Basis of Presentation and Summary of Significant Accounting Policies - Significant Contract Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Contract balances, liability	$ 16,813	$ 15,527
Loyalty program liability
Disaggregation of Revenue [Line Items]
Contract balances, liability	10,054	9,327
Air traffic liability
Disaggregation of Revenue [Line Items]
Contract balances, liability	6,759	6,200
American Airlines, Inc.
Disaggregation of Revenue [Line Items]
Contract balances, liability	16,813	15,527
American Airlines, Inc. | Loyalty program liability
Disaggregation of Revenue [Line Items]
Contract balances, liability	10,054	9,327
American Airlines, Inc. | Air traffic liability
Disaggregation of Revenue [Line Items]
Contract balances, liability	$ 6,759	$ 6,200