Employee Benefit Plans - Components of Net Periodic Benefit Cost (Income) (Parenthetical) (Detail) - Retiree Medical And Other Postretirement Benefits [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service costs excluded from net periodic cost	$ 1	$ 3	$ 14
American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service costs excluded from net periodic cost	$ 1	$ 3	$ 14