Quarterly Financial Data - Additional Information (Detail) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2017 USD ($) $ / Employees	Dec. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Operating and nonoperating special charges, net	$ 307	$ 273
Employee tax reform bonus expense	$ 149
Tax reform bonus, amount per employee | $ / Employees	1,000
Merger integration expenses	$ 81	121	$ 273	$ 514	$ 826
Fleet restructuring expenses	58	104	232	177	210
Net charge resulting from fair value adjustments to bankruptcy obligations	20	47
Impact of the 2017 Tax Act on deferred tax assets and liabilities	(7)		(7)	0	0
American Airlines, Inc. [Member]
Restructuring Cost and Reserve [Line Items]
Operating and nonoperating special charges, net	384	273
Employee tax reform bonus expense	$ 123
Tax reform bonus, amount per employee | $ / Employees	1,000
Merger integration expenses	$ 81	121	273	514	826
Fleet restructuring expenses	58	104	232	177	210
Net charge resulting from fair value adjustments to bankruptcy obligations	20	$ 47
Impact of the 2017 Tax Act on deferred tax assets and liabilities	$ 93		$ 93	$ 0	$ 0