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Debt - Schedule of Debt Obligations (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Apr. 30, 2020
Mar. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]      
Long-term debt, gross   $ 429 $ 431
Less current maturities of long-term debt   (215) (157)
Less debt acquisition costs and other discounts, net   (2) (2)
Long-term debt, net   $ 212 272
CARES Act Credit Agreement, Warrants      
Debt Instrument [Line Items]      
Warrants to acquire common stock (in shares)   3,117,940  
Exercise price of warrants (in dollars per share)   $ 6.95  
Warrants exercised (in shares)   0  
Secured Debt | Pre-delivery credit facility      
Debt Instrument [Line Items]      
Long-term debt, gross   $ 266 277
Amount of unsecured borrowings available   $ 270  
Periodic payment, interest, period   90 days  
Secured Debt | Floating rate building note      
Debt Instrument [Line Items]      
Long-term debt, gross   $ 17 17
Unsecured Debt | PSP Promissory Note      
Debt Instrument [Line Items]      
Long-term debt, gross   $ 66 66
Interest rate   1.00%  
Interest rate period   5 years  
Unsecured Debt | PSP Promissory Note | Secured Overnight Financing Rate (SOFR)      
Debt Instrument [Line Items]      
Debt instrument, variable interest rate   2.00%  
Unsecured Debt | PSP1 Promissory Note      
Debt Instrument [Line Items]      
Loan term 10 years    
Unsecured Debt | Affinity card advance purchase of mileage credits      
Debt Instrument [Line Items]      
Long-term debt, gross   $ 80 $ 71
Amount of unsecured borrowings available   $ 200