Employee Benefit Plans - Schedule of Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liability	$ 1,568	$ 2,128
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liability	4	5
Noncurrent liability	535	1,090
Total liabilities	539	1,095
Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liability	108	142
Noncurrent liability	1,033	1,038
Total liabilities	1,141	1,180
American Airlines, Inc.
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liability	1,566	2,115
American Airlines, Inc. | Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liability	4	5
Noncurrent liability	534	1,078
Total liabilities	538	1,083
American Airlines, Inc. | Retiree Medical and  Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liability	108	142
Noncurrent liability	1,032	1,037
Total liabilities	$ 1,140	$ 1,179