Basis of Presentation and Summary of Significant Accounting Policies - Significant Contract Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Contract balances, liability	$ 15,527	$ 15,890
Loyalty program liability
Disaggregation of Revenue [Line Items]
Contract balances, liability	9,327	9,145
Air traffic liability
Disaggregation of Revenue [Line Items]
Contract balances, liability	6,200	6,745
American Airlines, Inc.
Disaggregation of Revenue [Line Items]
Contract balances, liability	15,527	15,890
American Airlines, Inc. | Loyalty program liability
Disaggregation of Revenue [Line Items]
Contract balances, liability	9,327	9,145
American Airlines, Inc. | Air traffic liability
Disaggregation of Revenue [Line Items]
Contract balances, liability	$ 6,200	$ 6,745