Employee Benefit Plans - Schedule of Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liability	$ 2,128	$ 3,044
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liability	5	5
Noncurrent liability	1,090	1,974
Total liabilities	1,095	1,979
Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liability	142	122
Noncurrent liability	1,038	1,070
Total liabilities	1,180	1,192
American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liability	2,115	3,020
American Airlines, Inc. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liability	5	6
Noncurrent liability	1,078	1,950
Total liabilities	1,083	1,956
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liability	142	122
Noncurrent liability	1,037	1,070
Total liabilities	$ 1,179	$ 1,192