 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 Below is a discussion of the 2018 aircraft financing activities resulting from EETC issuances. 2017-2 EETCs In August and October 2017, American created three pass-through trusts which issued approximately $1.0 billion aggregate face amount of Series 2017-2 Class AA, Class A and Class B EETCs (the 2017-2 EETCs) in connection with the financing of 30 aircraft delivered to American through May 2018 (the 2017-2 Aircraft). In 2017, approximately $735 million of the net proceeds were used to purchase equipment notes issued by American in connection with the financing of 24 aircraft financed under the 2017-2 EETC. During the first six months of 2018, the remaining $283 million of net proceeds was used to purchase equipment notes issued by American in connection with the financing of the remaining six aircraft financed under the 2017-2 EETCs. 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 that began in April 2018 and principal payments that began in October 2018. These equipment notes are secured by liens on the 2017-2 Aircraft. Certain information regarding the 2017-2 EETC equipment notes, as of December 31, 2018 , 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 Fixed interest rate per annum 3.35% 3.60% 3.70% Maturity date October 2029 October 2029 October 2025 2012-2C(R) EETCs On May 15, 2018, American created a pass-through trust which issued $100 million aggregate face amount of the Series 2012-2 Class C(R) EETCs (the 2012-2C(R) EETCs). Interest and principal payments on equipment notes issued in connection with the 2012-2C(R) EETCs are payable semi-annually in June and December of each year, which began in December 2018. American had previously issued $100 million aggregate face amount of Series 2012-2 Class C Certificates on June 6, 2013 (the 2012-2C Certificates) in connection with the financing of 11 aircraft previously delivered to American between May 2013 and October 2013. On June 1, 2018, American redeemed the Series C Equipment Notes relating to such 2012-2C Certificates (the 2012-2C Equipment Notes), which were scheduled to mature on June 3, 2018. The proceeds received from the 2012-2C(R) EETCs were used for the redemption of the 2012-2 Series C Equipment Notes and the repayment of the 2012-2C Certificates. Certain information regarding the 2012-2 Class C(R) EETC equipment notes, as of December 31, 2018 , is set forth in the table below. 2012-2C(R) EETCs Series C(R) Aggregate principal issued $100 million Fixed interest rate per annum 4.70% Maturity date June 2021 (c) Equipment Loans and Other Notes Payable Issued in 2018 In 2018 , American entered into agreements under which it borrowed $1.5 billion in connection with the financing of certain aircraft and certain pre-delivery purchase deposits. Debt incurred under these agreements matures in 2021 through 2030 and bears interest at fixed and variable rates of LIBOR plus an applicable margin averaging 4.28% at December 31, 2018 . (d) Senior Notes The details of our 5.50% and 4.625% senior notes are shown in the table below as of December 31, 2018 : 5.50% Senior Notes 4.625% Senior Notes Aggregate principal issued and outstanding $750 million $500 million Maturity date October 2019 March 2020 Fixed interest rate per annum 5.50% 4.625% Interest payments Semi-annually in arrears in April and October Semi-annually in arrears in March and September The 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, 2018 , AAG had issued guarantees covering approximately $769 million of American’s special facility revenue bonds (and interest thereon) and $8.4 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 our 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 34.8% 18.8% 40.9% 57.5% 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 European Union (including 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, 2018 , 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 included in the consolidated balance sheets consisted of (in millions): December 31, 2018 2017 Secured 2013 Credit Facilities, variable interest rate of 4.26%, installments through 2025 (a) $ 1,825 $ 1,825 2014 Credit Facilities, variable interest rate of 4.39%, installments through 2021 (a) 1,215 728 April 2016 Credit Facilities, variable interest rate of 4.52%, installments through 2023 (a) 980 990 December 2016 Credit Facilities, variable interest rate of 4.46%, installments through 2023 (a) 1,225 1,238 Aircraft enhanced equipment trust certificates (EETCs), fixed interest rates ranging from 3.00% to 9.01%, averaging 4.21%, maturing from 2019 to 2029 (b) 11,648 11,881 Equipment loans and other notes payable, fixed and variable interest rates ranging from 2.34% to 8.48%, averaging 4.26%, maturing from 2019 to 2030 (c) 5,060 5,259 Special facility revenue bonds, fixed interest rates of 5.00%, maturing from 2019 to 2031 769 828 Other secured obligations — 1 Total long-term debt 22,722 22,750 Less: Total unamortized debt discount, premium and issuance costs 219 227 Less: Current maturities 2,466 1,980 Long-term debt, net of current maturities $ 20,037 $ 20,543 The table below shows the maximum availability under revolving credit facilities, all of which were undrawn, as of December 31, 2018 (in millions): 2013 Revolving Facility $ 1,000 2014 Revolving Facility 1,543 April 2016 Revolving Facility 300 Total $ 2,843 Secured financings are collateralized by assets, primarily aircraft, engines, simulators, aircraft spare parts, airport gate leasehold rights, route authorities, airport slots and pre-delivery payments. At December 31, 2018 , the maturities of long-term debt are as follows (in millions): 2019 $ 2,508 2020 1,815 2021 3,409 2022 1,344 2023 3,892 2024 and thereafter 9,754 Total $ 22,722 (a) 2013, 2014, April 2016 and December 2016 Credit Facilities 2013 Credit Facilities In May 2018, American and AAG entered into a Fourth Amendment (the Fourth Amendment to the 2013 Credit Agreement) 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, the 2013 Credit Agreement, the revolving facility established thereunder, the 2013 Revolving Facility, the term loan facility established thereunder, the 2013 Term Loan Facility, and the 2013 Revolving Facility together with the 2013 Term Loan Facility, the 2013 Credit Facilities), pursuant to which American refinanced $1.8 billion of the existing term loans outstanding under the 2013 Credit Facilities with proceeds of term loans incurred under the Fourth Amendment to the 2013 Credit Agreement (the 2013 Replacement Term Loans). The LIBOR margin on the 2013 Replacement Term Loans was reduced from 2.00% to 1.75% and the base rate margin on the 2013 Replacement Term Loans was reduced from 1.00% to 0.75% . Additionally, the maturity date of the 2013 Replacement Term Loans was extended to June 2025 pursuant to the Fourth Amendment to the 2013 Credit Agreement . In December 2018, American and AAG entered into a Fifth Amendment (the Fifth Amendment to the 2013 Credit Agreement) to the 2013 Credit Agreement, as previously amended by the Fourth Amendment to the 2013 Credit Agreement. Pursuant to the Fifth Amendment to the 2013 Credit Agreement, adjustments to the 2013 Revolving Facility were made, including reducing the total aggregate commitments under the 2013 Revolving Facility by $200 million , extending the maturity date for the revolver loans thereunder from October 2022 to October 2023 and reducing the LIBOR margin from 2.25% to 2.00% and the base rate margin from 1.25% to 1.00% for certain of the lenders of the revolver loans thereunder. As of December 31, 2018 , there were no borrowings or letters of credit outstanding under the 2013 Revolving Facility. 2014 Credit Facilities In September 2018, American and AAG entered into a Fifth Amendment (the Fifth Amendment to the 2014 Credit Agreement) 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, the 2014 Credit Agreement, the revolving credit facility established thereunder, the 2014 Revolving Facility, the term loan facility established thereunder, the 2014 Term Loan Facility, and the 2014 Revolving Facility together with the 2014 Term Loan Facility, the 2014 Credit Facilities). The Fifth Amendment to the 2014 Credit Agreement provides for incremental term loans in the amount of $500 million under the 2014 Term Loan Facility. The terms of such incremental term loans are substantially similar to the terms of the existing term loans under the 2014 Term Loan Facility, including those with regard to maturity and interest rate margins. As of December 31, 2018 , approximately $1.2 billion was outstanding under the 2014 Term Loan Facility. In December 2018, American and AAG entered into a Sixth Amendment (the Sixth Amendment to the 2014 Credit Agreement) to the 2014 Credit Agreement, as previously amended by the Fifth Amendment to the 2014 Credit Agreement. Pursuant to the Sixth Amendment to the 2014 Credit Agreement , adjustments to the 2014 Revolving Facility were made, including increasing the total aggregate commitments under the 2014 Revolving Facility by approximately $543 million , extending the maturity date for the revolver loans thereunder from October 2022 to October 2023 and reducing the LIBOR margin from 2.25% to 2.00% and the base rate margin from 1.25% to 1.00% for certain of the lenders of the revolver loans thereunder. In addition to the slots, gates and routes (SGR) between airports in the United States and LHR previously pledged as collateral for the 2014 Credit Facilities, SGR between airports in the United States and other countries in the European Union were added as collateral under the 2014 Credit Facilities pursuant to the Sixth Amendment to the 2014 Credit Agreement. As of December 31, 2018 , there were no borrowings or letters of credit outstanding under the 2014 Revolving Facility . April 2016 Credit Facilities In December 2018, American and AAG entered into a Fourth Amendment (the Fourth Amendment to the April 2016 Credit Agreement) to the Credit and Guaranty Agreement, amending the Credit and Guaranty Agreement dated as of April 29, 2016 (as previously amended, the April 2016 Credit Agreement , and the revolving credit facility established thereunder, the April 2016 Revolving Facility, the term loan facility established thereunder, the 2016 Term Loan Facility and the 2016 April Revolving Facility together with the 2016 Term Loan Facility, the April 2016 Credit Facilities). Pursuant to the Fourth Amendment to the April 2016 Credit Agreement, adjustments to the April 2016 Revolving Facility were made, including extending the maturity date from October 2022 to October 2023 for the revolver loans established thereunder and reducing the LIBOR margin from 2.25% to 2.00% and the base rate margin from 1.25% to 1.00% for certain of the lenders of the revolver loans thereunder. As of December 31, 2018 , there were no borrowings or letters of credit outstanding under the April 2016 Revolving Facility. 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 American refinanced the $1.3 billion term loan facility due December 2023 established thereunder (the December 2016 Term Loan Facility, and together with a revolving credit facility that may be established thereunder in the future, the December 2016 Credit Facilities), 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 Credit Facilities, 2014 Credit Facilities, April 2016 Credit Facilities and December 2016 Credit Facilities (collectively referred to as the Credit Facilities) are shown in the table below as of December 31, 2018 : 2013 Credit Facilities 2014 Credit Facilities April 2016 Credit Facilities December 2016 Credit Facilities 2013 Replacement Term Loan 2013 2014 Term 2014 April 2016 April 2016 December 2016 Term Loan Aggregate principal issued or credit facility availability (in millions) $1,900 $1,000 $1,250 $1,543 $1,000 $300 $1,250 Principal outstanding or drawn (in millions) $1,825 $— $1,215 $— $980 $— $1,225 Maturity date June 2025 October 2023 October 2021 October 2023 April 2023 October 2023 December 2023 LIBOR margin 1.75% 2.00% 2.00% 2.00% 2.00% 2.00% 2.00% The term loans under each of the Credit Facilities 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 Revolving Facility, 2014 Revolving Facility and April 2016 Revolving Facility provide that American may from time to time borrow, repay and reborrow loans thereunder. The 2013 Revolving Facility and 2014 Revolving Facility have the ability to issue letters of credit thereunder in an aggregate amount outstanding at any time up to $100 million and $200 million , respectively. The 2013 Revolving Facility, 2014 Revolving Facility and April 2016 Revolving Facility are each subject to an undrawn annual fee of 0.63% . As of December 31, 2018 , there were no borrowings or letters of credit outstanding under the 2013 Revolving Facility, 2014 Revolving Facility or April 2016 Revolving Facility. The December 2016 Credit Facilities provide for a revolving credit facility that may be established thereunder 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 Revolving Facility, 2014 Revolving Facility and April 2016 Revolving Facility and any revolving credit facility 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 Below is a discussion of the 2018 aircraft financing activities resulting from EETC issuances. 2017-2 EETCs In August and October 2017, American created three pass-through trusts which issued approximately $1.0 billion aggregate face amount of Series 2017-2 Class AA, Class A and Class B EETCs (the 2017-2 EETCs) in connection with the financing of 30 aircraft delivered to American through May 2018 (the 2017-2 Aircraft). In 2017, approximately $735 million of the net proceeds were used to purchase equipment notes issued by American in connection with the financing of 24 aircraft financed under the 2017-2 EETC. During the first six months of 2018, the remaining $283 million of net proceeds was used to purchase equipment notes issued by American in connection with the financing of the remaining six aircraft financed under the 2017-2 EETCs. 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 that began in April 2018 and principal payments that began in October 2018. These equipment notes are secured by liens on the 2017-2 Aircraft. Certain information regarding the 2017-2 EETC equipment notes, as of December 31, 2018 , 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 Fixed interest rate per annum 3.35% 3.60% 3.70% Maturity date October 2029 October 2029 October 2025 2012-2C(R) EETCs On May 15, 2018, American created a pass-through trust which issued $100 million aggregate face amount of the Series 2012-2 Class C(R) EETCs (the 2012-2C(R) EETCs). Interest and principal payments on equipment notes issued in connection with the 2012-2C(R) EETCs are payable semi-annually in June and December of each year, which began in December 2018. American had previously issued $100 million aggregate face amount of Series 2012-2 Class C Certificates on June 6, 2013 (the 2012-2C Certificates) in connection with the financing of 11 aircraft previously delivered to American between May 2013 and October 2013. On June 1, 2018, American redeemed the Series C Equipment Notes relating to such 2012-2C Certificates (the 2012-2C Equipment Notes), which were scheduled to mature on June 3, 2018. The proceeds received from the 2012-2C(R) EETCs were used for the redemption of the 2012-2 Series C Equipment Notes and the repayment of the 2012-2C Certificates. Certain information regarding the 2012-2 Class C(R) EETC equipment notes, as of December 31, 2018 , is set forth in the table below. 2012-2C(R) EETCs Series C(R) Aggregate principal issued $100 million Fixed interest rate per annum 4.70% Maturity date June 2021 (c) Equipment Loans and Other Notes Payable Issued in 2018 In 2018 , American entered into agreements under which it borrowed $1.5 billion in connection with the financing of certain aircraft and certain pre-delivery purchase deposits. Debt incurred under these agreements matures in 2021 through 2030 and bears interest at fixed and variable rates of LIBOR plus an applicable margin averaging 4.28% at December 31, 2018 . Guarantees As of December 31, 2018 , American had issued guarantees covering AAG’s $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 its 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 34.8% 18.8% 40.9% 57.5% 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 European Union (including 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, 2018 , American was in compliance with the applicable collateral coverage tests as of the most recent measurement dates.

Leases

Leases	12 Months Ended
	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Leases	Leases We lease certain aircraft and engines, including aircraft under capacity purchase agreements. As of December 31, 2018 , we had 660 leased aircraft, with remaining terms ranging from less than one year to 12 years . At each airport where we conduct flight operations, we have agreements, generally with a governmental unit or authority, for the use of passenger, operations and baggage handling space as well as runways and taxiways. These agreements, particularly in the U.S., often contain provisions for periodic adjustments to rates and charges applicable under such agreements. These rates and charges also vary with our level of operations and the operations of the airport. Additionally, at our hub locations and in certain other cities we serve, we lease administrative offices, catering, cargo, training, maintenance and other facilities. The components of lease expense were as follows (in millions): Year Ended Operating lease cost $ 1,907 Finance lease cost: Amortization of assets 78 Interest on lease liabilities 48 Variable lease cost 2,353 Total net lease cost $ 4,386 Included in the table above is $226 million of operating lease cost under our capacity purchase agreement with Republic. We hold a 25% equity interest in Republic Holdings, the parent company of Republic. Supplemental balance sheet information related to leases was as follows (in millions, except lease term and discount rate): December 31, 2018 Operating leases: Operating lease ROU assets $ 9,151 Current operating lease liabilities $ 1,654 Noncurrent operating lease liabilities 7,902 Total operating lease liabilities $ 9,556 Finance leases: Property and equipment, at cost $ 936 Accumulated amortization (391 ) Property and equipment, net $ 545 Current obligations of finance leases $ 81 Finance leases, net of current obligations 613 Total finance lease liabilities $ 694 Weighted average remaining lease term (in years): Operating leases 7.6 Finance leases 7.4 Weighted average discount rate: Operating leases 4.6 % Finance leases 6.5 % Supplemental cash flow and other information related to leases was as follows (in millions): Year Ended Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 1,931 Operating cash flows from finance leases 48 Financing cash flows from finance leases 78 ROU assets obtained in exchange for lease liabilities: Operating leases 1,292 Gain on sale leaseback transactions, net 59 Maturities of lease liabilities were as follows (in millions): December 31, 2018 Operating Leases Finance Leases 2019 $ 1,912 $ 124 2020 1,838 120 2021 1,636 118 2022 1,438 122 2023 1,255 105 2024 and thereafter 3,620 282 Total lease payments 11,699 871 Less: Imputed interest (2,143 ) (177 ) Total lease obligations 9,556 694 Less: Current obligations (1,654 ) (81 ) Long-term lease obligations $ 7,902 $ 613 As of December 31, 2018 , we have additional operating lease commitments that have not yet commenced of approximately $1.9 billion for 22 787-8 aircraft to be delivered in 2020 and 2021 with lease terms of 10 years . Disclosures related to periods prior to adoption of the New Lease Standard Operating lease rent expense, excluding landing fees, was approximately $3.2 billion in each of 2017 and 2016 , which includes the lease of certain aircraft under capacity purchase agreements. As of December 31, 2017 , future minimum lease payment obligations under noncancellable operating leases, including payments for the lease of certain aircraft under capacity purchase agreements, as well as payments under capital lease obligations were as follows (in millions): December 31, 2017 Operating Leases Capital Leases 2018 $ 2,572 $ 126 2019 2,329 123 2020 2,104 120 2021 1,621 118 2022 1,398 122 2023 and thereafter 3,965 387 Total lease payments $ 13,989 996 Less: Imputed interest (225 ) Total lease obligations 771 Less: Current obligations (78 ) Long-term lease obligations $ 693
American Airlines, Inc. [Member]
Lessee, Lease, Description [Line Items]
Leases	Leases American leases certain aircraft and engines, including aircraft under capacity purchase agreements. As of December 31, 2018 , American had 660 leased aircraft, with remaining terms ranging from less than one year to 12 years . At each airport where American conducts flight operations, American has agreements, generally with a governmental unit or authority, for the use of passenger, operations and baggage handling space as well as runways and taxiways. These agreements, particularly in the U.S., often contain provisions for periodic adjustments to rates and charges applicable under such agreements. These rates and charges also vary with American’s level of operations and the operations of the airport. Additionally, at American’s hub locations and in certain other cities it serves, American leases administrative offices, catering, cargo, training, maintenance and other facilities. The components of lease expense were as follows (in millions): Year Ended Operating lease cost $ 1,889 Finance lease cost: Amortization of assets 78 Interest on lease liabilities 48 Variable lease cost 2,353 Total net lease cost $ 4,368 Included in the table above is $226 million of operating lease cost under American’s capacity purchase agreement with Republic. American holds a 25% equity interest in Republic Holdings, the parent company of Republic. Supplemental balance sheet information related to leases was as follows (in millions, except lease term and discount rate): December 31, 2018 Operating leases: Operating lease ROU assets $ 9,094 Current operating lease liabilities 1,639 Noncurrent operating lease liabilities 7,857 Total operating lease liabilities $ 9,496 Finance leases: Property and equipment, at cost $ 936 Accumulated amortization (391 ) Property and equipment, net $ 545 Current obligations of finance leases $ 81 Finance leases, net of current obligations 613 Total finance lease liabilities $ 694 Weighted average remaining lease term (in years): Operating leases 7.6 Finance leases 7.4 Weighted average discount rate: Operating leases 4.6 % Finance leases 6.5 % Supplemental cash flow and other information related to leases was as follows (in millions): Year Ended Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 1,914 Operating cash flows from finance leases 48 Financing cash flows from finance leases 78 ROU assets obtained in exchange for lease liabilities: Operating leases 1,258 Gain on sale leaseback transactions, net 59 Maturities of lease liabilities were as follows (in millions): December 31, 2018 Operating Leases Finance Leases 2019 $ 1,894 $ 124 2020 1,824 120 2021 1,625 118 2022 1,428 122 2023 1,250 105 2024 and thereafter 3,611 282 Total lease payments 11,632 871 Less: Imputed interest (2,136 ) (177 ) Total lease obligations 9,496 694 Less: Current obligations (1,639 ) (81 ) Long-term lease obligations $ 7,857 $ 613 As of December 31, 2018 , American has additional operating lease commitments that have not yet commenced of approximately $1.9 billion for 22 787-8 aircraft to be delivered in 2020 and 2021 with lease terms of 10 years . Disclosures related to periods prior to adoption of the New Lease Standard Operating lease rent expense, excluding landing fees, was approximately $3.2 billion and $3.1 billion in 2017 and 2016 , respectively, which includes the lease of certain aircraft under capacity purchase agreements. As of December 31, 2017 , future minimum lease payment obligations under noncancellable operating leases, including payments for the lease of certain aircraft under capacity purchase agreements, as well as payments under capital lease obligations were as follows (in millions): December 31, 2017 Operating Leases Capital Leases 2018 $ 2,555 $ 126 2019 2,321 123 2020 2,096 120 2021 1,613 118 2022 1,394 122 2023 and thereafter 3,952 387 Total lease payments $ 13,931 996 Less: Imputed interest (225 ) Total lease obligations 771 Less: Current obligations (78 ) Long-term lease obligations $ 693

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Taxes [Line Items]
Income Taxes	Income Taxes The significant components of the income tax provision were (in millions): Year Ended December 31, 2018 2017 2016 Current income tax provision: State and Local $ 3 $ 10 $ 3 Foreign 29 14 9 Current income tax provision 32 24 12 Deferred income tax provision: Federal 390 2,026 1,456 State and Local 50 63 100 Deferred income tax provision 440 2,089 1,556 Total income tax provision $ 472 $ 2,113 $ 1,568 The income tax provision differed from amounts computed at the statutory federal income tax rate as follows (in millions): Year Ended December 31, 2018 2017 2016 Statutory income tax provision $ 396 $ 1,188 $ 1,453 State income tax provision, net of federal tax effect 44 59 56 Foreign income taxes, net of federal tax effect 23 7 6 Book expenses not deductible for tax purposes 12 33 35 Bankruptcy administration expenses — 1 1 2017 Tax Act — 823 — Change in valuation allowance (6 ) (3 ) 7 Other, net 3 5 10 Income tax provision $ 472 $ 2,113 $ 1,568 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. The total decrease to the valuation allowance was $6 million in 2018 . In 2017 , the total increase to the valuation allowance was $7 million , $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 . The components of our deferred tax assets and liabilities were (in millions): December 31, 2018 2017 Deferred tax assets: Operating loss carryforwards $ 2,343 $ 2,281 Leases 2,189 107 Pensions 1,430 1,559 Loyalty program liability 1,770 1,809 Alternative minimum tax (AMT) credit carryforwards 175 344 Postretirement benefits other than pensions 145 170 Rent expense 136 160 Reorganization items 33 35 Other 631 678 Total deferred tax assets 8,852 7,143 Valuation allowance (30 ) (36 ) Net deferred tax assets 8,822 7,107 Deferred tax liabilities: Accelerated depreciation and amortization (5,280 ) (5,045 ) Leases (2,081 ) — Other (326 ) (279 ) Total deferred tax liabilities (7,687 ) (5,324 ) Net deferred tax asset $ 1,135 $ 1,783 At December 31, 2018 , we had approximately $10.2 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 2019. The federal NOL Carryforwards will expire beginning in 2022 if unused. We also had approximately $3.2 billion of NOL Carryforwards to reduce future state taxable income at December 31, 2018 , which will expire in years 2019 through 2038 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, 2018 ) 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, 2018 , we had an AMT credit carryforward of approximately $339 million available for federal income tax purposes, which is now expected to be fully refundable over the next several years as a result of the repeal of corporate AMT. In 2018 , we recorded an income tax provision of $472 million , with an effective rate of approximately 25% , which was substantially non-cash. The 2018 income tax provision included an $18 million special income tax charge related to an international income tax matter. 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 2015 through 2017 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. We have completed our evaluation of the 2017 Tax Act and we have reflected the impact 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 provision of $823 million to reflect these impacts of the 2017 Tax Act.
American Airlines, Inc. [Member]
Income Taxes [Line Items]
Income Taxes	Income Taxes The significant components of the income tax provision were (in millions): Year Ended December 31, 2018 2017 2016 Current income tax provision: State and Local $ 3 $ 14 $ 1 Foreign 28 10 9 Current income tax provision 31 24 10 Deferred income tax provision: Federal 453 2,176 1,507 State and Local 50 70 90 Deferred income tax provision 503 2,246 1,597 Total income tax provision $ 534 $ 2,270 $ 1,607 The income tax provision differed from amounts computed at the statutory federal income tax rate as follows (in millions): Year Ended December 31, 2018 2017 2016 Statutory income tax provision $ 460 $ 1,244 $ 1,504 State income tax provision, net of federal tax effect 46 53 61 Foreign income taxes, net of federal tax effect 22 6 6 Book expenses not deductible for tax purposes 10 30 32 Bankruptcy administration expenses — 1 1 2017 Tax Act — 924 — Change in valuation allowance (6 ) 4 (1 ) Other, net 2 8 4 Income tax provision $ 534 $ 2,270 $ 1,607 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. The total decrease to the valuation allowance was $6 million in 2018 . In 2017 , the total increase to the valuation allowance was $12 million , $8 million of which is included in the 2017 Tax Act amount in the table above. In 2016 , the total decrease to the valuation allowance was $1 million . The components of American’s deferred tax assets and liabilities were (in millions): December 31, 2018 2017 Deferred tax assets: Operating loss carryforwards $ 2,420 $ 2,409 Leases 2,176 107 Pensions 1,421 1,549 Loyalty program liability 1,770 1,809 Alternative minimum tax (AMT) credit carryforwards 231 457 Postretirement benefits other than pensions 145 170 Rent expense 136 160 Reorganization items 33 35 Other 588 638 Total deferred tax assets 8,920 7,334 Valuation allowance (19 ) (25 ) Net deferred tax assets 8,901 7,309 Deferred tax liabilities: Accelerated depreciation and amortization (5,243 ) (4,999 ) Leases (2,068 ) — Other (321 ) (274 ) Total deferred tax liabilities (7,632 ) (5,273 ) Net deferred tax asset $ 1,269 $ 2,036 At December 31, 2018 , 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 2019. 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 $10.2 billion , substantially all of which is expected to be available for use in 2019. The federal NOL Carryforwards will expire beginning in 2022 if unused. American also had approximately $3.1 billion of NOL Carryforwards to reduce future state taxable income at December 31, 2018 , which will expire in years 2019 through 2038 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, 2018 ) 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, 2018 , American had an AMT credit carryforward of approximately $452 million available for federal income tax purposes, which is now expected to be fully refundable over the next several years as a result of the repeal of corporate AMT. In 2018 , American recorded an income tax provision of $534 million , with an effective rate of approximately 24% , which was substantially non-cash. American’s income tax provision included an $18 million special income tax charge related to an international income tax matter. 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 2015 through 2017 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. American has completed its evaluation of the 2017 Tax Act and American has reflected the impact 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 provision of $924 million to reflect these impacts of the 2017 Tax Act.

Risk Management

Risk Management	12 Months Ended
	Dec. 31, 2018
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. Market prices for jet fuel 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 $9.9 billion principal amount of long-term debt as of December 31, 2018 are subject to adjustment to reflect changes in floating interest rates. The weighted average effective interest rate on our variable rate debt was 4.3% at December 31, 2018 . 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. Market prices for jet fuel 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 $9.9 billion principal amount of long-term debt as of December 31, 2018 are subject to adjustment to reflect changes in floating interest rates. The weighted average effective interest rate on American’s variable rate debt was 4.3% at December 31, 2018 . 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, 2018
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, 2018 . Assets measured at fair value on a recurring basis are summarized below (in millions): Fair Value Measurements as of December 31, 2018 Total Level 1 Level 2 Level 3 Short-term investments (1) (2) : Money market funds $ 16 $ 16 $ — $ — Corporate obligations 1,658 — 1,658 — Bank notes/certificates of deposit/time deposits 2,436 — 2,436 — Repurchase agreements 375 — 375 — 4,485 16 4,469 — Restricted cash and short-term investments (1) 154 12 142 — Long-term investments (3) 189 189 — — Total $ 4,828 $ 217 $ 4,611 $ — (1) Unrealized gains or losses on short-term investments are recorded in accumulated other comprehensive 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 $877 million of bank notes/certificates of deposit/time deposits and $101 million of corporate obligations. (3) Long-term investments primarily include our equity investment in China Southern Airlines, in which we presently own a 2.2% equity interest, and are classified in other assets on the consolidated balance sheets. 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 are recorded in accumulated other comprehensive 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 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, 2018 December 31, 2017 Carrying Value Fair Value Carrying Value Fair Value Long-term debt, including current maturities $ 23,779 $ 23,775 $ 24,294 $ 24,985
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, 2018 . Assets measured at fair value on a recurring basis are summarized below (in millions): Fair Value Measurements as of December 31, 2018 Total Level 1 Level 2 Level 3 Short-term investments (1) (2) : Money market funds $ 14 $ 14 $ — $ — Corporate obligations 1,658 — 1,658 — Bank notes/certificates of deposit/time deposits 2,435 — 2,435 — Repurchase agreements 375 — 375 — 4,482 14 4,468 — Restricted cash and short-term investments (1) 154 12 142 — Long-term investments (3) 189 189 — — Total $ 4,825 $ 215 $ 4,610 $ — (1) Unrealized gains or losses on short-term investments are recorded in accumulated other comprehensive 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 $877 million of bank notes/certificates of deposit/time deposits and $101 million of corporate obligations. (3) Long-term investments primarily include American's equity investment in China Southern Airlines, in which American presently owns a 2.2% equity interest, and are classified in other assets on the consolidated balance sheets. 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 are recorded in accumulated other comprehensive 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 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, 2018 December 31, 2017 Carrying Value Fair Value Carrying Value Fair Value Long-term debt, including current maturities $ 22,503 $ 22,497 $ 22,523 $ 23,165

