Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Millions	Total	Public Stock Offering	At-the-market Offering	Issuance of PSP1 Warrants (see Note 1(b))	Issuance of Treasury Loan Warrants (see Note 1(b))	Cumulative Effect, Period of Adoption, Adjustment	American Airlines, Inc.	American Airlines, Inc. Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Common Stock Public Stock Offering	Common Stock At-the-market Offering	Common Stock American Airlines, Inc.	Additional Paid-in Capital	Additional Paid-in Capital Public Stock Offering	Additional Paid-in Capital At-the-market Offering	Additional Paid-in Capital Issuance of PSP1 Warrants (see Note 1(b))	Additional Paid-in Capital Issuance of Treasury Loan Warrants (see Note 1(b))	Additional Paid-in Capital American Airlines, Inc.	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss American Airlines, Inc.	Retained Earnings (Deficit)	Retained Earnings (Deficit) Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings (Deficit) American Airlines, Inc.	Retained Earnings (Deficit) American Airlines, Inc. Cumulative Effect, Period of Adoption, Adjustment
Beginning Balance at Dec. 31, 2017	$ (780)						$ 9,888		$ 5			$ 0	$ 5,714					$ 16,716	$ (5,776)	$ (5,873)	$ (723)		$ (955)
Beginning Balance (Accounting Standards Update 2016-01) at Dec. 31, 2017						$ 60		$ 60														$ 60		$ 60
Beginning Balance (Accounting Standards Update 2016-02) at Dec. 31, 2017						$ 197		$ 197														$ 197		$ 197
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,412						1,658														1,412		1,658
Other comprehensive loss, net	(120)						(119)												(120)	(119)
Issuance of shares of AAG common stock pursuant to employee stock plans net of shares withheld for cash taxes	(37)												(37)
Purchase and retirement of AAG common stock	(799)								0				(799)
Dividends declared on AAG common stock	(188)																				(188)
Settlement of single-dip unsecured claims held in Disputed Claims Reserve	86												86
Share-based compensation expense							86											86
Ending Balance at Dec. 31, 2018	(169)						11,770		5			0	4,964					16,802	(5,896)	(5,992)	758		960
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	1,686						1,972														1,686		1,972
Other comprehensive loss, net	(435)						(431)												(435)	(431)
Issuance of shares of AAG common stock pursuant to employee stock plans net of shares withheld for cash taxes	(25)												(25)
Purchase and retirement of AAG common stock	(1,096)								(1)				(1,095)
Dividends declared on AAG common stock	(180)																				(180)
Settlement of single-dip unsecured claims held in Disputed Claims Reserve	7												7
Share-based compensation expense	94						94						94					94
Intercompany equity transfer							17											7					10
Ending Balance at Dec. 31, 2019	(118)						13,422		4			0	3,945					16,903	(6,331)	(6,423)	2,264		2,942
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(8,885)						(8,450)														(8,885)		(8,450)
Other comprehensive loss, net	(772)						(771)												(772)	(771)
Warrants				$ 63	$ 25											$ 63	$ 25
Issuance of shares of AAG common stock pursuant to employee stock plans net of shares withheld for cash taxes	(15)												(15)
Issuance of AAG common stock, net of offering costs		$ 1,687	$ 869							$ 1	$ 1			$ 1,686	$ 868
Equity component of convertible debt issued, net of tax and offering costs	320												320
Purchase and retirement of AAG common stock	(145)								0				(145)
Dividends declared on AAG common stock	(43)																				(43)
Settlement of single-dip unsecured claims held in Disputed Claims Reserve	56												56
Share-based compensation expense	91						91						91					91
Intercompany equity transfer							56											56					0
Ending Balance at Dec. 31, 2020	$ (6,867)						$ 4,348		$ 6			$ 0	$ 6,894					$ 17,050	$ (7,103)	$ (7,194)	$ (6,664)		$ (5,508)