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Transactions with Related Parties - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Related Party Transaction [Line Items] |  |  |
Capacity purchases from third-party regional carriers | $ 4,643 | $ 4,385 | $ 3,204
American Airlines, Inc. |  |  |
Related Party Transaction [Line Items] |  |  |
Capacity purchases from third-party regional carriers | 4,619 | 4,345 | 3,111
American Airlines, Inc. | Regional Carrier | AAG's Wholly-owned Subsidiaries | Airline Capacity Purchase Arrangements |  |  |
Related Party Transaction [Line Items] |  |  |
Capacity purchases from third-party regional carriers | $ 2,700 | $ 2,500 | $ 2,100

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