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Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2024
USD ($)
$ / shares
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Aug. 16, 2024
USD ($)
Mar. 02, 2024
USD ($)
Dec. 31, 2023
USD ($)
Oct. 21, 2022
USD ($)
Jul. 28, 2022
USD ($)
Line of Credit Facility [Line Items]                    
Reduction in outstanding debt and capital lease obligations       $ 631,000,000 $ 254,000,000          
Pledged assets not separately reported flight equipment   $ 6,900,000,000   6,900,000,000            
Gain on debt extinguishments   22,000,000 $ 0 22,000,000 0          
Long-term debt   8,164,000,000   8,164,000,000       $ 4,716,000,000    
Proceeds from sale-leaseback transactions       607,000,000 $ 523,000,000          
Morgan Stanley | Line of Credit                    
Line of Credit Facility [Line Items]                    
Line of credit facility, maximum borrowing capacity   200,000,000   200,000,000            
Short-term debt   0   0       0    
2024 Floating Rate Equipment Notes                    
Line of Credit Facility [Line Items]                    
Debt instrument, face amount   350,000,000   350,000,000            
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  
Long-term line of credit   $ 0   $ 0       0    
Senior Secured Bridge Facility | Senior Notes                    
Line of Credit Facility [Line Items]                    
Debt instrument, face amount                   $ 3,500,000,000
Long-term line of credit             $ 0      
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
0.50% convertible senior notes due through 2026                    
Line of Credit Facility [Line Items]                    
Debt instrument, interest rate, stated percentage (in percent)   0.50%   0.50%            
Long-term debt   $ 323,000,000   $ 323,000,000       742,000,000    
0.50% convertible senior notes due through 2026 | Convertible Debt                    
Line of Credit Facility [Line Items]                    
Extinguishment of debt $ 425,000,000                  
Debt instrument, interest rate, stated percentage (in percent) 0.50%                  
Gain on debt extinguishments   22,000,000                
TrueBlue® senior secured notes, due through 2031                    
Line of Credit Facility [Line Items]                    
Long-term debt   1,954,000,000   1,954,000,000       0    
TrueBlue® senior secured notes, due through 2031 | Senior Notes                    
Line of Credit Facility [Line Items]                    
Debt instrument, interest rate, stated percentage (in percent) 9.875%                  
Debt instrument, face amount $ 2,000,000,000                  
Debt instrument, redemption price, percentage (in percent) 100.00%                  
TrueBlue® senior secured term loan facility, due through 2029                    
Line of Credit Facility [Line Items]                    
Long-term debt   $ 737,000,000   $ 737,000,000       0    
TrueBlue® senior secured term loan facility, due through 2029 | Line of Credit                    
Line of Credit Facility [Line Items]                    
Line of credit facility, maximum borrowing capacity $ 765,000,000                  
2.50% convertible senior notes, due through 2029                    
Line of Credit Facility [Line Items]                    
Debt instrument, interest rate, stated percentage (in percent)   2.50%   2.50%            
Long-term debt   $ 450,000,000   $ 450,000,000       $ 0    
2.50% convertible senior notes, due through 2029 | Convertible Debt                    
Line of Credit Facility [Line Items]                    
Debt instrument, interest rate, stated percentage (in percent) 2.50%                  
Debt instrument, face amount $ 460,000,000         $ 400,000,000        
Debt instrument, convertible, conversion ratio 0.1633987                  
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares $ 6.12                  
Debt instrument, redemption price, percentage (in percent) 100.00%                  
Debt issuance costs, net $ 10,000,000                  
Net proceeds $ 450,000,000                  
Debt Instrument, Interest Rate, Effective Percentage   2.60%   2.60%            
Interest expense, debt       $ 1,700,000            
Amortization of debt issuance costs       300,000            
Contractual interest expense       $ 1,400,000            
2.50% convertible notes, due through 2029, additional option | Convertible Debt                    
Line of Credit Facility [Line Items]                    
Debt instrument, face amount           $ 60,000,000