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Termination of Merger Agreement with Spirit (Details) - USD ($)	9 Months Ended	26 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Mar. 31, 2024	Mar. 05, 2024	Jul. 28, 2022
Goldman Sachs Bank USA, Bank of America, N.A. and BofA Securities, Inc | Bridge Facility | Senior Secured Bridge Facility
Business Combination, Separately Recognized Transactions [Line Items]
Debt instrument, face amount					$ 3,500,000,000
Spirit
Business Combination, Separately Recognized Transactions [Line Items]
Termination fee				$ 69,000,000
Payment of ticking fee, per share (in dollars per share)					$ 0.10
Payment for Spirit Airlines acquisition	$ 22,000,000	$ 425,000,000
Frontier transaction costs		$ 25,000,000
Valuation allowance			$ 134,000,000

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