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Basis of Presentation and Summary of Significant Accounting Policies - Definite-Lived Intangible Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated amortization | $ (834) | $ (827)
Total | 108 | 115
Domestic airport slots |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | 365 | 365
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | 300 | 300
Marketing agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | $ 105 | 105
Useful life of intangible assets | 30 years |
Tradenames |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | $ 35 | 35
Airport gate leasehold rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | $ 137 | 137
Domestic airport slots and airport gate leasehold rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful life of intangible assets | 25 years |
American Airlines, Inc. |  |
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated amortization | $ (834) | (827)
Total | 108 | 115
American Airlines, Inc. | Domestic airport slots |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | 365 | 365
American Airlines, Inc. | Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | 300 | 300
American Airlines, Inc. | Marketing agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | $ 105 | 105
Useful life of intangible assets | 30 years |
American Airlines, Inc. | Tradenames |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | $ 35 | 35
American Airlines, Inc. | Airport gate leasehold rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Amortizable intangible assets, gross | $ 137 | $ 137
American Airlines, Inc. | Domestic airport slots and airport gate leasehold rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful life of intangible assets | 25 years |

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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