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Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Finance Lease Obligations And The Related Weighted Average Interest Rate (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Present value of future minimum lease payment $ 2 $ 3
Finance leases 6.09% 6.09%
Total debt and capital lease obligations $ 3,676 $ 4,042
Less: Debt acquisition cost (29) (36)
Less: Current maturities (554) (355)
Long-term debt and finance lease obligations 3,093 3,651
Fixed rate specialty bonds, due through 2036    
Debt Instrument [Line Items]    
Secured debt $ 43 $ 43
Weighted average interest rate 4.90% 4.90%
2019-1 Series AA, due through 2032    
Debt Instrument [Line Items]    
Secured debt $ 510 $ 538
Weighted average interest rate 2.80% 2.80%
2019-1 Series A, due through 2028    
Debt Instrument [Line Items]    
Secured debt $ 159 $ 168
Weighted average interest rate 3.00% 3.00%
2019-1 Series B, due through 2027    
Debt Instrument [Line Items]    
Secured debt $ 83 $ 96
Weighted average interest rate 8.10% 8.20%
2020-1 Series A, due through 2032    
Debt Instrument [Line Items]    
Secured debt $ 552 $ 594
Weighted average interest rate 4.10% 4.10%
2020-1 Series B, due through 2028    
Debt Instrument [Line Items]    
Secured debt $ 136 $ 155
Weighted average interest rate 7.80% 7.80%
Fixed rate enhanced equipment notes, due through 2023    
Debt Instrument [Line Items]    
Secured debt $ 61 $ 88
Weighted average interest rate 4.40% 4.50%
Fixed rate equipment notes, due through 2028    
Debt Instrument [Line Items]    
Secured debt $ 448 $ 622
Weighted average interest rate 4.20% 4.20%
Floating rate equipment notes, due through 2028    
Debt Instrument [Line Items]    
Secured debt $ 56 $ 103
Weighted average interest rate 6.90% 2.70%
2020 sale-leaseback transactions, due through 2024    
Debt Instrument [Line Items]    
Secured debt $ 341 $ 347
Weighted average interest rate 7.30% 7.40%
Unsecured CARES Act Payroll Support Program loan, due through 2030    
Debt Instrument [Line Items]    
Weighted average interest rate 2.00% 2.00%
Unsecured debt $ 259 $ 259
Unsecured Consolidated Appropriations Act Payroll Support Program Extension loan, due through 2031    
Debt Instrument [Line Items]    
Weighted average interest rate 2.00% 2.00%
Unsecured debt $ 144 $ 144
Unsecured American Rescue Plan Act of 2021 Payroll Support loan, due through 2031    
Debt Instrument [Line Items]    
Weighted average interest rate 2.00% 2.00%
Unsecured debt $ 132 $ 132
0.50% convertible senior notes, due through 2026    
Debt Instrument [Line Items]    
Weighted average interest rate 0.50% 0.50%
Debt instrument, interest rate, stated percentage 0.50%  
Long-term debt $ 750 $ 750