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Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Narrative (Details)
1 Months Ended 3 Months Ended
Sep. 15, 2021
USD ($)
May 06, 2021
USD ($)
$ / shares
shares
Jan. 15, 2021
USD ($)
$ / shares
shares
Apr. 23, 2020
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
trading_day
day
Mar. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
Sep. 29, 2020
USD ($)
$ / shares
shares
Line of Credit Facility [Line Items]                
Reduction in outstanding debt and capital lease obligations           $ 83,000,000    
Pledged assets not separately reported flight equipment           5,600,000,000    
CARES act, payroll support program, total payment   $ 541,000,000 $ 580,000,000 $ 963,000,000        
CARES act, payroll support program, grant   $ 409,000,000 $ 436,000,000 $ 704,000,000        
Class of warrant or right, outstanding (in shares) | shares   700,000 1,000,000 2,700,000       1,200,000
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           2,000,000    
Amortization of debt issuance costs           1,000,000    
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    
Trading days | trading_day         20      
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%      
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 | day         30      
0.50% convertible senior notes due 2026                
Line of Credit Facility [Line Items]                
Debt instrument, interest rate, stated percentage           0.50%    
US Department of Treasury | Unsecured Debt                
Line of Credit Facility [Line Items]                
Debt instrument, face amount   $ 132,000,000 $ 144,000,000 $ 259,000,000        
Debt instrument, interest rate, stated percentage   1.00% 1.00% 1.00%        
US Department of Treasury | Unsecured Debt | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate                
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%        
US Department of Treasury | Non Public Debt Secured CARES Act Loan due through 2025 | Long-term Debt                
Line of Credit Facility [Line Items]                
Debt instrument, face amount               $ 115,000,000
Citibank | Non Public Debt Citibank Line of Credit due through 2023 | Line of Credit                
Line of Credit Facility [Line Items]                
Line of credit, current           $ 550,000,000    
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