Condensed Consolidated Statements of Stockholders' Deficit - USD ($) $ in Millions	Total	At-The-Market Offering	Public Stock Offering	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Common Stock Public Stock Offering	Additional Paid-in Capital	Additional Paid-in Capital At-The-Market Offering	Additional Paid-in Capital Public Stock Offering	Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Retained Deficit	Retained Deficit Cumulative Effect, Period of Adoption, Adjustment	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 Deficit
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 income, net	(149)										(149)			(149)			(149)
Issuance of shares of AAG common stock pursuant to employee stock plans net of shares withheld for cash taxes	(13)						(13)
Share-based compensation expense	18						18							18		18
Purchase and retirement of AAG common stock	(145)						(145)
Dividends declared on AAG common stock	(44)											(44)
Settlement of single-dip unsecured claims held in Disputed Claims Reserve	56						56
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)	(4,308)													(4,137)
Other comprehensive income, net	(132)													(132)
Ending balance at Jun. 30, 2020	(3,169)				5		5,377				(6,463)	(2,088)		9,258	0	17,008	(6,555)	(1,195)
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 income, net	17										17			17			17
Issuance of AAG common stock, net of offering costs			$ 1,113			$ 1			$ 1,112
Issuance of Warrants	55						55
Equity component of convertible debt issued, net of tax and offering costs	320						320
Issuance of shares of AAG common stock pursuant to employee stock plans net of shares withheld for cash taxes	(2)						(2)
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)
Beginning balance at Dec. 31, 2020	(6,867)			$ (301)	6		6,894			$ (320)	(7,103)	(6,664)	$ 19	4,348	0	17,050	(7,194)	(5,508)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1,250)											(1,250)		(1,215)				(1,215)
Other comprehensive income, net	$ 67										67			66			66
Accounting Standards Update [Extensible List]
Issuance of AAG common stock, net of offering costs		$ 316						$ 316
Issuance of Warrants	$ 65						65
Issuance of shares of AAG common stock pursuant to employee stock plans net of shares withheld for cash taxes	(13)						(13)
Share-based compensation expense	38						38							38		38
Ending balance at Mar. 31, 2021	(7,945)				6		6,980				(7,036)	(7,895)		3,237	0	17,088	(7,128)	(6,723)
Beginning balance at Dec. 31, 2020	(6,867)			$ (301)	6		6,894			$ (320)	(7,103)	(6,664)	$ 19	4,348	0	17,050	(7,194)	(5,508)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1,231)													(1,165)
Other comprehensive income, net	106													105
Ending balance at Jun. 30, 2021	(7,667)				6		7,200				(6,997)	(7,876)		3,347	0	17,108	(7,089)	(6,672)
Beginning balance at Mar. 31, 2021	(7,945)				6		6,980				(7,036)	(7,895)		3,237	0	17,088	(7,128)	(6,723)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	19											19		51				51
Other comprehensive income, net	39										39			39			39
Issuance of AAG common stock, net of offering costs			$ 144			$ 0			$ 144
Issuance of Warrants	56						56
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	20						20							20		20
Ending balance at Jun. 30, 2021	$ (7,667)				$ 6		$ 7,200				$ (6,997)	$ (7,876)		$ 3,347	$ 0	$ 17,108	$ (7,089)	$ (6,672)