v3.24.0.1
Entry into Merger Agreement with Spirit (Details) - USD ($)
12 Months Ended 17 Months Ended
Jul. 28, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2023
May 16, 2022
Business Combination, Separately Recognized Transactions [Line Items]            
Common stock, par value (in dollars per share)   $ 0.01 $ 0.01   $ 0.01  
Payment for Spirit Airlines acquisition   $ 131,000,000 $ 297,000,000 $ 0    
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]            
Common stock, par value (in dollars per share) $ 0.0001         $ 0.0001
Acquisition price (in dollars per share) 33.50         $ 30.00
Business acquisition amount equal to extent paid (in dollars per share) 2.50          
Payment of ticking fee, per share (in dollars per share) $ 0.10          
Additional prepayment period 5 days          
Payment for Spirit Airlines acquisition   $ 131,000,000     $ 403,000,000  
Frontier transaction costs         $ 25,000,000  
Spirit | Minimum            
Business Combination, Separately Recognized Transactions [Line Items]            
Business acquisition amount equal to extent paid (in dollars per share) $ 1.15