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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 | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt | $ 8,164 | $ 4,716
Long term debt, fair value | 8,744 | 4,691
Finance lease, liability | 67 | 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 | 463 | 476
Long term debt, fair value | 464 | 474
2019-1 Series A, due through 2028 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 144 | 149
Long term debt, fair value | 146 | 150
2019-1 Series B, due through 2027 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 63 | 70
Long term debt, fair value | 76 | 86
2020-1 Series A, due through 2032 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 486 | 506
Long term debt, fair value | 575 | 597
2020-1 Series B, due through 2028 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 108 | 117
Long term debt, fair value | 136 | 150
Fixed rate equipment notes, due through 2028 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 239 | 322
Long term debt, fair value | 233 | 305
Floating rate equipment notes, due through 2036 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 434 | 109
Long term debt, fair value | 496 | 113
Aircraft sale-leaseback transactions, due through 2036 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 2,186 | 1,648
Long term debt, fair value | 2,455 | 1,738
TrueBlue® senior secured notes, due through 2031 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 1,954 | 0
Long term debt, fair value | 2,095 | 0
TrueBlue® senior secured term loan facility, due through 2029 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 737 | 0
Long term debt, fair value | 911 | 0
Unsecured CARES Act Payroll Support Program loan, due through 2030 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 259 | 259
Long term debt, fair value | 201 | 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 | 110 | 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 | 101 | 93
0.50% convertible senior notes due through 2026 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 323 | 742
Long term debt, fair value | $ 301 | 657
Debt instrument, interest rate, stated percentage (in percent) | 0.50% |
2.50% convertible senior notes, due through 2029 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 450 | 0
Long term debt, fair value | $ 401 | $ 0
Debt instrument, interest rate, stated percentage (in percent) | 2.50% |

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