Retirement Benefits - Schedule of Amounts Recognized in Consolidated Balance Sheets (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Other post-employment benefits, noncurrent liability	$ 17	$ 18
Prior service costs	1	2
American Airlines, Inc. [Member]
Defined Benefit Plan Disclosure [Line Items]
Other post-employment benefits, noncurrent liability	17	18
Prior service costs	$ 1	$ 2