Income Taxes - Components of Income Tax Provision (Benefit) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current income tax provision:
Federal	$ 0	$ 0	$ 0
State and Local	24	12	20
Current income tax provision (benefit)	24	12	20
Deferred income tax provision (benefit):
Federal	1,085	1,508	(2,884)
State and Local	56	103	(130)
Deferred income tax provision (benefit)	1,141	1,611	(3,014)
Income tax provision (benefit)	1,165	1,623	(2,994)
American Airlines, Inc. [Member]
Current income tax provision:
Federal	0	0	0
State and Local	24	10	15
Current income tax provision (benefit)	24	10	15
Deferred income tax provision (benefit):
Federal	1,235	1,559	(3,407)
State and Local	63	93	(60)
Deferred income tax provision (benefit)	1,298	1,652	(3,467)
Income tax provision (benefit)	$ 1,322	$ 1,662	$ (3,452)