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Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Narrative (Details) - USD ($)
3 Months Ended
Oct. 21, 2022
Mar. 31, 2024
Mar. 31, 2023
Mar. 02, 2024
Dec. 31, 2023
May 16, 2022
Line of Credit Facility [Line Items]            
Reduction in outstanding debt and capital lease obligations   $ 58,000,000 $ 109,000,000      
Pledged assets not separately reported flight equipment   6,400,000,000        
Finance lease, liability   20,000,000     $ 0  
Proceeds from sale-leaseback transactions   332,000,000 $ 38,000,000      
Morgan Stanley | Line of Credit            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity   200,000,000        
Short-term debt   0     0  
Second Amended And Restated Agreement | Citibank | Line of Credit            
Line of Credit Facility [Line Items]            
Line of credit facility, maximum borrowing capacity $ 600,000,000          
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 | Citibank | Line of Credit | 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]            
Long-term line of credit       $ 0    
Debt instrument, face amount           $ 3,500,000,000
Senior Secured Bridge Facility | Goldman Sachs Bank USA, Bank of America, N.A. and BofA Securities, Inc | Bridge Facility | Spirit            
Line of Credit Facility [Line Items]            
Debt instrument, face amount           $ 3,500,000,000