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2018
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 accumulated other comprehensive income (loss) (AOCI) 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, 2018 , $390 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, 2018 and 2017 : Pension Benefits Retiree Medical and Other Postretirement Benefits 2018 2017 2018 2017 (In millions) Benefit obligation at beginning of period $ 18,275 $ 17,238 $ 1,011 $ 991 Service cost 3 2 5 4 Interest cost 674 721 35 39 Actuarial (gain) loss (1) (2) (1,910 ) 1,016 (133 ) 49 Settlements (4 ) (4 ) — — Benefit payments (662 ) (726 ) (81 ) (80 ) Other 2 28 — 8 Benefit obligation at end of period $ 16,378 $ 18,275 $ 837 $ 1,011 Fair value of plan assets at beginning of period $ 11,395 $ 10,017 $ 295 $ 266 Actual return on plan assets (1,151 ) 1,797 (24 ) 37 Employer contributions (3) 475 286 35 72 Settlements (4 ) (4 ) — — Benefit payments (662 ) (726 ) (81 ) (80 ) Other — 25 — — Fair value of plan assets at end of period $ 10,053 $ 11,395 $ 225 $ 295 Funded status at end of period $ (6,325 ) $ (6,880 ) $ (612 ) $ (716 ) (1) The December 31, 2018 and 2017 pension actuarial (gain) loss primarily relates to changes in our weighted average discount rate and mortality assumptions and, in 2018, changes to our retirement rate assumptions. (2) The December 31, 2018 and 2017 retiree medical and other postretirement benefits actuarial (gain) loss primarily relates to weighted average discount rate assumption changes and, in 2018, changes to our medical trend and per capita claim assumptions. (3) During 2018 , we contributed $475 million to our defined benefit pension plans, including supplemental contributions of $433 million in addition to a $42 million minimum required contribution. 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 contribution. Balance Sheet Position Pension Benefits Retiree Medical and Other Postretirement Benefits 2018 2017 2018 2017 (In millions) As of December 31, Current liability $ 7 $ 10 $ 23 $ 89 Noncurrent liability 6,318 6,870 589 627 Total liabilities $ 6,325 $ 6,880 $ 612 $ 716 Net actuarial loss (gain) $ 5,356 $ 5,351 $ (452 ) $ (388 ) Prior service cost (benefit) 131 160 (362 ) (600 ) Total accumulated other comprehensive loss (income), pre-tax $ 5,487 $ 5,511 $ (814 ) $ (988 ) Plans with Accumulated Benefit Obligations Exceeding Fair Value of Plan Assets Pension Benefits Retiree Medical and Other Postretirement Benefits 2018 2017 2018 2017 (In millions) Projected benefit obligation $ 16,351 $ 18,245 $ — $ — Accumulated benefit obligation (ABO) 16,341 18,235 — — Accumulated postretirement benefit obligation — — 837 1,011 Fair value of plan assets 10,023 11,364 225 295 ABO less fair value of plan assets 6,318 6,871 — — Net Periodic Benefit Cost (Income) Pension Benefits Retiree Medical and Other Postretirement Benefits 2018 2017 2016 2018 2017 2016 (In millions) Defined benefit plans: Service cost $ 3 $ 2 $ 2 $ 5 $ 4 $ 3 Interest cost 674 721 749 35 39 47 Expected return on assets (905 ) (790 ) (750 ) (24 ) (21 ) (20 ) Settlements — 1 — — — — Amortization of: Prior service cost (benefit) 28 28 28 (236 ) (237 ) (240 ) Unrecognized net loss (gain) 141 144 126 (21 ) (23 ) (17 ) Net periodic benefit cost (income) $ (59 ) $ 106 $ 155 $ (241 ) $ (238 ) $ (227 ) The components of net periodic benefit income other than the service cost component are included in nonoperating other income, net in our consolidated statements of operations. The estimated amount of unrecognized actuarial net loss and prior service cost for the defined benefit pension plans that will be amortized from AOCI into net periodic benefit cost over the next fiscal year is $181 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 AOCI into net periodic benefit cost over the next fiscal year is $269 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 2018 2017 2018 2017 Benefit obligations: Weighted average discount rate 4.40% 3.80% 4.30% 3.60% Pension Benefits Retiree Medical and Other Postretirement Benefits 2018 2017 2016 2018 2017 2016 Net periodic benefit cost: Weighted average discount rate 3.80% 4.30% 4.70% 3.60% 4.10% 4.42% 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 3.91% 4.19% 4.25% (1) The weighted average health care cost trend rate at December 31, 2018 is assumed to decline gradually to 3.45% by 2026 and remain level thereafter. As of December 31, 2018 , 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 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 2018 service and interest cost $ 2 $ (2 ) Increase (decrease) on benefit obligation as of December 31, 2018 47 (43 ) 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 underfunding rules specific to countries where we maintain defined benefit plans. Based on current funding assumptions, we have minimum required contributions of $786 million for 2019 including contributions to defined benefit plans for our wholly-owned regional subsidiaries. We expect to make supplemental contributions of $21 million to our U.S. based defined benefit pension plans in 2019 . Our funding 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): 2019 2020 2021 2022 2023 2024-2028 Pension benefits $ 720 $ 758 $ 797 $ 836 $ 876 $ 4,917 Retiree medical and other postretirement benefits 84 75 71 66 64 280 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 60% - 85% 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% Cash Equivalents 0% - 5% Public equity as well as high yield 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. 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, 2018 and 2017 , by asset category, are as follows (in millions): Fair Value Measurements as of December 31, 2018 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 $ 23 $ — $ — $ 23 Equity securities: International markets (a) (b) 3,181 — — 3,181 Large-cap companies (b) 2,021 — — 2,021 Mid-cap companies (b) 583 — — 583 Small-cap companies (b) 122 — — 122 Mutual funds (c) 52 — — 52 Fixed income: Corporate debt (d) — 2,116 — 2,116 Government securities (e) — 228 — 228 U.S. municipal securities — 40 — 40 Alternative instruments: Private market partnerships (f) — — 7 7 Private market partnerships measured at net asset value (f) (h) — — — 1,188 Common/collective trusts (g) — 218 — 218 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 47 — — 47 Due to/from brokers for sale of securities – net 5 — — 5 Other liabilities – net (7 ) — — (7 ) Total $ 6,027 $ 2,602 $ 9 $ 10,053 (a) Holdings are diversified as follows: 17% United Kingdom, 10% Japan, 8% France, 7% Switzerland, 6% Ireland, 17% emerging markets and the remaining 35% 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 37% in equity securities of large-cap, mid-cap and small-cap U.S. companies, 38% in U.S. treasuries and corporate bonds and 25% in equity securities of international companies. (d) Includes approximately 77% investments in corporate debt with a S&P rating lower than A and 23% 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 32% investments in U.S. domestic government securities, 37% in emerging market government securities and 31% 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 $1.0 billion over the next ten years . (g) Investment includes 45% in an emerging market 103-12 Investment Trust with investments in emerging country equity securities, 37% in a collective interest trust investing primarily in short-term securities, 12% in Canadian segregated balanced value, income growth and diversified pooled funds and 6% 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, 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 market partnerships (f) — — 14 14 Private market 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. Changes in fair value measurements of Level 3 investments during the year ended December 31, 2018 , were as follows (in millions): Private Market Partnerships Insurance Group Annuity Contracts Beginning balance at December 31, 2017 $ 14 $ 2 Actual loss on plan assets: Relating to assets still held at the reporting date (2 ) — Purchases 1 — Sales (6 ) — Ending balance at December 31, 2018 $ 7 $ 2 Changes in fair value measurements of Level 3 investments during the year ended December 31, 2017 , were as follows (in millions): Private Market 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 The fair value of our retiree medical and other postretirement benefits plans assets at December 31, 2018 by asset category, were as follows (in millions): Fair Value Measurements as of December 31, 2018 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 $ 4 $ — $ — $ 4 Mutual funds – AAL Class — 221 — 221 Total $ 4 $ 221 $ — $ 225 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 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. The AAL Class mutual fund restricts trading only to American, resulting in a fair value classification of Level 2. Investments included approximately 30% of investments in non-U.S. common stocks in both 2018 and 2017 . Net asset value is based on the fair market value of the funds’ underlying assets and liabilities at the date of determination. Defined Contribution Plans We contributed $877 million , $851 million and $766 million to our defined contribution plans for the years ended December 31, 2018 , 2017 and 2016 , respectively. 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, 2018 , we accrued $175 million for this program, which will be distributed to employees in the first quarter of 2019 .
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 accumulated other comprehensive income (loss) (AOCI) 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, 2018 , $390 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, 2018 and 2017 : Pension Benefits Retiree Medical and Other Postretirement Benefits 2018 2017 2018 2017 (In millions) Benefit obligation at beginning of period $ 18,175 $ 17,148 $ 1,010 $ 990 Service cost 2 2 5 4 Interest cost 670 717 35 39 Actuarial (gain) loss (1) (2) (1,905 ) 1,007 (132 ) 49 Settlements (4 ) (4 ) — — Benefit payments (659 ) (723 ) (81 ) (80 ) Other 3 28 — 8 Benefit obligation at end of period $ 16,282 $ 18,175 $ 837 $ 1,010 Fair value of plan assets at beginning of period $ 11,340 $ 9,968 $ 295 $ 266 Actual return on plan assets (1,148 ) 1,788 (24 ) 37 Employer contributions (3) 472 286 35 72 Settlements (4 ) (4 ) — — Benefit payments (659 ) (723 ) (81 ) (80 ) Other — 25 — — Fair value of plan assets at end of period $ 10,001 $ 11,340 $ 225 $ 295 Funded status at end of period $ (6,281 ) $ (6,835 ) $ (612 ) $ (715 ) (1) The December 31, 2018 and 2017 pension actuarial (gain) loss primarily relates to changes in American’s weighted average discount rate and mortality assumptions and, in 2018, changes to American’s retirement rate assumptions. (2) The December 31, 2018 and 2017 retiree medical and other postretirement benefits actuarial (gain) loss primarily relates to weighted average discount rate assumption changes and, in 2018, changes to American’s medical trend and per capita claim assumptions. (3) During 2018 , American contributed $472 million to its defined benefit pension plans, including supplemental contributions of $433 million in addition to a $39 million minimum required contribution. 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 contribution. Balance Sheet Position Pension Benefits Retiree Medical and Other Postretirement Benefits 2018 2017 2018 2017 (In millions) As of December 31, Current liability $ 7 $ 10 $ 23 $ 88 Noncurrent liability 6,274 6,825 589 627 Total liabilities $ 6,281 $ 6,835 $ 612 $ 715 Net actuarial loss (gain) $ 5,341 $ 5,337 $ (452 ) $ (388 ) Prior service cost (benefit) 131 159 (362 ) (600 ) Total accumulated other comprehensive loss (income), pre-tax $ 5,472 $ 5,496 $ (814 ) $ (988 ) Plans with Accumulated Benefit Obligations Exceeding Fair Value of Plan Assets Pension Benefits Retiree Medical and Other Postretirement Benefits 2018 2017 2018 2017 (In millions) Projected benefit obligation $ 16,254 $ 18,144 $ — $ — Accumulated benefit obligation (ABO) 16,246 18,135 — — Accumulated postretirement benefit obligation — — 837 1,010 Fair value of plan assets 9,971 11,307 225 295 ABO less fair value of plan assets 6,275 6,828 — — Net Periodic Benefit Cost (Income) Pension Benefits Retiree Medical and Other Postretirement Benefits 2018 2017 2016 2018 2017 2016 (In millions) Defined benefit plans: Service cost $ 2 $ 2 $ 2 $ 5 $ 4 $ 3 Interest cost 670 717 746 35 39 47 Expected return on assets (901 ) (786 ) (747 ) (24 ) (21 ) (20 ) Settlements — 1 — — — — Amortization of: Prior service cost (benefit) 28 28 28 (236 ) (237 ) (240 ) Unrecognized net loss (gain) 140 144 125 (21 ) (23 ) (16 ) Net periodic benefit cost (income) $ (61 ) $ 106 $ 154 $ (241 ) $ (238 ) $ (226 ) The components of net periodic benefit income other than the service cost component are included in nonoperating other income, net in American’s consolidated statements of operations. The estimated amount of unrecognized actuarial net loss and prior service cost for the defined benefit pension plans that will be amortized from AOCI into net periodic benefit cost over the next fiscal year is $181 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 AOCI into net periodic benefit cost over the next fiscal year is $269 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 2018 2017 2018 2017 Benefit obligations: Weighted average discount rate 4.40% 3.80% 4.30% 3.60% Pension Benefits Retiree Medical and Other Postretirement Benefits 2018 2017 2016 2018 2017 2016 Net periodic benefit cost: Weighted average discount rate 3.80% 4.30% 4.70% 3.60% 4.10% 4.42% 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 3.91% 4.19% 4.25% (1) The weighted average health care cost trend rate at December 31, 2018 is assumed to decline gradually to 3.45% by 2026 and remain level thereafter. As of December 31, 2018 , 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 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 2018 service and interest cost $ 2 $ (2 ) Increase (decrease) on benefit obligation as of December 31, 2018 47 (43 ) 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 underfunding rules specific to countries where American maintains defined benefit plans. Based on current funding assumptions, American has minimum required contributions of $780 million for 2019 . American expects to make supplemental contributions of $21 million to its U.S. based defined benefit pension plans in 2019 . American’s funding 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): 2019 2020 2021 2022 2023 2024-2028 Pension benefits $ 717 $ 754 $ 793 $ 831 $ 872 $ 4,891 Retiree medical and other postretirement benefits 84 75 71 66 64 280 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 60% - 85% 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% Cash Equivalents 0% - 5% Public equity as well as high yield 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. 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, 2018 and 2017 , by asset category, are as follows (in millions): Fair Value Measurements as of December 31, 2018 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 $ 23 $ — $ — $ 23 Equity securities: International markets (a) (b) 3,181 — — 3,181 Large-cap companies (b) 2,021 — — 2,021 Mid-cap companies (b) 583 — — 583 Small-cap companies (b) 122 — — 122 Fixed income: Corporate debt (c) — 2,116 — 2,116 Government securities (d) — 228 — 228 U.S. municipal securities — 40 — 40 Alternative instruments: Private market partnerships (e) — — 7 7 Private market partnerships measured at net asset value (e) (g) — — — 1,188 Common/collective trusts (f) — 218 — 218 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 47 — — 47 Due to/from brokers for sale of securities – net 5 — — 5 Other liabilities – net (7 ) — — (7 ) Total $ 5,975 $ 2,602 $ 9 $ 10,001 (a) Holdings are diversified as follows: 17% United Kingdom, 10% Japan, 8% France, 7% Switzerland, 6% Ireland, 17% emerging markets and the remaining 35% 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 77% investments in corporate debt with a S&P rating lower than A and 23% 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 32% investments in U.S. domestic government securities, 37% in emerging market government securities and 31% 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 $1.0 billion over the next ten years . (f) Investment includes 45% in an emerging market 103-12 Investment Trust with investments in emerging country equity securities, 37% in a collective interest trust investing primarily in short-term securities, 12% in Canadian segregated balanced value, income growth and diversified pooled funds and 6% 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, 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 market partnerships (e) — — 14 14 Private market 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. Changes in fair value measurements of Level 3 investments during the year ended December 31, 2018 , were as follows (in millions): Private Market Partnerships Insurance Group Annuity Contracts Beginning balance at December 31, 2017 $ 14 $ 2 Actual loss on plan assets: Relating to assets still held at the reporting date (2 ) — Purchases 1 — Sales (6 ) — Ending balance at December 31, 2018 $ 7 $ 2 Changes in fair value measurements of Level 3 investments during the year ended December 31, 2017 , were as follows (in millions): Private Market 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 The fair value of American’s retiree medical and other postretirement benefits plans assets at December 31, 2018 by asset category, were as follows (in millions): Fair Value Measurements as of December 31, 2018 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 $ 4 $ — $ — $ 4 Mutual funds – AAL Class — 221 — 221 Total $ 4 $ 221 $ — $ 225 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 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. The AAL Class mutual fund restricts trading only to American, resulting in a fair value classification of Level 2. Investments included approximately 30% of investments in non-U.S. common stocks in both 2018 and 2017 . Net asset value is based on the fair market value of the funds’ underlying assets and liabilities at the date of determination. Defined Contribution Plans American contributed $856 million , $844 million and $761 million to its defined contribution plans for the years ended December 31, 2018 , 2017 and 2016 , respectively. 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, 2018 , American accrued $175 million for this program, which will be distributed to employees in the first quarter of 2019 .

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss The components of AOCI are as follows (in millions): Pension, Unrealized Loss on Investments Income Tax (1) Total 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 ) Other comprehensive income (loss) before reclassifications (62 ) (4 ) 15 (51 ) Amounts reclassified from AOCI (88 ) — 19 (2) (69 ) Net current-period other comprehensive income (loss) (150 ) (4 ) 34 (120 ) Balance at December 31, 2018 $ (4,673 ) $ (5 ) $ (596 ) $ (5,274 ) (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 our consolidated statements of operations. Reclassifications out of AOCI for the years ended December 31, 2018 and 2017 are as follows (in millions): Amounts reclassified from AOCI Affected line items on the Year Ended December 31, AOCI Components 2018 2017 Amortization of pension, retiree medical and other postretirement benefits: Prior service benefit $ (161 ) $ (132 ) Nonoperating other income, net Actuarial loss 92 77 Nonoperating other income, net Total reclassifications for the period, net of tax $ (69 ) $ (55 ) Amounts allocated to other comprehensive income (OCI) for income taxes as further described in Note 7 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 Loss	Accumulated Other Comprehensive Loss The components of AOCI are as follows (in millions): Pension, Unrealized Loss on Investments Income Tax (1) Total 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 ) Other comprehensive income (loss) before reclassifications (61 ) (4 ) 15 (50 ) Amounts reclassified from AOCI (89 ) — 20 (2) (69 ) Net current-period other comprehensive income (loss) (150 ) (4 ) 35 (119 ) Balance at December 31, 2018 $ (4,658 ) $ (5 ) $ (707 ) $ (5,370 ) (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 American’s consolidated statements of operations. Reclassifications out of AOCI for the years ended December 31, 2018 and 2017 are as follows (in millions): Amounts reclassified from AOCI Affected line items on the Year Ended December 31, AOCI Components 2018 2017 Amortization of pension, retiree medical and other postretirement benefits: Prior service benefit $ (161 ) $ (132 ) Nonoperating other income, net Actuarial loss 92 77 Nonoperating other income, net Total reclassifications for the period, net of tax $ (69 ) $ (55 ) Amounts allocated to other comprehensive income (OCI) for income taxes as further described in Note 5 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, 2018
Commitments and Contingencies [Line Items]
Commitments, Contingencies and Guarantees	Commitments, Contingencies and Guarantees (a) Aircraft, Engine and Other Purchase Commitments Under all of our aircraft and engine purchase agreements, our total future commitments as of December 31, 2018 are expected to be as follows (approximately, in millions): 2019 2020 2021 2022 2023 2024 and Thereafter Total Payments for aircraft commitments and certain engines (1) $ 2,906 $ 1,683 $ 994 $ 1,378 $ 1,450 $ 6,047 $ 14,458 (1) These amounts are net of purchase deposits currently held by the manufacturers and include all commitments for regional aircraft. We have granted a security interest in certain of our purchase deposits with Boeing. Our purchase deposits held by all manufacturers totaled $1.3 billion as of December 31, 2018 . Additionally, we have purchase commitments related to jet fuel, construction projects and information technology support as follows (approximately): $1.9 billion in 2019 , $1.1 billion in 2020 , $1.0 billion in 2021 , $32 million in 2022 and $7 million in 2023 . (b) 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 either reimburses or pays 100% of certain variable costs, such as airport landing fees, fuel and passenger liability insurance. American controls marketing, scheduling, ticketing, pricing and seat inventories. As of December 31, 2018 , American’s capacity purchase agreements with third-party regional carriers had expiration dates ranging from 2019 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, 2018 , American’s minimum fixed obligations under its capacity purchase agreements with third-party regional carriers are as follows (approximately, in millions): 2019 2020 2021 2022 2023 2024 and Thereafter Total Minimum fixed obligations under capacity purchase agreements with third-party regional carriers (1) $ 1,101 $ 930 $ 765 $ 618 $ 487 $ 1,043 $ 4,944 (1) Represents minimum payments under capacity purchase agreements with third-party regional carriers, which are estimates of costs based on assumed minimum levels of flying under the capacity purchase agreements and American’s actual payments could differ materially. Excludes payments for the lease of certain aircraft under capacity purchase agreements, which are reflected in the operating lease obligations in Note 6. (c) Airport Redevelopment Los Angeles International Airport (LAX) In 2018 , we executed a lease agreement with Los Angeles World Airports (LAWA), which owns and operates LAX, in connection with a $1.6 billion modernization project related to LAX Terminals 4 and 5. Construction will occur in a phased approach, which started in October 2018 and is expected to be completed in 2028. The modernization project will include a unified departure hall to combine the entranceway of Terminals 4 and 5, reconfigured ticket counter and check-in areas with seamless access to security screening areas, 16 security screening lanes with automated technology and upgraded amenities at gate areas. The project will also include renovated break rooms, multi-use meeting rooms and team gathering spaces throughout the terminals to support our team members at LAX. We are managing this project and have legal title to the assets during their construction. As each phase is completed, the assets will be sold and transferred to LAWA, including the site improvements and non-proprietary improvements. As we control the assets during construction, they are recognized on our balance sheet until legal title has transferred. For 2018 , we incurred approximately $7 million in costs relating to the LAX modernization project, which are included within operating property and equipment on our consolidated balance sheet as of December 31, 2018 . (d) Off-Balance Sheet Arrangements Aircraft American currently operates 389 owned aircraft and 88 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, 2018 , $11.6 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 payments to the trusts of each of the relevant EETCs under these leveraged lease financings are $352 million as of December 31, 2018 , which are reflected in the operating lease obligations in Note 6. Letters of Credit and Other We provide financial assurance, such as letters of credit, surety bonds or restricted cash and investments, primarily to support projected workers’ compensation obligations and airport commitments. As of December 31, 2018 , we had $460 million of letters of credit and surety bonds securing various obligations. 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. The shares of AAG common stock issued to the Disputed Claims Reserve were originally issued on December 13, 2013 and have at all times since been included in the number of shares issued and outstanding as reported from time to time in our quarterly and annual reports, including for purposes of calculating earnings per share. As disputed claims are resolved, the claimants will receive distributions of shares from the Disputed Claims Reserve. However, we are not required to distribute additional shares above the limits contemplated by the Plan, even if the shares remaining for distribution in the Disputed Claims Reserve 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 and former convertible noteholders treated as stockholders under the Plan. On February 12, 2019, in accordance with the approval granted by the Bankruptcy Court on December 6, 2018, an aggregate of approximately 17.3 million shares of AAG common stock were distributed from the Disputed Claims Reserve to former AMR shareholders and convertible noteholders. After giving effect to this distribution, the Disputed Claims Reserve holds approximately 7.2 million shares of AAG common stock. Private Party Antitrust Action Related to Passenger Capacity. 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. The U.S. lawsuits have been consolidated in the Federal District Court for the District of Columbia (the DC Court). On June 15, 2018, we reached a preliminary settlement agreement with the plaintiffs in the amount of $45 million that, once approved, will resolve all claims in the U.S. lawsuits. That settlement received preliminary approval from the DC Court on June 18, 2018. Private Party Antitrust Action Related to the Merger . On August 6, 2013, a lawsuit captioned Carolyn Fjord, et al., v. AMR Corporation, et al., was filed in the United States Bankruptcy Court for the Southern District of New York. The complaint named as defendants US Airways Group, US Airways, AMR and American, 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 November 27, 2013, the Bankruptcy Court denied plaintiffs’ motion to preliminarily enjoin the Merger. On August 29, 2018, the Court denied in part defendants' motion for summary judgment, and fully denied plaintiffs' cross-motion for summary judgment. A bench trial is presently scheduled for March 2019. 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 Department of Justice (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 Civil Investigative Demand 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 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 (including certain 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, 2018 , the remaining lease payments through 2035 guaranteeing the principal and interest on these bonds are $588 million and the current carrying amount of the associated operating lease liability in the accompanying consolidated balance sheet is $321 million . As of December 31, 2018 , AAG had issued guarantees covering approximately $769 million principal amount of American’s special facility revenue bonds (and interest thereon) and $8.4 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 credit card 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. These credit card processing companies are not currently entitled to maintain any holdbacks pursuant to these requirements. (h) Labor Negotiations As of December 31, 2018 , we employed approximately 128,900 active full-time equivalent employees, of which 26,000 were employed by our regional operations. Approximately 84% of employees are covered by collective bargaining agreements (CBAs) with various labor unions and approximately 22% of employees are covered by CBAs that will become amendable within one year. Negotiations are continuing for joint collective bargaining agreements (JCBAs) covering our mainline maintenance, fleet service, stock clerks, maintenance control technicians and maintenance training instructors as well as for CBAs covering certain employee groups at our wholly-owned regional subsidiaries. Additionally, the post-Merger JCBAs covering our pilots and flight attendants, while not yet amendable, provide the unions with the right to elect to commence negotiations for new collective bargaining agreements in advance of each JCBA’s amendable date. Each of the unions has exercised these rights and negotiations are underway for new agreements as described in Part I, Item 1. Business - “ Employees and Labor Relations ”. There is no assurance that a successful or timely resolution of these labor negotiations will be achieved.
American Airlines, Inc. [Member]
Commitments and Contingencies [Line Items]
Commitments, Contingencies and Guarantees	Commitments, Contingencies and Guarantees (a) Aircraft, Engine and Other Purchase Commitments Under all of American’s aircraft and engine purchase agreements, its total future commitments as of December 31, 2018 are expected to be as follows (approximately, in millions): 2019 2020 2021 2022 2023 2024 and Thereafter Total Payments for aircraft commitments and certain engines (1) $ 2,906 $ 1,683 $ 994 $ 1,378 $ 1,450 $ 6,047 $ 14,458 (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 certain of its purchase deposits with Boeing. American’s purchase deposits held by all manufacturers totaled $1.3 billion as of December 31, 2018 . Additionally, American has purchase commitments related to jet fuel, construction projects and information technology support as follows (approximately): $1.9 billion in 2019 , $1.1 billion in 2020 , $1.0 billion in 2021 , $32 million in 2022 and $7 million in 2023 . (b) 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 either reimburses or pays 100% of certain variable costs, such as airport landing fees, fuel and passenger liability insurance. American controls marketing, scheduling, ticketing, pricing and seat inventories. As of December 31, 2018 , American’s capacity purchase agreements with third-party regional carriers had expiration dates ranging from 2019 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, 2018 , American’s minimum fixed obligations under its capacity purchase agreements with third-party regional carriers are as follows (approximately, in millions): 2019 2020 2021 2022 2023 2024 and Thereafter Total Minimum fixed obligations under capacity purchase agreements with third-party regional carriers (1) $ 1,101 $ 930 $ 765 $ 618 $ 487 $ 1,043 $ 4,944 (1) Represents minimum payments under capacity purchase agreements with third-party regional carriers, which are estimates of costs based on assumed minimum levels of flying under the capacity purchase agreements and American’s actual payments could differ materially. Excludes payments for the lease of certain aircraft under capacity purchase agreements, which are reflected in the operating lease obligations in Note 4. (c) Airport Redevelopment Los Angeles International Airport (LAX) In 2018 , American executed a lease agreement with Los Angeles World Airports (LAWA), which owns and operates LAX, in connection with a $1.6 billion modernization project related to LAX Terminals 4 and 5. Construction will occur in a phased approach, which started in October 2018 and is expected to be completed in 2028. The modernization project will include a unified departure hall to combine the entranceway of Terminals 4 and 5, reconfigured ticket counter and check-in areas with seamless access to security screening areas, 16 security screening lanes with automated technology and upgraded amenities at gate areas. The project will also include renovated break rooms, multi-use meeting rooms and team gathering spaces throughout the terminals to support American’s team members at LAX. American is managing this project and has legal title to the assets during their construction. As each phase is completed, the assets will be sold and transferred to LAWA, including the site improvements and non-proprietary improvements. As American controls the assets during construction, they are recognized on its balance sheet until legal title has transferred. For 2018 , American incurred approximately $7 million in costs relating to the LAX modernization project, which are included within operating property and equipment on its consolidated balance sheet as of December 31, 2018 . (d) Off-Balance Sheet Arrangements Aircraft American currently operates 389 owned aircraft and 88 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, 2018 , $11.6 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 payments to the trusts of each of the relevant EETCs under these leveraged lease financings are $352 million as of December 31, 2018 , which are reflected in the operating lease obligations in Note 4. Letters of Credit and Other American provides financial assurance, such as letters of credit, surety bonds or restricted cash and investments, primarily to support projected workers’ compensation obligations and airport commitments. As of December 31, 2018 , American had $460 million of letters of credit and surety bonds securing various obligations. 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. The shares of AAG common stock issued to the Disputed Claims Reserve were originally issued on December 13, 2013 and have at all times since been included in the number of shares issued and outstanding as reported by AAG from time to time in its quarterly and annual reports, including for purposes of calculating earnings per share. As disputed claims are resolved, the claimants will receive distributions of shares from the Disputed Claims Reserve. However, American is not required to distribute additional shares above the limits contemplated by the Plan, even if the shares remaining for distribution in the Disputed Claims Reserve 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 AAG but rather will be distributed to former AMR stockholders and former convertible noteholders treated as stockholders under the Plan. On February 12, 2019, in accordance with the approval granted by the Bankruptcy Court on December 6, 2018, an aggregate of approximately 17.3 million shares of AAG common stock were distributed from the Disputed Claims Reserve to former AMR shareholders and convertible noteholders. After giving effect to this distribution, the Disputed Claims Reserve holds approximately 7.2 million shares of AAG common stock. Private Party Antitrust Action Related to Passenger Capacity. 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. The U.S. lawsuits have been consolidated in the Federal District Court for the District of Columbia (the DC Court). On June 15, 2018, American reached a preliminary settlement agreement with the plaintiffs in the amount of $45 million that, once approved, will resolve all claims in the U.S. lawsuits. That settlement received preliminary approval from the DC Court on June 18, 2018. Private Party Antitrust Action Related to the Merger . On August 6, 2013, a lawsuit captioned Carolyn Fjord, et al., v. AMR Corporation, et al., was filed in the United States Bankruptcy Court for the Southern District of New York. The complaint named as defendants US Airways Group, US Airways, AMR and American, 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 November 27, 2013, the Bankruptcy Court denied plaintiffs’ motion to preliminarily enjoin the Merger. On August 29, 2018, the Court denied in part defendants' motion for summary judgment, and fully denied plaintiffs' cross-motion for summary judgment. A bench trial is presently scheduled for March 2019. 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 Department of Justice (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 Civil Investigative Demand 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 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 (including certain 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, 2018 , the remaining lease payments through 2035 guaranteeing the principal and interest on these bonds are $588 million and the current carrying amount of the associated operating lease liability in the accompanying consolidated balance sheet is $321 million . As of December 31, 2018 , American had issued guarantees covering AAG’s $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 credit card 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. These credit card processing companies are not currently entitled to maintain any holdbacks pursuant to these requirements. (h) Labor Negotiations As of December 31, 2018 , American employed approximately 102,900 active full-time equivalent employees. Approximately 84% of employees are covered by collective bargaining agreements (CBAs) with various labor unions and approximately 24% of employees are covered by CBAs that will become amendable within one year. Negotiations are continuing for joint collective bargaining agreements (JCBAs) covering American’s maintenance, fleet service, stock clerks, maintenance control technicians and maintenance training instructors. Additionally, the post-Merger JCBAs covering American’s pilots and flight attendants, while not yet amendable, provide the unions with the right to elect to commence negotiations for new collective bargaining agreements in advance of each JCBA’s amendable date. Each of the unions has exercised these rights and negotiations are underway for new agreements as described in Part I, Item 1. Business - “ Employees and Labor Relations ”. There is no assurance that a successful or timely resolution of these labor negotiations will be achieved.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2018
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, 2018 2017 2016 Non-cash investing and financing activities: Equity investment $ — $ 120 $ — Settlement of bankruptcy obligations — 15 3 Supplemental information: Interest paid, net 1,091 1,040 964 Income taxes paid 18 20 16
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, 2018 2017 2016 Non-cash investing and financing activities: Equity investment $ — $ 120 $ — Settlement of bankruptcy obligations — 15 3 Supplemental information: Interest paid, net 1,009 942 867 Income taxes paid 16 18 14

Operating Segments and Related

Operating Segments and Related Disclosures	12 Months Ended
	Dec. 31, 2018
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. See Note 1(k) for our passenger revenues by geographic region. 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. See Note 1(k) for American’s passenger revenues by geographic region. 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, 2018
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, 2018 , 2017 and 2016 included $88 million , $90 million and $102 million , respectively, of share-based compensation costs. During 2018 , 2017 and 2016 , we withheld approximately 0.8 million , 1.1 million and 1.4 million shares of AAG common stock, respectively, and paid approximately $37 million , $51 million and $56 million , respectively, in satisfaction of certain tax withholding obligations associated with employee equity awards. 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 AAG 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, 2018 , 2017 and 2016 is as follows: Number of Shares Weighted Average Grant Date Fair Value (In thousands) 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 Granted 2,194 47.65 Vested and released (1,999 ) 44.99 Forfeited (199 ) 45.72 Outstanding at December 31, 2018 4,320 $ 44.29 As of December 31, 2018 , there was $111 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, 2018 , 2017 and 2016 was $91 million , $123 million and $107 million , respectively.
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, 2018 , 2017 and 2016 included $88 million , $90 million and $102 million , respectively, of share-based compensation costs. During 2018 , 2017 and 2016 , AAG withheld approximately 0.8 million , 1.1 million and 1.4 million shares of AAG common stock, respectively, and paid approximately $37 million , $51 million and $56 million , respectively, in satisfaction of certain tax withholding obligations associated with employee equity awards. 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 AAG 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, 2018 , 2017 and 2016 is as follows: Number of Shares Weighted Average Grant Date Fair Value (In thousands) 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 Granted 2,194 47.65 Vested and released (1,999 ) 44.99 Forfeited (199 ) 45.72 Outstanding at December 31, 2018 4,320 $ 44.29 As of December 31, 2018 , there was $111 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, 2018 , 2017 and 2016 was $91 million , $123 million and $107 million , respectively.

Valuation and Qualifying Accoun

Valuation and Qualifying Accounts	12 Months Ended
	Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation and Qualifying Accounts	Valuation and Qualifying Accounts (in millions) Balance at Beginning of Year Additions Charged to Statement of Operations Accounts Deductions Balance at End of Year Allowance for obsolescence of spare parts Year ended December 31, 2018 $ 769 $ 70 $ (25 ) $ 814 Year ended December 31, 2017 765 29 (25 ) 769 Year ended December 31, 2016 728 37 — 765 Allowance for uncollectible accounts Year ended December 31, 2018 $ 24 $ 42 $ (37 ) $ 29 Year ended December 31, 2017 36 43 (55 ) 24 Year ended December 31, 2016 41 47 (52 ) 36
American Airlines, Inc. [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation and Qualifying Accounts	Valuation and Qualifying Accounts (in millions) Balance at Beginning of Year Additions Charged to Statement of Operations Accounts Deductions Balance at End of Year Allowance for obsolescence of spare parts Year ended December 31, 2018 $ 717 $ 57 $ (20 ) $ 754 Year ended December 31, 2017 720 18 (21 ) 717 Year ended December 31, 2016 689 28 3 720 Allowance for uncollectible accounts Year ended December 31, 2018 $ 21 $ 39 $ (36 ) $ 24 Year ended December 31, 2017 35 41 (55 ) 21 Year ended December 31, 2016 37 47 (49 ) 35

Quarterly Financial Data (Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2018
Selected Quarterly Financial Information [Line Items]
Quarterly Financial Data (Unaudited)	Quarterly Financial Data (Unaudited) Unaudited summarized financial data by quarter for 2018 and 2017 (in millions, except share and per share amounts): First Quarter Second Quarter Third Quarter Fourth Quarter 2018 (1) Operating revenues $ 10,401 $ 11,643 $ 11,559 $ 10,938 Operating expenses 10,005 10,639 10,874 10,367 Operating income 396 1,004 685 571 Net income 159 556 372 325 Earnings per share: Basic $ 0.34 $ 1.20 $ 0.81 $ 0.71 Diluted $ 0.34 $ 1.20 $ 0.81 $ 0.70 Shares used for computation (in thousands): Basic 472,297 463,533 460,526 460,589 Diluted 474,598 464,618 461,507 461,915 2017 Operating revenues $ 9,820 $ 11,227 $ 10,965 $ 10,611 Operating expenses 9,083 9,628 9,709 9,973 Operating income 737 1,599 1,256 638 Net income (loss) 340 864 661 (583 ) Earnings (loss) per share: Basic $ 0.67 $ 1.76 $ 1.36 $ (1.22 ) Diluted $ 0.67 $ 1.75 $ 1.36 $ (1.22 ) Shares used for computation (in thousands): Basic 503,902 490,818 484,772 477,165 Diluted 507,797 492,965 486,625 477,165 (1) In the fourth quarter of 2018, we adopted the New Lease Standard as of January 1, 2018. In accordance with the New Lease Standard, prior 2018 periods have been recast to reflect the effects of this adoption. See Note 1(b) and Note 6 for further discussion of the New Lease Standard. Our fourth quarter 2018 results include $225 million of total net special items that principally included $146 million of fleet restructuring expenses, $81 million of merger integration expenses, $37 million of severance costs associated with reductions of management and support staff team members, $22 million of mark-to-market net unrealized losses associated with certain equity investments, offset in part by a $37 million net credit resulting from mark-to-market adjustments on bankruptcy obligations and a $22 million income tax credit as a result of the reversal of the valuation allowance previously recognized in the first quarter of 2018 related to our estimated refund for AMT credits, which is no longer subject to sequestration. Our fourth quarter 2017 results include $1.1 billion of total net special items that principally included a $149 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 mark-to-market adjustments on bankruptcy obligations and an $823 million special non-cash charge to reflect the impact of lower corporate income tax rates on our deferred tax asset and liabilities due to the 2017 Tax Act, which reduced the federal corporate income tax rate from 35% to 21%.
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 2018 and 2017 (in millions): First Quarter Second Quarter Third Quarter Fourth Quarter 2018 (1) Operating revenues $ 10,398 $ 11,640 $ 11,556 $ 10,936 Operating expenses 9,986 10,626 10,850 10,344 Operating income 412 1,014 706 592 Net income 209 609 433 407 2017 Operating revenues $ 9,817 $ 11,224 $ 10,962 $ 10,607 Operating expenses 9,077 9,633 9,713 9,982 Operating income 740 1,591 1,249 625 Net income (loss) 369 888 686 (658 ) (1) In the fourth quarter of 2018, American adopted the New Lease Standard as of January 1, 2018. In accordance with the New Lease Standard, prior 2018 periods have been recast to reflect the effects of this adoption. See Note 1(b) and Note 4 for further discussion of the New Lease Standard. American’s fourth quarter 2018 results include $220 million of total net special items that principally included $146 million of fleet restructuring expenses, $81 million of merger integration expenses, $37 million of severance costs associated with reductions of management and support staff team members, $22 million of mark-to-market net unrealized losses associated with certain equity investments, offset in part by a $37 million net credit resulting from mark-to-market adjustments on bankruptcy obligations and a $22 million income tax credit as a result of the reversal of the valuation allowance previously recognized in the first quarter of 2018 related to American’s estimated refund for AMT credits, which is no longer subject to sequestration. American’s fourth quarter 2017 results include $1.2 billion 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 mark-to-market adjustments on bankruptcy obligations and a $924 million special non-cash charge to reflect the impact of lower corporate income tax rates on the Company’s deferred tax asset and liabilities due to the 2017 Tax Act, which reduced the federal corporate income tax rate from 35% to 21%.

