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Basis of Presentation and Summary of Significant Accounting Policies - Operating Property and Equipment (Detail) - USD ($) $ in Billions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Property, Plant and Equipment [Line Items] |  |  |
Depreciation | $ 2.3 | $ 2.3 | $ 2.3
Minimum | Aircraft, engines and related rotable parts |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Residual value percentage of equipment and properties | 5.00% |  |
Estimated useful life | 20 years |  |
Minimum | Buildings and improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 5 years |  |
Minimum | Furniture, fixtures and other equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 3 years |  |
Minimum | Capitalized software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 5 years |  |
Maximum | Aircraft, engines and related rotable parts |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Residual value percentage of equipment and properties | 10.00% |  |
Estimated useful life | 30 years |  |
Maximum | Buildings and improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 30 years |  |
Maximum | Furniture, fixtures and other equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 15 years |  |
Maximum | Capitalized software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 10 years |  |
American Airlines, Inc. |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation | $ 2.2 | $ 2.2 | $ 2.3
American Airlines, Inc. | Minimum | Aircraft, engines and related rotable parts |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Residual value percentage of equipment and properties | 5.00% |  |
Estimated useful life | 20 years |  |
American Airlines, Inc. | Minimum | Buildings and improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 5 years |  |
American Airlines, Inc. | Minimum | Furniture, fixtures and other equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 3 years |  |
American Airlines, Inc. | Minimum | Capitalized software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 5 years |  |
American Airlines, Inc. | Maximum | Aircraft, engines and related rotable parts |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Residual value percentage of equipment and properties | 10.00% |  |
Estimated useful life | 30 years |  |
American Airlines, Inc. | Maximum | Buildings and improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 30 years |  |
American Airlines, Inc. | Maximum | Furniture, fixtures and other equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 15 years |  |
American Airlines, Inc. | Maximum | Capitalized software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Estimated useful life | 10 years |  |

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- Definition Stated as a percentage, the estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose) divided by its [historical] capitalized cost. + References No definition available. + Details
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