Condensed Consolidated Statements of Stockholders' Deficit - USD ($) $ in Millions	Total	PSP1 Warrants	PSP2 Warrants	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 PSP1 Warrants	Additional Paid-in Capital PSP2 Warrants	Additional Paid-in Capital Treasury Loan Warrant	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 (DCR)	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)	(6,707)																		(6,413)
Other comprehensive income, net	(145)																		(146)
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 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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(2,399)																(2,399)		(2,276)				(2,276)
Other comprehensive income, net	(13)															(13)			(14)			(14)
Issuance of Warrants		$ 8								$ 8		$ 25
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 Sep. 30, 2020	(5,528)						5		5,430							(6,476)	(4,487)		6,988	0	17,028	(6,569)	(3,471)
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)	(1,061)																		(884)
Other comprehensive income, net	146																		145
Ending balance at Sep. 30, 2021	(7,437)						6		7,221							(6,957)	(7,707)		3,688	0	17,129	(7,049)	(6,392)
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)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	169																169		280				280
Other comprehensive income, net	40															40			40			40
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	21								21										21		21
Ending balance at Sep. 30, 2021	$ (7,437)						$ 6		$ 7,221							$ (6,957)	$ (7,707)		$ 3,688	$ 0	$ 17,129	$ (7,049)	$ (6,392)