Transactions with Related Parti

Transactions with Related Parties	12 Months Ended
	Dec. 31, 2018
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, 2018 2017 AAG (1) $ 12,808 $ 10,968 AAG’s wholly-owned subsidiaries (2) (2,142 ) (2,146 ) Total $ 10,666 $ 8,822 (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 2018 , 2017 and 2016 , American recognized expense of approximately $1.8 billion , $1.7 billion and $1.5 billion , respectively, related to wholly-owned regional airline capacity purchase agreements.

Subsequent Event

Subsequent Event	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event Dividend Declaration In January 2019 , we announced that our Board of Directors declared a $0.10 per share cash dividend for stockholders of record on February 6, 2019 , and payable on February 20, 2019 . 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 or discontinued at any time at our discretion and without prior notice.

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
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), PSA Airlines, Inc. (PSA) and Piedmont Airlines, Inc. (Piedmont) 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. 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, as well as pension and retiree medical and other postretirement benefits.
Recent Accounting Pronouncements	(b) Recent Accounting Pronouncements Standards Adopted in 2018 Effective January 1, 2018, we adopted the accounting pronouncements described below. 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 adopted the New Revenue Standard using the full retrospective method, which resulted in the recast of prior reporting periods. The adoption of the New Revenue Standard impacted our accounting for outstanding mileage credits earned through travel by AAdvantage loyalty program members. There was no change in accounting for sales of mileage credits to co-branded credit card or other partners. Prior to the adoption of the New Revenue Standard, 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. The New Revenue Standard required 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 also required 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 required a gross presentation on the face of our consolidated statements of operations for certain revenues and expenses that had previously been presented on a net basis. See “Impacts to 2017 Results” and “Impacts to 2016 Results” below for the impact to our consolidated statements of operations data for 2017 and 2016, respectively, and our consolidated balance sheet as of December 31, 2017 related to the adoption of the New Revenue Standard. 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 required 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 was applied retrospectively, which resulted in the recast of each prior reporting period presented. The adoption of the New Retirement Standard had no impact on pre-tax income or net income reported. See “Impacts to 2017 Results” and “Impacts to 2016 Results” below for the impact to our consolidated statements of operations data for 2017 and 2016, respectively, related to the adoption of the New Retirement Standard. 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 (ROU) asset on the balance sheet for operating leases. Accounting for finance leases is substantially unchanged. 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. In the fourth quarter of 2018, we elected to early adopt the New Lease Standard as of January 1, 2018 using a modified retrospective transition, with the cumulative-effect adjustment to the opening balance of retained earnings as of the effective date (the effective date method). Under the effective date method, financial results reported in periods prior to 2018 are unchanged. We also elected the package of practical expedients, which among other things, does not require reassessment of lease classification. The adoption of the New Lease Standard had a significant impact on our consolidated balance sheet due to the recognition of approximately $10 billion of lease liabilities with corresponding right-of-use assets for operating leases. Additionally, we recognized a $197 million cumulative effect adjustment credit, net of tax, to retained earnings. The adjustment to retained earnings was driven principally by sale-leaseback transactions including the recognition of unamortized deferred aircraft sale-leaseback gains. Prior to the adoption of the New Lease Standard, gains on sale-leaseback transactions were generally deferred and recognized in the income statement over the lease term. Under the New Lease Standard, gains on sale-leaseback transactions (subject to adjustment for off-market terms) are recognized immediately. ASU 2016-01: Financial Instruments - Overall (Subtopic 825-10) This ASU made several modifications to Subtopic 825-10, including the elimination of the available-for-sale classification of equity investments, and it required equity investments with readily determinable fair values to be measured at fair value with changes in fair value recognized in net income. This standard was adopted prospectively as of January 1, 2018 and resulted in a $60 million cumulative effect adjustment credit to retained earnings, net of tax, related to our investment in China Southern Airlines Company Limited (China Southern Airlines), which was previously accounted for under the cost method. ASU 2016-18: Statement of Cash Flows (Topic 230): Restricted Cash This ASU required that the change in the total cash balance, cash at the beginning of the period and cash at the end of the period on the statement of cash flows include restricted cash, and also required companies that report cash and restricted cash separately on the balance sheet to reconcile those amounts to the statement of cash flows. This standard was applied retrospectively, which resulted in the recast of prior reporting periods in the statement of cash flows. For the years ended December 31, 2018 , 2017 and 2016 , $11 million , $103 million and $113 million , respectively, of restricted cash is included in the total cash and restricted cash balance at the end of the period. A reconciliation of cash and restricted cash reported on our consolidated statements of cash flows to the amounts reported on our consolidated balance sheets is provided in a table below the Consolidated Statements of Cash Flows . Impacts to 2017 Results The effects of the adoption of the New Revenue Standard and New Retirement Standard to our consolidated statement of operations for the twelve months ended December 31, 2017 were as follows (in millions): New Revenue Standard New Retirement Standard Year Ended As Reported Deferred Revenue Method Ancillary Revenue Reclassifications Gross Versus Net Presentation Reclassifications As Recast Operating revenues: Passenger $ 36,133 $ 311 $ 2,648 $ 39 $ — $ 39,131 Cargo 800 — 42 48 — 890 Other 5,274 — (2,690 ) 17 — 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 $823 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 effects of the adoption of the New Revenue Standard to our December 31, 2017 consolidated balance sheet were as follows (in millions): 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 2,791 330 3,121 Noncurrent loyalty program liability — 5,701 5,701 Total stockholders’ equity (deficit) 3,926 (4,706 ) (780 ) Impacts to 2016 Results The effects of the adoption of the New Revenue Standard and New Retirement Standard to our consolidated statement of operations for the twelve months ended December 31, 2016 were as follows (in millions): New Revenue Standard New Retirement Standard Year Ended As Reported Deferred Revenue Method Ancillary Revenue Reclassifications Gross Versus Net Presentation Reclassifications As Recast Operating revenues: Passenger $ 34,579 $ (147 ) $ 2,571 $ 42 $ — $ 37,045 Cargo 700 — 36 49 — 785 Other 4,901 — (2,607 ) 18 — 2,312 Total operating revenues 40,180 (147 ) — 109 — 40,142 Total operating expenses 34,896 — — 109 77 35,082 Operating income 5,284 (147 ) — — (77 ) 5,060 Total nonoperating expense, net (985 ) — — — 77 (908 ) Income before income taxes 4,299 (147 ) — — — 4,152 Income tax provision 1,623 (55 ) — — — 1,568 Net income $ 2,676 $ (92 ) $ — $ — $ — $ 2,584 Diluted earnings per common share $ 4.81 $ 4.65 Standards Effective for 2019 Reporting Periods ASU 2018-02: Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income This ASU provides financial statement preparers with an option to reclassify stranded tax effects within accumulated other comprehensive income to retained earnings due to the U.S. federal corporate income tax rate change as a result of the 2017 Tax Act. The amount of the reclassification is the difference between the amount initially charged or credited directly to other comprehensive income at the previously enacted U.S. federal corporate income tax rate that remains in accumulated other comprehensive income and the amount that would have been charged or credited directly to other comprehensive income using the newly enacted U.S. federal corporate income tax rate, excluding the effect of any valuation allowance previously charged to income from continuing operations. This standard is effective for interim and annual reporting periods beginning after December 15, 2018, and early adoption is permitted. We will adopt this standard effective January 1, 2019. The adoption of the standard may impact tax amounts stranded in accumulated other comprehensive income related to our pension and retiree medical and other postretirement benefit plans.
Short-term Investments	(c) 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 our consolidated statements of operations. Unrealized gains and losses are recorded in accumulated other comprehensive loss on our consolidated balance sheets.
Restricted Cash and Short-term Investments	(d) 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	(e) 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	(f) 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.
Leases	(g) Leases We determine if an arrangement is a lease at inception. Operating leases are included in operating lease ROU assets, current operating lease liabilities and noncurrent operating lease liabilities in our consolidated balance sheet. Finance leases are included in property and equipment, current maturities of long-term debt and finance leases and long-term debt and finance leases, net of current maturities, in our consolidated balance sheet. ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and liabilities are recognized at the lease commencement date based on the estimated present value of lease payments over the lease term. We use our estimated incremental borrowing rate, which is derived from information available at the lease commencement date , in determining the present value of lease payments. We give consideration to our recent debt issuances as well as publicly available data for instruments with similar characteristics when calculating our incremental borrowing rates. Our lease term includes options to extend the lease when it is reasonably certain that we will exercise that option. Leases with a term of 12 months or less are not recorded on the balance sheet. Our lease agreements do not contain any residual value guarantees. Under certain of our capacity purchase agreements with third-party regional carriers, we do not own the underlying aircraft. However, since we control the marketing, scheduling, ticketing, pricing and seat inventories of these aircraft and therefore control the asset, the aircraft is deemed to be leased for accounting purposes. For these capacity purchase agreements, we account for the lease and non-lease components separately. The lease component consists of the aircraft and the non-lease components consist of services, such as the crew and maintenance. We allocate the consideration in the capacity purchase agreements to the lease and non-lease components using their estimated relative standalone prices. See Note 12(b) for additional information on our capacity purchase agreements . For real estate, we account for the lease and non-lease components as a single lease component.
Income Taxes	(h) 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	(i) 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	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. 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. 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. (j) 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.
Revenue Recognition	The balance of the loyalty program liability fluctuates based on seasonal patterns, which impact the volume of mileage credits issued through travel or sold to co-branded credit card and other partners (deferral of revenue) and mileage credits redeemed (recognition of revenue). We attribute passenger revenue by geographic region based upon the origin and destination of each flight segment. Passenger Revenue We recognize all revenues generated from transportation on American and our regional flights operated under the brand name American Eagle, including associated baggage fees, ticketing change fees and other inflight services, as passenger revenue when transportation is provided. Ticket and other related sales for transportation that has not yet been provided are initially deferred and recorded as air traffic liability on our consolidated balance sheets. The air traffic liability principally represents tickets sold for future travel on American and partner airlines, as well as estimated future refunds and exchanges of tickets sold for past travel. 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 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. 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. Loyalty Revenue 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 and other participating partner airlines, as well as other non-air travel awards such as hotels and rental cars. For mileage credits earned by AAdvantage loyalty program members, we apply the deferred revenue method in accordance with the New Revenue Standard. Mileage credits earned through travel For mileage credits earned through travel, we apply a relative selling price approach whereby the total amount collected from each passenger ticket sale is allocated between the air transportation and the mileage credits earned. The portion of each passenger ticket sale attributable to mileage credits earned is initially deferred and then recognized in passenger revenue when mileage credits are redeemed and transportation is provided. The estimated selling price of mileage credits is determined using an equivalent ticket value approach, which uses historical data, including award redemption patterns by geographic region and class of service, as well as similar fares as those used to settle award redemptions. The estimated selling price of miles is adjusted for an estimate of miles that will not be redeemed based on historical redemption patterns. Mileage credits sold to co-branded credit cards and other partners We sell mileage credits to participating airline partners and non-airline business partners including our co-branded credit card partners, under contracts with terms extending generally for one to nine years. Consideration received from the sale of mileage credits is variable and payment terms typically are within 30 days subsequent to the month of mileage sale. Sales of mileage credits to non-airline business partners are comprised of two components, transportation and marketing. We allocate the consideration received from these sales of mileage credits based on the relative selling price of each product or service delivered. Our most significant partner agreements are our co-branded credit card 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 intellectual property, including the American brand and access to loyalty program member lists, which is the predominant element in the agreements, as well as advertising (collectively, the marketing component). Accordingly, we recognize the marketing component in other revenue in the period of the mileage sale following the sales-based royalty method. The transportation component represents the estimated selling price of future travel awards and is determined using the same equivalent ticket value approach described above. The portion of each mileage credit sold attributable to transportation is initially deferred and then recognized in passenger revenue when mileage credits are redeemed and transportation is provided. For the portion of our outstanding mileage credits that we estimate will not be redeemed, we recognize the associated value proportionally as the remaining mileage credits are redeemed. Our estimates are based on analysis of historical redemptions. Cargo Revenue Cargo revenue is recognized when we provide the transportation. Other Revenue Other revenue includes revenue associated with our loyalty program, which is comprised principally of the marketing component of mileage sales to co-branded credit card and other partners and other marketing related payments. For the years ended December 31, 2018 , 2017 and 2016 , loyalty revenue included in other revenue was $2.4 billion , $2.1 billion and $1.9 billion , respectively. The accounting and recognition for the loyalty program marketing services are discussed above in “ Loyalty Revenue .” The remaining amounts included within other revenue relate to airport clubs, advertising and vacation-related services. Contract Balances Our significant contract liabilities are comprised of (1) outstanding loyalty program mileage credits that may be redeemed for future travel and other non-air travel awards, reported as loyalty program liability on our consolidated balance sheet and (2) ticket sales for transportation that has not yet been provided, reported as air traffic liability on our consolidated balance sheet. The air traffic liability principally represents tickets sold for future travel on American and partner airlines, as well as estimated future refunds and exchanges of tickets sold for past travel. The balance in our air traffic liability also fluctuates with seasonal travel patterns. The contract duration of passenger tickets is one year . Accordingly, any revenue associated with tickets sold for future travel will be recognized within twelve months. For 2018 , $3.1 billion of revenue was recognized in passenger revenue that was included in our air traffic liability at December 31, 2017 . With respect to contract receivables, reflected as accounts receivable, net on the accompanying consolidated balance sheet, these primarily include receivables for tickets sold to individual passengers through the use of major credit cards. 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. (k) Revenue Recognition Revenue Effective January 1, 2018, we adopted the New Revenue Standard using the full retrospective method, which resulted in the recast of prior reporting periods. Refer to “ Recent Accounting Pronouncements” in Note 1(b) for the effects of the adoption on our consolidated statements of operations for the years ended December 31, 2017 and 2016 and on our consolidated balance sheet as of December 31, 2017 . Under the New Revenue Standard, revenue is recognized upon the transfer of control of promised products or services to our customers in an amount that reflects the consideration we expect to receive in exchange for those products or services .
Maintenance, Materials and Repairs	(l) 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	(m) Selling Expenses Selling expenses include credit card fees, commissions, computerized reservations systems fees and advertising. Advertising costs are expensed as incurred.
Share-based Compensation	(n) 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 AAG common stock on the date of grant. See Note 15 for further discussion of share-based compensation.
Foreign Currency Gains and Losses	(o) Foreign Currency Gains and Losses Foreign currency gains and losses are recorded as part of other income, net within total 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 our consolidated statements of operations.
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. 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, as well as pension and retiree medical and other postretirement benefits.
Recent Accounting Pronouncements	(b) Recent Accounting Pronouncements Standards Adopted in 2018 Effective January 1, 2018, American adopted the accounting pronouncements described below. 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 adopted the New Revenue Standard using the full retrospective method, which resulted in the recast of prior reporting periods. The adoption of the New Revenue Standard impacted American’s accounting for outstanding mileage credits earned through travel by AAdvantage loyalty program members. There was no change in accounting for sales of mileage credits to co-branded credit card or other partners. Prior to the adoption of the New Revenue Standard, 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. The New Revenue Standard required 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 also required 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 required a gross presentation on the face of American’s consolidated statements of operations for certain revenues and expenses that had previously been presented on a net basis. See “Impacts to 2017 Results” and “Impacts to 2016 Results” below for the impact to American’s consolidated statements of operations data for 2017 and 2016, respectively, and American’s consolidated balance sheet as of December 31, 2017 related to the adoption of the New Revenue Standard. 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 required 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 was applied retrospectively, which resulted in the recast of each prior reporting period presented. The adoption of the New Retirement Standard had no impact on pre-tax income or net income reported. See “ Impacts to 2017 Results ” and “ Impacts to 2016 Results ” below for the impact to American’s consolidated statements of operations data for 2017 and 2016, respectively, related to the adoption of the New Retirement Standard. 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 (ROU) asset on the balance sheet for operating leases. Accounting for finance leases is substantially unchanged. 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. In the fourth quarter of 2018, American elected to early adopt the New Lease Standard as of January 1, 2018 using a modified retrospective transition, with the cumulative-effect adjustment to the opening balance of retained earnings as of the effective date (the effective date method). Under the effective date method, financial results reported in periods prior to 2018 are unchanged. American also elected the package of practical expedients, which among other things, does not require reassessment of lease classification. The adoption of the New Lease Standard had a significant impact on American’s consolidated balance sheet due to the recognition of approximately $10 billion of lease liabilities with corresponding right-of-use assets for operating leases. Additionally, American recognized a $197 million cumulative effect adjustment credit, net of tax, to retained earnings. The adjustment to retained earnings was driven principally by sale-leaseback transactions including the recognition of unamortized deferred aircraft sale-leaseback gains. Prior to the adoption of the New Lease Standard, gains on sale-leaseback transactions were generally deferred and recognized in the income statement over the lease term. Under the New Lease Standard, gains on sale-leaseback transactions (subject to adjustment for off-market terms) are recognized immediately. ASU 2016-01: Financial Instruments - Overall (Subtopic 825-10) This ASU made several modifications to Subtopic 825-10, including the elimination of the available-for-sale classification of equity investments, and it required equity investments with readily determinable fair values to be measured at fair value with changes in fair value recognized in net income. This standard was adopted prospectively as of January 1, 2018 and resulted in a $60 million cumulative effect adjustment credit to retained earnings, net of tax, related to American's investment in China Southern Airlines Company Limited (China Southern Airlines), which was previously accounted for under the cost method. ASU 2016-18: Statement of Cash Flows (Topic 230): Restricted Cash This ASU required that the change in the total cash balance, cash at the beginning of the period and cash at the end of the period on the statement of cash flows include restricted cash, and also required companies that report cash and restricted cash separately on the balance sheet to reconcile those amounts to the statement of cash flows. This standard was applied retrospectively, which resulted in the recast of prior reporting periods in the statement of cash flows. For the years ended December 31, 2018 , 2017 and 2016 , $11 million , $103 million and $113 million , respectively, of restricted cash is included in the total cash and restricted cash balance at the end of the period. A reconciliation of cash and restricted cash reported on American's consolidated statements of cash flows to the amounts reported on its consolidated balance sheets is provided in a table below the Consolidated Statements of Cash Flows. Impacts to 2017 Results The effects of the adoption of the New Revenue Standard and New Retirement Standard to American’s consolidated statement of operations for the twelve months ended December 31, 2017 were as follows (in millions): New Revenue Standard New Retirement Standard Year Ended As Reported Deferred Revenue Method Ancillary Revenue Reclassifications Gross Versus Net Presentation Reclassifications As Recast Operating revenues: Passenger $ 36,133 $ 311 $ 2,648 $ 39 $ — $ 39,131 Cargo 800 — 42 48 — 890 Other 5,262 — (2,690 ) 17 — 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 a $924 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 effects of the adoption of the New Revenue Standard to American’s December 31, 2017 consolidated balance sheet were as follows (in millions): 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 2,791 330 3,121 Noncurrent loyalty program liability — 5,701 5,701 Total stockholders’ equity (deficit) 14,594 (4,706 ) 9,888 Impacts to 2016 Results The effects of the adoption of the New Revenue Standard and New Retirement Standard to American’s consolidated statement of operations for the twelve months ended December 31, 2016 were as follows (in millions): New Revenue Standard New Retirement Standard Year Ended As Reported Deferred Revenue Method Ancillary Revenue Reclassifications Gross Versus Net Presentation Reclassifications As Recast Operating revenues: Passenger $ 34,579 $ (147 ) $ 2,571 $ 42 $ — $ 37,045 Cargo 700 — 36 49 — 785 Other 4,884 — (2,607 ) 18 — 2,295 Total operating revenues 40,163 (147 ) — 109 — 40,125 Total operating expenses 34,859 — — 109 77 35,045 Operating income 5,304 (147 ) — — (77 ) 5,080 Total nonoperating expense, net (861 ) — — — 77 (784 ) Income before income taxes 4,443 (147 ) — — — 4,296 Income tax provision 1,662 (55 ) — — — 1,607 Net income $ 2,781 $ (92 ) $ — $ — $ — $ 2,689 Standards Effective for 2019 Reporting Periods ASU 2018-02: Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income This ASU provides financial statement preparers with an option to reclassify stranded tax effects within accumulated other comprehensive income to retained earnings due to the U.S. federal corporate income tax rate change as a result of the 2017 Tax Act. The amount of the reclassification is the difference between the amount initially charged or credited directly to other comprehensive income at the previously enacted U.S. federal corporate income tax rate that remains in accumulated other comprehensive income and the amount that would have been charged or credited directly to other comprehensive income using the newly enacted U.S. federal corporate income tax rate, excluding the effect of any valuation allowance previously charged to income from continuing operations. This standard is effective for interim and annual reporting periods beginning after December 15, 2018, and early adoption is permitted. American will adopt this standard effective January 1, 2019. The adoption of the standard may impact tax amounts stranded in accumulated other comprehensive income related to American's pension and retiree medical and other postretirement benefit plans.
Short-term Investments	(c) 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 American’s consolidated statements of operations. Unrealized gains and losses are recorded in accumulated other comprehensive loss on American’s consolidated balance sheets.
Restricted Cash and Short-term Investments	(d) 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	(e) 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	(f) 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.
Leases	(g) Leases American determines if an arrangement is a lease at inception. Operating leases are included in operating lease ROU assets, current operating lease liabilities and noncurrent operating lease liabilities in American’s consolidated balance sheet. Finance leases are included in property and equipment, current maturities of long-term debt and finance leases and long-term debt and finance leases, net of current maturities, in American’s consolidated balance sheet. ROU assets represent American’s right to use an underlying asset for the lease term and lease liabilities represent its obligation to make lease payments arising from the lease. ROU assets and liabilities are recognized at the lease commencement date based on the estimated present value of lease payments over the lease term. American uses its estimated incremental borrowing rate, which is derived from information available at the lease commencement date , in determining the present value of lease payments. American gives consideration to its recent debt issuances as well as publicly available data for instruments with similar characteristics when calculating its incremental borrowing rates. American’s lease term includes options to extend the lease when it is reasonably certain that it will exercise that option. Leases with a term of 12 months or less are not recorded on the balance sheet. American’s lease agreements do not contain any residual value guarantees. Under certain of American’s capacity purchase agreements with third-party regional carriers, American does not own the underlying aircraft. However, since American controls the marketing, scheduling, ticketing, pricing and seat inventories of these aircraft and therefore control the asset, the aircraft is deemed to be leased for accounting purposes. For these capacity purchase agreements, American accounts for the lease and non-lease components separately. The lease component consists of the aircraft and the non-lease components consist of services, such as the crew and maintenance. American allocates the consideration in the capacity purchase agreements to the lease and non-lease components using their estimated relative standalone prices. See Note 10(b) for additional information on its capacity purchase agreements . For real estate, American accounts for the lease and non-lease components as a single lease component.
Income Taxes	(h) 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	(i) 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.
Other Intangibles, Net	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. 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. 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. (j) 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.
Revenue Recognition	The balance of the loyalty program liability fluctuates based on seasonal patterns, which impact the volume of mileage credits issued through travel or sold to co-branded credit card and other partners (deferral of revenue) and mileage credits redeemed (recognition of revenue). American attributes passenger revenue by geographic region based upon the origin and destination of each flight segment. Passenger Revenue American recognizes all revenues generated from transportation on American and its regional flights operated under the brand name American Eagle, including associated baggage fees, ticketing change fees and other inflight services, as passenger revenue when transportation is provided. Ticket and other related sales for transportation that has not yet been provided are initially deferred and recorded as air traffic liability on American’s consolidated balance sheets. The air traffic liability principally represents tickets sold for future travel on American and partner airlines, as well as estimated future refunds and exchanges of tickets sold for past travel. 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 has 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. 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. Loyalty Revenue 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 and other participating partner airlines, as well as other non-air travel awards such as hotels and rental cars. For mileage credits earned by AAdvantage loyalty program members, American applies the deferred revenue method in accordance with the New Revenue Standard. Mileage credits earned through travel For mileage credits earned through travel, American applies a relative selling price approach whereby the total amount collected from each passenger ticket sale is allocated between the air transportation and the mileage credits earned. The portion of each passenger ticket sale attributable to mileage credits earned is initially deferred and then recognized in passenger revenue when mileage credits are redeemed and transportation is provided. The estimated selling price of mileage credits is determined using an equivalent ticket value approach, which uses historical data, including award redemption patterns by geographic region and class of service, as well as similar fares as those used to settle award redemptions. The estimated selling price of miles is adjusted for an estimate of miles that will not be redeemed based on historical redemption patterns. Mileage credits sold to co-branded credit cards and other partners American sells mileage credits to participating airline partners and non-airline business partners including American’s co-branded credit card partners, under contracts with terms extending generally for one to nine years . Consideration received from the sale of mileage credits is variable and payment terms typically are within 30 days subsequent to the month of mileage sale. Sales of mileage credits to non-airline business partners are comprised of two components, transportation and marketing. American allocates the consideration received from these sales of mileage credits based on the relative selling price of each product or service delivered. American’s most significant partner agreements are its co-branded credit card agreements with Citi and Barclaycard US that American entered into in 2016. American identified the following revenue elements in these co-branded credit card agreements: the transportation component; and the use of intellectual property, including the American brand and access to loyalty program member lists, which is the predominant element in the agreements, as well as advertising (collectively, the marketing component). Accordingly, American recognizes the marketing component in other revenue in the period of the mileage sale following the sales-based royalty method. The transportation component represents the estimated selling price of future travel awards and is determined using the same equivalent ticket value approach described above. The portion of each mileage credit sold attributable to transportation is initially deferred and then recognized in passenger revenue when mileage credits are redeemed and transportation is provided. For the portion of American’s outstanding mileage credits that it estimates will not be redeemed, American recognizes the associated value proportionally as the remaining mileage credits are redeemed. American’s estimates are based on analysis of historical redemptions. Cargo Revenue Cargo revenue is recognized when American provides the transportation. Other Revenue Other revenue includes revenue associated with American’s loyalty program, which is comprised principally of the marketing component of mileage sales to co-branded credit card and other partners and other marketing related payments. For the years ended December 31, 2018 , 2017 and 2016 , loyalty revenue included in other revenue was $2.4 billion , $2.1 billion and $1.9 billion , respectively. The accounting and recognition for the loyalty program marketing services are discussed above in “ Loyalty Revenue .” The remaining amounts included within other revenue relate to airport clubs, advertising and vacation-related services. Contract Balances American’s significant contract liabilities are comprised of (1) outstanding loyalty program mileage credits that may be redeemed for future travel and other non-air travel awards, reported as loyalty program liability on American’s consolidated balance sheet and (2) ticket sales for transportation that has not yet been provided, reported as air traffic liability on American’s consolidated balance sheet. (k) Revenue Recognition Revenue Effective January 1, 2018, American adopted the New Revenue Standard using the full retrospective method, which resulted in the recast of prior reporting periods. Refer to “ Recent Accounting Pronouncements” in Note 1(b) for the effects of the adoption on American’s consolidated statements of operations for the years ended December 31, 2017 and 2016 and on American’s consolidated balance sheet as of December 31, 2017 . Under the New Revenue Standard, revenue is recognized upon the transfer of control of promised products or services to American’s customers in an amount that reflects the consideration it expects to receive in exchange for those products or services . The air traffic liability principally represents tickets sold for future travel on American and partner airlines, as well as estimated future refunds and exchanges of tickets sold for past travel. The balance in American’s air traffic liability also fluctuates with seasonal travel patterns. The contract duration of passenger tickets is one year . Accordingly, any revenue associated with tickets sold for future travel will be recognized within twelve months. For 2018 , $3.1 billion of revenue was recognized in passenger revenue that was included in American’s air traffic liability at December 31, 2017 . With respect to contract receivables, reflected as accounts receivable, net on the accompanying consolidated balance sheet, these primarily include receivables for tickets sold to individual passengers through the use of major credit cards. 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.
Maintenance, Materials and Repairs	(l) 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	(m) Selling Expenses Selling expenses include credit card fees, commissions, computerized reservations systems fees and advertising. Advertising costs are expensed as incurred.
Share-based Compensation	(n) 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 AAG common stock on the date of grant. See Note 13 for further discussion of share-based compensation.
Foreign Currency Gains and Losses	(o) Foreign Currency Gains and Losses Foreign currency gains and losses are recorded as part of other income, net within total 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 American’s consolidated statements of operations.

