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Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Narrative (Details)
$ / shares in Units, shares in Millions
1 Months Ended 9 Months Ended
Oct. 21, 2022
USD ($)
Sep. 15, 2021
USD ($)
May 06, 2021
USD ($)
$ / shares
shares
Jan. 15, 2021
$ / shares
shares
Apr. 23, 2020
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
trading_day
Sep. 30, 2022
USD ($)
$ / shares
Sep. 30, 2021
USD ($)
Jul. 28, 2022
$ / shares
May 16, 2022
USD ($)
$ / shares
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
$ / shares
Sep. 29, 2020
USD ($)
$ / shares
shares
Line of Credit Facility [Line Items]                          
Repayment of long-term debt and finance lease obligations             $ 255,000,000 $ 1,775,000,000          
Pledged assets not separately reported flight equipment             $ 6,300,000,000            
Common stock, par value (in dollars per share) | $ / shares             $ 0.01         $ 0.01  
CARES act, payroll support program, total payment         $ 963,000,000                
CARES act, payroll support program, grant         $ 704,000,000                
Class of warrant or right, outstanding (in shares) | shares     0.7 1.0 2.7               1.2
Class of warrant or right, exercise price of warrants or rights (in dollars per share) | $ / shares     $ 19.90 $ 14.43 $ 9.50               $ 9.50
Warrants and rights outstanding, term                         5 years
CARES act, secured loans, eligibility amount             $ 1,900,000,000            
Repayments of debt   $ 118,000,000                      
Interest expense, debt             6,000,000 4,000,000          
Amortization of debt issuance costs             2,000,000 $ 2,000,000          
Spirit                          
Line of Credit Facility [Line Items]                          
Common stock, par value (in dollars per share) | $ / shares                 $ 0.0001 $ 0.0001      
Acquisition price (in dollars per share) | $ / shares                 $ 33.50 $ 30.00      
Payroll Support 2 Payments                          
Line of Credit Facility [Line Items]                          
CARES act, payroll support program, total payment             580,000,000            
CARES act, payroll support program, grant             436,000,000            
Payroll Support 3 Payments                          
Line of Credit Facility [Line Items]                          
CARES act, payroll support program, total payment     $ 541,000,000                    
CARES act, payroll support program, grant     $ 409,000,000                    
Morgan Stanley | Line of Credit                          
Line of Credit Facility [Line Items]                          
Line of credit facility, maximum borrowing capacity             200,000,000            
Morgan Stanley | Revolving Credit Facility and Letter of Credit Facility | Line of Credit                          
Line of Credit Facility [Line Items]                          
Long-term line of credit             0         $ 0  
Senior Secured Bridge Facility | Senior Notes                          
Line of Credit Facility [Line Items]                          
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 | Spirit                          
Line of Credit Facility [Line Items]                          
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      
Unsecured Debt | US Department of Treasury                          
Line of Credit Facility [Line Items]                          
Debt instrument, face amount         $ 259,000,000                
Debt instrument, basis spread on variable rate     1.00%   1.00%                
Debt instrument, interest rate, stated percentage       1.00%                  
Unsecured Debt | US Department of Treasury | Payroll Support 2 Payments                          
Line of Credit Facility [Line Items]                          
Debt instrument, face amount             $ 144,000,000            
Unsecured Debt | US Department of Treasury | Payroll Support 3 Payments                          
Line of Credit Facility [Line Items]                          
Debt instrument, face amount     $ 132,000,000                    
Unsecured Debt | US Department of Treasury | SOFR                          
Line of Credit Facility [Line Items]                          
Debt instrument, term     10 years 10 years 10 years                
Debt instrument, basis spread on variable rate     2.00% 2.00% 2.00%                
Non Public Debt Secured CARES Act Loan due through 2025 | US Department of Treasury | Long-term Debt                          
Line of Credit Facility [Line Items]                          
Debt instrument, face amount                         $ 115,000,000
Convertible Senior Notes Due 2026 | Senior Notes                          
Line of Credit Facility [Line Items]                          
Debt instrument, face amount                     $ 750,000,000    
Debt instrument, interest rate, stated percentage                     0.50%    
Proceeds from offering           $ 734,000,000              
Debt instrument, convertible, conversion ratio           0.0385802              
Debt instrument, convertible, conversion price (in dollars per share) | $ / shares             $ 25.92            
Convertible Senior Notes Due 2026 | Senior Notes | Debt Instrument, Redemption, Period One                          
Line of Credit Facility [Line Items]                          
Debt instrument, redemption price, percentage           100.00%              
Trading days | trading_day           20              
Convertible Senior Notes Due 2026 | Senior Notes | Debt Instrument, Redemption, Period Two                          
Line of Credit Facility [Line Items]                          
Debt instrument, redemption price, percentage           130.00%              
Trading days | trading_day           30              
Non Public Debt Citibank Line of Credit due through 2023 | Citibank | Line of Credit                          
Line of Credit Facility [Line Items]                          
Line of credit, current             $ 550,000,000            
Second Amended and Restated Agreement | Line of Credit | Subsequent Event                          
Line of Credit Facility [Line Items]                          
Debt instrument, basis spread on variable rate 1.00%                        
Increase in lending commitments $ 50,000,000                        
Line of credit facility, maximum borrowing capacity $ 600,000,000                        
Interest rate floor 0.00%                        
Second Amended and Restated Agreement | SOFR | Line of Credit | Subsequent Event                          
Line of Credit Facility [Line Items]                          
Debt instrument, basis spread on variable rate 2.00%