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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items] |  |  |
Asset held for sale | $ 33,000,000 |  |
Advertising expense | 79,000,000 | $ 66,000,000 | $ 59,000,000
Embraer E190 Fleet |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment losses | $ 0 | 0 | 52,000,000
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 | $ 138,000,000 | 157,000,000 |
Amortization expense | 72,000,000 | 62,000,000 | $ 51,000,000
High density airports, take-off and landing slots |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, net (excluding goodwill) | 139,000,000 | $ 139,000,000 |
JMP Holdings, LLC |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Restricted cash | $ 65,000,000 |  |
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/exampleRef -Topic 720 -SubTopic 35 -Name Accounting Standards Codification -Section 55 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483385/720-35-55-1 Reference 2: 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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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-1 + Details
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