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	Impacts to 2017 Results The effects of the adoption of the New Revenue Standard and New Retirement Standard to our consolidated statement of operations for the twelve months ended December 31, 2017 were as follows (in millions): New Revenue Standard New Retirement Standard Year Ended As Reported Deferred Revenue Method Ancillary Revenue Reclassifications Gross Versus Net Presentation Reclassifications As Recast Operating revenues: Passenger $ 36,133 $ 311 $ 2,648 $ 39 $ — $ 39,131 Cargo 800 — 42 48 — 890 Other 5,274 — (2,690 ) 17 — 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 $823 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 effects of the adoption of the New Revenue Standard to our December 31, 2017 consolidated balance sheet were as follows (in millions): 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 2,791 330 3,121 Noncurrent loyalty program liability — 5,701 5,701 Total stockholders’ equity (deficit) 3,926 (4,706 ) (780 ) Impacts to 2016 Results The effects of the adoption of the New Revenue Standard and New Retirement Standard to our consolidated statement of operations for the twelve months ended December 31, 2016 were as follows (in millions): New Revenue Standard New Retirement Standard Year Ended As Reported Deferred Revenue Method Ancillary Revenue Reclassifications Gross Versus Net Presentation Reclassifications As Recast Operating revenues: Passenger $ 34,579 $ (147 ) $ 2,571 $ 42 $ — $ 37,045 Cargo 700 — 36 49 — 785 Other 4,901 — (2,607 ) 18 — 2,312 Total operating revenues 40,180 (147 ) — 109 — 40,142 Total operating expenses 34,896 — — 109 77 35,082 Operating income 5,284 (147 ) — — (77 ) 5,060 Total nonoperating expense, net (985 ) — — — 77 (908 ) Income before income taxes 4,299 (147 ) — — — 4,152 Income tax provision 1,623 (55 ) — — — 1,568 Net income $ 2,676 $ (92 ) $ — $ — $ — $ 2,584 Diluted earnings per common share $ 4.81 $ 4.65
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, 2018 and 2017 (in millions): December 31, 2018 2017 Domestic airport slots $ 365 $ 365 Customer relationships 300 300 Marketing agreements 105 105 Tradenames 35 35 Airport gate leasehold rights 137 137 Accumulated amortization (663 ) (622 ) Total $ 279 $ 320
Schedule of Future Amortization Expense	We expect to record annual amortization expense for these intangible assets as follows (in millions): 2019 $ 41 2020 41 2021 41 2022 41 2023 7 2024 and thereafter 108 Total $ 279
Disaggregation of Revenue	The following are the significant categories comprising our reported operating revenues (in millions): 2018 2017 2016 Passenger revenue: Passenger travel $ 37,457 $ 36,152 $ 34,278 Loyalty revenue - travel (1) 3,219 2,979 2,767 Total passenger revenue 40,676 39,131 37,045 Cargo 1,013 890 785 Other: Loyalty revenue - marketing services 2,352 2,124 1,872 Other revenue 500 477 440 Total other revenue 2,852 2,601 2,312 Total operating revenues $ 44,541 $ 42,622 $ 40,142 (1) Loyalty revenue included in passenger revenue is principally comprised of mileage credit redemptions earned through travel and mileage credits sold to co-branded credit card and other partners. See “ Loyalty Revenue ” below for further discussion on these mileage credits. The following is our total passenger revenue by geographic region (in millions): 2018 2017 2016 Domestic $ 29,573 $ 28,749 $ 27,202 Latin America 5,125 4,840 4,676 Atlantic 4,376 4,028 3,873 Pacific 1,602 1,514 1,294 Total passenger revenue $ 40,676 $ 39,131 $ 37,045
Schedule of Contract Balances	Changes in loyalty program liability are as follows (in millions): Balance at December 31, 2017 $ 8,822 Deferral of revenue 3,083 Recognition of revenue (1) (3,366 ) Balance at December 31, 2018 (2) $ 8,539 (1) Principally relates to revenue recognized from the redemption of mileage credits for both air and non-air travel awards. Mileage credits are combined in one homogenous pool and are not separately identifiable. As such, the revenue is comprised of miles that were part of the loyalty program deferred revenue balance at the beginning of the period, as well as miles that were issued during the period. (2) Mileage credits can be redeemed at any time and do not expire as long as that AAdvantage member has any type of qualifying activity at least every 18 months . As of December 31, 2018 , our current loyalty program liability was $3.3 billion and represents our current estimate of revenue expected to be recognized in the next twelve months based on historical trends, with the balance reflected in long-term loyalty program liability expected to be recognized as revenue in periods thereafter. December 31, 2018 December 31, 2017 (in millions) Loyalty program liability $ 8,539 $ 8,822 Air traffic liability 4,339 4,042 Total $ 12,878 $ 12,864
Components of Regional Expenses	Regional expenses consist of the following (in millions): Year Ended December 31, 2018 2017 2016 Aircraft fuel and related taxes $ 1,843 $ 1,382 $ 1,109 Salaries, wages and benefits 1,591 1,452 1,333 Capacity purchases from third-party regional carriers (1) 1,431 1,581 1,538 Maintenance, materials and repairs 340 281 345 Other rent and landing fees 610 625 564 Aircraft rent 32 35 36 Selling expenses 369 361 347 Depreciation and amortization 318 315 301 Special items, net 6 22 14 Other 593 492 457 Total regional expenses $ 7,133 $ 6,546 $ 6,044 (1) In 2018 , we recognized $565 million of expense under our capacity purchase agreement with Republic Airline Inc. (Republic). We hold a 25% equity interest in Republic Airways Holdings Inc. (Republic Holdings), the parent company of Republic.
American Airlines, Inc. [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	Impacts to 2017 Results The effects of the adoption of the New Revenue Standard and New Retirement Standard to American’s consolidated statement of operations for the twelve months ended December 31, 2017 were as follows (in millions): New Revenue Standard New Retirement Standard Year Ended As Reported Deferred Revenue Method Ancillary Revenue Reclassifications Gross Versus Net Presentation Reclassifications As Recast Operating revenues: Passenger $ 36,133 $ 311 $ 2,648 $ 39 $ — $ 39,131 Cargo 800 — 42 48 — 890 Other 5,262 — (2,690 ) 17 — 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 a $924 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 effects of the adoption of the New Revenue Standard to American’s December 31, 2017 consolidated balance sheet were as follows (in millions): 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 2,791 330 3,121 Noncurrent loyalty program liability — 5,701 5,701 Total stockholders’ equity (deficit) 14,594 (4,706 ) 9,888 Impacts to 2016 Results The effects of the adoption of the New Revenue Standard and New Retirement Standard to American’s consolidated statement of operations for the twelve months ended December 31, 2016 were as follows (in millions): New Revenue Standard New Retirement Standard Year Ended As Reported Deferred Revenue Method Ancillary Revenue Reclassifications Gross Versus Net Presentation Reclassifications As Recast Operating revenues: Passenger $ 34,579 $ (147 ) $ 2,571 $ 42 $ — $ 37,045 Cargo 700 — 36 49 — 785 Other 4,884 — (2,607 ) 18 — 2,295 Total operating revenues 40,163 (147 ) — 109 — 40,125 Total operating expenses 34,859 — — 109 77 35,045 Operating income 5,304 (147 ) — — (77 ) 5,080 Total nonoperating expense, net (861 ) — — — 77 (784 ) Income before income taxes 4,443 (147 ) — — — 4,296 Income tax provision 1,662 (55 ) — — — 1,607 Net income $ 2,781 $ (92 ) $ — $ — $ — $ 2,689
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, 2018 and 2017 (in millions): December 31, 2018 2017 Domestic airport slots $ 365 $ 365 Customer relationships 300 300 Marketing agreements 105 105 Tradenames 35 35 Airport gate leasehold rights 137 137 Accumulated amortization (663 ) (622 ) Total $ 279 $ 320
Schedule of Future Amortization Expense	American expects to record annual amortization expense for these intangible assets as follows (in millions): 2019 $ 41 2020 41 2021 41 2022 41 2023 7 2024 and thereafter 108 Total $ 279
Disaggregation of Revenue	The following are the significant categories comprising American’s reported operating revenues (in millions): 2018 2017 2016 Passenger revenue: Passenger travel $ 37,457 $ 36,152 $ 34,278 Loyalty revenue - travel (1) 3,219 2,979 2,767 Total passenger revenue 40,676 39,131 37,045 Cargo 1,013 890 785 Other: Loyalty revenue - marketing services 2,352 2,124 1,872 Other revenue 489 465 423 Total other revenue 2,841 2,589 2,295 Total operating revenues $ 44,530 $ 42,610 $ 40,125 (1) Loyalty revenue included in passenger revenue is principally comprised of mileage credit redemptions earned through travel and mileage credits sold to co-branded credit card and other partners. See “ Loyalty Revenue” below for further discussion on these mileage credits. The following is American’s total passenger revenue by geographic region (in millions): 2018 2017 2016 Domestic $ 29,573 $ 28,749 $ 27,202 Latin America 5,125 4,840 4,676 Atlantic 4,376 4,028 3,873 Pacific 1,602 1,514 1,294 Total passenger revenue $ 40,676 $ 39,131 $ 37,045
Schedule of Contract Balances	December 31, 2018 December 31, 2017 (in millions) Loyalty program liability $ 8,539 $ 8,822 Air traffic liability 4,339 4,042 Total $ 12,878 $ 12,864 Changes in loyalty program liability are as follows (in millions): Balance at December 31, 2017 $ 8,822 Deferral of revenue 3,083 Recognition of revenue (1) (3,366 ) Balance at December 31, 2018 (2) $ 8,539 (1) Principally relates to revenue recognized from the redemption of mileage credits for both air and non-air travel awards. Mileage credits are combined in one homogenous pool and are not separately identifiable. As such, the revenue is comprised of miles that were part of the loyalty program deferred revenue balance at the beginning of the period, as well as miles that were issued during the period. (2) Mileage credits can be redeemed at any time and do not expire as long as that AAdvantage member has any type of qualifying activity at least every 18 months . As of December 31, 2018 , American’s current loyalty program liability was $3.3 billion and represents American’s current estimate of revenue expected to be recognized in the next twelve months based on historical trends, with the balance reflected in long-term loyalty program liability expected to be recognized as revenue in periods thereafter.
Components of Regional Expenses	Regional expenses consist of the following (in millions): Year Ended December 31, 2018 2017 2016 Aircraft fuel and related taxes $ 1,843 $ 1,382 $ 1,109 Salaries, wages and benefits 338 356 327 Capacity purchases from third-party regional carriers (1) 3,267 3,283 3,186 Maintenance, materials and repairs 8 7 4 Other rent and landing fees 583 602 487 Aircraft rent 27 27 28 Selling expenses 369 361 347 Depreciation and amortization 267 262 237 Special items, net — 3 13 Other 362 289 271 Total regional expenses $ 7,064 $ 6,572 $ 6,009 (1) In 2018 , American recognized $565 million of expense under its capacity purchase agreement with Republic Airline Inc. (Republic). American holds a 25% equity interest in Republic Airways Holdings Inc. (Republic Holdings), the parent company of Republic.

Special Items, Net (Tables)

Special Items, Net (Tables)	12 Months Ended
	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Components of Special Items, Net Included in Consolidated Statements of Operations	Special items, net on our consolidated statements of operations consisted of the following (in millions): Year Ended December 31, 2018 2017 2016 Fleet restructuring expenses (1) $ 422 $ 232 $ 177 Merger integration expenses (2) 268 273 514 Severance expenses (3) 58 — — Litigation settlement (4) 45 — — Intangible asset impairment (5) 26 — — Labor contract expenses 13 46 — Mark-to-market adjustments on bankruptcy obligations, net (6) (76 ) 27 25 Employee 2017 Tax Act bonus expense (7) — 123 — Other operating charges (credits), net 31 11 (7 ) Mainline operating special items, net 787 712 709 Regional operating special items, net 6 22 14 Operating special items, net 793 734 723 Mark-to-market adjustments on equity investments, net (8) 104 — — Debt refinancing and extinguishment charges 13 22 49 Other nonoperating credits, net (4 ) — — Nonoperating special items, net 113 22 49 Income tax special items (9) 18 — — Impact of the 2017 Tax Act (10) — 823 — Income tax special items, net 18 823 — (1) Fleet restructuring expenses principally included accelerated depreciation and rent expense for aircraft and related equipment grounded or expected to be grounded earlier than planned. (2) Merger integration expenses included costs associated with integration projects, principally our flight attendant, human resources and payroll, and technical operations systems. (3) Severance expenses primarily included costs associated with reductions of management and support staff team members. (4) Settlement of a private party antitrust lawsuit. See Note 12(e) - “ Private Party Antitrust Action Related to Passenger Capacity ” for further discussion. (5) Intangible asset impairment includes a non-cash charge to write-off our Brazil route authority as a result of the U.S.-Brazil open skies agreement. (6) Bankruptcy obligations that will be settled in shares of our common stock are marked-to-market based on our stock price. (7) 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. (8) Mark-to-market adjustments on equity investments relate to net unrealized losses primarily associated with our equity investments in China Southern Airlines and Mesa Air Group, Inc. (9) Income tax special items for 2018 included an $18 million charge related to an international income tax matter. (10) Impact of the 2017 Tax Act includes an $823 million non-cash charge to income tax expense to reflect the impact of lower corporate income tax rates on our deferred tax asset and liabilities resulting from the 2017 Tax Act, which reduced the federal corporate income tax rate from 35% to 21%.
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 American’s consolidated statements of operations consisted of the following (in millions): Year Ended December 31, 2018 2017 2016 Fleet restructuring expenses (1) $ 422 $ 232 $ 177 Merger integration expenses (2) 268 273 514 Severance expenses (3) 58 — — Litigation settlement (4) 45 — — Intangible asset impairment (5) 26 — — Labor contract expenses 13 46 — Mark-to-market adjustments on bankruptcy obligations, net (6) (76 ) 27 25 Employee 2017 Tax Act bonus expense (7) — 123 — Other operating charges (credits), net 31 11 (7 ) Mainline operating special items, net 787 712 709 Regional operating special items, net — 3 13 Operating special items, net 787 715 722 Mark-to-market adjustments on equity investments, net (8) 104 — — Debt refinancing and extinguishment charges 13 22 49 Other nonoperating credits, net (4 ) — — Nonoperating special items, net 113 22 49 Income tax special items (9) 18 — — Impact of the 2017 Tax Act (10) — 924 — Income tax special items, net 18 924 — (1) Fleet restructuring expenses principally included accelerated depreciation and rent expense for aircraft and related equipment grounded or expected to be grounded earlier than planned. (2) Merger integration expenses included costs associated with integration projects, principally American's flight attendant, human resources and payroll, and technical operations systems. (3) Severance expenses primarily included costs associated with reductions of management and support staff team members. (4) Settlement of a private party antitrust lawsuit. See Note 10(e) - “ Private Party Antitrust Action Related to Passenger Capacity ” for further discussion. (5) Intangible asset impairment includes a non-cash charge to write-off American’s Brazil route authority as a result of the U.S.-Brazil open skies agreement. (6) Bankruptcy obligations that will be settled in shares of AAG common stock are marked-to-market based on AAG’s stock price. (7) 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. (8) Mark-to-market adjustments on equity investments relate to net unrealized losses primarily associated with American’s equity investments in China Southern Airlines and Mesa Air Group, Inc. (9) Income tax special items for 2018 included an $18 million charge related to an international income tax matter. (10) Impact of the 2017 Tax Act includes a $924 million

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 2017 2016 Basic EPS: Net income $ 1,412 $ 1,282 $ 2,584 Weighted average common shares outstanding (in thousands) 464,236 489,164 552,308 Basic EPS $ 3.04 $ 2.62 $ 4.68 Diluted EPS: Net income for purposes of computing diluted EPS $ 1,412 $ 1,282 $ 2,584 Share computation for diluted EPS (in thousands): Basic weighted average common shares outstanding 464,236 489,164 552,308 Dilutive effect of stock awards 1,424 2,528 3,791 Diluted weighted average common shares outstanding 465,660 491,692 556,099 Diluted EPS $ 3.03 $ 2.61 $ 4.65 Restricted stock unit awards excluded from the calculation of diluted EPS because inclusion would be antidilutive (in thousands) 1,266 328 1,429

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Instrument [Line Items]
Schedule of Long-Term Debt	Long-term debt included in the consolidated balance sheets consisted of (in millions): December 31, 2018 2017 Secured 2013 Credit Facilities, variable interest rate of 4.26%, installments through 2025 (a) $ 1,825 $ 1,825 2014 Credit Facilities, variable interest rate of 4.39%, installments through 2021 (a) 1,215 728 April 2016 Credit Facilities, variable interest rate of 4.52%, installments through 2023 (a) 980 990 December 2016 Credit Facilities, variable interest rate of 4.46%, installments through 2023 (a) 1,225 1,238 Aircraft enhanced equipment trust certificates (EETCs), fixed interest rates ranging from 3.00% to 9.01%, averaging 4.21%, maturing from 2019 to 2029 (b) 11,648 11,881 Equipment loans and other notes payable, fixed and variable interest rates ranging from 2.34% to 8.48%, averaging 4.26%, maturing from 2019 to 2030 (c) 5,060 5,259 Special facility revenue bonds, fixed interest rates ranging from 5.00% to 8.00%, maturing from 2019 to 2031 798 857 Other secured obligations — 2 22,751 22,780 Unsecured 5.50% senior notes, interest only payments until due in 2019 (d) 750 750 4.625% senior notes, interest only payments until due in 2020 (d) 500 500 6.125% senior notes — 500 1,250 1,750 Total long-term debt 24,001 24,530 Less: Total unamortized debt discount, premium and issuance costs 222 236 Less: Current maturities 3,213 2,476 Long-term debt, net of current maturities $ 20,566 $ 21,818
Schedule of Credit Facilities	Certain details of our 2013 Credit Facilities, 2014 Credit Facilities, April 2016 Credit Facilities and December 2016 Credit Facilities (collectively referred to as the Credit Facilities) are shown in the table below as of December 31, 2018 : 2013 Credit Facilities 2014 Credit Facilities April 2016 Credit Facilities December 2016 Credit Facilities 2013 Replacement Term Loan 2013 2014 Term Loan 2014 April 2016 Term Loan April 2016 December 2016 Term Loan Aggregate principal issued or credit facility availability (in millions) $1,900 $1,000 $1,250 $1,543 $1,000 $300 $1,250 Principal outstanding or drawn (in millions) $1,825 $— $1,215 $— $980 $— $1,225 Maturity date June 2025 October 2023 October 2021 October 2023 April 2023 October 2023 December 2023 LIBOR margin 1.75% 2.00% 2.00% 2.00% 2.00% 2.00% 2.00% The table below shows the maximum availability under revolving credit facilities, all of which were undrawn, as of December 31, 2018 (in millions): 2013 Revolving Facility $ 1,000 2014 Revolving Facility 1,543 April 2016 Revolving Facility 300 Total $ 2,843
Schedule of Maturities of Long-Term Debt and Capital Lease Obligations	At December 31, 2018 , the maturities of long-term debt are as follows (in millions): 2019 $ 3,258 2020 2,320 2021 3,411 2022 1,346 2023 3,894 2024 and thereafter 9,772 Total $ 24,001
Schedule of Collateral Coverage Tests	Specifically, we are required to meet certain collateral coverage tests on an annual basis for our 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 34.8% 18.8% 40.9% 57.5% 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 European Union (including 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	Certain information regarding the 2012-2 Class C(R) EETC equipment notes, as of December 31, 2018 , is set forth in the table below. 2012-2C(R) EETCs Series C(R) Aggregate principal issued $100 million Fixed interest rate per annum 4.70% Maturity date June 2021 Certain information regarding the 2017-2 EETC equipment notes, as of December 31, 2018 , 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 Fixed interest rate per annum 3.35% 3.60% 3.70% Maturity date October 2029 October 2029 October 2025
Unsecured Debt [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Schedule of Long-Term Debt	The details of our 5.50% and 4.625% senior notes are shown in the table below as of December 31, 2018 : 5.50% Senior Notes 4.625% Senior Notes Aggregate principal issued and outstanding $750 million $500 million Maturity date October 2019 March 2020 Fixed interest rate per annum 5.50% 4.625% Interest payments 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 included in the consolidated balance sheets consisted of (in millions): December 31, 2018 2017 Secured 2013 Credit Facilities, variable interest rate of 4.26%, installments through 2025 (a) $ 1,825 $ 1,825 2014 Credit Facilities, variable interest rate of 4.39%, installments through 2021 (a) 1,215 728 April 2016 Credit Facilities, variable interest rate of 4.52%, installments through 2023 (a) 980 990 December 2016 Credit Facilities, variable interest rate of 4.46%, installments through 2023 (a) 1,225 1,238 Aircraft enhanced equipment trust certificates (EETCs), fixed interest rates ranging from 3.00% to 9.01%, averaging 4.21%, maturing from 2019 to 2029 (b) 11,648 11,881 Equipment loans and other notes payable, fixed and variable interest rates ranging from 2.34% to 8.48%, averaging 4.26%, maturing from 2019 to 2030 (c) 5,060 5,259 Special facility revenue bonds, fixed interest rates of 5.00%, maturing from 2019 to 2031 769 828 Other secured obligations — 1 Total long-term debt 22,722 22,750 Less: Total unamortized debt discount, premium and issuance costs 219 227 Less: Current maturities 2,466 1,980 Long-term debt, net of current maturities $ 20,037 $ 20,543
Schedule of Credit Facilities	The table below shows the maximum availability under revolving credit facilities, all of which were undrawn, as of December 31, 2018 (in millions): 2013 Revolving Facility $ 1,000 2014 Revolving Facility 1,543 April 2016 Revolving Facility 300 Total $ 2,843 Certain details of American’s 2013 Credit Facilities, 2014 Credit Facilities, April 2016 Credit Facilities and December 2016 Credit Facilities (collectively referred to as the Credit Facilities) are shown in the table below as of December 31, 2018 : 2013 Credit Facilities 2014 Credit Facilities April 2016 Credit Facilities December 2016 Credit Facilities 2013 Replacement Term Loan 2013 2014 Term 2014 April 2016 April 2016 December 2016 Term Loan Aggregate principal issued or credit facility availability (in millions) $1,900 $1,000 $1,250 $1,543 $1,000 $300 $1,250 Principal outstanding or drawn (in millions) $1,825 $— $1,215 $— $980 $— $1,225 Maturity date June 2025 October 2023 October 2021 October 2023 April 2023 October 2023 December 2023 LIBOR margin 1.75% 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%
Schedule of Maturities of Long-Term Debt and Capital Lease Obligations	At December 31, 2018 , the maturities of long-term debt are as follows (in millions): 2019 $ 2,508 2020 1,815 2021 3,409 2022 1,344 2023 3,892 2024 and thereafter 9,754 Total $ 22,722
Schedule of Collateral Coverage Tests	Specifically, American is required to meet certain collateral coverage tests on an annual basis for its 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 34.8% 18.8% 40.9% 57.5% 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 European Union (including 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 2012-2 Class C(R) EETC equipment notes, as of December 31, 2018 , is set forth in the table below. 2012-2C(R) EETCs Series C(R) Aggregate principal issued $100 million Fixed interest rate per annum 4.70% Maturity date June 2021 Certain information regarding the 2017-2 EETC equipment notes, as of December 31, 2018 , 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 Fixed interest rate per annum 3.35% 3.60% 3.70% Maturity date October 2029 October 2029 October 2025

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Components of Lease Expense	The components of lease expense were as follows (in millions): Year Ended Operating lease cost $ 1,907 Finance lease cost: Amortization of assets 78 Interest on lease liabilities 48 Variable lease cost 2,353 Total net lease cost $ 4,386
Supplemental Balance Sheet Information	Supplemental balance sheet information related to leases was as follows (in millions, except lease term and discount rate): December 31, 2018 Operating leases: Operating lease ROU assets $ 9,151 Current operating lease liabilities $ 1,654 Noncurrent operating lease liabilities 7,902 Total operating lease liabilities $ 9,556 Finance leases: Property and equipment, at cost $ 936 Accumulated amortization (391 ) Property and equipment, net $ 545 Current obligations of finance leases $ 81 Finance leases, net of current obligations 613 Total finance lease liabilities $ 694 Weighted average remaining lease term (in years): Operating leases 7.6 Finance leases 7.4 Weighted average discount rate: Operating leases 4.6 % Finance leases 6.5 %
Supplemental Cash Flow and Other Information	Supplemental cash flow and other information related to leases was as follows (in millions): Year Ended Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 1,931 Operating cash flows from finance leases 48 Financing cash flows from finance leases 78 ROU assets obtained in exchange for lease liabilities: Operating leases 1,292 Gain on sale leaseback transactions, net 59
Maturities of Operating Lease Liabilities	Maturities of lease liabilities were as follows (in millions): December 31, 2018 Operating Leases Finance Leases 2019 $ 1,912 $ 124 2020 1,838 120 2021 1,636 118 2022 1,438 122 2023 1,255 105 2024 and thereafter 3,620 282 Total lease payments 11,699 871 Less: Imputed interest (2,143 ) (177 ) Total lease obligations 9,556 694 Less: Current obligations (1,654 ) (81 ) Long-term lease obligations $ 7,902 $ 613
Maturities of Finance Lease Liabilities	Maturities of lease liabilities were as follows (in millions): December 31, 2018 Operating Leases Finance Leases 2019 $ 1,912 $ 124 2020 1,838 120 2021 1,636 118 2022 1,438 122 2023 1,255 105 2024 and thereafter 3,620 282 Total lease payments 11,699 871 Less: Imputed interest (2,143 ) (177 ) Total lease obligations 9,556 694 Less: Current obligations (1,654 ) (81 ) Long-term lease obligations $ 7,902 $ 613
Future Minimum Lease Payment Obligations Under Operating Leases	As of December 31, 2017 , future minimum lease payment obligations under noncancellable operating leases, including payments for the lease of certain aircraft under capacity purchase agreements, as well as payments under capital lease obligations were as follows (in millions): December 31, 2017 Operating Leases Capital Leases 2018 $ 2,572 $ 126 2019 2,329 123 2020 2,104 120 2021 1,621 118 2022 1,398 122 2023 and thereafter 3,965 387 Total lease payments $ 13,989 996 Less: Imputed interest (225 ) Total lease obligations 771 Less: Current obligations (78 ) Long-term lease obligations $ 693
Future Minimum Lease Payment Obligations Under Capital Leases	As of December 31, 2017 , future minimum lease payment obligations under noncancellable operating leases, including payments for the lease of certain aircraft under capacity purchase agreements, as well as payments under capital lease obligations were as follows (in millions): December 31, 2017 Operating Leases Capital Leases 2018 $ 2,572 $ 126 2019 2,329 123 2020 2,104 120 2021 1,621 118 2022 1,398 122 2023 and thereafter 3,965 387 Total lease payments $ 13,989 996 Less: Imputed interest (225 ) Total lease obligations 771 Less: Current obligations (78 ) Long-term lease obligations $ 693
American Airlines, Inc. [Member]
Lessee, Lease, Description [Line Items]
Components of Lease Expense	The components of lease expense were as follows (in millions): Year Ended Operating lease cost $ 1,889 Finance lease cost: Amortization of assets 78 Interest on lease liabilities 48 Variable lease cost 2,353 Total net lease cost $ 4,368
Supplemental Balance Sheet Information	Supplemental balance sheet information related to leases was as follows (in millions, except lease term and discount rate): December 31, 2018 Operating leases: Operating lease ROU assets $ 9,094 Current operating lease liabilities 1,639 Noncurrent operating lease liabilities 7,857 Total operating lease liabilities $ 9,496 Finance leases: Property and equipment, at cost $ 936 Accumulated amortization (391 ) Property and equipment, net $ 545 Current obligations of finance leases $ 81 Finance leases, net of current obligations 613 Total finance lease liabilities $ 694 Weighted average remaining lease term (in years): Operating leases 7.6 Finance leases 7.4 Weighted average discount rate: Operating leases 4.6 % Finance leases 6.5 %
Supplemental Cash Flow and Other Information	Supplemental cash flow and other information related to leases was as follows (in millions): Year Ended Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 1,914 Operating cash flows from finance leases 48 Financing cash flows from finance leases 78 ROU assets obtained in exchange for lease liabilities: Operating leases 1,258 Gain on sale leaseback transactions, net 59
Maturities of Operating Lease Liabilities	Maturities of lease liabilities were as follows (in millions): December 31, 2018 Operating Leases Finance Leases 2019 $ 1,894 $ 124 2020 1,824 120 2021 1,625 118 2022 1,428 122 2023 1,250 105 2024 and thereafter 3,611 282 Total lease payments 11,632 871 Less: Imputed interest (2,136 ) (177 ) Total lease obligations 9,496 694 Less: Current obligations (1,639 ) (81 ) Long-term lease obligations $ 7,857 $ 613
Maturities of Finance Lease Liabilities	Maturities of lease liabilities were as follows (in millions): December 31, 2018 Operating Leases Finance Leases 2019 $ 1,894 $ 124 2020 1,824 120 2021 1,625 118 2022 1,428 122 2023 1,250 105 2024 and thereafter 3,611 282 Total lease payments 11,632 871 Less: Imputed interest (2,136 ) (177 ) Total lease obligations 9,496 694 Less: Current obligations (1,639 ) (81 ) Long-term lease obligations $ 7,857 $ 613
Future Minimum Lease Payment Obligations Under Operating Leases	As of December 31, 2017 , future minimum lease payment obligations under noncancellable operating leases, including payments for the lease of certain aircraft under capacity purchase agreements, as well as payments under capital lease obligations were as follows (in millions): December 31, 2017 Operating Leases Capital Leases 2018 $ 2,555 $ 126 2019 2,321 123 2020 2,096 120 2021 1,613 118 2022 1,394 122 2023 and thereafter 3,952 387 Total lease payments $ 13,931 996 Less: Imputed interest (225 ) Total lease obligations 771 Less: Current obligations (78 ) Long-term lease obligations $ 693
Future Minimum Lease Payment Obligations Under Capital Leases	As of December 31, 2017 , future minimum lease payment obligations under noncancellable operating leases, including payments for the lease of certain aircraft under capacity purchase agreements, as well as payments under capital lease obligations were as follows (in millions): December 31, 2017 Operating Leases Capital Leases 2018 $ 2,555 $ 126 2019 2,321 123 2020 2,096 120 2021 1,613 118 2022 1,394 122 2023 and thereafter 3,952 387 Total lease payments $ 13,931 996 Less: Imputed interest (225 ) Total lease obligations 771 Less: Current obligations (78 ) Long-term lease obligations $ 693

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Taxes [Line Items]
Components of Income Tax Provision	The significant components of the income tax provision were (in millions): Year Ended December 31, 2018 2017 2016 Current income tax provision: State and Local $ 3 $ 10 $ 3 Foreign 29 14 9 Current income tax provision 32 24 12 Deferred income tax provision: Federal 390 2,026 1,456 State and Local 50 63 100 Deferred income tax provision 440 2,089 1,556 Total income tax provision $ 472 $ 2,113 $ 1,568
Reconciliation of Income Tax Provision	The income tax provision differed from amounts computed at the statutory federal income tax rate as follows (in millions): Year Ended December 31, 2018 2017 2016 Statutory income tax provision $ 396 $ 1,188 $ 1,453 State income tax provision, net of federal tax effect 44 59 56 Foreign income taxes, net of federal tax effect 23 7 6 Book expenses not deductible for tax purposes 12 33 35 Bankruptcy administration expenses — 1 1 2017 Tax Act — 823 — Change in valuation allowance (6 ) (3 ) 7 Other, net 3 5 10 Income tax provision $ 472 $ 2,113 $ 1,568
Deferred Tax Assets and Liabilities	The components of our deferred tax assets and liabilities were (in millions): December 31, 2018 2017 Deferred tax assets: Operating loss carryforwards $ 2,343 $ 2,281 Leases 2,189 107 Pensions 1,430 1,559 Loyalty program liability 1,770 1,809 Alternative minimum tax (AMT) credit carryforwards 175 344 Postretirement benefits other than pensions 145 170 Rent expense 136 160 Reorganization items 33 35 Other 631 678 Total deferred tax assets 8,852 7,143 Valuation allowance (30 ) (36 ) Net deferred tax assets 8,822 7,107 Deferred tax liabilities: Accelerated depreciation and amortization (5,280 ) (5,045 ) Leases (2,081 ) — Other (326 ) (279 ) Total deferred tax liabilities (7,687 ) (5,324 ) Net deferred tax asset $ 1,135 $ 1,783
American Airlines, Inc. [Member]
Income Taxes [Line Items]
Components of Income Tax Provision	The significant components of the income tax provision were (in millions): Year Ended December 31, 2018 2017 2016 Current income tax provision: State and Local $ 3 $ 14 $ 1 Foreign 28 10 9 Current income tax provision 31 24 10 Deferred income tax provision: Federal 453 2,176 1,507 State and Local 50 70 90 Deferred income tax provision 503 2,246 1,597 Total income tax provision $ 534 $ 2,270 $ 1,607
Reconciliation of Income Tax Provision	The income tax provision differed from amounts computed at the statutory federal income tax rate as follows (in millions): Year Ended December 31, 2018 2017 2016 Statutory income tax provision $ 460 $ 1,244 $ 1,504 State income tax provision, net of federal tax effect 46 53 61 Foreign income taxes, net of federal tax effect 22 6 6 Book expenses not deductible for tax purposes 10 30 32 Bankruptcy administration expenses — 1 1 2017 Tax Act — 924 — Change in valuation allowance (6 ) 4 (1 ) Other, net 2 8 4 Income tax provision $ 534 $ 2,270 $ 1,607
Deferred Tax Assets and Liabilities	The components of American’s deferred tax assets and liabilities were (in millions): December 31, 2018 2017 Deferred tax assets: Operating loss carryforwards $ 2,420 $ 2,409 Leases 2,176 107 Pensions 1,421 1,549 Loyalty program liability 1,770 1,809 Alternative minimum tax (AMT) credit carryforwards 231 457 Postretirement benefits other than pensions 145 170 Rent expense 136 160 Reorganization items 33 35 Other 588 638 Total deferred tax assets 8,920 7,334 Valuation allowance (19 ) (25 ) Net deferred tax assets 8,901 7,309 Deferred tax liabilities: Accelerated depreciation and amortization (5,243 ) (4,999 ) Leases (2,068 ) — Other (321 ) (274 ) Total deferred tax liabilities (7,632 ) (5,273 ) Net deferred tax asset $ 1,269 $ 2,036

Fair Value Measurements and O_2

Fair Value Measurements and Other Investments (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 Total Level 1 Level 2 Level 3 Short-term investments (1) (2) : Money market funds $ 16 $ 16 $ — $ — Corporate obligations 1,658 — 1,658 — Bank notes/certificates of deposit/time deposits 2,436 — 2,436 — Repurchase agreements 375 — 375 — 4,485 16 4,469 — Restricted cash and short-term investments (1) 154 12 142 — Long-term investments (3) 189 189 — — Total $ 4,828 $ 217 $ 4,611 $ — (1) Unrealized gains or losses on short-term investments are recorded in accumulated other comprehensive 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 $877 million of bank notes/certificates of deposit/time deposits and $101 million of corporate obligations. (3) Long-term investments primarily include our equity investment in China Southern Airlines, in which we presently own a 2.2% equity interest, and are classified in other assets on the consolidated balance sheets. 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 are recorded in accumulated other comprehensive 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.
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, 2018 December 31, 2017 Carrying Value Fair Value Carrying Value Fair Value Long-term debt, including current maturities $ 23,779 $ 23,775 $ 24,294 $ 24,985
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, 2018 Total Level 1 Level 2 Level 3 Short-term investments (1) (2) : Money market funds $ 14 $ 14 $ — $ — Corporate obligations 1,658 — 1,658 — Bank notes/certificates of deposit/time deposits 2,435 — 2,435 — Repurchase agreements 375 — 375 — 4,482 14 4,468 — Restricted cash and short-term investments (1) 154 12 142 — Long-term investments (3) 189 189 — — Total $ 4,825 $ 215 $ 4,610 $ — (1) Unrealized gains or losses on short-term investments are recorded in accumulated other comprehensive 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 $877 million of bank notes/certificates of deposit/time deposits and $101 million of corporate obligations. (3) Long-term investments primarily include American's equity investment in China Southern Airlines, in which American presently owns a 2.2% equity interest, and are classified in other assets on the consolidated balance sheets. 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 are recorded in accumulated other comprehensive 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.
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, 2018 December 31, 2017 Carrying Value Fair Value Carrying Value Fair Value Long-term debt, including current maturities $ 22,503 $ 22,497 $ 22,523 $ 23,165

