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Accumulated Other Comprehensive Loss - Reclassifications out of AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total reclassifications for the period, net of tax | $ 65 | $ 108
Prior service cost |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total reclassifications for the period, net of tax | 9 | 11
Actuarial loss |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total reclassifications for the period, net of tax | 56 | 97
American Airlines, Inc. |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total reclassifications for the period, net of tax | 65 | 108
American Airlines, Inc. | Prior service cost |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total reclassifications for the period, net of tax | 9 | 11
American Airlines, Inc. | Actuarial loss |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total reclassifications for the period, net of tax | $ 56 | $ 97

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