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The Proposed Merger with Spirit Airlines, Inc. ("Spirit") (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Business Acquisition [Line Items]        
Transaction and merger-related costs $ 0 $ 9 $ 1 $ 20
Spirit Airlines, Inc Merger        
Business Acquisition [Line Items]        
Transaction and merger-related costs 1 9 1 20
Termination fee $ 69   $ 69  
Spirit Airlines, Inc Merger | Retention Bonus        
Business Acquisition [Line Items]        
Transaction and merger-related costs   5   8
Spirit Airlines, Inc Merger | Legal, Accounting and Other Fees        
Business Acquisition [Line Items]        
Transaction and merger-related costs   $ 4   $ 12