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Termination of Merger Agreement with Spirit (Details) - USD ($)
1 Months Ended 12 Months Ended 29 Months Ended
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Mar. 05, 2024
Dec. 31, 2023
Jul. 28, 2022
Business Combination, Separately Recognized Transactions [Line Items]            
Valuation allowance   $ 238,000,000 $ 238,000,000   $ 153,000,000  
Goldman Sachs Bank USA, Bank of America, N.A. and BofA Securities, Inc | Senior Secured Bridge Facility | Bridge Facility            
Business Combination, Separately Recognized Transactions [Line Items]            
Principal amount           $ 3,500,000,000
Spirit            
Business Combination, Separately Recognized Transactions [Line Items]            
Reverse break-up 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 $ 123,000,000 $ 105,000,000 $ 105,000,000   $ 18,000,000