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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, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Present value of future minimum lease payment $ 3 $ 63
Finance leases 6.09% 4.60%
Total debt and capital lease obligations $ 4,042 $ 4,907
Less: Current maturities (355) (450)
Less: Debt acquisition cost (36) (44)
Long-term debt and finance lease obligations 3,651 4,413
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 $ 538 $ 567
Weighted average interest rate 2.80% 2.80%
2019-1 Series A, due through 2028    
Debt Instrument [Line Items]    
Secured debt $ 168 $ 176
Weighted average interest rate 3.00% 3.00%
2019-1 Series B, due through 2027    
Debt Instrument [Line Items]    
Secured debt $ 96 $ 109
Weighted average interest rate 8.20% 8.20%
2020-1 Series A, due through 2032    
Debt Instrument [Line Items]    
Secured debt $ 594 $ 635
Weighted average interest rate 4.10% 4.10%
2020-1 Series B, due through 2028    
Debt Instrument [Line Items]    
Secured debt $ 155 $ 172
Weighted average interest rate 7.80% 7.80%
Fixed rate enhanced equipment notes, due through 2023    
Debt Instrument [Line Items]    
Secured debt $ 88 $ 115
Weighted average interest rate 4.50% 4.50%
Fixed rate equipment notes, due through 2028    
Debt Instrument [Line Items]    
Secured debt $ 622 $ 895
Weighted average interest rate 4.20% 4.20%
Floating rate equipment notes, due through 2028    
Debt Instrument [Line Items]    
Secured debt $ 103 $ 153
Weighted average interest rate 2.70% 2.60%
Floating rate term loan credit facility, due through 2024    
Debt Instrument [Line Items]    
Secured debt $ 0 $ 712
Weighted average interest rate 0.00% 6.40%
Secured CARES Act loan, due through 2025    
Debt Instrument [Line Items]    
Secured debt $ 0 $ 106
Weighted average interest rate 0.00% 3.20%
Citibank line of credit, due through 2023    
Debt Instrument [Line Items]    
Secured debt $ 0 $ 550
Weighted average interest rate 0.00% 2.20%
2020 sale-leaseback transactions, due through 2024    
Debt Instrument [Line Items]    
Secured debt $ 347 $ 352
Weighted average interest rate 7.40% 7.60%
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% 0.00%
Unsecured debt $ 144 $ 0
Unsecured American Rescue Plan Act of 2021 Payroll Support loan, due through 2031    
Debt Instrument [Line Items]    
Weighted average interest rate 2.00% 0.00%
Unsecured debt $ 132 $ 0
0.50% convertible senior notes, due through 2026    
Debt Instrument [Line Items]    
Weighted average interest rate 0.50% 0.00%
Debt instrument, interest rate, stated percentage 0.50%  
Long-term debt $ 750 $ 0