Income Taxes - Computation of Income Tax Provision (Benefit) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Line Items]
Statutory income tax provision	$ 1,079	$ 1,505	$ 1,616
State income tax provision, net of federal tax effect	61	63	72
Book expenses (benefits) not deductible for tax purposes	33	34	57
Bankruptcy administration expenses	1	1	3
2017 Tax Act	(7)	0	0
Change in valuation allowance	(3)	7	(4,742)
Other, net	1	13	0
Income tax provision (benefit)	1,165	1,623	(2,994)
American Airlines, Inc. [Member]
Income Tax Disclosure [Line Items]
Statutory income tax provision	1,135	1,555	1,635
State income tax provision, net of federal tax effect	54	67	71
Book expenses (benefits) not deductible for tax purposes	30	32	55
Bankruptcy administration expenses	1	1	3
2017 Tax Act	93	0	0
Change in valuation allowance	4	(1)	(5,216)
Other, net	5	8	0
Income tax provision (benefit)	$ 1,322	$ 1,662	$ (3,452)