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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, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |
Present value of future minimum lease payment | $ 0 | $ 2
Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 4,716 | 3,645
Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 4,691 | 2,848
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 | 43 | 43
2019-1 Series AA, due through 2032 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 476 | 504
2019-1 Series AA, due through 2032 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 474 | 345
2019-1 Series A, due through 2028 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 149 | 157
2019-1 Series A, due through 2028 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 150 | 124
2019-1 Series B, due through 2027 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 70 | 82
2019-1 Series B, due through 2027 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 86 | 87
2020-1 Series A, due through 2032 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 506 | 546
2020-1 Series A, due through 2032 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 597 | 457
2020-1 Series B, due through 2028 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 117 | 135
2020-1 Series B, due through 2028 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 150 | 142
Fixed rate enhanced equipment notes, due through 2023 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 0 | 61
Fixed rate enhanced equipment notes, due through 2023 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 0 | 60
Fixed rate equipment notes, due through 2028 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 322 | 447
Fixed rate equipment notes, due through 2028 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 305 | 422
Floating rate equipment notes, due through 2030 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 109 | 56
Floating rate equipment notes, due through 2030 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 113 | 49
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 | 184 | 126
Aircraft sale-leaseback transactions, due through 2035 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 1,648 | 341
Aircraft sale-leaseback transactions, due through 2035 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 1,738 | 329
Unsecured Consolidated Appropriations Act Payroll Support Program Extension loan, due through 2031 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 144 | 144
Unsecured Consolidated Appropriations Act Payroll Support Program Extension loan, due through 2031 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | 101 | 68
Unsecured American Rescue Plan Act of 2021 Payroll Support loan, due through 2031 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | 132 | 132
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 | 93 | 62
0.50% convertible senior notes, due through 2026 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 750 | 750
Debt instrument, interest rate, stated percentage | 0.50% |
0.50% convertible senior notes, due through 2026 | Carrying Value |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 742 | 739
0.50% convertible senior notes, due through 2026 | Estimated Fair Value |  |
Debt Instrument [Line Items] |  |
Long-term debt, fair value | $ 657 | $ 534

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