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Employee Benefit Plans - Schedule of Fair Value of Pension Plan Assets by Asset Category (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 84 | $ 75 | $ 58
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 12,431 | 11,884 | 14,691
Pension Benefits | Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 12,431 | 11,884 |
Pension Benefits | Recurring | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,436 | 3,398 |
Pension Benefits | Recurring | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,586 | 3,195 |
Pension Benefits | Recurring | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 84 | 75 |
Pension Benefits | Recurring | Equity | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,182 | 3,097 |
Pension Benefits | Recurring | Equity | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,182 | 3,097 |
Pension Benefits | Recurring | Equity | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Recurring | Equity | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Recurring | Fixed Income | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,498 | 3,144 |
Pension Benefits | Recurring | Fixed Income | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 260 | 227 |
Pension Benefits | Recurring | Fixed Income | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,238 | 2,917 |
Pension Benefits | Recurring | Fixed Income | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
Pension Benefits | Recurring | Other | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 426 | 427 |
Pension Benefits | Recurring | Other | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | (6) | 74 |
Pension Benefits | Recurring | Other | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 348 | 278 |
Pension Benefits | Recurring | Other | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 84 | 75 |
Pension Benefits | Recurring | Common/collective trusts | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,244 | 1,694 |
Pension Benefits | Recurring | Private Equity | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 4,081 | 3,522 |
American Airlines, Inc. | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 84 | 75 | 58
American Airlines, Inc. | Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 12,358 | 11,821 | $ 14,605
American Airlines, Inc. | Pension Benefits | Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 12,358 | 11,821 |
American Airlines, Inc. | Pension Benefits | Recurring | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,363 | 3,335 |
American Airlines, Inc. | Pension Benefits | Recurring | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,586 | 3,195 |
American Airlines, Inc. | Pension Benefits | Recurring | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 84 | 75 |
American Airlines, Inc. | Pension Benefits | Recurring | Equity | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,134 | 3,055 |
American Airlines, Inc. | Pension Benefits | Recurring | Equity | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,134 | 3,055 |
American Airlines, Inc. | Pension Benefits | Recurring | Equity | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
American Airlines, Inc. | Pension Benefits | Recurring | Equity | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
American Airlines, Inc. | Pension Benefits | Recurring | Fixed Income | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,473 | 3,123 |
American Airlines, Inc. | Pension Benefits | Recurring | Fixed Income | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 235 | 206 |
American Airlines, Inc. | Pension Benefits | Recurring | Fixed Income | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3,238 | 2,917 |
American Airlines, Inc. | Pension Benefits | Recurring | Fixed Income | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0 | 0 |
American Airlines, Inc. | Pension Benefits | Recurring | Other | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 426 | 427 |
American Airlines, Inc. | Pension Benefits | Recurring | Other | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | (6) | 74 |
American Airlines, Inc. | Pension Benefits | Recurring | Other | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 348 | 278 |
American Airlines, Inc. | Pension Benefits | Recurring | Other | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 84 | 75 |
American Airlines, Inc. | Pension Benefits | Recurring | Common/collective trusts | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1,244 | 1,694 |
American Airlines, Inc. | Pension Benefits | Recurring | Private Equity | Fair Value Measured at Net Asset Value Per Share |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 4,081 | $ 3,522 |

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