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The Proposed Merger with Spirit Airlines, Inc. ("Spirit") (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Business Acquisition [Line Items]        
Transaction and merger-related costs, net   $ 1 $ 10 $ 0
Spirit Airlines, Inc Merger        
Business Acquisition [Line Items]        
Merger-related expenses upon termination of agreement $ (25)      
Termination fee   $ 69    
Legal, Accounting and Other Fees | Spirit Airlines, Inc Merger        
Business Acquisition [Line Items]        
Transaction and merger-related costs, net $ 16      
Retention Bonus | Spirit Airlines, Inc Merger        
Business Acquisition [Line Items]        
Transaction and merger-related costs, net     $ 19