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 and 2017 : Pension Benefits Retiree Medical and Other Postretirement Benefits 2018 2017 2018 2017 (In millions) Benefit obligation at beginning of period $ 18,275 $ 17,238 $ 1,011 $ 991 Service cost 3 2 5 4 Interest cost 674 721 35 39 Actuarial (gain) loss (1) (2) (1,910 ) 1,016 (133 ) 49 Settlements (4 ) (4 ) — — Benefit payments (662 ) (726 ) (81 ) (80 ) Other 2 28 — 8 Benefit obligation at end of period $ 16,378 $ 18,275 $ 837 $ 1,011 Fair value of plan assets at beginning of period $ 11,395 $ 10,017 $ 295 $ 266 Actual return on plan assets (1,151 ) 1,797 (24 ) 37 Employer contributions (3) 475 286 35 72 Settlements (4 ) (4 ) — — Benefit payments (662 ) (726 ) (81 ) (80 ) Other — 25 — — Fair value of plan assets at end of period $ 10,053 $ 11,395 $ 225 $ 295 Funded status at end of period $ (6,325 ) $ (6,880 ) $ (612 ) $ (716 ) (1) The December 31, 2018 and 2017 pension actuarial (gain) loss primarily relates to changes in our weighted average discount rate and mortality assumptions and, in 2018, changes to our retirement rate assumptions. (2) The December 31, 2018 and 2017 retiree medical and other postretirement benefits actuarial (gain) loss primarily relates to weighted average discount rate assumption changes and, in 2018, changes to our medical trend and per capita claim assumptions. (3) During 2018 , we contributed $475 million to our defined benefit pension plans, including supplemental contributions of $433 million in addition to a $42 million minimum required contribution. 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 contribution.
Schedule of Changes in Fair Value of Plan Assets	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, 2018 and 2017 : Pension Benefits Retiree Medical and Other Postretirement Benefits 2018 2017 2018 2017 (In millions) Benefit obligation at beginning of period $ 18,275 $ 17,238 $ 1,011 $ 991 Service cost 3 2 5 4 Interest cost 674 721 35 39 Actuarial (gain) loss (1) (2) (1,910 ) 1,016 (133 ) 49 Settlements (4 ) (4 ) — — Benefit payments (662 ) (726 ) (81 ) (80 ) Other 2 28 — 8 Benefit obligation at end of period $ 16,378 $ 18,275 $ 837 $ 1,011 Fair value of plan assets at beginning of period $ 11,395 $ 10,017 $ 295 $ 266 Actual return on plan assets (1,151 ) 1,797 (24 ) 37 Employer contributions (3) 475 286 35 72 Settlements (4 ) (4 ) — — Benefit payments (662 ) (726 ) (81 ) (80 ) Other — 25 — — Fair value of plan assets at end of period $ 10,053 $ 11,395 $ 225 $ 295 Funded status at end of period $ (6,325 ) $ (6,880 ) $ (612 ) $ (716 ) (1) The December 31, 2018 and 2017 pension actuarial (gain) loss primarily relates to changes in our weighted average discount rate and mortality assumptions and, in 2018, changes to our retirement rate assumptions. (2) The December 31, 2018 and 2017 retiree medical and other postretirement benefits actuarial (gain) loss primarily relates to weighted average discount rate assumption changes and, in 2018, changes to our medical trend and per capita claim assumptions. (3) During 2018 , we contributed $475 million to our defined benefit pension plans, including supplemental contributions of $433 million in addition to a $42 million minimum required contribution. 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 contribution.
Schedule of Amounts Recognized in Consolidated Balance Sheets	Balance Sheet Position Pension Benefits Retiree Medical and Other Postretirement Benefits 2018 2017 2018 2017 (In millions) As of December 31, Current liability $ 7 $ 10 $ 23 $ 89 Noncurrent liability 6,318 6,870 589 627 Total liabilities $ 6,325 $ 6,880 $ 612 $ 716
Schedule of Amounts Recognized in Other Comprehensive Income	Net actuarial loss (gain) $ 5,356 $ 5,351 $ (452 ) $ (388 ) Prior service cost (benefit) 131 160 (362 ) (600 ) Total accumulated other comprehensive loss (income), pre-tax $ 5,487 $ 5,511 $ (814 ) $ (988 )
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 2018 2017 2018 2017 (In millions) Projected benefit obligation $ 16,351 $ 18,245 $ — $ — Accumulated benefit obligation (ABO) 16,341 18,235 — — Accumulated postretirement benefit obligation — — 837 1,011 Fair value of plan assets 10,023 11,364 225 295 ABO less fair value of plan assets 6,318 6,871 — —
Components of Net Periodic Benefit Cost (Income)	Net Periodic Benefit Cost (Income) Pension Benefits Retiree Medical and Other Postretirement Benefits 2018 2017 2016 2018 2017 2016 (In millions) Defined benefit plans: Service cost $ 3 $ 2 $ 2 $ 5 $ 4 $ 3 Interest cost 674 721 749 35 39 47 Expected return on assets (905 ) (790 ) (750 ) (24 ) (21 ) (20 ) Settlements — 1 — — — — Amortization of: Prior service cost (benefit) 28 28 28 (236 ) (237 ) (240 ) Unrecognized net loss (gain) 141 144 126 (21 ) (23 ) (17 ) Net periodic benefit cost (income) $ (59 ) $ 106 $ 155 $ (241 ) $ (238 ) $ (227 )
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 2018 2017 2018 2017 Benefit obligations: Weighted average discount rate 4.40% 3.80% 4.30% 3.60% Pension Benefits Retiree Medical and Other Postretirement Benefits 2018 2017 2016 2018 2017 2016 Net periodic benefit cost: Weighted average discount rate 3.80% 4.30% 4.70% 3.60% 4.10% 4.42% 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 3.91% 4.19% 4.25% (1) The weighted average health care cost trend rate at December 31, 2018 is assumed to decline gradually to 3.45% by 2026 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 2018 service and interest cost $ 2 $ (2 ) Increase (decrease) on benefit obligation as of December 31, 2018 47 (43 )
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): 2019 2020 2021 2022 2023 2024-2028 Pension benefits $ 720 $ 758 $ 797 $ 836 $ 876 $ 4,917 Retiree medical and other postretirement benefits 84 75 71 66 64 280
Schedule of Allocation of Plan Assets	The current strategic target asset allocation is as follows: Asset Class/Sub-Class Allowed Range Equity 60% - 85% 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% 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, 2018 , were as follows (in millions): Private Market Partnerships Insurance Group Annuity Contracts Beginning balance at December 31, 2017 $ 14 $ 2 Actual loss on plan assets: Relating to assets still held at the reporting date (2 ) — Purchases 1 — Sales (6 ) — Ending balance at December 31, 2018 $ 7 $ 2 Changes in fair value measurements of Level 3 investments during the year ended December 31, 2017 , were as follows (in millions): Private Market 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
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, 2018 and 2017 , by asset category, are as follows (in millions): Fair Value Measurements as of December 31, 2018 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 $ 23 $ — $ — $ 23 Equity securities: International markets (a) (b) 3,181 — — 3,181 Large-cap companies (b) 2,021 — — 2,021 Mid-cap companies (b) 583 — — 583 Small-cap companies (b) 122 — — 122 Mutual funds (c) 52 — — 52 Fixed income: Corporate debt (d) — 2,116 — 2,116 Government securities (e) — 228 — 228 U.S. municipal securities — 40 — 40 Alternative instruments: Private market partnerships (f) — — 7 7 Private market partnerships measured at net asset value (f) (h) — — — 1,188 Common/collective trusts (g) — 218 — 218 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 47 — — 47 Due to/from brokers for sale of securities – net 5 — — 5 Other liabilities – net (7 ) — — (7 ) Total $ 6,027 $ 2,602 $ 9 $ 10,053 (a) Holdings are diversified as follows: 17% United Kingdom, 10% Japan, 8% France, 7% Switzerland, 6% Ireland, 17% emerging markets and the remaining 35% 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 37% in equity securities of large-cap, mid-cap and small-cap U.S. companies, 38% in U.S. treasuries and corporate bonds and 25% in equity securities of international companies. (d) Includes approximately 77% investments in corporate debt with a S&P rating lower than A and 23% 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 32% investments in U.S. domestic government securities, 37% in emerging market government securities and 31% 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 $1.0 billion over the next ten years . (g) Investment includes 45% in an emerging market 103-12 Investment Trust with investments in emerging country equity securities, 37% in a collective interest trust investing primarily in short-term securities, 12% in Canadian segregated balanced value, income growth and diversified pooled funds and 6% 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, 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 market partnerships (f) — — 14 14 Private market 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.
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, 2018 by asset category, were as follows (in millions): Fair Value Measurements as of December 31, 2018 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 $ 4 $ — $ — $ 4 Mutual funds – AAL Class — 221 — 221 Total $ 4 $ 221 $ — $ 225 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
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, 2018 and 2017 : Pension Benefits Retiree Medical and Other Postretirement Benefits 2018 2017 2018 2017 (In millions) Benefit obligation at beginning of period $ 18,175 $ 17,148 $ 1,010 $ 990 Service cost 2 2 5 4 Interest cost 670 717 35 39 Actuarial (gain) loss (1) (2) (1,905 ) 1,007 (132 ) 49 Settlements (4 ) (4 ) — — Benefit payments (659 ) (723 ) (81 ) (80 ) Other 3 28 — 8 Benefit obligation at end of period $ 16,282 $ 18,175 $ 837 $ 1,010 Fair value of plan assets at beginning of period $ 11,340 $ 9,968 $ 295 $ 266 Actual return on plan assets (1,148 ) 1,788 (24 ) 37 Employer contributions (3) 472 286 35 72 Settlements (4 ) (4 ) — — Benefit payments (659 ) (723 ) (81 ) (80 ) Other — 25 — — Fair value of plan assets at end of period $ 10,001 $ 11,340 $ 225 $ 295 Funded status at end of period $ (6,281 ) $ (6,835 ) $ (612 ) $ (715 ) (1) The December 31, 2018 and 2017 pension actuarial (gain) loss primarily relates to changes in American’s weighted average discount rate and mortality assumptions and, in 2018, changes to American’s retirement rate assumptions. (2) The December 31, 2018 and 2017 retiree medical and other postretirement benefits actuarial (gain) loss primarily relates to weighted average discount rate assumption changes and, in 2018, changes to American’s medical trend and per capita claim assumptions. (3) During 2018 , American contributed $472 million to its defined benefit pension plans, including supplemental contributions of $433 million in addition to a $39 million minimum required contribution. 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 contribution.
Schedule of Changes in Fair Value of Plan Assets	Fair value of plan assets at beginning of period $ 11,340 $ 9,968 $ 295 $ 266 Actual return on plan assets (1,148 ) 1,788 (24 ) 37 Employer contributions (3) 472 286 35 72 Settlements (4 ) (4 ) — — Benefit payments (659 ) (723 ) (81 ) (80 ) Other — 25 — — Fair value of plan assets at end of period $ 10,001 $ 11,340 $ 225 $ 295 Funded status at end of period $ (6,281 ) $ (6,835 ) $ (612 ) $ (715 ) (1) The December 31, 2018 and 2017 pension actuarial (gain) loss primarily relates to changes in American’s weighted average discount rate and mortality assumptions and, in 2018, changes to American’s retirement rate assumptions. (2) The December 31, 2018 and 2017 retiree medical and other postretirement benefits actuarial (gain) loss primarily relates to weighted average discount rate assumption changes and, in 2018, changes to American’s medical trend and per capita claim assumptions. (3) During 2018 , American contributed $472 million to its defined benefit pension plans, including supplemental contributions of $433 million in addition to a $39 million minimum required contribution. 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 contribution.
Schedule of Amounts Recognized in Consolidated Balance Sheets	Pension Benefits Retiree Medical and Other Postretirement Benefits 2018 2017 2018 2017 (In millions) As of December 31, Current liability $ 7 $ 10 $ 23 $ 88 Noncurrent liability 6,274 6,825 589 627 Total liabilities $ 6,281 $ 6,835 $ 612 $ 715
Schedule of Amounts Recognized in Other Comprehensive Income	Net actuarial loss (gain) $ 5,341 $ 5,337 $ (452 ) $ (388 ) Prior service cost (benefit) 131 159 (362 ) (600 ) Total accumulated other comprehensive loss (income), pre-tax $ 5,472 $ 5,496 $ (814 ) $ (988 )
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 2018 2017 2018 2017 (In millions) Projected benefit obligation $ 16,254 $ 18,144 $ — $ — Accumulated benefit obligation (ABO) 16,246 18,135 — — Accumulated postretirement benefit obligation — — 837 1,010 Fair value of plan assets 9,971 11,307 225 295 ABO less fair value of plan assets 6,275 6,828 — —
Components of Net Periodic Benefit Cost (Income)	Pension Benefits Retiree Medical and Other Postretirement Benefits 2018 2017 2016 2018 2017 2016 (In millions) Defined benefit plans: Service cost $ 2 $ 2 $ 2 $ 5 $ 4 $ 3 Interest cost 670 717 746 35 39 47 Expected return on assets (901 ) (786 ) (747 ) (24 ) (21 ) (20 ) Settlements — 1 — — — — Amortization of: Prior service cost (benefit) 28 28 28 (236 ) (237 ) (240 ) Unrecognized net loss (gain) 140 144 125 (21 ) (23 ) (16 ) Net periodic benefit cost (income) $ (61 ) $ 106 $ 154 $ (241 ) $ (238 ) $ (226 )
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 2018 2017 2018 2017 Benefit obligations: Weighted average discount rate 4.40% 3.80% 4.30% 3.60% Pension Benefits Retiree Medical and Other Postretirement Benefits 2018 2017 2016 2018 2017 2016 Net periodic benefit cost: Weighted average discount rate 3.80% 4.30% 4.70% 3.60% 4.10% 4.42% 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 3.91% 4.19% 4.25% (1) The weighted average health care cost trend rate at December 31, 2018 is assumed to decline gradually to 3.45% by 2026 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 2018 service and interest cost $ 2 $ (2 ) Increase (decrease) on benefit obligation as of December 31, 2018 47 (43 )
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): 2019 2020 2021 2022 2023 2024-2028 Pension benefits $ 717 $ 754 $ 793 $ 831 $ 872 $ 4,891 Retiree medical and other postretirement benefits 84 75 71 66 64 280
Schedule of Allocation of Plan Assets	The current strategic target asset allocation is as follows: Asset Class/Sub-Class Allowed Range Equity 60% - 85% 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% 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, 2018 , were as follows (in millions): Private Market Partnerships Insurance Group Annuity Contracts Beginning balance at December 31, 2017 $ 14 $ 2 Actual loss on plan assets: Relating to assets still held at the reporting date (2 ) — Purchases 1 — Sales (6 ) — Ending balance at December 31, 2018 $ 7 $ 2 Changes in fair value measurements of Level 3 investments during the year ended December 31, 2017 , were as follows (in millions): Private Market 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
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, 2018 and 2017 , by asset category, are as follows (in millions): Fair Value Measurements as of December 31, 2018 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 $ 23 $ — $ — $ 23 Equity securities: International markets (a) (b) 3,181 — — 3,181 Large-cap companies (b) 2,021 — — 2,021 Mid-cap companies (b) 583 — — 583 Small-cap companies (b) 122 — — 122 Fixed income: Corporate debt (c) — 2,116 — 2,116 Government securities (d) — 228 — 228 U.S. municipal securities — 40 — 40 Alternative instruments: Private market partnerships (e) — — 7 7 Private market partnerships measured at net asset value (e) (g) — — — 1,188 Common/collective trusts (f) — 218 — 218 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 47 — — 47 Due to/from brokers for sale of securities – net 5 — — 5 Other liabilities – net (7 ) — — (7 ) Total $ 5,975 $ 2,602 $ 9 $ 10,001 (a) Holdings are diversified as follows: 17% United Kingdom, 10% Japan, 8% France, 7% Switzerland, 6% Ireland, 17% emerging markets and the remaining 35% 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 77% investments in corporate debt with a S&P rating lower than A and 23% 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 32% investments in U.S. domestic government securities, 37% in emerging market government securities and 31% 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 $1.0 billion over the next ten years . (f) Investment includes 45% in an emerging market 103-12 Investment Trust with investments in emerging country equity securities, 37% in a collective interest trust investing primarily in short-term securities, 12% in Canadian segregated balanced value, income growth and diversified pooled funds and 6% 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, 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 market partnerships (e) — — 14 14 Private market 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.
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, 2018 by asset category, were as follows (in millions): Fair Value Measurements as of December 31, 2018 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 $ 4 $ — $ — $ 4 Mutual funds – AAL Class — 221 — 221 Total $ 4 $ 221 $ — $ 225 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

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of Accumulated Other Comprehensive Loss (AOCI)	The components of AOCI are as follows (in millions): Pension, Unrealized Loss on Investments Income Tax (1) Total 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 ) Other comprehensive income (loss) before reclassifications (62 ) (4 ) 15 (51 ) Amounts reclassified from AOCI (88 ) — 19 (2) (69 ) Net current-period other comprehensive income (loss) (150 ) (4 ) 34 (120 ) Balance at December 31, 2018 $ (4,673 ) $ (5 ) $ (596 ) $ (5,274 ) (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 our consolidated statements of operations.
Reclassifications out of AOCI	Reclassifications out of AOCI for the years ended December 31, 2018 and 2017 are as follows (in millions): Amounts reclassified from AOCI Affected line items on the Year Ended December 31, AOCI Components 2018 2017 Amortization of pension, retiree medical and other postretirement benefits: Prior service benefit $ (161 ) $ (132 ) Nonoperating other income, net Actuarial loss 92 77 Nonoperating other income, net Total reclassifications for the period, net of tax $ (69 ) $ (55 )
American Airlines, Inc. [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of Accumulated Other Comprehensive Loss (AOCI)	The components of AOCI are as follows (in millions): Pension, Unrealized Loss on Investments Income Tax (1) Total 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 ) Other comprehensive income (loss) before reclassifications (61 ) (4 ) 15 (50 ) Amounts reclassified from AOCI (89 ) — 20 (2) (69 ) Net current-period other comprehensive income (loss) (150 ) (4 ) 35 (119 ) Balance at December 31, 2018 $ (4,658 ) $ (5 ) $ (707 ) $ (5,370 ) (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 American’s consolidated statements of operations.
Reclassifications out of AOCI	Reclassifications out of AOCI for the years ended December 31, 2018 and 2017 are as follows (in millions): Amounts reclassified from AOCI Affected line items on the Year Ended December 31, AOCI Components 2018 2017 Amortization of pension, retiree medical and other postretirement benefits: Prior service benefit $ (161 ) $ (132 ) Nonoperating other income, net Actuarial loss 92 77 Nonoperating other income, net Total reclassifications for the period, net of tax $ (69 ) $ (55 )

Commitments, Contingencies an_2

Commitments, Contingencies and Guarantees (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 are expected to be as follows (approximately, in millions): 2019 2020 2021 2022 2023 2024 and Thereafter Total Payments for aircraft commitments and certain engines (1) $ 2,906 $ 1,683 $ 994 $ 1,378 $ 1,450 $ 6,047 $ 14,458 (1) These amounts are net of purchase deposits currently held by the manufacturers and include all commitments for regional aircraft. We have granted a security interest in certain of our purchase deposits with Boeing. Our purchase deposits held by all manufacturers totaled $1.3 billion as of December 31, 2018 .
Minimum Fixed Obligations under Capacity Purchase Agreements with Third-Party Regional Carriers	As of December 31, 2018 , American’s minimum fixed obligations under its capacity purchase agreements with third-party regional carriers are as follows (approximately, in millions): 2019 2020 2021 2022 2023 2024 and Thereafter Total Minimum fixed obligations under capacity purchase agreements with third-party regional carriers (1) $ 1,101 $ 930 $ 765 $ 618 $ 487 $ 1,043 $ 4,944 (1) Represents minimum payments under capacity purchase agreements with third-party regional carriers, which are estimates of costs based on assumed minimum levels of flying under the capacity purchase agreements and American’s actual payments could differ materially. Excludes payments for the lease of certain aircraft under capacity purchase agreements, which are reflected in the operating lease obligations in Note 6.
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, 2018 are expected to be as follows (approximately, in millions): 2019 2020 2021 2022 2023 2024 and Thereafter Total Payments for aircraft commitments and certain engines (1) $ 2,906 $ 1,683 $ 994 $ 1,378 $ 1,450 $ 6,047 $ 14,458 (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 certain of its purchase deposits with Boeing. American’s purchase deposits held by all manufacturers totaled $1.3 billion as of December 31, 2018 .
Minimum Fixed Obligations under Capacity Purchase Agreements with Third-Party Regional Carriers	As of December 31, 2018 , American’s minimum fixed obligations under its capacity purchase agreements with third-party regional carriers are as follows (approximately, in millions): 2019 2020 2021 2022 2023 2024 and Thereafter Total Minimum fixed obligations under capacity purchase agreements with third-party regional carriers (1) $ 1,101 $ 930 $ 765 $ 618 $ 487 $ 1,043 $ 4,944 (1)

Supplemental Cash Flow Inform_2

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 2017 2016 Non-cash investing and financing activities: Equity investment $ — $ 120 $ — Settlement of bankruptcy obligations — 15 3 Supplemental information: Interest paid, net 1,091 1,040 964 Income taxes paid 18 20 16
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, 2018 2017 2016 Non-cash investing and financing activities: Equity investment $ — $ 120 $ — Settlement of bankruptcy obligations — 15 3 Supplemental information: Interest paid, net 1,009 942 867 Income taxes paid 16 18 14

Share-based Compensation (Table

Share-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 , 2017 and 2016 is as follows: Number of Shares Weighted Average Grant Date Fair Value (In thousands) 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 Granted 2,194 47.65 Vested and released (1,999 ) 44.99 Forfeited (199 ) 45.72 Outstanding at December 31, 2018 4,320 $ 44.29
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, 2018 , 2017 and 2016 is as follows: Number of Shares Weighted Average Grant Date Fair Value (In thousands) 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 Granted 2,194 47.65 Vested and released (1,999 ) 44.99 Forfeited (199 ) 45.72 Outstanding at December 31, 2018 4,320 $ 44.29

Valuation and Qualifying Acco_2

Valuation and Qualifying Accounts (Tables)	12 Months Ended
	Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Components of Valuation and Qualifying Accounts	Balance at Beginning of Year Additions Charged to Statement of Operations Accounts Deductions Balance at End of Year Allowance for obsolescence of spare parts Year ended December 31, 2018 $ 769 $ 70 $ (25 ) $ 814 Year ended December 31, 2017 765 29 (25 ) 769 Year ended December 31, 2016 728 37 — 765 Allowance for uncollectible accounts Year ended December 31, 2018 $ 24 $ 42 $ (37 ) $ 29 Year ended December 31, 2017 36 43 (55 ) 24 Year ended December 31, 2016 41 47 (52 ) 36
American Airlines, Inc. [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Components of Valuation and Qualifying Accounts	Balance at Beginning of Year Additions Charged to Statement of Operations Accounts Deductions Balance at End of Year Allowance for obsolescence of spare parts Year ended December 31, 2018 $ 717 $ 57 $ (20 ) $ 754 Year ended December 31, 2017 720 18 (21 ) 717 Year ended December 31, 2016 689 28 3 720 Allowance for uncollectible accounts Year ended December 31, 2018 $ 21 $ 39 $ (36 ) $ 24 Year ended December 31, 2017 35 41 (55 ) 21 Year ended December 31, 2016 37 47 (49 ) 35

Quarterly Financial Data (Una_2

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
Selected Quarterly Financial Information [Line Items]
Summarized Financial Data	Unaudited summarized financial data by quarter for 2018 and 2017 (in millions, except share and per share amounts): First Quarter Second Quarter Third Quarter Fourth Quarter 2018 (1) Operating revenues $ 10,401 $ 11,643 $ 11,559 $ 10,938 Operating expenses 10,005 10,639 10,874 10,367 Operating income 396 1,004 685 571 Net income 159 556 372 325 Earnings per share: Basic $ 0.34 $ 1.20 $ 0.81 $ 0.71 Diluted $ 0.34 $ 1.20 $ 0.81 $ 0.70 Shares used for computation (in thousands): Basic 472,297 463,533 460,526 460,589 Diluted 474,598 464,618 461,507 461,915 2017 Operating revenues $ 9,820 $ 11,227 $ 10,965 $ 10,611 Operating expenses 9,083 9,628 9,709 9,973 Operating income 737 1,599 1,256 638 Net income (loss) 340 864 661 (583 ) Earnings (loss) per share: Basic $ 0.67 $ 1.76 $ 1.36 $ (1.22 ) Diluted $ 0.67 $ 1.75 $ 1.36 $ (1.22 ) Shares used for computation (in thousands): Basic 503,902 490,818 484,772 477,165 Diluted 507,797 492,965 486,625 477,165 (1) In the fourth quarter of 2018, we adopted the New Lease Standard as of January 1, 2018. In accordance with the New Lease Standard, prior 2018 periods have been recast to reflect the effects of this adoption. See Note 1(b) and Note 6 for further discussion of the New Lease Standard.
American Airlines, Inc. [Member]
Selected Quarterly Financial Information [Line Items]
Summarized Financial Data	Unaudited summarized financial data by quarter for 2018 and 2017 (in millions): First Quarter Second Quarter Third Quarter Fourth Quarter 2018 (1) Operating revenues $ 10,398 $ 11,640 $ 11,556 $ 10,936 Operating expenses 9,986 10,626 10,850 10,344 Operating income 412 1,014 706 592 Net income 209 609 433 407 2017 Operating revenues $ 9,817 $ 11,224 $ 10,962 $ 10,607 Operating expenses 9,077 9,633 9,713 9,982 Operating income 740 1,591 1,249 625 Net income (loss) 369 888 686 (658 ) (1) In the fourth quarter of 2018, American adopted the New Lease Standard as of January 1, 2018. In accordance with the New Lease Standard, prior 2018 periods have been recast to reflect the effects of this adoption. See Note 1(b) and Note 4 for further discussion of the New Lease Standard.

Transactions with Related Par_2

Transactions with Related Parties (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 2017 AAG (1) $ 12,808 $ 10,968 AAG’s wholly-owned subsidiaries (2) (2,142 ) (2,146 ) Total $ 10,666 $ 8,822 (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 Sum_4

Basis of Presentation and Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018	Jan. 01, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities	$ 9,556								$ 9,556
Operating lease right-of-use assets	9,151				$ 0				9,151	$ 0
Restricted cash included in restricted cash and short-term investments	11				103				11	103	$ 113
Operating revenues:
Total operating revenues	10,938	$ 11,559	$ 11,643	$ 10,401	10,611	$ 10,965	$ 11,227	$ 9,820	44,541	42,622	40,142
Total operating expenses	10,367	10,874	10,639	10,005	9,973	9,709	9,628	9,083	41,885	38,391	35,082
Operating income	571	685	1,004	396	638	1,256	1,599	737	2,656	4,231	5,060
Total nonoperating expense, net									(772)	(836)	(908)
Income before income taxes									1,884	3,395	4,152
Income tax provision									472	2,113	1,568
Net income	$ 325	$ 372	$ 556	$ 159	$ (583)	$ 661	$ 864	$ 340	$ 1,412	$ 1,282	$ 2,584
Diluted earnings per common share (in dollars per share)	$ 0.70	$ 0.81	$ 1.20	$ 0.34	$ (1.22)	$ 1.36	$ 1.75	$ 0.67	$ 3.03	$ 2.61	$ 4.65
Impact of Tax Act, charge to reduce deferred tax assets					$ 823				$ 0	$ 823	$ 0
Deferred tax asset	$ 1,145				1,816				1,145	1,816
Noncurrent loyalty program liability	5,272				5,701				5,272	5,701
Total stockholders’ equity (deficit)	(169)				(780)				(169)	(780)	(284)			$ 5,635
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities												$ 10,000
Operating lease right-of-use assets												10,000
Cumulative effect adjustment												197
Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment												60
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment													$ (3,977)
American Airlines, Inc. [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities	9,496								9,496
Operating lease right-of-use assets	9,094				0				9,094	0
Restricted cash included in restricted cash and short-term investments	11				103				11	103	113
Operating revenues:
Total operating revenues	10,936	$ 11,556	$ 11,640	$ 10,398	10,607	$ 10,962	$ 11,224	$ 9,817	44,530	42,610	40,125
Total operating expenses	10,344	10,850	10,626	9,986	9,982	9,713	9,633	9,077	41,807	38,405	35,045
Operating income	592	706	1,014	412	625	1,249	1,591	740	2,723	4,205	5,080
Total nonoperating expense, net									(531)	(650)	(784)
Income before income taxes									2,192	3,555	4,296
Income tax provision									534	2,270	1,607
Net income	407	$ 433	$ 609	$ 209	(658)	$ 686	$ 888	$ 369	1,658	1,285	2,689
Impact of Tax Act, charge to reduce deferred tax assets					924				0	924	0
Deferred tax asset	1,280				2,071				1,280	2,071
Noncurrent loyalty program liability	5,272				5,701				5,272	5,701
Total stockholders’ equity (deficit)	11,770				9,888				11,770	9,888	8,580			9,698
American Airlines, Inc. [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities												10,000
Operating lease right-of-use assets												10,000
Cumulative effect adjustment												197
American Airlines, Inc. [Member] | Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment												60
American Airlines, Inc. [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment													(3,977)
Previously Reported [Member]
Operating revenues:
Total operating revenues										42,207	40,180
Total operating expenses										38,149	34,896
Operating income										4,058	5,284
Total nonoperating expense, net										(974)	(985)
Income before income taxes										3,084	4,299
Income tax provision										1,165	1,623
Net income										$ 1,919	$ 2,676
Diluted earnings per common share (in dollars per share)										$ 3.90	$ 4.81
Deferred tax asset					427					$ 427
Total stockholders’ equity (deficit)					3,926					3,926
Previously Reported [Member] | American Airlines, Inc. [Member]
Operating revenues:
Total operating revenues										42,195	$ 40,163
Total operating expenses										38,163	34,859
Operating income										4,032	5,304
Total nonoperating expense, net										(788)	(861)
Income before income taxes										3,244	4,443
Income tax provision										1,322	1,662
Net income										1,922	2,781
Deferred tax asset					682					682
Total stockholders’ equity (deficit)					14,594					14,594
Restatement Adjustment [Member] | Accounting Standards Update 2014-09 [Member]
Operating revenues:
Deferred tax asset					1,389					1,389
Total stockholders’ equity (deficit)					(4,706)					(4,706)
Restatement Adjustment [Member] | Accounting Standards Update 2014-09, Deferred Revenue Method [Member]
Operating revenues:
Total operating revenues										311	(147)
Operating income										311	(147)
Income before income taxes										311	(147)
Income tax provision										948	(55)
Net income										(637)	(92)
Restatement Adjustment [Member] | Accounting Standards Update 2014-09, Gross Versus Net Presentation [Member]
Operating revenues:
Total operating revenues										104	109
Total operating expenses										104	109
Restatement Adjustment [Member] | Accounting Standards Update 2017-07 [Member]
Operating revenues:
Total operating expenses										138	77
Operating income										(138)	(77)
Total nonoperating expense, net										138	77
Restatement Adjustment [Member] | American Airlines, Inc. [Member] | Accounting Standards Update 2014-09 [Member]
Operating revenues:
Deferred tax asset					1,389					1,389
Total stockholders’ equity (deficit)					(4,706)					(4,706)
Restatement Adjustment [Member] | American Airlines, Inc. [Member] | Accounting Standards Update 2014-09, Deferred Revenue Method [Member]
Operating revenues:
Total operating revenues										311	(147)
Operating income										311	(147)
Income before income taxes										311	(147)
Income tax provision										948	(55)
Net income										(637)	(92)
Restatement Adjustment [Member] | American Airlines, Inc. [Member] | Accounting Standards Update 2014-09, Gross Versus Net Presentation [Member]
Operating revenues:
Total operating revenues										104	109
Total operating expenses										104	109
Restatement Adjustment [Member] | American Airlines, Inc. [Member] | Accounting Standards Update 2017-07 [Member]
Operating revenues:
Total operating expenses										138	77
Operating income										(138)	(77)
Total nonoperating expense, net										138	77
Passenger [Member]
Operating revenues:
Total operating revenues									40,676	39,131	37,045
Passenger [Member] | American Airlines, Inc. [Member]
Operating revenues:
Total operating revenues									40,676	39,131	37,045
Passenger [Member] | Previously Reported [Member]
Operating revenues:
Total operating revenues										36,133	34,579
Passenger [Member] | Previously Reported [Member] | American Airlines, Inc. [Member]
Operating revenues:
Total operating revenues										36,133	34,579
Passenger [Member] | Restatement Adjustment [Member] | Accounting Standards Update 2014-09, Deferred Revenue Method [Member]
Operating revenues:
Total operating revenues										311	(147)
Passenger [Member] | Restatement Adjustment [Member] | Accounting Standards Update 2014-09, Ancillary Revenue Reclassifications [Member]
Operating revenues:
Total operating revenues										2,648	2,571
Passenger [Member] | Restatement Adjustment [Member] | Accounting Standards Update 2014-09, Gross Versus Net Presentation [Member]
Operating revenues:
Total operating revenues										39	42
Passenger [Member] | Restatement Adjustment [Member] | American Airlines, Inc. [Member] | Accounting Standards Update 2014-09, Deferred Revenue Method [Member]
Operating revenues:
Total operating revenues										311	(147)
Passenger [Member] | Restatement Adjustment [Member] | American Airlines, Inc. [Member] | Accounting Standards Update 2014-09, Ancillary Revenue Reclassifications [Member]
Operating revenues:
Total operating revenues										2,648	2,571
Passenger [Member] | Restatement Adjustment [Member] | American Airlines, Inc. [Member] | Accounting Standards Update 2014-09, Gross Versus Net Presentation [Member]
Operating revenues:
Total operating revenues										39	42
Cargo [Member]
Operating revenues:
Total operating revenues									1,013	890	785
Cargo [Member] | American Airlines, Inc. [Member]
Operating revenues:
Total operating revenues									1,013	890	785
Cargo [Member] | Previously Reported [Member]
Operating revenues:
Total operating revenues										800	700
Cargo [Member] | Previously Reported [Member] | American Airlines, Inc. [Member]
Operating revenues:
Total operating revenues										800	700
Cargo [Member] | Restatement Adjustment [Member] | Accounting Standards Update 2014-09, Ancillary Revenue Reclassifications [Member]
Operating revenues:
Total operating revenues										42	36
Cargo [Member] | Restatement Adjustment [Member] | Accounting Standards Update 2014-09, Gross Versus Net Presentation [Member]
Operating revenues:
Total operating revenues										48	49
Cargo [Member] | Restatement Adjustment [Member] | American Airlines, Inc. [Member] | Accounting Standards Update 2014-09, Ancillary Revenue Reclassifications [Member]
Operating revenues:
Total operating revenues										42	36
Cargo [Member] | Restatement Adjustment [Member] | American Airlines, Inc. [Member] | Accounting Standards Update 2014-09, Gross Versus Net Presentation [Member]
Operating revenues:
Total operating revenues										48	49
Other [Member]
Operating revenues:
Total operating revenues									2,852	2,601	2,312
Other [Member] | American Airlines, Inc. [Member]
Operating revenues:
Total operating revenues									2,841	2,589	2,295
Other [Member] | Previously Reported [Member]
Operating revenues:
Total operating revenues										5,274	4,901
Other [Member] | Previously Reported [Member] | American Airlines, Inc. [Member]
Operating revenues:
Total operating revenues										5,262	4,884
Other [Member] | Restatement Adjustment [Member] | Accounting Standards Update 2014-09, Ancillary Revenue Reclassifications [Member]
Operating revenues:
Total operating revenues										(2,690)	(2,607)
Other [Member] | Restatement Adjustment [Member] | Accounting Standards Update 2014-09, Gross Versus Net Presentation [Member]
Operating revenues:
Total operating revenues										17	18
Other [Member] | Restatement Adjustment [Member] | American Airlines, Inc. [Member] | Accounting Standards Update 2014-09, Ancillary Revenue Reclassifications [Member]
Operating revenues:
Total operating revenues										(2,690)	(2,607)
Other [Member] | Restatement Adjustment [Member] | American Airlines, Inc. [Member] | Accounting Standards Update 2014-09, Gross Versus Net Presentation [Member]
Operating revenues:
Total operating revenues										17	18
Air traffic [Member]
Operating revenues:
Customer liabilities	4,339				4,042				4,339	4,042
Air traffic [Member] | American Airlines, Inc. [Member]
Operating revenues:
Customer liabilities	4,339				4,042				4,339	4,042
Air traffic [Member] | Previously Reported [Member]
Operating revenues:
Customer liabilities					3,978					3,978
Air traffic [Member] | Previously Reported [Member] | American Airlines, Inc. [Member]
Operating revenues:
Customer liabilities					3,978					3,978
Air traffic [Member] | Restatement Adjustment [Member] | Accounting Standards Update 2014-09 [Member]
Operating revenues:
Customer liabilities					64					64
Air traffic [Member] | Restatement Adjustment [Member] | American Airlines, Inc. [Member] | Accounting Standards Update 2014-09 [Member]
Operating revenues:
Customer liabilities					64					64
Loyalty program [Member]
Operating revenues:
Customer liabilities	3,267				3,121				3,267	3,121
Noncurrent loyalty program liability					5,701					5,701
Loyalty program [Member] | American Airlines, Inc. [Member]
Operating revenues:
Customer liabilities	3,267				3,121				3,267	3,121
Noncurrent loyalty program liability					5,701					5,701
Loyalty program [Member] | Previously Reported [Member]
Operating revenues:
Customer liabilities					2,791					2,791
Noncurrent loyalty program liability					0					0
Loyalty program [Member] | Previously Reported [Member] | American Airlines, Inc. [Member]
Operating revenues:
Customer liabilities					2,791					2,791
Noncurrent loyalty program liability					0					0
Loyalty program [Member] | Restatement Adjustment [Member] | Accounting Standards Update 2014-09 [Member]
Operating revenues:
Customer liabilities					330					330
Noncurrent loyalty program liability					5,701					5,701
Loyalty program [Member] | Restatement Adjustment [Member] | American Airlines, Inc. [Member] | Accounting Standards Update 2014-09 [Member]
Operating revenues:
Customer liabilities					330					330
Noncurrent loyalty program liability					5,701					5,701
Retained Earnings (Deficit) [Member]
Operating revenues:
Net income									1,412	1,282	2,584
Total stockholders’ equity (deficit)	136				(1,345)				136	(1,345)	(2,429)			(1,230)
Retained Earnings (Deficit) [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment												197
Retained Earnings (Deficit) [Member] | Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment												60
Retained Earnings (Deficit) [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment													(3,977)
Retained Earnings (Deficit) [Member] | American Airlines, Inc. [Member]
Operating revenues:
Net income									1,658	1,285	2,689
Total stockholders’ equity (deficit)	$ 338				$ (1,577)				$ 338	$ (1,577)	$ (2,862)			$ (1,992)
Retained Earnings (Deficit) [Member] | American Airlines, Inc. [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment												197
Retained Earnings (Deficit) [Member] | American Airlines, Inc. [Member] | Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment												$ 60
Retained Earnings (Deficit) [Member] | American Airlines, Inc. [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment													$ (3,977)

