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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, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt | $ 4,992 | $ 4,716
Long term debt, fair value | 5,085 | 4,691
Finance lease, liability | 20 | 0
Fixed rate special facility bonds, due through 2036 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 42 | 42
Long term debt, fair value | 43 | 43
2019-1 Series AA, due through 2032 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 477 | 476
Long term debt, fair value | 483 | 474
2019-1 Series A, due through 2028 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 149 | 149
Long term debt, fair value | 151 | 150
2019-1 Series B, due through 2027 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 70 | 70
Long term debt, fair value | 86 | 86
2020-1 Series A, due through 2032 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 506 | 506
Long term debt, fair value | 606 | 597
2020-1 Series B, due through 2028 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 117 | 117
Long term debt, fair value | 150 | 150
Fixed rate equipment notes, due through 2028 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 290 | 322
Long term debt, fair value | 278 | 305
Floating rate equipment notes, due through 2030 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 101 | 109
Long term debt, fair value | 106 | 113
Aircraft sale-leaseback transactions, due through 2036 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 1,962 | 1,648
Long term debt, fair value | 2,121 | 1,738
Unsecured CARES Act Payroll Support Program loan, due through 2030 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 259 | 259
Long term debt, fair value | 190 | 184
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 | 104 | 101
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 | 96 | 93
Non Public Convertible Senior Notes Due 2026 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | 743 | 742
Long term debt, fair value | $ 671 | $ 657
Debt instrument, interest rate, stated percentage (in percent) | 0.50% |

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