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Long-term Debt, Short-term Borrowings, and Finance Lease Obligations - Net of Debt Acquisition Costs (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Present value of future minimum lease payment $ 3 $ 63
Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 4,003 4,800
Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt, fair value 3,982 4,930
Fixed rate specialty bonds, due through 2036 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 42 42
Fixed rate specialty bonds, due through 2036 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt, fair value 45 45
2019-1 Series AA, due through 2032 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 532 560
2019-1 Series AA, due through 2032 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt, fair value 442 440
2019-1 Series A, due through 2028 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 166 174
2019-1 Series A, due through 2028 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt, fair value 150 152
2019-1 Series B, due through 2027 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 94 107
2019-1 Series B, due through 2027 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt, fair value 121 139
2020-1 Series A, due through 2032 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 587 627
2020-1 Series A, due through 2032 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt, fair value 634 658
2020-1 Series B, due through 2028 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 153 170
2020-1 Series B, due through 2028 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt, fair value 199 223
Fixed rate enhanced equipment notes, due through 2023 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 88 114
Fixed rate enhanced equipment notes, due through 2023 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt, fair value 88 116
Fixed rate equipment notes, due through 2028 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 620 891
Fixed rate equipment notes, due through 2028 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt, fair value 706 1,017
Floating rate equipment notes, due through 2028 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 103 152
Floating rate equipment notes, due through 2028 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt, fair value 99 144
Floating rate term loan credit facility, due through 2024 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 0 702
Floating rate term loan credit facility, due through 2024 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt, fair value 0 759
Unsecured CARES Act Payroll Support Program loan, due through 2030 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 259 259
Unsecured CARES Act Payroll Support Program loan, due through 2030 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt, fair value 219 207
Secured CARES Act loan, due through 2025 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 0 104
Secured CARES Act loan, due through 2025 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt, fair value 0 104
Citibank line of credit, due through 2023 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 0 546
Citibank line of credit, due through 2023 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt, fair value 0 533
2020 sale-leaseback transactions, due through 2024 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 347 352
2020 sale-leaseback transactions, due through 2024 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt, fair value 374 393
Unsecured Consolidated Appropriations Act Payroll Support Program Extension loan, due through 2031 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 144 0
Unsecured Consolidated Appropriations Act Payroll Support Program Extension loan, due through 2031 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt, fair value 121 0
Unsecured American Rescue Plan Act of 2021 Payroll Support loan, due through 2031 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 132 0
Unsecured American Rescue Plan Act of 2021 Payroll Support loan, due through 2031 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt, fair value 111 0
0.50% convertible senior notes, due through 2026    
Debt Instrument [Line Items]    
Long-term debt 750 0
0.50% convertible senior notes, due through 2026 | Carrying Value    
Debt Instrument [Line Items]    
Long-term debt 736 0
0.50% convertible senior notes, due through 2026 | Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt, fair value $ 673 $ 0