Income Taxes - Components of Income Tax Provision (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current income tax provision (benefit):
State and Local	$ 0	$ 2	$ 3
Foreign	0	8	29
Current income tax provision (benefit)	0	10	32
Deferred income tax provision (benefit):
Federal	(2,335)	498	390
State and Local	(233)	62	50
Deferred income tax provision (benefit)	(2,568)	560	440
Total income tax provision (benefit)	(2,568)	570	472
American Airlines, Inc.
Current income tax provision (benefit):
State and Local	0	2	3
Foreign	0	8	28
Current income tax provision (benefit)	0	10	31
Deferred income tax provision (benefit):
Federal	(2,224)	567	453
State and Local	(229)	56	50
Deferred income tax provision (benefit)	(2,453)	623	503
Total income tax provision (benefit)	$ (2,453)	$ 633	$ 534