Basis of Presentation and Summary of Significant Accounting Policies - Significant Contract Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Contract balances, liability	$ 15,222	$ 13,952
Loyalty program liability
Disaggregation of Revenue [Line Items]
Contract balances, liability	9,135	9,195
Air traffic liability
Disaggregation of Revenue [Line Items]
Contract balances, liability	6,087	4,757
American Airlines, Inc.
Disaggregation of Revenue [Line Items]
Contract balances, liability	15,222	13,952
American Airlines, Inc. | Loyalty program liability
Disaggregation of Revenue [Line Items]
Contract balances, liability	9,135	9,195
American Airlines, Inc. | Air traffic liability
Disaggregation of Revenue [Line Items]
Contract balances, liability	$ 6,087	$ 4,757