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Employee Benefit Plans - Schedule of Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Noncurrent liability | $ 3,044 | $ 2,837
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Current liability | 5 | 4
Noncurrent liability | 1,974 | 2,149
Total liabilities | 1,979 | 2,153
Retiree Medical and Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Current liability | 122 | 85
Noncurrent liability | 1,070 | 688
Total liabilities | 1,192 | 773
American Airlines, Inc. |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Noncurrent liability | 3,020 | 2,811
American Airlines, Inc. | Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Current liability | 6 | 4
Noncurrent liability | 1,950 | 2,123
Total liabilities | 1,956 | 2,127
American Airlines, Inc. | Retiree Medical and Other Postretirement Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Current liability | 122 | 85
Noncurrent liability | 1,070 | 688
Total liabilities | $ 1,192 | $ 773

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