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Basis of Presentation and Summary of Significant Accounting Policies - Regional Expenses (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Regional Expenses [Line Items] |  |  |
Depreciation and amortization | $ 1,936 | $ 1,977 | $ 2,019
Aircraft rent | 1,369 | 1,395 | 1,425
Capacity purchases from third-party regional carriers | $ 4,643 | 4,385 | 3,204
Republic Holdings |  |  |
Regional Expenses [Line Items] |  |  |
Ownership Interest | 25.00% |  |
Regional Carrier |  |  |
Regional Expenses [Line Items] |  |  |
Depreciation and amortization | $ 318 | 321 | 316
Aircraft rent | 7 | 5 | 6
Regional Carrier | Republic Holdings |  |  |
Regional Expenses [Line Items] |  |  |
Capacity purchases from third-party regional carriers | 636 | 592 | 495
American Airlines, Inc. |  |  |
Regional Expenses [Line Items] |  |  |
Depreciation and amortization | 1,927 | 1,969 | 2,019
Aircraft rent | 1,369 | 1,395 | 1,425
Capacity purchases from third-party regional carriers | $ 4,619 | 4,345 | 3,111
American Airlines, Inc. | Republic Holdings |  |  |
Regional Expenses [Line Items] |  |  |
Ownership Interest | 25.00% |  |
American Airlines, Inc. | Regional Carrier |  |  |
Regional Expenses [Line Items] |  |  |
Depreciation and amortization | $ 271 | 269 | 263
Aircraft rent | 7 | 5 | 6
American Airlines, Inc. | Regional Carrier | Republic Holdings |  |  |
Regional Expenses [Line Items] |  |  |
Capacity purchases from third-party regional carriers | $ 636 | $ 592 | $ 495

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