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Employee Benefit Plans - Additional Information (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Jun. 14, 2019 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Mar. 29, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Weighted average expected rate of return on plan assets |  | 8.00% |  |  |
Defined benefit plan, assumptions used for expected long-term rate of return on plan assets, term |  | 10 years |  |  |
Estimated period of liquidation of underlying assets |  | 10 years |  |  |
Defined benefit plan master trust future funding commitments |  | $ 1,300 |  |  |
Defined benefit plan master trust future funding commitments, period |  | 5 years |  |  |
Contributions to defined contribution benefit plans |  | $ 1,100 | $ 949 | $ 920 |
Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Weighted average expected rate of return on plan assets |  | 8.00% | 8.00% | 8.00% |
Minimum required employer contributions, next fiscal year |  | $ 284 |  |  |
International Association of Machinists & Aerospace Workers (IAM) National Pension Fund | Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Contribution to multiemployer plan by employer, individually significant |  | $ 52 | $ 46 | $ 43 |
Contributions to multiemployer plan by company |  |  | $ 533 |  |
Contributions to multiemployer plan by company, percentage of total contributions to plan (more than) |  |  | 5.00% |  |
Multiemployer plan, funded status percentage (over) |  |  |  |  | 80.00%
Rehabilitation plan, percentage increase in company annual contributions | 2.50% |  |  |  |
American Airlines, Inc. |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Weighted average expected rate of return on plan assets |  | 8.00% |  |  |
Defined benefit plan, assumptions used for expected long-term rate of return on plan assets, term |  | 10 years |  |  |
Estimated period of liquidation of underlying assets |  | 10 years |  |  |
Defined benefit plan master trust future funding commitments |  | $ 1,300 |  |  |
Defined benefit plan master trust future funding commitments, period |  | 5 years |  |  |
Contributions to defined contribution benefit plans |  | $ 1,100 | $ 916 | $ 893 |
American Airlines, Inc. | Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Weighted average expected rate of return on plan assets |  | 8.00% | 8.00% | 8.00% |
Minimum required employer contributions, next fiscal year |  | $ 280 |  |  |
American Airlines, Inc. | International Association of Machinists & Aerospace Workers (IAM) National Pension Fund | Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Contribution to multiemployer plan by employer, individually significant |  | $ 52 | $ 46 | $ 43 |
Contributions to multiemployer plan by company |  |  | $ 533 |  |
Contributions to multiemployer plan by company, percentage of total contributions to plan (more than) |  |  | 5.00% |  |
Multiemployer plan, funded status percentage (over) |  |  |  |  | 80.00%
Rehabilitation plan, percentage increase in company annual contributions | 2.50% |  |  |  |

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