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Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Narrative (Details) - USD ($)
6 Months Ended
Oct. 21, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
May 16, 2022
Line of Credit Facility [Line Items]          
Reduction in outstanding debt and capital lease obligations   $ 200,000,000 $ 189,000,000    
Pledged assets not separately reported flight equipment   6,200,000,000      
Proceeds from sale leaseback transactions   228,000,000      
Morgan Stanley | Line of Credit          
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity   200,000,000      
Line of Credit | Morgan Stanley | Revolving Credit Facility and Letter of Credit Facility          
Line of Credit Facility [Line Items]          
Long-term line of credit   0   $ 0  
Equipment Notes 2030          
Line of Credit Facility [Line Items]          
Debt instrument, face amount   78,000,000      
Second Amended And Restated Agreement | Line of Credit | Citibank          
Line of Credit Facility [Line Items]          
Line of credit facility, maximum borrowing capacity $ 600,000,000        
Line of credit facility, current borrowing capacity 550,000,000        
Line pf credit facility, maximum borrowing capacity, increase limit $ 50,000,000        
Debt instrument, basis spread on variable rate (in percent) 1.00%        
Debt instrument, basis spread on variable rate, floor (in percent) 0.00%        
Long-term line of credit   $ 0   $ 0  
Second Amended And Restated Agreement | Line of Credit | Citibank | SOFR          
Line of Credit Facility [Line Items]          
Debt instrument, basis spread on variable rate (in percent) 2.00%        
Senior Secured Bridge Facility | Senior Notes          
Line of Credit Facility [Line Items]          
Debt instrument, face amount         $ 3,500,000,000
Senior Secured Bridge Facility | Bridge Facility | Goldman Sachs Bank USA, Bank of America, N.A. and BofA Securities, Inc | Spirit          
Line of Credit Facility [Line Items]          
Debt instrument, face amount         $ 3,500,000,000