Share-based Compensation Share-based Compensation - ASU 2016-09 (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net deferred tax asset	$ 394	$ 1,487
American Airlines, Inc. [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net deferred tax asset	$ 647	$ 1,898
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net deferred tax asset			$ 418
Accounting Standards Update 2016-09 [Member] | American Airlines, Inc. [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net deferred tax asset			418
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption			418
Retained Earnings [Member] | Accounting Standards Update 2016-09 [Member] | American Airlines, Inc. [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption			$ 418