Basis of Presentation and Sum_5

Basis of Presentation and Summary of Significant Accounting Policies - Operating Property and Equipment (Detail) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Depreciation	$ 2.4	$ 2.2	$ 1.9
Minimum [Member] | Aircraft, engines and related rotable parts [Member]
Property, Plant and Equipment [Line Items]
Residual value percentage of equipment and properties	5.00%
Estimated useful life	20 years
Minimum [Member] | Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Minimum [Member] | Furniture, fixtures and other equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Minimum [Member] | Capitalized software [Member]
Property, Plant and Equipment [Line Items]
Estimated useful 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%
Estimated useful life	30 years
Maximum [Member] | Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	30 years
Maximum [Member] | Furniture, fixtures and other equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Maximum [Member] | Capitalized software [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
American Airlines, Inc. [Member]
Property, Plant and Equipment [Line Items]
Depreciation	$ 2.4	$ 2.1	$ 1.8
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%
Estimated useful life	20 years
American Airlines, Inc. [Member] | Minimum [Member] | Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
American Airlines, Inc. [Member] | Minimum [Member] | Furniture, fixtures and other equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
American Airlines, Inc. [Member] | Minimum [Member] | Capitalized software [Member]
Property, Plant and Equipment [Line Items]
Estimated useful 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%
Estimated useful life	30 years
American Airlines, Inc. [Member] | Maximum [Member] | Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	30 years
American Airlines, Inc. [Member] | Maximum [Member] | Furniture, fixtures and other equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
American Airlines, Inc. [Member] | Maximum [Member] | Capitalized software [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years

Basis of Presentation and Sum_6

Basis of Presentation and Summary of Significant Accounting Policies - Finite-Lived Intangible Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	$ (663)	$ (622)
Total	279	320
American Airlines, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization	(663)	(622)
Total	279	320
Domestic airport slots [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 365	365
Useful life of intangible assets	25 years
Domestic airport slots [Member] | American Airlines, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 365	365
Useful life of intangible assets	25 years
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 300	300
Useful life of intangible assets	9 years
Customer relationships [Member] | American Airlines, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 300	300
Useful life of intangible assets	9 years
Marketing agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 105	105
Useful life of intangible assets	30 years
Marketing agreements [Member] | American Airlines, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 105	105
Useful life of intangible assets	30 years
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
Useful life of intangible assets	25 years
Airport gate leasehold rights [Member] | American Airlines, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable intangible assets, gross	$ 137	$ 137
Useful life of intangible assets	25 years

Basis of Presentation and Sum_7

Basis of Presentation and Summary of Significant Accounting Policies - Finite-Lived Intangible Assets Amortization Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 41	$ 44	$ 76
2,019	41
2,020	41
2,021	41
2,022	41
2,023	7
2024 and thereafter	108
Total	279	320
American Airlines, Inc. [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense	41	44	$ 76
2,019	41
2,020	41
2,021	41
2,022	41
2,023	7
2024 and thereafter	108
Total	$ 279	$ 320

Basis of Presentation and Sum_8

Basis of Presentation and Summary of Significant Accounting Policies - Significant Categories of Reported Operating Revenues (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue from External Customer [Line Items]
Total operating revenues	$ 10,938	$ 11,559	$ 11,643	$ 10,401	$ 10,611	$ 10,965	$ 11,227	$ 9,820	$ 44,541	$ 42,622	$ 40,142
Passenger [Member]
Revenue from External Customer [Line Items]
Total operating revenues									40,676	39,131	37,045
Passenger travel [Member]
Revenue from External Customer [Line Items]
Total operating revenues									37,457	36,152	34,278
Loyalty revenue - travel [Member]
Revenue from External Customer [Line Items]
Total operating revenues									3,219	2,979	2,767
Cargo [Member]
Revenue from External Customer [Line Items]
Total operating revenues									1,013	890	785
Other [Member]
Revenue from External Customer [Line Items]
Total operating revenues									2,852	2,601	2,312
Loyalty revenue - marketing services [Member]
Revenue from External Customer [Line Items]
Total operating revenues									2,352	2,124	1,872
Other revenue [Member]
Revenue from External Customer [Line Items]
Total operating revenues									500	477	440
American Airlines, Inc. [Member]
Revenue from External Customer [Line Items]
Total operating revenues	$ 10,936	$ 11,556	$ 11,640	$ 10,398	$ 10,607	$ 10,962	$ 11,224	$ 9,817	44,530	42,610	40,125
American Airlines, Inc. [Member] | Passenger [Member]
Revenue from External Customer [Line Items]
Total operating revenues									40,676	39,131	37,045
American Airlines, Inc. [Member] | Passenger travel [Member]
Revenue from External Customer [Line Items]
Total operating revenues									37,457	36,152	34,278
American Airlines, Inc. [Member] | Loyalty revenue - travel [Member]
Revenue from External Customer [Line Items]
Total operating revenues									3,219	2,979	2,767
American Airlines, Inc. [Member] | Cargo [Member]
Revenue from External Customer [Line Items]
Total operating revenues									1,013	890	785
American Airlines, Inc. [Member] | Other [Member]
Revenue from External Customer [Line Items]
Total operating revenues									2,841	2,589	2,295
American Airlines, Inc. [Member] | Loyalty revenue - marketing services [Member]
Revenue from External Customer [Line Items]
Total operating revenues									2,352	2,124	1,872
American Airlines, Inc. [Member] | Other revenue [Member]
Revenue from External Customer [Line Items]
Total operating revenues									$ 489	$ 465	$ 423

Basis of Presentation and Sum_9

Basis of Presentation and Summary of Significant Accounting Policies - Passenger Revenue by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Airline Destination Disclosure [Line Items]
Operating revenues	$ 10,938	$ 11,559	$ 11,643	$ 10,401	$ 10,611	$ 10,965	$ 11,227	$ 9,820	$ 44,541	$ 42,622	$ 40,142
Passenger [Member]
Airline Destination Disclosure [Line Items]
Operating revenues									40,676	39,131	37,045
Passenger [Member] | Domestic [Member]
Airline Destination Disclosure [Line Items]
Operating revenues									29,573	28,749	27,202
Passenger [Member] | Latin America [Member]
Airline Destination Disclosure [Line Items]
Operating revenues									5,125	4,840	4,676
Passenger [Member] | Atlantic [Member]
Airline Destination Disclosure [Line Items]
Operating revenues									4,376	4,028	3,873
Passenger [Member] | Pacific [Member]
Airline Destination Disclosure [Line Items]
Operating revenues									1,602	1,514	1,294
American Airlines, Inc. [Member]
Airline Destination Disclosure [Line Items]
Operating revenues	$ 10,936	$ 11,556	$ 11,640	$ 10,398	$ 10,607	$ 10,962	$ 11,224	$ 9,817	44,530	42,610	40,125
American Airlines, Inc. [Member] | Passenger [Member]
Airline Destination Disclosure [Line Items]
Operating revenues									40,676	39,131	37,045
American Airlines, Inc. [Member] | Passenger [Member] | Domestic [Member]
Airline Destination Disclosure [Line Items]
Operating revenues									29,573	28,749	27,202
American Airlines, Inc. [Member] | Passenger [Member] | Latin America [Member]
Airline Destination Disclosure [Line Items]
Operating revenues									5,125	4,840	4,676
American Airlines, Inc. [Member] | Passenger [Member] | Atlantic [Member]
Airline Destination Disclosure [Line Items]
Operating revenues									4,376	4,028	3,873
American Airlines, Inc. [Member] | Passenger [Member] | Pacific [Member]
Airline Destination Disclosure [Line Items]
Operating revenues									$ 1,602	$ 1,514	$ 1,294

Basis of Presentation and Su_10

Basis of Presentation and Summary of Significant Accounting Policies - Significant Contract Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Contract balances, liability	$ 12,878	$ 12,864
Loyalty program [Member]
Disaggregation of Revenue [Line Items]
Contract balances, liability	8,539	8,822
Air traffic [Member]
Disaggregation of Revenue [Line Items]
Contract balances, liability	4,339	4,042
American Airlines, Inc. [Member]
Disaggregation of Revenue [Line Items]
Contract balances, liability	12,878	12,864
American Airlines, Inc. [Member] | Loyalty program [Member]
Disaggregation of Revenue [Line Items]
Contract balances, liability	8,539	8,822
American Airlines, Inc. [Member] | Air traffic [Member]
Disaggregation of Revenue [Line Items]
Contract balances, liability	$ 4,339	$ 4,042

Basis of Presentation and Su_11

Basis of Presentation and Summary of Significant Accounting Policies - Changes in Loyalty Program Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	$ 12,864
Ending balance	12,878
Loyalty program [Member]
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	8,822
Deferral of revenue	3,083
Recognition of revenue	(3,366)
Ending balance	$ 8,539
Inactive period before expiration of mileage credits	18 months
Customer liabilities	$ 3,267	$ 3,121
American Airlines, Inc. [Member]
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	12,864
Ending balance	12,878
American Airlines, Inc. [Member] | Loyalty program [Member]
Movement In Contract With Customer, Liability [Roll Forward]
Beginning balance	8,822
Deferral of revenue	3,083
Recognition of revenue	(3,366)
Ending balance	$ 8,539
Inactive period before expiration of mileage credits	18 months
Customer liabilities	$ 3,267	$ 3,121

Basis of Presentation and Su_12

Basis of Presentation and Summary of Significant Accounting Policies - Regional Expenses (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Regional Expenses [Line Items]
Aircraft fuel and related taxes	$ 8,053	$ 6,128	$ 5,071
Salaries, wages and benefits	12,251	11,954	10,967
Maintenance, materials and repairs	2,050	1,959	1,834
Other rent and landing fees	1,900	1,806	1,772
Aircraft rent	1,264	1,197	1,203
Selling expenses	1,520	1,477	1,323
Depreciation and amortization	1,839	1,702	1,525
Other	5,088	4,910	4,634
Total regional expenses	$ 7,133	6,546	6,044
Republic Holdings [Member]
Regional Expenses [Line Items]
Ownership interest	25.00%
Regional Carrier [Member]
Regional Expenses [Line Items]
Aircraft fuel and related taxes	$ 1,843	1,382	1,109
Salaries, wages and benefits	1,591	1,452	1,333
Capacity purchases from third-party regional carriers	1,431	1,581	1,538
Maintenance, materials and repairs	340	281	345
Other rent and landing fees	610	625	564
Aircraft rent	32	35	36
Selling expenses	369	361	347
Depreciation and amortization	318	315	301
Special items, net	6	22	14
Other	593	492	457
Total regional expenses	7,133	6,546	6,044
Regional Carrier [Member] | Republic [Member]
Regional Expenses [Line Items]
Capacity purchases from third-party regional carriers	565
American Airlines, Inc. [Member]
Regional Expenses [Line Items]
Aircraft fuel and related taxes	8,053	6,128	5,071
Salaries, wages and benefits	12,240	11,942	10,958
Maintenance, materials and repairs	2,050	1,959	1,834
Other rent and landing fees	1,900	1,806	1,772
Aircraft rent	1,264	1,197	1,203
Selling expenses	1,520	1,477	1,323
Depreciation and amortization	1,839	1,702	1,525
Other	5,090	4,910	4,641
Total regional expenses	$ 7,064	6,572	6,009
American Airlines, Inc. [Member] | Republic Holdings [Member]
Regional Expenses [Line Items]
Ownership interest	25.00%
American Airlines, Inc. [Member] | Regional Carrier [Member]
Regional Expenses [Line Items]
Aircraft fuel and related taxes	$ 1,843	1,382	1,109
Salaries, wages and benefits	338	356	327
Capacity purchases from third-party regional carriers	3,267	3,283	3,186
Maintenance, materials and repairs	8	7	4
Other rent and landing fees	583	602	487
Aircraft rent	27	27	28
Selling expenses	369	361	347
Depreciation and amortization	267	262	237
Special items, net	0	3	13
Other	362	289	271
Total regional expenses	7,064	$ 6,572	$ 6,009
American Airlines, Inc. [Member] | Regional Carrier [Member] | Republic [Member]
Regional Expenses [Line Items]
Capacity purchases from third-party regional carriers	$ 565

Basis of Presentation and Su_13

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018USD ($)$ / shares	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)$ / shares	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2018USD ($)componentReporting_Unit$ / shares	Dec. 31, 2017USD ($)$ / shares	Dec. 31, 2016USD ($)
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Common stock, par value (in dollars per share) | $ / shares	$ 0.01				$ 0.01				$ 0.01	$ 0.01
Consolidated reporting unit | Reporting_Unit									1
Goodwill impairment									$ 0
Goodwill	$ 4,091				$ 4,091				4,091	$ 4,091
Indefinite lived intangible assets	1,900				1,900				1,900	1,900
Impairment of intangible assets, indefinite-lived (excluding goodwill)			$ 26
Operating revenues	$ 10,938	$ 11,559	11,643	$ 10,401	$ 10,611	$ 10,965	$ 11,227	$ 9,820	$ 44,541	42,622	$ 40,142
Contract receivables settlement duration									7 days
Advertising expense									$ 128	135	116
Foreign currency gains (losses)									$ (55)	(4)	1
Loyalty program [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Contract term									one to nine
Payment term									30 days
Number of revenue components | component									2
Recognition of revenue									$ 3,366
Loyalty revenue - marketing services [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Operating revenues									$ 2,352	$ 2,124	1,872
Air traffic [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Contract term									one year
Recognition of revenue									$ 3,100
American Airlines, Inc. [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Common stock, par value (in dollars per share) | $ / shares	$ 1				$ 1				$ 1	$ 1
Consolidated reporting unit | Reporting_Unit									1
Goodwill impairment									$ 0
Goodwill	$ 4,091				$ 4,091				4,091	$ 4,091
Indefinite lived intangible assets	1,900				1,900				1,900	1,900
Impairment of intangible assets, indefinite-lived (excluding goodwill)			26
Operating revenues	$ 10,936	$ 11,556	$ 11,640	$ 10,398	$ 10,607	$ 10,962	$ 11,224	$ 9,817	$ 44,530	42,610	40,125
Contract receivables settlement duration									7 days
Advertising expense									$ 128	135	116
Foreign currency gains (losses)									$ (54)	(4)	1
American Airlines, Inc. [Member] | Loyalty program [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Contract term									one to nine years
Payment term									30 days
Number of revenue components | component									2
Recognition of revenue									$ 3,366
American Airlines, Inc. [Member] | Loyalty revenue - marketing services [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Operating revenues									$ 2,352	$ 2,124	$ 1,872
American Airlines, Inc. [Member] | Air traffic [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Contract term									one year
Recognition of revenue									$ 3,100

Special Items, Net (Details)

Special Items, Net (Details) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)$ / Employees	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)$ / Employees	Dec. 31, 2016USD ($)
Restructuring Cost and Reserve [Line Items]
Fleet restructuring expenses	$ 146	$ 58	$ 422	$ 232	$ 177
Merger integration expenses	81	81	268	273	514
Severance expenses	37		58	0	0
Litigation settlement			45	0	0
Intangible asset impairment			26	0	0
Labor contract expenses			13	46	0
Mark-to-market adjustments for bankruptcy obligations, net	(37)	20	(76)	27	25
Employee 2017 Tax Act bonus expense		149
Other operating charges (credits), net			31	11	(7)
Mainline operating special items, net			787	712	709
Regional operating special items, net			6	22	14
Operating special items, net			793	734	723
Mark-to-market adjustments on equity investments, net	22		104	0	0
Debt refinancing and extinguishment charges			13	22	49
Other nonoperating credits, net			(4)	0	0
Nonoperating special items, net			113	22	49
Income tax special items			18	0	0
Impact of the 2017 Tax Act		$ 823	0	823	0
Income tax special items, net			18	823	0
Tax reform bonus, amount per employee | $ / Employees		1,000
American Airlines, Inc. [Member]
Restructuring Cost and Reserve [Line Items]
Fleet restructuring expenses	146	$ 58	422	232	177
Merger integration expenses	81	81	268	273	514
Severance expenses	37		58	0	0
Litigation settlement			45	0	0
Intangible asset impairment			26	0	0
Labor contract expenses			13	46	0
Mark-to-market adjustments for bankruptcy obligations, net	(37)	20	(76)	27	25
Employee 2017 Tax Act bonus expense		123
Other operating charges (credits), net			31	11	(7)
Mainline operating special items, net			787	712	709
Regional operating special items, net			0	3	13
Operating special items, net			787	715	722
Mark-to-market adjustments on equity investments, net	$ 22		104	0	0
Debt refinancing and extinguishment charges			13	22	49
Other nonoperating credits, net			(4)	0	0
Nonoperating special items, net			113	22	49
Income tax special items			18	0	0
Impact of the 2017 Tax Act		$ 924	0	924	0
Income tax special items, net			18	924	0
Tax reform bonus, amount per employee | $ / Employees		1,000
Foreign Tax Authority [Member]
Restructuring Cost and Reserve [Line Items]
Income tax special items, net			18
Foreign Tax Authority [Member] | American Airlines, Inc. [Member]
Restructuring Cost and Reserve [Line Items]
Income tax special items, net			18
Mainline [Member]
Restructuring Cost and Reserve [Line Items]
Employee 2017 Tax Act bonus expense			0	$ 123	0
Tax reform bonus, amount per employee | $ / Employees				1,000
Mainline [Member] | American Airlines, Inc. [Member]
Restructuring Cost and Reserve [Line Items]
Employee 2017 Tax Act bonus expense			$ 0	$ 123	$ 0
Tax reform bonus, amount per employee | $ / Employees				1,000

Earnings Per Common Share (Deta

Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Basic EPS:
Net income	$ 325	$ 372	$ 556	$ 159	$ (583)	$ 661	$ 864	$ 340	$ 1,412	$ 1,282	$ 2,584
Weighted average common shares outstanding (in shares)	460,589	460,526	463,533	472,297	477,165	484,772	490,818	503,902	464,236	489,164	552,308
Basic EPS (in dollars per share)	$ 0.71	$ 0.81	$ 1.20	$ 0.34	$ (1.22)	$ 1.36	$ 1.76	$ 0.67	$ 3.04	$ 2.62	$ 4.68
Diluted EPS:
Net income for purposes of computing diluted EPS									$ 1,412	$ 1,282	$ 2,584
Share computation for diluted EPS:
Basic weighted average common shares outstanding (in shares)	460,589	460,526	463,533	472,297	477,165	484,772	490,818	503,902	464,236	489,164	552,308
Dilutive effect of stock awards (in shares)									1,424	2,528	3,791
Diluted weighted average common shares outstanding (in shares)	461,915	461,507	464,618	474,598	477,165	486,625	492,965	507,797	465,660	491,692	556,099
Diluted EPS (in dollars per share)	$ 0.70	$ 0.81	$ 1.20	$ 0.34	$ (1.22)	$ 1.36	$ 1.75	$ 0.67	$ 3.03	$ 2.61	$ 4.65
Restricted stock unit awards excluded from the calculation of diluted EPS because inclusion would be antidilutive (in shares)									1,266	328	1,429

Share Repurchase Programs and_2

Share Repurchase Programs and Dividends - Share Repurchase Programs (Details)	12 Months Ended			42 Months Ended	54 Months Ended
	Dec. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2016USD ($)$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2018USD ($)program	Apr. 30, 2018USD ($)
Equity, Class of Treasury Stock [Line Items]
Stock repurchase programs, authorized amount	$ 13,000,000,000				$ 13,000,000,000
Number of share repurchase programs authorized | program					7
Stock repurchased (in shares) | shares	16,606,157	33,900,000	119,823,621	278,900,000
Aggregate stock repurchase price	$ 799,000,000	$ 1,563,000,000	$ 4,416,000,000	$ 11,300,000,000
Average cost per share (in dollars per share) | $ / shares		$ 45.68	$ 36.86	$ 40.69
Share Repurchase Program April 2018 [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase programs, authorized amount						$ 2,000,000,000
Stock repurchase programs, remaining authorized amount	$ 1,700,000,000				$ 1,700,000,000
Stock repurchased (in shares) | shares	16,600,000
Aggregate stock repurchase price	$ 800,000,000
Average cost per share (in dollars per share) | $ / shares	$ 48.15

Share Repurchase Programs and_3

Share Repurchase Programs and Dividends - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended												12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 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, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Dividends declared on common stock (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	$ 0.4	$ 0.4	$ 0.4
Cash paid													$ 186	$ 198	$ 224

Debt - Components of Long-Term

Debt - Components of Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total long-term debt	$ 24,001	$ 24,530
Less: Total unamortized debt discount, premium and issuance costs	222	236
Less: Current maturities	3,213	2,476
Long-term debt, net of current maturities	20,566	21,818
Secured Debt [Member]
Debt Instrument [Line Items]
Total long-term debt	22,751	22,780
Secured Debt [Member] | 2013 Credit Facilities [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 1,825	1,825
Variable interest rate	4.26%
Secured Debt [Member] | 2014 Credit Facilities [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 1,215	728
Variable interest rate	4.39%
Secured Debt [Member] | April 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 980	990
Variable interest rate	4.52%
Secured Debt [Member] | December 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 1,225	1,238
Variable interest rate	4.46%
Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 11,648	11,881
Average interest rate	4.21%
Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Fixed interest rate	3.00%
Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Fixed interest rate	9.01%
Secured Debt [Member] | Equipment Loans and Other Notes Payable [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 5,060	5,259
Average interest rate	4.26%
Secured Debt [Member] | Equipment Loans and Other Notes Payable [Member] | Minimum [Member]
Debt Instrument [Line Items]
Fixed interest rate	2.34%
Secured Debt [Member] | Equipment Loans and Other Notes Payable [Member] | Maximum [Member]
Debt Instrument [Line Items]
Fixed interest rate	8.48%
Secured Debt [Member] | Special Facility Revenue Bonds [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 798	857
Secured Debt [Member] | Special Facility Revenue Bonds [Member] | Minimum [Member]
Debt Instrument [Line Items]
Fixed interest rate	5.00%
Secured Debt [Member] | Special Facility Revenue Bonds [Member] | Maximum [Member]
Debt Instrument [Line Items]
Fixed interest rate	8.00%
Secured Debt [Member] | Other Secured Obligations [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 0	2
Unsecured Debt [Member]
Debt Instrument [Line Items]
Total long-term debt	1,250	1,750
Unsecured Debt [Member] | Senior Notes 5.50% Due in 2019 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 750	750
Fixed interest rate	5.50%
Unsecured Debt [Member] | Senior Notes 4.625% Due in 2020 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 500	500
Fixed interest rate	4.625%
Unsecured Debt [Member] | Senior Notes 6.125% Due in 2018 [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 0	$ 500
Fixed interest rate		6.125%
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Total long-term debt	22,722
Less: Total unamortized debt discount, premium and issuance costs	219	$ 227
Less: Current maturities	2,466	1,980
Long-term debt, net of current maturities	20,037	20,543
American Airlines, Inc. [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Total long-term debt	22,722	22,750
American Airlines, Inc. [Member] | Secured Debt [Member] | 2013 Credit Facilities [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 1,825	1,825
Variable interest rate	4.26%
American Airlines, Inc. [Member] | Secured Debt [Member] | 2014 Credit Facilities [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 1,215	728
Variable interest rate	4.39%
American Airlines, Inc. [Member] | Secured Debt [Member] | April 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 980	990
Variable interest rate	4.52%
American Airlines, Inc. [Member] | Secured Debt [Member] | December 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 1,225	1,238
Variable interest rate	4.46%
American Airlines, Inc. [Member] | Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 11,648	11,881
Average interest rate	4.21%
American Airlines, Inc. [Member] | Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member] | Minimum [Member]
Debt Instrument [Line Items]
Fixed interest rate	3.00%
American Airlines, Inc. [Member] | Secured Debt [Member] | Enhanced Equipment Trust Certificates (EETC) [Member] | Maximum [Member]
Debt Instrument [Line Items]
Fixed interest rate	9.01%
American Airlines, Inc. [Member] | Secured Debt [Member] | Equipment Loans and Other Notes Payable [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 5,060	5,259
Average interest rate	4.26%
American Airlines, Inc. [Member] | Secured Debt [Member] | Equipment Loans and Other Notes Payable [Member] | Minimum [Member]
Debt Instrument [Line Items]
Fixed interest rate	2.34%
American Airlines, Inc. [Member] | Secured Debt [Member] | Equipment Loans and Other Notes Payable [Member] | Maximum [Member]
Debt Instrument [Line Items]
Fixed interest rate	8.48%
American Airlines, Inc. [Member] | Secured Debt [Member] | Special Facility Revenue Bonds [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 769	828
American Airlines, Inc. [Member] | Secured Debt [Member] | Special Facility Revenue Bonds [Member] | Minimum [Member]
Debt Instrument [Line Items]
Fixed interest rate	5.00%
American Airlines, Inc. [Member] | Secured Debt [Member] | Special Facility Revenue Bonds [Member] | Maximum [Member]
Debt Instrument [Line Items]
Fixed interest rate	5.00%
American Airlines, Inc. [Member] | Secured Debt [Member] | Other Secured Obligations [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 0	$ 1

Debt - Summary of Availability

Debt - Summary of Availability under Revolving Credit Facilities (Details) - Secured Debt [Member] - Revolving Credit Facility [Member]	Dec. 31, 2018USD ($)
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 2,842,500,000
2013 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	1,000,000,000
2014 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	1,542,500,000
April 2016 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	300,000,000
American Airlines, Inc. [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	2,842,500,000
American Airlines, Inc. [Member] | 2013 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	1,000,000,000
American Airlines, Inc. [Member] | 2014 Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	1,542,500,000
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

Debt - Schedule of Maturities o

Debt - Schedule of Maturities of Long-Term Debt and Capital Leases (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]
2,019	$ 3,258
2,020	2,320
2,021	3,411
2,022	1,346
2,023	3,894
2024 and thereafter	9,772
Total	24,001	$ 24,530
American Airlines, Inc. [Member]
Maturities of Long-term Debt and Capital Lease Obligations [Abstract]
2,019	2,508
2,020	1,815
2,021	3,409
2,022	1,344
2,023	3,892
2024 and thereafter	9,754
Total	$ 22,722

Debt - 2013, 2014 and 2016 Cred

Debt - 2013, 2014 and 2016 Credit Facilities (Details) - USD ($)	Nov. 30, 2018	Apr. 30, 2018	Dec. 31, 2018	May 31, 2018	Nov. 30, 2017	Oct. 31, 2017	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, net of current maturities			$ 20,566,000,000				$ 20,566,000,000		$ 21,818,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility undrawn fee percentage							0.625%
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] | 2013 Credit Facilities [Member]
Debt Instrument [Line Items]
Long-term debt, net of current maturities			1,825,000,000	$ 1,800,000,000			$ 1,825,000,000
Debt instrument principal amount			1,900,000,000				$ 1,900,000,000
Secured Debt [Member] | Term Loan Facility [Member] | 2013 Credit Facilities [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		2.00%		1.75%			1.75%
Secured Debt [Member] | Term Loan Facility [Member] | 2013 Credit Facilities [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%		0.75%
Secured Debt [Member] | Term Loan Facility [Member] | 2014 Credit Facilities [Member]
Debt Instrument [Line Items]
Long-term debt, net of current maturities			1,215,000,000				$ 1,215,000,000
Line of credit facility, incremental loan feature								$ 500,000,000
Debt instrument principal amount			1,250,000,000				$ 1,250,000,000
Secured Debt [Member] | Term Loan Facility [Member] | 2014 Credit Facilities [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate							2.00%
Secured Debt [Member] | Term Loan Facility [Member] | April 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
Long-term debt, net of current maturities			980,000,000				$ 980,000,000
Debt instrument principal amount			1,000,000,000				$ 1,000,000,000
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%
Secured Debt [Member] | Term Loan Facility [Member] | December 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
Long-term debt, net of current maturities			1,225,000,000		$ 1,300,000,000		$ 1,225,000,000
Debt instrument principal amount			1,250,000,000				$ 1,250,000,000
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			2,842,500,000				$ 2,842,500,000
Secured Debt [Member] | Revolving Credit Facility [Member] | 2013 Credit Facilities [Member]
Debt Instrument [Line Items]
Long-term debt, net of current maturities			0				0
Reduced commitments			200,000,000				200,000,000
Line of credit facility, maximum borrowing capacity			$ 1,000,000,000				$ 1,000,000,000
Secured Debt [Member] | Revolving Credit Facility [Member] | 2013 Credit Facilities [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%		2.00%				2.00%
Secured Debt [Member] | Revolving Credit Facility [Member] | 2013 Credit Facilities [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%		1.00%
Secured Debt [Member] | Revolving Credit Facility [Member] | 2014 Credit Facilities [Member]
Debt Instrument [Line Items]
Long-term debt, net of current maturities			$ 0				$ 0
Line of credit facility, incremental loan feature			543,000,000				543,000,000
Line of credit facility, maximum borrowing capacity			$ 1,542,500,000				$ 1,542,500,000
Secured Debt [Member] | Revolving Credit Facility [Member] | 2014 Credit Facilities [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%		2.00%				2.00%
Secured Debt [Member] | Revolving Credit Facility [Member] | 2014 Credit Facilities [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%		1.00%
Secured Debt [Member] | Revolving Credit Facility [Member] | April 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
Long-term debt, net of current maturities			$ 0				$ 0
Line of credit facility, maximum borrowing capacity			$ 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%		2.00%				2.00%
Secured Debt [Member] | Revolving Credit Facility [Member] | April 2016 Credit Facilities [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%		1.00%
Secured Debt [Member] | Letter of Credit [Member] | 2013 Credit Facilities [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 100,000,000				$ 100,000,000
Secured Debt [Member] | Letter of Credit [Member] | 2014 Credit Facilities [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			200,000,000				200,000,000
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Long-term debt, net of current maturities			20,037,000,000				$ 20,037,000,000		$ 20,543,000,000
American Airlines, Inc. [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility undrawn fee percentage							0.625%
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] | 2013 Credit Facilities [Member]
Debt Instrument [Line Items]
Long-term debt, net of current maturities				$ 1,800,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | 2013 Credit Facilities [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Long-term debt, net of current maturities			1,825,000,000				$ 1,825,000,000
Basis spread on variable rate		2.00%		1.75%			1.75%
Debt instrument principal amount			1,900,000,000				$ 1,900,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | 2013 Credit Facilities [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%		0.75%
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | 2014 Credit Facilities [Member]
Debt Instrument [Line Items]
Long-term debt, net of current maturities			1,200,000,000				1,200,000,000
Line of credit facility, incremental loan feature								$ 500,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | 2014 Credit Facilities [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Long-term debt, net of current maturities			1,215,000,000				$ 1,215,000,000
Basis spread on variable rate							2.00%
Debt instrument principal amount			1,250,000,000				$ 1,250,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | April 2016 Credit Facilities [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Long-term debt, net of current maturities			980,000,000				$ 980,000,000
Basis spread on variable rate							2.00%
Debt instrument principal amount			1,000,000,000				$ 1,000,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | December 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
Long-term debt, net of current maturities					$ 1,300,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Term Loan Facility [Member] | December 2016 Credit Facilities [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Long-term debt, net of current maturities			1,225,000,000				$ 1,225,000,000
Basis spread on variable rate					2.00%	2.50%	2.00%
Debt instrument principal amount			1,250,000,000				$ 1,250,000,000
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			2,842,500,000				2,842,500,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | 2013 Credit Facilities [Member]
Debt Instrument [Line Items]
Reduced commitments			200,000,000				200,000,000
Line of credit facility, maximum borrowing capacity			1,000,000,000				1,000,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | 2013 Credit Facilities [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Long-term debt, net of current maturities			$ 0				$ 0
Basis spread on variable rate	2.25%		2.00%				2.00%
Line of credit facility, maximum borrowing capacity			$ 1,000,000,000				$ 1,000,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | 2013 Credit Facilities [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%		1.00%
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | 2014 Credit Facilities [Member]
Debt Instrument [Line Items]
Line of credit facility, incremental loan feature			$ 543,000,000				543,000,000
Line of credit facility, maximum borrowing capacity			1,542,500,000				1,542,500,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | 2014 Credit Facilities [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Long-term debt, net of current maturities			$ 0				$ 0
Basis spread on variable rate	2.25%		2.00%				2.00%
Line of credit facility, maximum borrowing capacity			$ 1,542,500,000				$ 1,542,500,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | 2014 Credit Facilities [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%		1.00%
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
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, net of current maturities			$ 0				$ 0
Basis spread on variable rate	2.25%		2.00%				2.00%
Line of credit facility, maximum borrowing capacity			$ 300,000,000				$ 300,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Revolving Credit Facility [Member] | April 2016 Credit Facilities [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%		1.00%
American Airlines, Inc. [Member] | Secured Debt [Member] | Letter of Credit [Member] | 2013 Credit Facilities [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 100,000,000				100,000,000
American Airlines, Inc. [Member] | Secured Debt [Member] | Letter of Credit [Member] | 2014 Credit Facilities [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 200,000,000				$ 200,000,000

