Condensed Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Millions	Total	Payroll Support Program Warrants	Treasury Loan Warrants	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital Payroll Support Program Warrants	Additional Paid-in Capital Treasury Loan Warrants	Accumulated Other Comprehensive Loss	Retained Earnings (Deficit)	American Airlines, Inc.	American Airlines, Inc. Common Stock	American Airlines, Inc. Additional Paid-in Capital	American Airlines, Inc. Accumulated Other Comprehensive Loss	American Airlines, Inc. Retained Earnings (Deficit)
Beginning Balance at Dec. 31, 2018	$ (169)			$ 5	$ 4,964			$ (5,896)	$ 758	$ 11,770	$ 0	$ 16,802	$ (5,992)	$ 960
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	185								185	230				230
Other comprehensive loss, net	(13)							(13)		(13)			(13)
Purchase and retirement of AAG common stock	(610)				(610)
Dividends declared on AAG common stock	(46)								(46)
Issuance of shares of AAG common stock pursuant to employee stock plans net of shares withheld for cash taxes	(8)				(8)
Share-based compensation expense	25				25					25		25
Ending Balance at Mar. 31, 2019	(636)			5	4,371			(5,909)	897	12,012	0	16,827	(6,005)	1,190
Beginning Balance at Dec. 31, 2018	(169)			5	4,964			(5,896)	758	11,770	0	16,802	(5,992)	960
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,272									1,452
Other comprehensive loss, net	(50)									(50)
Ending Balance at Sep. 30, 2019	160			4	4,208			(5,946)	1,894	13,260	0	16,881	(6,042)	2,421
Beginning Balance at Mar. 31, 2019	(636)			5	4,371			(5,909)	897	12,012	0	16,827	(6,005)	1,190
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	662								662	714				714
Other comprehensive loss, net	(18)							(18)		(18)			(18)
Dividends declared on AAG common stock	(45)								(45)
Issuance of shares of AAG common stock pursuant to employee stock plans net of shares withheld for cash taxes	(17)				(17)
Settlement of single-dip unsecured claims held in Disputed Claims Reserve	7				7
Share-based compensation expense	25				25					25		25
Intercompany equity transfer										7		7
Ending Balance at Jun. 30, 2019	(22)			5	4,386			(5,927)	1,514	12,740	0	16,859	(6,023)	1,904
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	425								425	508				508
Other comprehensive loss, net	(19)							(19)		(19)			(19)
Purchase and retirement of AAG common stock	(201)			(1)	(200)
Dividends declared on AAG common stock	(45)								(45)
Issuance of shares of AAG common stock pursuant to employee stock plans net of shares withheld for cash taxes	0				0
Share-based compensation expense	22				22					22		22
Intercompany equity transfer										9		0		9
Ending Balance at Sep. 30, 2019	160			4	4,208			(5,946)	1,894	13,260	0	16,881	(6,042)	2,421
Beginning Balance at Dec. 31, 2019	(118)			4	3,945			(6,331)	2,264	13,422	0	16,903	(6,423)	2,942
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(2,241)								(2,241)	(2,169)				(2,169)
Other comprehensive loss, net	(149)							(149)		(149)			(149)
Purchase and retirement of AAG common stock	(145)				(145)
Dividends declared on AAG common stock	(44)								(44)
Issuance of shares of AAG common stock pursuant to employee stock plans net of shares withheld for cash taxes	(13)				(13)
Settlement of single-dip unsecured claims held in Disputed Claims Reserve	56				56
Share-based compensation expense	18				18					18		18
Intercompany equity transfer										56		56
Ending Balance at Mar. 31, 2020	(2,636)			4	3,861			(6,480)	(21)	11,178	0	16,977	(6,572)	773
Beginning Balance at Dec. 31, 2019	(118)			4	3,945			(6,331)	2,264	13,422	0	16,903	(6,423)	2,942
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(6,707)									(6,413)
Other comprehensive loss, net	(145)									(146)
Purchase and retirement of AAG common stock	(145)
Issuance of AAG common stock pursuant to a public stock offering, net of offering costs	1,100
Ending Balance at Sep. 30, 2020	(5,528)			5	5,430			(6,476)	(4,487)	6,988	0	17,028	(6,569)	(3,471)
Beginning Balance at Mar. 31, 2020	(2,636)			4	3,861			(6,480)	(21)	11,178	0	16,977	(6,572)	773
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(2,067)								(2,067)	(1,968)				(1,968)
Other comprehensive loss, net	17							17		17			17
Settlement of single-dip unsecured claims held in Disputed Claims Reserve	(2)				(2)
Warrants	55				55
Equity component of convertible debt issued, net of tax and offering costs	320				320
Issuance of AAG common stock pursuant to a public stock offering, net of offering costs	1,113			1	1,112
Share-based compensation expense	31				31					31		31
Ending Balance at Jun. 30, 2020	(3,169)			5	5,377			(6,463)	(2,088)	9,258	0	17,008	(6,555)	(1,195)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(2,399)								(2,399)	(2,276)				(2,276)
Other comprehensive loss, net	(13)							(13)		(14)			(14)
Issuance of shares of AAG common stock pursuant to employee stock plans net of shares withheld for cash taxes	0				0
Warrants		$ 8	$ 25			$ 8	$ 25
Share-based compensation expense	20				20					20		20
Ending Balance at Sep. 30, 2020	$ (5,528)			$ 5	$ 5,430			$ (6,476)	$ (4,487)	$ 6,988	$ 0	$ 17,028	$ (6,569)	$ (3,471)