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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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