Income Taxes - Components of Income Tax Provision (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current income tax provision:
State and Local	$ 3	$ 10	$ 3
Foreign	29	14	9
Current income tax provision	32	24	12
Deferred income tax provision:
Federal	390	2,026	1,456
State and Local	50	63	100
Deferred income tax provision	440	2,089	1,556
Total income tax provision	472	2,113	1,568
American Airlines, Inc. [Member]
Current income tax provision:
State and Local	3	14	1
Foreign	28	10	9
Current income tax provision	31	24	10
Deferred income tax provision:
Federal	453	2,176	1,507
State and Local	50	70	90
Deferred income tax provision	503	2,246	1,597
Total income tax provision	$ 534	$ 2,270	$ 1,607