Basis of Presentation and Summary of Significant Accounting Policies - Significant Contract Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Contract balances, liability	$ 15,890	$ 15,222
Loyalty program liability
Disaggregation of Revenue [Line Items]
Contract balances, liability	9,145	9,135
Air traffic liability
Disaggregation of Revenue [Line Items]
Contract balances, liability	6,745	6,087
American Airlines, Inc.
Disaggregation of Revenue [Line Items]
Contract balances, liability	15,890	15,222
American Airlines, Inc. | Loyalty program liability
Disaggregation of Revenue [Line Items]
Contract balances, liability	9,145	9,135
American Airlines, Inc. | Air traffic liability
Disaggregation of Revenue [Line Items]
Contract balances, liability	$ 6,745	$ 6,087