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The Proposed Merger with Spirit Airlines, Inc. (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Jul. 27, 2022
Business Acquisition [Line Items]          
Transaction and merger-related costs, net $ (12) $ 0 $ 8 $ 0  
Spirit Airlines, Inc Merger          
Business Acquisition [Line Items]          
Transaction and merger-related costs, net 13   33    
Merger-related expenses upon termination of agreement 25   25    
Termination fee         $ 69
Legal, Accounting and Other Fees | Spirit Airlines, Inc Merger          
Business Acquisition [Line Items]          
Transaction and merger-related costs, net 4   16    
Retention Bonus | Spirit Airlines, Inc Merger          
Business Acquisition [Line Items]          
Transaction and merger-related costs, net $ 9   $ 17    
Employee Retention Costs | Spirit Airlines, Inc Merger          
Business Acquisition [Line Items]          
Acceleration of merger retention costs 50.00%