Debt - 2017-2 EETCs (Details)

Debt - 2017-2 EETCs (Details) - Enhanced Equipment Trust Certificates (EETC) [Member] - 2017-2 EETC [Member] $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Oct. 31, 2017USD ($)trust	Jun. 30, 2018USD ($)Aircraft	Dec. 31, 2017USD ($)Aircraft	Apr. 30, 2018Aircraft
Debt Instrument [Line Items]
Number of aircrafts financed through repurchased debt		6
Number of aircraft financed by debt issuance				30
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Number of pass through trusts issued | trust	3
Debt instrument principal amount | $	$ 1,000
Repayments of long-term debt | $		$ 283	$ 735
Number of aircrafts financed through repurchased debt		6	24
Number of aircraft financed by debt issuance				30

Debt - 2017-2 EETCs - Certain I

Debt - 2017-2 EETCs - Certain Information (Details) - Enhanced Equipment Trust Certificates (EETC) [Member]	Dec. 31, 2018USD ($)
2017-2 EETC - Series AA [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal issued	$ 545,000,000
Fixed interest rate	3.35%
2017-2 EETC - Series A [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal issued	$ 252,000,000
Fixed interest rate	3.60%
2017-2 EETC - Series B [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal issued	$ 221,000,000
Fixed interest rate	3.70%
American Airlines, Inc. [Member] | 2017-2 EETC - Series AA [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal issued	$ 545,000,000
Fixed interest rate	3.35%
American Airlines, Inc. [Member] | 2017-2 EETC - Series A [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal issued	$ 252,000,000
Fixed interest rate	3.60%
American Airlines, Inc. [Member] | 2017-2 EETC - Series B [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal issued	$ 221,000,000
Fixed interest rate	3.70%

Debt - 2012-2C(R) EETCs (Detail

Debt - 2012-2C(R) EETCs (Details) - Enhanced Equipment Trust Certificates (EETC) [Member]	Dec. 31, 2018USD ($)	May 15, 2018USD ($)	Jun. 06, 2013USD ($)Aircraft
2012-2 Class C(R) EETC [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 100,000,000	$ 100,000,000
Number of aircraft financed by debt issuance | Aircraft			11
Class C Certificates [Member]
Debt Instrument [Line Items]
Debt instrument principal amount			$ 100,000,000
American Airlines, Inc. [Member] | 2012-2 Class C(R) EETC [Member]
Debt Instrument [Line Items]
Debt instrument principal amount	$ 100,000,000	$ 100,000,000
Number of aircraft financed by debt issuance | Aircraft			11
American Airlines, Inc. [Member] | Class C Certificates [Member]
Debt Instrument [Line Items]
Debt instrument principal amount			$ 100,000,000

Debt - 2012-2C(R) EETCs - Certa

Debt - 2012-2C(R) EETCs - Certain Information (Details) - Enhanced Equipment Trust Certificates (EETC) [Member] - 2012-2C(R) EETC - Series C(R) [Member] - USD ($)	Dec. 31, 2018	May 15, 2018
Debt Instrument [Line Items]
Debt instrument, aggregate principal issued	$ 100,000,000	$ 100,000,000
Fixed interest rate	4.70%
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Debt instrument, aggregate principal issued	$ 100,000,000	$ 100,000,000
Fixed interest rate	4.70%

Debt - Equipment Loans and Othe

Debt - Equipment Loans and Other Notes Payable Issued in 2018 (Details) - Secured Debt [Member] - Equipment Loans and Other Notes Payable [Member] $ in Billions	12 Months Ended
	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Proceeds from notes payable	$ 1.5
LIBOR [Member]
Debt Instrument [Line Items]
Long-term debt average interest rate	4.28%
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Proceeds from notes payable	$ 1.5
American Airlines, Inc. [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Long-term debt average interest rate	4.28%

Debt - Senior Notes (Details)

Debt - Senior Notes (Details) - Unsecured Debt [Member]	12 Months Ended
	Dec. 31, 2018USD ($)
Senior Notes 5.50% Due in 2019 [Member]
Debt Instrument [Line Items]
Fixed interest rate	5.50%
Principal amount	$ 750,000,000
Senior Notes 4.625% Due in 2020 [Member]
Debt Instrument [Line Items]
Fixed interest rate	4.625%
Principal amount	$ 500,000,000
Senior Notes [Member]
Debt Instrument [Line Items]
Redemption price percentage	101.00%

Debt - Guarantees (Details)

Debt - Guarantees (Details)	Dec. 31, 2018USD ($)
Secured Debt [Member] | Special Facility Revenue Bonds [Member]
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 769,000,000
Secured Debt [Member] | Credit Facilities And Certain EETC Financings [Member]
Debt Instrument [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 8,400,000,000
Unsecured Debt [Member] | Senior Notes 5.50% Due in 2019 [Member]
Debt Instrument [Line Items]
Fixed interest rate	5.50%
Unsecured Debt [Member] | Senior Notes 4.625% Due in 2020 [Member]
Debt Instrument [Line Items]
Fixed interest rate	4.625%
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 - Collateral-Related Coven

Debt - Collateral-Related Covenants (Details) - Secured Debt [Member]	12 Months Ended
	Dec. 31, 2018
2013 Credit Facilities [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	34.80%
2014 Credit Facilities [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	18.80%
April 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	40.90%
December 2016 Credit Facilities [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	57.50%
American Airlines, Inc. [Member] | 2013 Credit Facilities [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	34.80%
American Airlines, Inc. [Member] | 2014 Credit Facilities [Member]
Debt Instrument [Line Items]
LTV Multiplier	1.6
Maximum LTV	62.50%
LTV as of Last Measurement Date	18.80%
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	40.90%
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	57.50%

Leases - Components of Lease Ex

Leases - Components of Lease Expense (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 1,907
Finance lease cost:
Amortization of assets	78
Interest on lease liabilities	48
Variable lease cost	2,353
Total net lease cost	4,386
American Airlines, Inc. [Member]
Lessee, Lease, Description [Line Items]
Operating lease cost	1,889
Finance lease cost:
Amortization of assets	78
Interest on lease liabilities	48
Variable lease cost	2,353
Total net lease cost	$ 4,368

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Operating leases:
Operating lease ROU assets	$ 9,151	$ 0
Current operating lease liabilities	1,654	0
Noncurrent operating lease liabilities	7,902	0
Total operating lease liabilities	9,556
Finance leases:
Property and equipment, at cost	936
Accumulated amortization	(391)
Property and equipment, net	545
Current obligations of finance leases	81
Finance leases, net of current obligations	613
Total finance lease liabilities	$ 694
Weighted average remaining lease term:
Operating leases	7 years 7 months 6 days
Finance leases	7 years 4 months 24 days
Weighted average discount rate:
Operating leases	4.60%
Finance leases	6.50%
American Airlines, Inc. [Member]
Operating leases:
Operating lease ROU assets	$ 9,094	0
Current operating lease liabilities	1,639	0
Noncurrent operating lease liabilities	7,857	$ 0
Total operating lease liabilities	9,496
Finance leases:
Property and equipment, at cost	936
Accumulated amortization	(391)
Property and equipment, net	545
Current obligations of finance leases	81
Finance leases, net of current obligations	613
Total finance lease liabilities	$ 694
Weighted average remaining lease term:
Operating leases	7 years 7 months 6 days
Finance leases	7 years 4 months 24 days
Weighted average discount rate:
Operating leases	4.60%
Finance leases	6.50%

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow and Other Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 1,931
Operating cash flows from finance leases	48
Financing cash flows from finance leases	78
ROU assets obtained in exchange for lease liabilities:
Operating leases	1,292
Gain on sale leaseback transactions, net	59
American Airlines, Inc. [Member]
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	1,914
Operating cash flows from finance leases	48
Financing cash flows from finance leases	78
ROU assets obtained in exchange for lease liabilities:
Operating leases	1,258
Gain on sale leaseback transactions, net	$ 59

Leases - Maturities of Lease Li

Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Operating Leases
2,019	$ 1,912
2,020	1,838
2,021	1,636
2,022	1,438
2,023	1,255
2024 and thereafter	3,620
Total lease payments	11,699
Less: Imputed interest	(2,143)
Total operating lease liabilities	9,556
Less: Current obligations	(1,654)	$ 0
Long-term lease obligations	7,902	0
Finance Leases
2,019	124
2,020	120
2,021	118
2,022	122
2,023	105
2024 and thereafter	282
Total lease payments	871
Less: Imputed interest	(177)
Total finance lease liabilities	694
Less: Current obligations	(81)
Long-term lease obligations	613
American Airlines, Inc. [Member]
Operating Leases
2,019	1,894
2,020	1,824
2,021	1,625
2,022	1,428
2,023	1,250
2024 and thereafter	3,611
Total lease payments	11,632
Less: Imputed interest	(2,136)
Total operating lease liabilities	9,496
Less: Current obligations	(1,639)	0
Long-term lease obligations	7,857	$ 0
Finance Leases
2,019	124
2,020	120
2,021	118
2,022	122
2,023	105
2024 and thereafter	282
Total lease payments	871
Less: Imputed interest	(177)
Total finance lease liabilities	694
Less: Current obligations	(81)
Long-term lease obligations	$ 613

Leases - Future Minimum Lease P

Leases - Future Minimum Lease Payments (Details) $ in Millions	Dec. 31, 2017USD ($)
Operating Leases
2,018	$ 2,572
2,019	2,329
2,020	2,104
2,021	1,621
2,022	1,398
2023 and thereafter	3,965
Total lease payments	13,989
Capital Leases
2,018	126
2,019	123
2,020	120
2,021	118
2,022	122
2023 and thereafter	387
Total lease payments	996
Less: Imputed interest	(225)
Total lease obligations	771
Less: Current obligations	(78)
Long-term lease obligations	693
American Airlines, Inc. [Member]
Operating Leases
2,018	2,555
2,019	2,321
2,020	2,096
2,021	1,613
2,022	1,394
2023 and thereafter	3,952
Total lease payments	13,931
Capital Leases
2,018	126
2,019	123
2,020	120
2,021	118
2,022	122
2023 and thereafter	387
Total lease payments	996
Less: Imputed interest	(225)
Total lease obligations	771
Less: Current obligations	(78)
Long-term lease obligations	$ 693

Leases - Additional Information

Leases - Additional Information (Details) $ in Millions	Dec. 31, 2018USD ($)Aircraft	Dec. 31, 2018USD ($)Aircraft	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Lessee, Lease, Description [Line Items]
Number of leased aircraft | Aircraft	660	660
Operating lease cost		$ 1,907
Operating lease commitments that have not yet commenced	$ 1,900	$ 1,900
Operating lease commitments that have not yet commenced, number of aircraft | Aircraft	22	22
Operating lease commitments that have not yet commenced, lease term	10 years	10 years
Operating lease rent expense			$ 3,200	$ 3,200
Republic Holdings [Member]
Lessee, Lease, Description [Line Items]
Ownership interest	25.00%	25.00%
Republic [Member]
Lessee, Lease, Description [Line Items]
Operating lease cost		$ 226
American Airlines, Inc. [Member]
Lessee, Lease, Description [Line Items]
Number of leased aircraft | Aircraft	660	660
Operating lease cost		$ 1,889
Operating lease commitments that have not yet commenced	$ 1,900	$ 1,900
Operating lease commitments that have not yet commenced, number of aircraft | Aircraft	22	22
Operating lease commitments that have not yet commenced, lease term	10 years	10 years
Operating lease rent expense			$ 3,200	$ 3,100
American Airlines, Inc. [Member] | Republic Holdings [Member]
Lessee, Lease, Description [Line Items]
Ownership interest	25.00%	25.00%
American Airlines, Inc. [Member] | Republic [Member]
Lessee, Lease, Description [Line Items]
Operating lease cost		$ 226
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lease terms	1 year
Minimum [Member] | American Airlines, Inc. [Member]
Lessee, Lease, Description [Line Items]
Lease terms	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lease terms	12 years
Maximum [Member] | American Airlines, Inc. [Member]
Lessee, Lease, Description [Line Items]
Lease terms	12 years

Income Taxes - Components of In

Income Taxes - Components of Income Tax Provision (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current income tax provision:
State and Local	$ 3	$ 10	$ 3
Foreign	29	14	9
Current income tax provision	32	24	12
Deferred income tax provision:
Federal	390	2,026	1,456
State and Local	50	63	100
Deferred income tax provision	440	2,089	1,556
Total income tax provision	472	2,113	1,568
American Airlines, Inc. [Member]
Current income tax provision:
State and Local	3	14	1
Foreign	28	10	9
Current income tax provision	31	24	10
Deferred income tax provision:
Federal	453	2,176	1,507
State and Local	50	70	90
Deferred income tax provision	503	2,246	1,597
Total income tax provision	$ 534	$ 2,270	$ 1,607

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Income Tax Provision (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Line Items]
Statutory income tax provision		$ 396	$ 1,188	$ 1,453
State income tax provision, net of federal tax effect		44	59	56
Foreign income taxes, net of federal tax effect		23	7	6
Book expenses not deductible for tax purposes		12	33	35
Bankruptcy administration expenses		0	1	1
2017 Tax Act		0	823	0
Change in valuation allowance		(6)	(3)	7
Other, net		3	5	10
Total income tax provision		472	2,113	1,568
American Airlines, Inc. [Member]
Income Tax Disclosure [Line Items]
Statutory income tax provision		460	1,244	1,504
State income tax provision, net of federal tax effect		46	53	61
Foreign income taxes, net of federal tax effect		22	6	6
Book expenses not deductible for tax purposes		10	30	32
Bankruptcy administration expenses		0	1	1
2017 Tax Act		0	924	0
Change in valuation allowance	$ (22)	(6)	4	(1)
Other, net		2	8	4
Total income tax provision		$ 534	$ 2,270	$ 1,607

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Operating loss carryforwards	$ 2,343	$ 2,281
Leases	2,189	107
Pensions	1,430	1,559
Loyalty program liability	1,770	1,809
Alternative minimum tax (AMT) credit carryforwards	175	344
Postretirement benefits other than pensions	145	170
Rent expense	136	160
Reorganization items	33	35
Other	631	678
Total deferred tax assets	8,852	7,143
Valuation allowance	(30)	(36)
Net deferred tax assets	8,822	7,107
Deferred tax liabilities:
Accelerated depreciation and amortization	(5,280)	(5,045)
Leases	(2,081)	0
Other	(326)	(279)
Total deferred tax liabilities	(7,687)	(5,324)
Net deferred tax asset	1,135	1,783
American Airlines, Inc. [Member]
Deferred tax assets:
Operating loss carryforwards	2,420	2,409
Leases	2,176	107
Pensions	1,421	1,549
Loyalty program liability	1,770	1,809
Alternative minimum tax (AMT) credit carryforwards	231	457
Postretirement benefits other than pensions	145	170
Rent expense	136	160
Reorganization items	33	35
Other	588	638
Total deferred tax assets	8,920	7,334
Valuation allowance	(19)	(25)
Net deferred tax assets	8,901	7,309
Deferred tax liabilities:
Accelerated depreciation and amortization	(5,243)	(4,999)
Leases	(2,068)	0
Other	(321)	(274)
Total deferred tax liabilities	(7,632)	(5,273)
Net deferred tax asset	$ 1,269	$ 2,036

Income Taxes - Additional Discl

Income Taxes - Additional Disclosures (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Increase (decrease) in valuation allowance			$ (6)	$ 7	$ 7
Valuation allowance, Tax Cuts And Jobs Act Of 2017, deferred tax asset, increase				10
Income tax provision			$ 472	2,113	1,568
Income tax expense, effective rate			25.00%
Change in valuation allowance			$ (6)	(3)	7
Special income tax charge			18	823	0
Impact of Tax Act, charge to reduce deferred tax assets		$ 823	0	823	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	10,200		10,200
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	3,200		3,200
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Special income tax charge			18
Alternative Minimum Tax Credit Carryforward [Member]
Income Taxes [Line Items]
Change in valuation allowance	(22)
American Airlines, Inc. [Member]
Income Taxes [Line Items]
Increase (decrease) in valuation allowance			(6)	12	(1)
Valuation allowance, Tax Cuts And Jobs Act Of 2017, deferred tax asset, increase				8
Income tax provision			$ 534	2,270	1,607
Income tax expense, effective rate			24.00%
Change in valuation allowance	(22)		$ (6)	4	(1)
Special income tax charge			18	924	0
Impact of Tax Act, charge to reduce deferred tax assets		$ 924	0	$ 924	$ 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	$ 3,100		3,100
American Airlines, Inc. [Member] | Foreign Tax Authority [Member]
Income Taxes [Line Items]
Special income tax charge			$ 18

Risk Management - Additional In

Risk Management - Additional Information (Details) $ in Billions	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Principal amount of long-term variable rate debt	$ 9.9
Variable Rate Debt [Member]
Debt Instrument [Line Items]
Weighted average effective interest rate on variable rate debt	4.30%
American Airlines, Inc. [Member]
Debt Instrument [Line Items]
Principal amount of long-term variable rate debt	$ 9.9
American Airlines, Inc. [Member] | Variable Rate Debt [Member]
Debt Instrument [Line Items]
Weighted average effective interest rate on variable rate debt	4.30%

Fair Value Measurements and O_3

Fair Value Measurements and Other Investments - Summary of Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	$ 4,485	$ 4,771
China Southern Airlines [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Ownership interest	2.20%
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	$ 4,485	4,771
Restricted cash and short-term investments	154	318
Long-term investments	189
Total	4,828	5,089
Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	16	188
Restricted cash and short-term investments	12	108
Long-term investments	189
Total	217	296
Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	4,469	4,583
Restricted cash and short-term investments	142	210
Long-term investments	0
Total	4,611	4,793
Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Restricted cash and short-term investments	0	0
Long-term investments	0
Total	0	0
Recurring [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	16	188
Recurring [Member] | Money Market Funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	16	188
Recurring [Member] | Money Market Funds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Recurring [Member] | Money Market Funds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Recurring [Member] | Corporate debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	1,658	1,620
Recurring [Member] | Corporate debt [Member] | Maturity Dates Exceeding One Year [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	101	341
Recurring [Member] | Corporate debt [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Recurring [Member] | Corporate debt [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	1,658	1,620
Recurring [Member] | Corporate debt [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Recurring [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	2,436	2,663
Recurring [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	877	700
Recurring [Member] | Bank Notes / Certificates of Deposit / Time Deposits [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Recurring [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	2,436	2,663
Recurring [Member] | Bank Notes / Certificates of Deposit / Time Deposits [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Recurring [Member] | Repurchase Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	375	300
Recurring [Member] | Repurchase Agreements [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Recurring [Member] | Repurchase Agreements [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	375	300
Recurring [Member] | Repurchase Agreements [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
American Airlines, Inc. [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	$ 4,482	4,768
American Airlines, Inc. [Member] | China Southern Airlines [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Ownership interest	2.20%
American Airlines, Inc. [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	$ 4,482	4,768
Restricted cash and short-term investments	154	318
Long-term investments	189
Total	4,825	5,086
American Airlines, Inc. [Member] | Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	14	186
Restricted cash and short-term investments	12	108
Long-term investments	189
Total	215	294
American Airlines, Inc. [Member] | Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	4,468	4,582
Restricted cash and short-term investments	142	210
Long-term investments	0
Total	4,610	4,792
American Airlines, Inc. [Member] | Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Restricted cash and short-term investments	0	0
Long-term investments	0
Total	0	0
American Airlines, Inc. [Member] | Recurring [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	14	186
American Airlines, Inc. [Member] | Recurring [Member] | Money Market Funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	14	186
American Airlines, Inc. [Member] | Recurring [Member] | Money Market Funds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
American Airlines, Inc. [Member] | Recurring [Member] | Money Market Funds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
American Airlines, Inc. [Member] | Recurring [Member] | Corporate debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	1,658	1,620
American Airlines, Inc. [Member] | Recurring [Member] | Corporate debt [Member] | Maturity Dates Exceeding One Year [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	101	341
American Airlines, Inc. [Member] | Recurring [Member] | Corporate debt [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
American Airlines, Inc. [Member] | Recurring [Member] | Corporate debt [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	1,658	1,620
American Airlines, Inc. [Member] | Recurring [Member] | Corporate debt [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
American Airlines, Inc. [Member] | Recurring [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	2,435	2,662
American Airlines, Inc. [Member] | Recurring [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	877	700
American Airlines, Inc. [Member] | Recurring [Member] | Bank Notes / Certificates of Deposit / Time Deposits [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
American Airlines, Inc. [Member] | Recurring [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	2,435	2,662
American Airlines, Inc. [Member] | Recurring [Member] | Bank Notes / Certificates of Deposit / Time Deposits [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
American Airlines, Inc. [Member] | Recurring [Member] | Repurchase Agreements [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	375	300
American Airlines, Inc. [Member] | Recurring [Member] | Repurchase Agreements [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
American Airlines, Inc. [Member] | Recurring [Member] | Repurchase Agreements [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	375	300
American Airlines, Inc. [Member] | Recurring [Member] | Repurchase Agreements [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	$ 0	$ 0

Fair Value Measurements and O_4

Fair Value Measurements and Other Investments - Schedule of Carrying Value and Estimated Fair Value of Long-Term Debt, Including Current Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, including current maturities	$ 23,779	$ 24,294
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	23,775	24,985
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	22,503	22,523
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	$ 22,497	$ 23,165

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) for plan amendment				$ (1,900,000,000)
Amortization period of gains losses related to plan amendment				8 years
Unamortized actuarial gain	$ 390,000,000
Weighted average expected rate of return on plan assets	8.00%
Estimated future employer contributions for next fiscal year	$ 786,000,000
Defined benefit plans estimated supplemental future employer contributions in next fiscal year	21,000,000
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
The estimated actuarial gain (loss) and prior service benefit (cost) that will be amortized into net periodic benefit cost over the next fiscal year	$ (181,000,000)
Weighted average expected rate of return on plan assets	8.00%	8.00%	8.00%
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
The estimated actuarial gain (loss) and prior service benefit (cost) that will be amortized into net periodic benefit cost over the next fiscal year	$ 269,000,000
Weighted average expected rate of return on plan assets	8.00%	8.00%	8.00%
American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) for plan amendment				$ (1,900,000,000)
Amortization period of gains losses related to plan amendment				8 years
Unamortized actuarial gain	$ 390,000,000
Estimated future employer contributions for next fiscal year	780,000,000
Defined benefit plans estimated supplemental future employer contributions in next fiscal year	21,000,000
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
The estimated actuarial gain (loss) and prior service benefit (cost) that will be amortized into net periodic benefit cost over the next fiscal year	$ (181,000,000)
Weighted average expected rate of 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]
The estimated actuarial gain (loss) and prior service benefit (cost) that will be amortized into net periodic benefit cost over the next fiscal year	$ 269,000,000
Weighted average expected rate of return on plan assets	8.00%	8.00%	8.00%

Employee Benefit Plans - Schedu

Employee Benefit Plans - Schedule of Changes in Projected Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits [Member]
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	$ 18,275	$ 17,238
Service cost	3	2	$ 2
Interest cost	674	721	749
Actuarial (gain) loss	(1,910)	1,016
Settlements	(4)	(4)
Benefit payments	(662)	(726)
Other	2	28
Benefit obligation at end of period	16,378	18,275	17,238
Retiree Medical And Other Postretirement Benefits [Member]
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	1,011	991
Service cost	5	4	3
Interest cost	35	39	47
Actuarial (gain) loss	(133)	49
Settlements	0	0
Benefit payments	(81)	(80)
Other	0	8
Benefit obligation at end of period	837	1,011	991
American Airlines, Inc. [Member] | Pension Benefits [Member]
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	18,175	17,148
Service cost	2	2	2
Interest cost	670	717	746
Actuarial (gain) loss	(1,905)	1,007
Settlements	(4)	(4)
Benefit payments	(659)	(723)
Other	3	28
Benefit obligation at end of period	16,282	18,175	17,148
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Reconciliation of benefit obligation:
Benefit obligation at beginning of period	1,010	990
Service cost	5	4	3
Interest cost	35	39	47
Actuarial (gain) loss	(132)	49
Settlements	0	0
Benefit payments	(81)	(80)
Other	0	8
Benefit obligation at end of period	$ 837	$ 1,010	$ 990

Employee Benefit Plans - Sche_2

Employee Benefit Plans - Schedule of Changes in Fair Value of Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Pension Benefits [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of period	$ 11,395	$ 10,017
Actual return on plan assets	(1,151)	1,797
Employer contributions	475	286
Settlements	(4)	(4)
Benefit payments	(662)	(726)
Other	0	25
Fair value of plan assets at end of period	10,053	11,395
Funded status at end of period	(6,325)	(6,880)
Supplemental contributions by employer	433	261
Minimum required cash contribution	42	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	295	266
Actual return on plan assets	(24)	37
Employer contributions	35	72
Settlements	0	0
Benefit payments	(81)	(80)
Other	0	0
Fair value of plan assets at end of period	225	295
Funded status at end of period	(612)	(716)
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	11,340	9,968
Actual return on plan assets	(1,148)	1,788
Employer contributions	472	286
Settlements	(4)	(4)
Benefit payments	(659)	(723)
Other	0	25
Fair value of plan assets at end of period	10,001	11,340
Funded status at end of period	(6,281)	(6,835)
Supplemental contributions by employer	433	261
Minimum required cash contribution	39	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	295	266
Actual return on plan assets	(24)	37
Employer contributions	35	72
Settlements	0	0
Benefit payments	(81)	(80)
Other	0	0
Fair value of plan assets at end of period	225	295
Funded status at end of period	$ (612)	$ (715)

Employee Benefit Plans - Sche_3

Employee Benefit Plans - Schedule of Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liability	$ 6,907	$ 7,497
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liability	7	10
Noncurrent liability	6,318	6,870
Total liabilities	6,325	6,880
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liability	23	89
Noncurrent liability	589	627
Total liabilities	612	716
American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liability	6,863	7,452
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liability	7	10
Noncurrent liability	6,274	6,825
Total liabilities	6,281	6,835
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liability	23	88
Noncurrent liability	589	627
Total liabilities	$ 612	$ 715

Employee Benefit Plans - Sche_4

Employee Benefit Plans - Schedule of Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	$ 5,356	$ 5,351
Prior service cost (benefit)	131	160
Total accumulated other comprehensive loss (income), pre-tax	5,487	5,511
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(452)	(388)
Prior service cost (benefit)	(362)	(600)
Total accumulated other comprehensive loss (income), pre-tax	(814)	(988)
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	5,341	5,337
Prior service cost (benefit)	131	159
Total accumulated other comprehensive loss (income), pre-tax	5,472	5,496
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss (gain)	(452)	(388)
Prior service cost (benefit)	(362)	(600)
Total accumulated other comprehensive loss (income), pre-tax	$ (814)	$ (988)

Employee Benefit Plans - Sche_5

Employee Benefit Plans - Schedule of Accumulated Benefit Obligations Exceeding Fair Value of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 16,351	$ 18,245
Accumulated benefit obligation	16,341	18,235
Fair value of plan assets	10,023	11,364
ABO less fair value of plan assets	6,318	6,871
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	837	1,011
Fair value of plan assets	225	295
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	16,254	18,144
Accumulated benefit obligation	16,246	18,135
Fair value of plan assets	9,971	11,307
ABO less fair value of plan assets	6,275	6,828
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	837	1,010
Fair value of plan assets	$ 225	$ 295

Employee Benefit Plans - Compon

Employee Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits [Member]
Defined benefit plans:
Service cost	$ 3	$ 2	$ 2
Interest cost	674	721	749
Expected return on assets	(905)	(790)	(750)
Settlements	0	1	0
Amortization of:
Prior service cost (benefit)	28	28	28
Unrecognized net loss (gain)	141	144	126
Net periodic benefit cost (income)	(59)	106	155
Retiree Medical And Other Postretirement Benefits [Member]
Defined benefit plans:
Service cost	5	4	3
Interest cost	35	39	47
Expected return on assets	(24)	(21)	(20)
Settlements	0	0	0
Amortization of:
Prior service cost (benefit)	(236)	(237)	(240)
Unrecognized net loss (gain)	(21)	(23)	(17)
Net periodic benefit cost (income)	(241)	(238)	(227)
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined benefit plans:
Service cost	2	2	2
Interest cost	670	717	746
Expected return on assets	(901)	(786)	(747)
Settlements	0	1	0
Amortization of:
Prior service cost (benefit)	28	28	28
Unrecognized net loss (gain)	140	144	125
Net periodic benefit cost (income)	(61)	106	154
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined benefit plans:
Service cost	5	4	3
Interest cost	35	39	47
Expected return on assets	(24)	(21)	(20)
Settlements			0
Amortization of:
Prior service cost (benefit)	(236)	(237)	(240)
Unrecognized net loss (gain)	(21)	(23)	(16)
Net periodic benefit cost (income)	$ (241)	$ (238)	$ (226)

Employee Benefit Plans - Sche_6

Employee Benefit Plans - Schedule of Assumption Used to Determine Benefit Obligations (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net periodic benefit cost:
Weighted average expected rate of return on plan assets	8.00%
Pension Benefits [Member]
Benefit obligations:
Weighted average discount rate	4.40%	3.80%
Net periodic benefit cost:
Weighted average discount rate	3.80%	4.30%	4.70%
Weighted average expected rate of return on plan assets	8.00%	8.00%	8.00%
Retiree Medical And Other Postretirement Benefits [Member]
Benefit obligations:
Weighted average discount rate	4.30%	3.60%
Net periodic benefit cost:
Weighted average discount rate	3.60%	4.10%	4.42%
Weighted average expected rate of return on plan assets	8.00%	8.00%	8.00%
Weighted average health care cost trend rate assumed for next year	3.91%	4.19%	4.25%
Weighted average health care cost trend rate assumed for 2025 and thereafter	3.45%
American Airlines, Inc. [Member] | Pension Benefits [Member]
Benefit obligations:
Weighted average discount rate	4.40%	3.80%
Net periodic benefit cost:
Weighted average discount rate	3.80%	4.30%	4.70%
Weighted average expected rate of return on plan assets	8.00%	8.00%	8.00%
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Benefit obligations:
Weighted average discount rate	4.30%	3.60%
Net periodic benefit cost:
Weighted average discount rate	3.60%	4.10%	4.42%
Weighted average expected rate of return on plan assets	8.00%	8.00%	8.00%
Weighted average health care cost trend rate assumed for next year	3.91%	4.19%	4.25%
Weighted average health care cost trend rate assumed for 2025 and thereafter	3.45%

Employee Benefit Plans - Sche_7

Employee Benefit Plans - Schedule of One Percentage Point Change in Assumed Health Care Cost Trend Rates (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) on service and interest cost, 1% Increase	$ 2
Increase (decrease) on benefit obligation, 1% Increase	47
Increase (decrease) on service and interest cost, 1% Decrease	(2)
Increase (decrease) on benefits obligation, 1% Decrease	(43)
American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Increase (decrease) on service and interest cost, 1% Increase	2
Increase (decrease) on benefit obligation, 1% Increase	47
Increase (decrease) on service and interest cost, 1% Decrease	(2)
Increase (decrease) on benefits obligation, 1% Decrease	$ (43)

