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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 6 Months Ended
Sep. 15, 2021
USD ($)
Jun. 17, 2021
USD ($)
May 06, 2021
USD ($)
$ / shares
shares
Jan. 15, 2021
$ / shares
shares
Jun. 17, 2020
USD ($)
Apr. 23, 2020
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
trading_day
Jun. 30, 2022
USD ($)
$ / shares
Jun. 30, 2021
USD ($)
May 16, 2022
USD ($)
$ / 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               $ 189,000,000 $ 1,481,000,000        
Pledged assets not separately reported flight equipment               $ 6,500,000,000          
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
CARES act, secured loans, eligibility amount               $ 1,900,000,000          
Warrants and rights outstanding, term                         5 years
Repayments of debt $ 118,000,000                        
Line of credit, current               0          
Interest expense, debt               4,000,000 2,000,000        
Amortization of debt issuance costs               2,000,000 1,000,000        
Spirit                          
Line of Credit Facility [Line Items]                          
Common stock, par value (in dollars per share) | $ / shares                   $ 0.0001      
Acquisition price (in dollars per share) | $ / shares                   $ 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%              
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 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
Non Public Debt Floating Rate Term Loan Credit Facility | Line of Credit                          
Line of Credit Facility [Line Items]                          
Repayments of debt   $ 722,000,000                      
Debt extinguishment expenses                 $ 40,000,000        
Non Public Debt Floating Rate Term Loan Credit Facility | Barclays Bank PLC | Line of Credit                          
Line of Credit Facility [Line Items]                          
Debt instrument, face amount         $ 750,000,000                
Non Public Debt Floating Rate Term Loan Credit Facility | Barclays Bank PLC | Line of Credit | LIBOR                          
Line of Credit Facility [Line Items]                          
Debt instrument, basis spread on variable rate         1.00%                
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