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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, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt | $ 5,026 | $ 4,800
Long term debt, fair value | 4,983 | 4,930
Finance lease, liability | 56 | 63
Fixed rate special facility bonds, due through 2036 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 42 | 42
Long term debt, fair value | 46 | 45
2019-1 Series AA, due through 2032 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 560 | 560
Long term debt, fair value | 456 | 440
2019-1 Series A, due through 2028 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 175 | 174
Long term debt, fair value | 155 | 152
2019-1 Series B, due through 2027 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 107 | 107
Long term debt, fair value | 140 | 139
2020-1 Series A, due through 2032 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 627 | 627
Long term debt, fair value | 676 | 658
2020-1 Series B, due through 2028 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 170 | 170
Long term debt, fair value | 226 | 223
Fixed rate enhanced equipment notes, due through 2023 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 100 | 114
Long term debt, fair value | 101 | 116
Fixed rate equipment notes, due through 2028 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 841 | 891
Long term debt, fair value | 829 | 1,017
Floating rate equipment notes, due through 2028 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 140 | 152
Long term debt, fair value | 133 | 144
Floating rate term loan credit facility, due through 2024 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 695 | 702
Long term debt, fair value | 754 | 759
Unsecured CARES Act Payroll Support Program loan, due through 2030 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 259 | 259
Long term debt, fair value | 214 | 207
Secured CARES Act Loan, due through 2025 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 104 | 104
Long term debt, fair value | 106 | 104
Citibank line of credit, due through 2023 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 0 | 546
Long term debt, fair value | 0 | 533
2020 sale-leaseback transactions, due through 2024 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 351 | 352
Long term debt, fair value | 388 | 393
Unsecured Consolidated Appropriations Act Payroll Support Program Extension loan, due through 2031 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 121 | 0
Long term debt, fair value | $ 100 | 0
0.50% convertible senior notes due 2026 |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, stated percentage | 0.50% |
Long-term debt | $ 734 | 0
Long term debt, fair value | $ 659 | $ 0

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