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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items] |  |  |
Advertising expense | $ 66 | $ 59 | $ 45
Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Term of contract under loyalty program | 1 year |  |
Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Term of contract under loyalty program | 10 years |  |
Computer software, intangible asset |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life of software | 5 years |  |
Capitalized computer software, net | $ 157 | 123 |
Amortization expense | 62 | 51 | $ 45
High density airports, take-off and landing slots |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, net (excluding goodwill) | 139 | $ 139 |
JMP Holdings, LLC |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Restricted cash | $ 65 |  |
Ownership percentage, noncontrolling interest | 5.00% |  |
TWA Flight Center Hotel |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Ownership percentage, noncontrolling interest | 10.00% |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 720 -SubTopic 35 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483406/720-35-50-1 + Details
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