Bankruptcy Settlement Obligations - Components of Bankruptcy Settlement Obligations (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014	Dec. 09, 2013
Bankruptcy Settlement Obligations [Line Items]
Single-dip equity obligations	$ 135	$ 248	$ 2,500
Labor-related deemed claim	42	77
Total	177	325
American Airlines, Inc. [Member]
Bankruptcy Settlement Obligations [Line Items]
Single-dip equity obligations	135	248	$ 2,500
Labor-related deemed claim	42	77
Total	$ 177	$ 325