Employee Benefit Plans - Sche_8

Employee Benefit Plans - Schedule of Expected Future Service Benefit Payments (Details) $ in Millions	Dec. 31, 2018USD ($)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2,019	$ 720
2,020	758
2,021	797
2,022	836
2,023	876
2024-2028	4,917
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2,019	84
2,020	75
2,021	71
2,022	66
2,023	64
2024-2028	280
American Airlines, Inc. [Member] | Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2,019	717
2,020	754
2,021	793
2,022	831
2,023	872
2024-2028	4,891
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
2,019	84
2,020	75
2,021	71
2,022	66
2,023	64
2024-2028	$ 280

Employee Benefit Plans - Sche_9

Employee Benefit Plans - Schedule of Allocation of Plan Assets (Details)	Dec. 31, 2018
Equity [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	60.00%
Equity [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	85.00%
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 Income [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
Private Income [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	10.00%
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	60.00%
American Airlines, Inc. [Member] | Equity [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	85.00%
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 Income [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	0.00%
American Airlines, Inc. [Member] | Private Income [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Strategic target asset allocation	10.00%
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 - Sch_10

Employee Benefit Plans - Schedule of Fair Value of Pension Plan Assets by Asset Category (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 10,053	$ 11,395	$ 10,017
Pension Benefits [Member] | Private market partnerships [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	14	21
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	10,053	11,395
Pension Benefits [Member] | Recurring [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6,027	7,281
Pension Benefits [Member] | Recurring [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,602	2,936
Pension Benefits [Member] | Recurring [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9	16
Pension Benefits [Member] | Recurring [Member] | Cash and cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	23	28
Pension Benefits [Member] | Recurring [Member] | Cash and cash equivalents [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	23	28
Pension Benefits [Member] | Recurring [Member] | Cash and cash equivalents [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Cash and cash equivalents [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | International markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,181	3,837
Pension Benefits [Member] | Recurring [Member] | International markets [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,181	3,837
Pension Benefits [Member] | Recurring [Member] | International markets [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | International markets [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Large-cap companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,021	2,451
Pension Benefits [Member] | Recurring [Member] | Large-cap companies [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,021	2,451
Pension Benefits [Member] | Recurring [Member] | Large-cap companies [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Large-cap companies [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Mid-cap companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	583	744
Pension Benefits [Member] | Recurring [Member] | Mid-cap companies [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	583	744
Pension Benefits [Member] | Recurring [Member] | Mid-cap companies [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Mid-cap companies [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Small-cap companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	122	125
Pension Benefits [Member] | Recurring [Member] | Small-cap companies [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	122	125
Pension Benefits [Member] | Recurring [Member] | Small-cap companies [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Small-cap companies [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	52	55
Pension Benefits [Member] | Recurring [Member] | Mutual Funds [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	52	55
Pension Benefits [Member] | Recurring [Member] | Mutual Funds [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Mutual Funds [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Corporate debt [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,116	2,344
Pension Benefits [Member] | Recurring [Member] | Corporate debt [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Corporate debt [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,116	2,344
Pension Benefits [Member] | Recurring [Member] | Corporate debt [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	228	238
Pension Benefits [Member] | Recurring [Member] | Government Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Government Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	228	238
Pension Benefits [Member] | Recurring [Member] | Government Securities [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | U.S. municipal securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	40	39
Pension Benefits [Member] | Recurring [Member] | U.S. municipal securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | U.S. municipal securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	40	39
Pension Benefits [Member] | Recurring [Member] | U.S. municipal securities [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	14
Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	14
Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,188	879
Pension Benefits [Member] | Recurring [Member] | Common/collective trusts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	218	315
Pension Benefits [Member] | Recurring [Member] | Common/collective trusts [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Common/collective trusts [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	218	315
Pension Benefits [Member] | Recurring [Member] | Common/collective trusts [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Common/collective trusts and 103-12 Investment Trust measured at net asset value [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	227	283
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 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Insurance Group Annuity Contracts [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
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	47	44
Pension Benefits [Member] | Recurring [Member] | Dividend and interest receivable [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	47	44
Pension Benefits [Member] | Recurring [Member] | Dividend and interest receivable [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Dividend and interest receivable [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
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	5	3
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	5	3
Pension Benefits [Member] | Recurring [Member] | Due to/from brokers for sale of securities - net [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Due to/from brokers for sale of securities - net [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Other liabilities - net [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(7)	(6)
Pension Benefits [Member] | Recurring [Member] | Other liabilities - net [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(7)	(6)
Pension Benefits [Member] | Recurring [Member] | Other liabilities - net [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension Benefits [Member] | Recurring [Member] | Other liabilities - net [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Private market partnerships [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	14	21
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	10,001	11,340	$ 9,968
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,001	11,340
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,975	7,226
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,602	2,936
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9	16
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	23	28
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	23	28
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Cash and cash equivalents [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Cash and cash equivalents [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | International markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,181	3,837
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	3,181	3,837
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | International markets [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | International markets [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Large-cap companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,021	2,451
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	2,021	2,451
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Large-cap companies [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Large-cap companies [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Mid-cap companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	583	744
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	583	744
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Mid-cap companies [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Mid-cap companies [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Small-cap companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	122	125
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	122	125
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Small-cap companies [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Small-cap companies [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Corporate debt [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,116	2,344
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Corporate debt [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Corporate debt [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,116	2,344
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Corporate debt [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	228	238
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Government Securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
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	228	238
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Government Securities [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
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	40	39
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | U.S. municipal securities [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
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	40	39
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | U.S. municipal securities [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	14
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	14
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Private market partnerships [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,188	879
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Common/collective trusts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	218	315
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Common/collective trusts [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
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	218	315
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Common/collective trusts [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Common/collective trusts and 103-12 Investment Trust measured at net asset value [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	227	283
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 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Insurance Group Annuity Contracts [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
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	47	44
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	47	44
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Dividend and interest receivable [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Dividend and interest receivable [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
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	5	3
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	5	3
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Due to/from brokers for sale of securities - net [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Due to/from brokers for sale of securities - net [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Other liabilities - net [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(7)	(6)
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	(7)	(6)
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Other liabilities - net [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
American Airlines, Inc. [Member] | Pension Benefits [Member] | Recurring [Member] | Other liabilities - net [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0

Employee Benefit Plans - Sch_11

Employee Benefit Plans - Schedule of Fair Value of Pension Plan Assets by Asset Category - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
International markets, United Kingdom [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	17.00%	17.00%
International markets, United Kingdom [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	17.00%	17.00%
International markets, Japan [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	10.00%	11.00%
International markets, Japan [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	10.00%	11.00%
International markets, France [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	8.00%	9.00%
International markets, France [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	8.00%	9.00%
International markets, Switzerland [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	7.00%	6.00%
International markets, Switzerland [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	7.00%	6.00%
International markets, Ireland [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	6.00%
International markets, Ireland [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	6.00%
International markets, emerging markets [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	17.00%	16.00%
International markets, emerging markets [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	17.00%	16.00%
International markets, no concentration greater than 5% in any one country[Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	35.00%	41.00%
International markets, no concentration greater than 5% in any one country[Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	35.00%	41.00%
Mutual funds [Member] | U.S. Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	37.00%	39.00%
Mutual funds [Member] | US Treasuries and Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	38.00%	34.00%
Mutual funds [Member] | International Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	25.00%	27.00%
Mutual funds [Member] | International Companies [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	30.00%	30.00%
Corporate debt [Member] | U.S. Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	85.00%	85.00%
Corporate debt [Member] | U.S. Companies [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	85.00%	85.00%
Corporate debt [Member] | International Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	12.00%	12.00%
Corporate debt [Member] | International Companies [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	12.00%	12.00%
Corporate debt [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	77.00%	76.00%
Corporate debt [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	77.00%	76.00%
Corporate debt [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	23.00%	24.00%
Corporate debt [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	23.00%	24.00%
Corporate debt [Member] | Emerging Market Companies [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	3.00%	3.00%
Corporate debt [Member] | Emerging Market Companies [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	3.00%	3.00%
Government securities [Member] | Domestic Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	32.00%	27.00%
Government securities [Member] | Domestic Government Securities [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	32.00%	27.00%
Government securities [Member] | Emerging Market Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	37.00%	43.00%
Government securities [Member] | Emerging Market Government Securities [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	37.00%	43.00%
Government securities [Member] | Other International Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	31.00%	30.00%
Government securities [Member] | Other International Government Securities [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	31.00%	30.00%
Government securities [Member] | U.S. Buyout Opportunities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations		94.00%
Government securities [Member] | European Buyout Opportunities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations		6.00%
Private market partnerships [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan master trust future funding commitments	$ 1,000	$ 903
Private market partnerships [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan master trust future funding commitments	$ 1,000	$ 903
Private market partnerships [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated period of liquidation of underlying assets	1 year	1 year
Private market partnerships [Member] | Minimum [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated period of liquidation of underlying assets	1 year	1 year
Private market partnerships [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated period of liquidation of underlying assets	10 years	10 years
Private market partnerships [Member] | Maximum [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated period of liquidation of underlying assets	10 years	10 years
Private market partnerships [Member] | U.S. Buyout Opportunities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	94.00%
Private market partnerships [Member] | U.S. Buyout Opportunities [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	94.00%	94.00%
Private market partnerships [Member] | European Buyout Opportunities [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	6.00%
Private market partnerships [Member] | European Buyout Opportunities [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	6.00%	6.00%
Common/collective trusts and 103-12 Investment Trust measured at net asset value [Member] | Emerging Market 103-12 Investment Trust [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	45.00%	40.00%
Common/collective trusts and 103-12 Investment Trust measured at net asset value [Member] | Emerging Market 103-12 Investment Trust [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	45.00%	40.00%
Common/collective trusts and 103-12 Investment Trust measured at net asset value [Member] | Collective Interest Trust [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	37.00%	42.00%
Common/collective trusts and 103-12 Investment Trust measured at net asset value [Member] | Collective Interest Trust [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	37.00%	42.00%
Common/collective trusts and 103-12 Investment Trust measured at net asset value [Member] | Canadian Segregated Balanced Value [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	12.00%	10.00%
Common/collective trusts and 103-12 Investment Trust measured at net asset value [Member] | Canadian Segregated Balanced Value [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	12.00%	10.00%
Common/collective trusts and 103-12 Investment Trust measured at net asset value [Member] | Common/Collective Trust [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	6.00%	8.00%
Common/collective trusts and 103-12 Investment Trust measured at net asset value [Member] | Common/Collective Trust [Member] | American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	6.00%	8.00%

Employee Benefit Plans - Change

Employee Benefit Plans - Changes in Fair Value Measurements of Level 3 Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Pension Benefits [Member]
Change in fair value measurements of level 3 investments
Fair value of plan assets at beginning of period	$ 11,395	$ 10,017
Actual loss on plan assets:
Fair value of plan assets at end of period	10,053	11,395
Pension Benefits [Member] | Level 3 [Member] | Private market partnerships [Member]
Change in fair value measurements of level 3 investments
Fair value of plan assets at beginning of period	14	21
Actual loss on plan assets:
Relating to assets still held at the reporting date	(2)	(4)
Purchases	1	1
Sales	(6)	(1)
Transfers out		(3)
Fair value of plan assets at end of period	7	14
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
Actual loss on plan assets:
Relating to assets still held at the reporting date	0	0
Purchases	0	0
Sales	0	0
Transfers out		0
Fair value of plan assets at end of period	2	2
American Airlines, Inc. [Member] | Level 3 [Member] | Private market partnerships [Member]
Change in fair value measurements of level 3 investments
Fair value of plan assets at beginning of period	14	21
Actual loss on plan assets:
Relating to assets still held at the reporting date	(2)	(4)
Purchases	1	1
Sales	(6)	(1)
Transfers out		(3)
Fair value of plan assets at end of period	7	14
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
Actual loss on plan assets:
Relating to assets still held at the reporting date	0	0
Purchases	0	0
Sales	0	0
Transfers out		0
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	11,340	9,968
Actual loss on plan assets:
Fair value of plan assets at end of period	$ 10,001	$ 11,340

Employee Benefit Plans - Fair V

Employee Benefit Plans - Fair Values of Retiree Medical and Other Postretirement Benefit Plans Assets by Asset Category (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Mutual funds [Member] | non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	25.00%	27.00%
Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 225	$ 295	$ 266
Retiree Medical And Other Postretirement Benefits [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	5
Retiree Medical And Other Postretirement Benefits [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	221	290
Retiree Medical And Other Postretirement Benefits [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retiree Medical And Other Postretirement Benefits [Member] | Money market funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	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	4	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	0
Retiree Medical And Other Postretirement Benefits [Member] | Money market funds [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Retiree Medical And Other Postretirement Benefits [Member] | Mutual funds - AAL Class [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	221	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	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	221	290
Retiree Medical And Other Postretirement Benefits [Member] | Mutual funds - AAL Class [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0
Retiree Medical And Other Postretirement Benefits [Member] | Mutual funds [Member] | non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	30.00%	30.00%
American Airlines, Inc. [Member] | Mutual funds [Member] | non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Actual plan asset allocations	30.00%	30.00%
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 225	$ 295	$ 266
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	4	5
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	221	290
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member] | Level 3 [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] | Money market funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	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	4	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] | Money market funds [Member] | Level 3 [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	221	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	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	221	290
American Airlines, Inc. [Member] | Retiree Medical And Other Postretirement Benefits [Member] | Mutual funds - AAL Class [Member] | Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0

Employee Benefit Plans - Define

Employee Benefit Plans - Defined Contribution Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items]
Contributions to defined contribution benefit plans	$ 877	$ 851	$ 766
American Airlines, Inc. [Member]
Defined Contribution Plan Disclosure [Line Items]
Contributions to defined contribution benefit plans	$ 856	$ 844	$ 761

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, 2018USD ($)
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	$ 175
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	$ 175

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (AOCI) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
AOCI tax, attributable to parent [Roll Forward]
Beginning balance, tax	$ (630)	$ (677)
Other comprehensive income (loss) before reclassifications, tax	15	15
Amounts reclassified from AOCI, tax	19	32
Net current-period other comprehensive income (loss), tax	34	47
Ending balance, tax	(596)	(630)	$ (677)
AOCI attributable to parent, net of tax [Roll Forward]
Beginning balance, net of tax	(5,154)	(5,083)
Other comprehensive income (loss) before reclassifications, net of tax	(51)	(16)
Amounts reclassified from AOCI, net of tax	(69)	(55)
Total other comprehensive loss, net of tax	(120)	(71)	(351)
Ending balance, net of tax	(5,274)	(5,154)	(5,083)
Pension, Retiree Medical and Other Postretirement Benefits [Member]
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	(4,523)	(4,406)
Other comprehensive income (loss) before reclassifications, before tax	(62)	(30)
Amounts reclassified from AOCI, before tax	(88)	(87)
Net current-period other comprehensive income (loss), before tax	(150)	(117)
Ending balance, before tax	(4,673)	(4,523)	(4,406)
Unrealized Gain/(Loss) on Investments [Member]
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	(1)	0
Other comprehensive income (loss) before reclassifications, before tax	(4)	(1)
Amounts reclassified from AOCI, before tax	0	0
Net current-period other comprehensive income (loss), before tax	(4)	(1)
Ending balance, before tax	(5)	(1)	0
American Airlines, Inc. [Member]
AOCI tax, attributable to parent [Roll Forward]
Beginning balance, tax	(742)	(788)
Other comprehensive income (loss) before reclassifications, tax	15	14
Amounts reclassified from AOCI, tax	20	32
Net current-period other comprehensive income (loss), tax	35	46
Ending balance, tax	(707)	(742)	(788)
AOCI attributable to parent, net of tax [Roll Forward]
Beginning balance, net of tax	(5,251)	(5,182)
Other comprehensive income (loss) before reclassifications, net of tax	(50)	(14)
Amounts reclassified from AOCI, net of tax	(69)	(55)
Total other comprehensive loss, net of tax	(119)	(69)	(351)
Ending balance, net of tax	(5,370)	(5,251)	(5,182)
American Airlines, Inc. [Member] | Pension, Retiree Medical and Other Postretirement Benefits [Member]
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	(4,508)	(4,394)
Other comprehensive income (loss) before reclassifications, before tax	(61)	(27)
Amounts reclassified from AOCI, before tax	(89)	(87)
Net current-period other comprehensive income (loss), before tax	(150)	(114)
Ending balance, before tax	(4,658)	(4,508)	(4,394)
American Airlines, Inc. [Member] | Unrealized Gain/(Loss) on Investments [Member]
AOCI attributable to parent, before tax [Roll Forward]
Beginning balance, before tax	(1)	0
Other comprehensive income (loss) before reclassifications, before tax	(4)	(1)
Amounts reclassified from AOCI, before tax	0	0
Net current-period other comprehensive income (loss), before tax	(4)	(1)
Ending balance, before tax	$ (5)	$ (1)	$ 0

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Loss - Reclassifications out of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	$ (69)	$ (55)
Prior Service Benefit [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	(161)	(132)
Actuarial Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	92	77
American Airlines, Inc. [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	(69)	(55)
American Airlines, Inc. [Member] | Prior Service Benefit [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	(161)	(132)
American Airlines, Inc. [Member] | Actuarial Loss [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax	$ 92	$ 77

Commitments, Contingencies an_3

Commitments, Contingencies and Guarantees - Aircraft, Engine and Other Purchase Commitments (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Purchase Obligations
Equipment purchase deposits	$ 1,278	$ 1,217
Jet Fuel, Facility Construction Projects and Information Technology Support [Member]
Unrecorded Unconditional Purchase Obligations
2,019	1,900
2,020	1,100
2,021	1,000
2,022	32
2,023	7
American Airlines, Inc. [Member]
Purchase Obligations
Equipment purchase deposits	1,277	$ 1,217
American Airlines, Inc. [Member] | Jet Fuel, Facility Construction Projects and Information Technology Support [Member]
Unrecorded Unconditional Purchase Obligations
2,019	1,900
2,020	1,100
2,021	1,000
2,022	32
2,023	7
American Airlines, Inc. [Member] | Aircraft and Engine Purchase Commitments [Member]
Purchase Obligations
2,019	2,906
2,020	1,683
2,021	994
2,022	1,378
2,023	1,450
2024 and Thereafter	6,047
Total	$ 14,458

Commitments, Contingencies an_4

Commitments, Contingencies and Guarantees - Capacity Purchase Agreements (Details) - Airline Capacity Purchase Arrangements [Member] $ in Millions	Dec. 31, 2018USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
Capacity purchase agreement, percentage of reimbursement for certain variable costs	100.00%
2,019	$ 1,101
2,020	930
2,021	765
2,022	618
2,023	487
2024 and Thereafter	1,043
Total	$ 4,944
American Airlines, Inc. [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Capacity purchase agreement, percentage of reimbursement for certain variable costs	100.00%
2,019	$ 1,101
2,020	930
2,021	765
2,022	618
2,023	487
2024 and Thereafter	1,043
Total	$ 4,944

Commitments, Contingencies an_5

Commitments, Contingencies and Guarantees - Additional Information (Details) shares in Millions	Feb. 12, 2019shares	Jun. 15, 2018USD ($)	Jun. 30, 2015lawsuit	Dec. 31, 2018USD ($)EmployeesAircraftsecurity_screening_lane	Dec. 31, 2017USD ($)
Long-term Purchase Commitment [Line Items]
Airport development, amount				$ 1,600,000,000
Airport redevelopment, number of security screening lanes | security_screening_lane				16
Airport redevelopment, costs incurred and capitalized				$ 7,000,000
Number of aircraft owned through financing under EETC | Aircraft				389
Number of aircraft operating leased under trusts | Aircraft				88
Long-term debt				$ 24,001,000,000	$ 24,530,000,000
Operating lease liabilities				9,556,000,000
Letters of credit outstanding and surety bonds, amount				$ 460,000,000
Number of putative class action lawsuits | lawsuit			100
Settlement amount		$ 45,000,000
Number of full-time equivalent employees | Employees				128,900
Percentage of employees covered by collective bargaining agreements with various labor unions				84.00%
Percentage of employees covered by collective bargaining agreements that will become amendable within one year				22.00%
Regional Carrier [Member]
Long-term Purchase Commitment [Line Items]
Number of full-time equivalent employees | Employees				26,000
Subsequent Event [Member]
Long-term Purchase Commitment [Line Items]
Shares distributed from Disputed Claims Reserve | shares	17.3
Shares reserved for issuance in Disputed Claims Reserve | shares	7.2
EETC Leveraged Lease Financings [Member]
Long-term Purchase Commitment [Line Items]
Operating lease liabilities				$ 352,000,000
Special Facility Revenue Bonds [Member]
Long-term Purchase Commitment [Line Items]
Operating lease liabilities				321,000,000
Guarantor obligations, maximum exposure, undiscounted				588,000,000
Secured Debt [Member]
Long-term Purchase Commitment [Line Items]
Long-term debt				22,751,000,000	22,780,000,000
Unsecured Debt [Member]
Long-term Purchase Commitment [Line Items]
Long-term debt				1,250,000,000	1,750,000,000
Enhanced Equipment Trust Certificates (EETC) [Member] | Secured Debt [Member]
Long-term Purchase Commitment [Line Items]
Long-term debt				11,648,000,000	11,881,000,000
Special Facility Revenue Bonds [Member] | Secured Debt [Member]
Long-term Purchase Commitment [Line Items]
Long-term debt				798,000,000	857,000,000
Guarantor obligations, maximum exposure, undiscounted				769,000,000
Credit Facilities And Certain EETC Financings [Member] | Secured Debt [Member]
Long-term Purchase Commitment [Line Items]
Guarantor obligations, maximum exposure, undiscounted				8,400,000,000
Senior Notes 5.50% Due in 2019 [Member] | Unsecured Debt [Member]
Long-term Purchase Commitment [Line Items]
Long-term debt				$ 750,000,000	750,000,000
Fixed interest rate				5.50%
Senior Notes 4.625% Due in 2020 [Member] | Unsecured Debt [Member]
Long-term Purchase Commitment [Line Items]
Long-term debt				$ 500,000,000	500,000,000
Fixed interest rate				4.625%
American Airlines, Inc. [Member]
Long-term Purchase Commitment [Line Items]
Airport development, amount				$ 1,600,000,000
Airport redevelopment, number of security screening lanes | security_screening_lane				16
Airport redevelopment, costs incurred and capitalized				$ 7,000,000
Number of aircraft owned through financing under EETC | Aircraft				389
Number of aircraft operating leased under trusts | Aircraft				88
Long-term debt				$ 22,722,000,000
Operating lease liabilities				$ 9,496,000,000
Number of putative class action lawsuits | lawsuit			100
Settlement amount		$ 45,000,000
Number of full-time equivalent employees | Employees				102,900
Percentage of employees covered by collective bargaining agreements with various labor unions				84.00%
Percentage of employees covered by collective bargaining agreements that will become amendable within one year				24.00%
American Airlines, Inc. [Member] | EETC Leveraged Lease Financings [Member]
Long-term Purchase Commitment [Line Items]
Operating lease liabilities				$ 352,000,000
American Airlines, Inc. [Member] | Special Facility Revenue Bonds [Member]
Long-term Purchase Commitment [Line Items]
Operating lease liabilities				321,000,000
American Airlines, Inc. [Member] | Secured Debt [Member]
Long-term Purchase Commitment [Line Items]
Long-term debt				22,722,000,000	22,750,000,000
American Airlines, Inc. [Member] | Enhanced Equipment Trust Certificates (EETC) [Member] | Secured Debt [Member]
Long-term Purchase Commitment [Line Items]
Long-term debt				11,648,000,000	11,881,000,000
American Airlines, Inc. [Member] | Special Facility Revenue Bonds [Member] | Secured Debt [Member]
Long-term Purchase Commitment [Line Items]
Long-term debt				769,000,000	$ 828,000,000
American Airlines, Inc. [Member] | Senior Notes 5.50% Due in 2019 [Member] | Unsecured Debt [Member]
Long-term Purchase Commitment [Line Items]
Guarantor obligations, maximum exposure, undiscounted				750,000,000
American Airlines, Inc. [Member] | Senior Notes 4.625% Due in 2020 [Member] | Unsecured Debt [Member]
Long-term Purchase Commitment [Line Items]
Guarantor obligations, maximum exposure, undiscounted				$ 500,000,000

Supplemental Cash Flow Inform_3

Supplemental Cash Flow Information - Cash Flow Information and Non-Cash Investing and Financing Activities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Non-cash investing and financing activities:
Equity investment	$ 0	$ 120	$ 0
Settlement of bankruptcy obligations	0	15	3
Supplemental information:
Interest paid, net	1,091	1,040	964
Income taxes paid	18	20	16
American Airlines, Inc. [Member]
Non-cash investing and financing activities:
Equity investment	0	120	0
Settlement of bankruptcy obligations	0	15	3
Supplemental information:
Interest paid, net	1,009	942	867
Income taxes paid	$ 16	$ 18	$ 14

Operating Segments and Relate_2

Operating Segments and Related Disclosures - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018Segments
Segment Reporting Information [Line Items]
Number of operating segments	1
American Airlines, Inc. [Member]
Segment Reporting Information [Line Items]
Number of operating segments	1

Share Based Compensation - Addi

Share Based Compensation - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation costs	$ 88	$ 90	$ 102
Common stock withheld or sold related to tax obligations (in shares)	800,000	1,100,000	1,400,000
Payment of certain tax withholding obligations associated with employee equity awards	$ 37	$ 51	$ 56
AAG Incentive Award Plan 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for grant (in shares)				40,000,000
American Airlines, Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation costs	$ 88	$ 90	$ 102
Common stock withheld or sold related to tax obligations (in shares)	800,000	1,100,000	1,400,000
Payment of certain tax withholding obligations associated with employee equity awards	$ 37	$ 51	$ 56
American Airlines, Inc. [Member] | AAG Incentive Award Plan 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for grant (in shares)				40,000,000

Share Based Compensation - Rest

Share Based Compensation - Restricted Stock Unit Awards (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Number of Shares [Roll Forward]
Number of Shares, Beginning Balance (in shares)	4,324	5,187	5,607
Number of Shares, Granted (in shares)	2,194	2,309	2,655
Number of Shares, Vested and released (in shares)	(1,999)	(2,708)	(2,754)
Number of Shares, Forfeited (in shares)	(199)	(464)	(321)
Number of Shares, Ending balance (in shares)	4,320	4,324	5,187
Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, Beginning Balance (in dollars per share)	$ 46.94	$ 41.48	$ 38.08
Weighted Average Grant Date Fair Value, Granted (in dollars per share)	47.65	48.58	41.34
Weighted Average Grant Date Fair Value, Vested and released (in dollars per share)	44.99	39.63	34.83
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share)	45.72	44.48	40.15
Weighted Average Grant Date Fair Value, Ending balance (in dollars per share)	$ 44.29	$ 46.94	$ 41.48
Unrecognized compensation cost	$ 111
Recognition period	1 year
Total fair value of stock-settled during the year	$ 91	$ 123	$ 107
American Airlines, Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Number of Shares [Roll Forward]
Number of Shares, Beginning Balance (in shares)	4,324	5,187	5,607
Number of Shares, Granted (in shares)	2,194	2,309	2,655
Number of Shares, Vested and released (in shares)	(1,999)	(2,708)	(2,754)
Number of Shares, Forfeited (in shares)	(199)	(464)	(321)
Number of Shares, Ending balance (in shares)	4,320	4,324	5,187
Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, Beginning Balance (in dollars per share)	$ 46.94	$ 41.48	$ 38.08
Weighted Average Grant Date Fair Value, Granted (in dollars per share)	47.65	48.58	41.34
Weighted Average Grant Date Fair Value, Vested and released (in dollars per share)	44.99	39.63	34.83
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share)	45.72	44.48	40.15
Weighted Average Grant Date Fair Value, Ending balance (in dollars per share)	$ 44.29	$ 46.94	$ 41.48
Unrecognized compensation cost	$ 111
Recognition period	1 year
Total fair value of stock-settled during the year	$ 91	$ 123	$ 107

Valuation and Qualifying Acco_3

Valuation and Qualifying Accounts - Components of Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for obsolescence of spare parts [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 769	$ 765	$ 728
Additions Charged to Statement of Operations Accounts	70	29	37
Deductions	(25)	(25)	0
Balance at End of Year	814	769	765
Allowance for uncollectible accounts [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	24	36	41
Additions Charged to Statement of Operations Accounts	42	43	47
Deductions	(37)	(55)	(52)
Balance at End of Year	29	24	36
American Airlines, Inc. [Member] | Allowance for obsolescence of spare parts [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	717	720	689
Additions Charged to Statement of Operations Accounts	57	18	28
Deductions	(20)	(21)	3
Balance at End of Year	754	717	720
American Airlines, Inc. [Member] | Allowance for uncollectible accounts [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	21	35	37
Additions Charged to Statement of Operations Accounts	39	41	47
Deductions	(36)	(55)	(49)
Balance at End of Year	$ 24	$ 21	$ 35

Quarterly Financial Data - Summ

Quarterly Financial Data - Summarized Financial Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Selected Quarterly Financial Information [Line Items]
Operating revenues	$ 10,938	$ 11,559	$ 11,643	$ 10,401	$ 10,611	$ 10,965	$ 11,227	$ 9,820	$ 44,541	$ 42,622	$ 40,142
Operating expenses	10,367	10,874	10,639	10,005	9,973	9,709	9,628	9,083	41,885	38,391	35,082
Operating income	571	685	1,004	396	638	1,256	1,599	737	2,656	4,231	5,060
Net income	$ 325	$ 372	$ 556	$ 159	$ (583)	$ 661	$ 864	$ 340	$ 1,412	$ 1,282	$ 2,584
Earnings per share:
Basic (in dollars per share)	$ 0.71	$ 0.81	$ 1.20	$ 0.34	$ (1.22)	$ 1.36	$ 1.76	$ 0.67	$ 3.04	$ 2.62	$ 4.68
Diluted (in dollars per share)	$ 0.70	$ 0.81	$ 1.20	$ 0.34	$ (1.22)	$ 1.36	$ 1.75	$ 0.67	$ 3.03	$ 2.61	$ 4.65
Shares used for computation:
Basic (in shares)	460,589	460,526	463,533	472,297	477,165	484,772	490,818	503,902	464,236	489,164	552,308
Diluted (in shares)	461,915	461,507	464,618	474,598	477,165	486,625	492,965	507,797	465,660	491,692	556,099
American Airlines, Inc. [Member]
Selected Quarterly Financial Information [Line Items]
Operating revenues	$ 10,936	$ 11,556	$ 11,640	$ 10,398	$ 10,607	$ 10,962	$ 11,224	$ 9,817	$ 44,530	$ 42,610	$ 40,125
Operating expenses	10,344	10,850	10,626	9,986	9,982	9,713	9,633	9,077	41,807	38,405	35,045
Operating income	592	706	1,014	412	625	1,249	1,591	740	2,723	4,205	5,080
Net income	$ 407	$ 433	$ 609	$ 209	$ (658)	$ 686	$ 888	$ 369	$ 1,658	$ 1,285	$ 2,689

Quarterly Financial Data - Addi

Quarterly Financial Data - Additional Information (Details) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)$ / Employees	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Restructuring Cost and Reserve [Line Items]
Operating and nonoperating special items, net	$ 225	$ 1,100
Fleet restructuring expenses	146	58	$ 422	$ 232	$ 177
Merger integration expenses	81	81	268	273	514
Severance costs	37		58	0	0
Mark-to-market net unrealized losses on equity investments	22		104	0	0
Net credit (charge) resulting from mark-to-market adjustments for bankruptcy obligations	37	(20)	76	(27)	(25)
Income tax credit, reversal of valuation allowance			6	3	(7)
Employee tax reform bonus expense		$ 149
Tax reform bonus, amount per employee | $ / Employees		1,000
Impact of Tax Act, charge to reduce deferred tax assets		$ 823	0	823	0
Alternative Minimum Tax Credit Carryforward [Member]
Restructuring Cost and Reserve [Line Items]
Income tax credit, reversal of valuation allowance	22
American Airlines, Inc. [Member]
Restructuring Cost and Reserve [Line Items]
Operating and nonoperating special items, net	220	1,200
Fleet restructuring expenses	146	58	422	232	177
Merger integration expenses	81	81	268	273	514
Severance costs	37		58	0	0
Mark-to-market net unrealized losses on equity investments	22		104	0	0
Net credit (charge) resulting from mark-to-market adjustments for bankruptcy obligations	37	(20)	76	(27)	(25)
Income tax credit, reversal of valuation allowance	$ 22		6	(4)	1
Employee tax reform bonus expense		$ 123
Tax reform bonus, amount per employee | $ / Employees		1,000
Impact of Tax Act, charge to reduce deferred tax assets		$ 924	$ 0	$ 924	$ 0

Transactions with Related Par_3

Transactions with Related Parties (Details) - American Airlines, Inc. [Member] - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Net receivables (payables) to related parties	$ 10,666	$ 8,822
AAG [Member]
Related Party Transaction [Line Items]
Net receivables (payables) to related parties	12,808	10,968
AAG's Wholly-owned Subsidiaries [Member]
Related Party Transaction [Line Items]
Net receivables (payables) to related parties	$ (2,142)	$ (2,146)

Transactions with Related Par_4

Transactions with Related Parties - Additional Information (Details) - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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	$ 1.8	$ 1.7	$ 1.5

Subsequent Event - Additional I

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

1 Months Ended

3 Months Ended

12 Months Ended

Jan. 31, 2019

Dec. 31, 2018

Sep. 30, 2018

Jun. 30, 2018

Mar. 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, 2018

Dec. 31, 2017

Dec. 31, 2016

Subsequent Event [Line Items]

Dividends declared on common stock (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

$ 0.4

$ 0.4

$ 0.4

Subsequent Event [Member]

Subsequent Event [Line Items]

Dividends declared on common stock (in dollars per share)

$ 0.10

Uncategorized Items - aal-20181

Label	Element	Value
Accounting Standards Update 2016-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 418,000,000
Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	418,000,000
Accounting Standards Update 2016-09 [Member] | Subsidiaries [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	418,000,000
Accounting Standards Update 2016-09 [Member] | Subsidiaries [Member] | Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 418,000,000