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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
Sep. 30, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Long-term debt $ 3,757 $ 4,003
Long term debt, fair value 2,884 3,982
Finance lease, liability 2 3
Fixed rate special facility bonds, due through 2036    
Debt Instrument [Line Items]    
Long-term debt 42 42
Long term debt, fair value 41 45
2019-1 Series AA, due through 2032    
Debt Instrument [Line Items]    
Long-term debt 519 532
Long term debt, fair value 342 442
2019-1 Series A, due through 2028    
Debt Instrument [Line Items]    
Long-term debt 162 166
Long term debt, fair value 125 150
2019-1 Series B, due through 2027    
Debt Instrument [Line Items]    
Long-term debt 88 94
Long term debt, fair value 94 121
2020-1 Series A, due through 2032    
Debt Instrument [Line Items]    
Long-term debt 567 587
Long term debt, fair value 467 634
2020-1 Series B, due through 2028    
Debt Instrument [Line Items]    
Long-term debt 144 153
Long term debt, fair value 151 199
Fixed rate enhanced equipment notes, due through 2023    
Debt Instrument [Line Items]    
Long-term debt 60 88
Long term debt, fair value 59 88
Fixed rate equipment notes, due through 2028    
Debt Instrument [Line Items]    
Long-term debt 495 620
Long term debt, fair value 400 706
Floating rate equipment notes, due through 2028    
Debt Instrument [Line Items]    
Long-term debt 64 103
Long term debt, fair value 56 99
Sale-leaseback transactions, due through 2024    
Debt Instrument [Line Items]    
Long-term debt 343 347
Long term debt, fair value 332 374
Unsecured CARES Act Payroll Support Program loan, due through 2030    
Debt Instrument [Line Items]    
Long-term debt 259 259
Long term debt, fair value 134 219
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 73 121
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 $ 67 111
0.50% convertible senior notes due 2026    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 0.50%  
Long-term debt $ 738 736
Long term debt, fair value $ 543 $ 673