Employee Benefit Plans Employee Benefit Plans - Profit Sharing Program (Details) - Deferred Profit Sharing [Member] $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Pre-tax income excluding special items for employee profit sharing, percentage	5.00%
Employee profit sharing program, amount	$ 241
American Airlines, Inc. [Member]
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Pre-tax income excluding special items for employee profit sharing, percentage	5.00%
Employee profit sharing program, amount	$ 241