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Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Schedule of Carrying Amounts and Estimated Fair Value of Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Long-term debt $ 3,923 $ 4,003
Long term debt, fair value 3,485 3,982
Finance lease, liability 3 3
Fixed rate special facility bonds, due through 2036    
Debt Instrument [Line Items]    
Long-term debt 42 42
Long term debt, fair value 44 45
2019-1 Series AA, due through 2032    
Debt Instrument [Line Items]    
Long-term debt 532 532
Long term debt, fair value 398 442
2019-1 Series A, due through 2028    
Debt Instrument [Line Items]    
Long-term debt 166 166
Long term debt, fair value 141 150
2019-1 Series B, due through 2027    
Debt Instrument [Line Items]    
Long-term debt 95 94
Long term debt, fair value 113 121
2020-1 Series A, due through 2032    
Debt Instrument [Line Items]    
Long-term debt 587 587
Long term debt, fair value 566 634
2020-1 Series B, due through 2028    
Debt Instrument [Line Items]    
Long-term debt 153 153
Long term debt, fair value 183 199
Fixed rate enhanced equipment notes, due through 2023    
Debt Instrument [Line Items]    
Long-term debt 66 88
Long term debt, fair value 65 88
Fixed rate equipment notes, due through 2028    
Debt Instrument [Line Items]    
Long-term debt 575 620
Long term debt, fair value 519 706
Floating rate equipment notes, due through 2028    
Debt Instrument [Line Items]    
Long-term debt 89 103
Long term debt, fair value 83 99
2020 sale-leaseback transactions, due through 2024    
Debt Instrument [Line Items]    
Long-term debt 346 347
Long term debt, fair value 358 374
Unsecured CARES Act Payroll Support Program loan, due through 2030    
Debt Instrument [Line Items]    
Long-term debt 259 259
Long term debt, fair value 188 219
Unsecured Consolidated Appropriations Act Payroll Support Program Extension loan, due through 2031    
Debt Instrument [Line Items]    
Long-term debt 144 144
Long term debt, fair value 104 121
Unsecured American Rescue Plan Act of 2021 Payroll Support loan, due through 2031    
Debt Instrument [Line Items]    
Long-term debt 132 132
Long term debt, fair value $ 95 111
0.50% convertible senior notes due 2026    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 0.50%  
Long-term debt $ 737 736
Long term debt, fair value $ 628 $ 673