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Termination of Merger Agreement with Spirit (Details) - USD ($)	3 Months Ended	20 Months Ended
	Mar. 31, 2024	Mar. 31, 2024	Mar. 05, 2024	Jul. 28, 2022	May 16, 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
Valuation allowance	$ 134,000,000	$ 134,000,000
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

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