Employee Benefit Plans - Schedule of Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liability	$ 3,044	$ 2,837
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liability	5	4
Noncurrent liability	1,974	2,149
Total liabilities	1,979	2,153
Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liability	122	85
Noncurrent liability	1,070	688
Total liabilities	1,192	773
American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liability	3,020	2,811
American Airlines, Inc. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liability	6	4
Noncurrent liability	1,950	2,123
Total liabilities	1,956	2,127
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liability	122	85
Noncurrent liability	1,070	688
Total liabilities	$ 1,192	$ 773