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Long-term Debt, Short-term Borrowings and Finance Lease Obligations - Finance Lease Obligations And The Related Weighted Average Interest Rate (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Instrument [Line Items] |  |
Present value of future minimum lease payment | $ 0 | $ 2,000,000
Finance leases | 0.00% | 6.09%
Total debt and capital lease obligations | $ 4,740,000,000 | $ 3,676,000,000
Less: Debt acquisition cost | (24,000,000) | (29,000,000)
Less: Current maturities | (307,000,000) | (554,000,000)
Long-term debt and finance lease obligations | 4,409,000,000 | 3,093,000,000
Fixed rate specialty bonds, due through 2036 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 43,000,000 | $ 43,000,000
Weighted average interest rate | 5.00% | 4.90%
2019-1 Series AA, due through 2032 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 481,000,000 | $ 510,000,000
Weighted average interest rate | 2.80% | 2.80%
2019-1 Series A, due through 2028 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 150,000,000 | $ 159,000,000
Weighted average interest rate | 3.00% | 3.00%
2019-1 Series B, due through 2027 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 71,000,000 | $ 83,000,000
Weighted average interest rate | 8.10% | 8.10%
2020-1 Series A, due through 2032 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 511,000,000 | $ 552,000,000
Weighted average interest rate | 4.10% | 4.10%
2020-1 Series B, due through 2028 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 118,000,000 | $ 136,000,000
Weighted average interest rate | 7.80% | 7.80%
Fixed rate enhanced equipment notes, due through 2023 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 0 | $ 61,000,000
Weighted average interest rate | 0.00% | 4.40%
Fixed rate equipment notes, due through 2028 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 323,000,000 | $ 448,000,000
Weighted average interest rate | 4.30% | 4.20%
Floating rate equipment notes, due through 2030 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 109,000,000 | $ 56,000,000
Weighted average interest rate | 7.40% | 6.90%
Aircraft sale-leaseback transactions, due through 2035 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 1,649,000,000 | $ 341,000,000
Weighted average interest rate | 7.00% | 7.30%
Unsecured CARES Act Payroll Support Program loan, due through 2030 |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 2.00% | 2.00%
Unsecured debt | $ 259,000,000 | $ 259,000,000
Unsecured Consolidated Appropriations Act Payroll Support Program Extension loan, due through 2031 |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 2.00% | 2.00%
Unsecured debt | $ 144,000,000 | $ 144,000,000
Unsecured American Rescue Plan Act of 2021 Payroll Support loan, due through 2031 |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 2.00% | 2.00%
Unsecured debt | $ 132,000,000 | $ 132,000,000
0.50% convertible senior notes, due through 2026 |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 0.50% | 0.50%
Debt instrument, interest rate, stated percentage | 0.50% |
Long-term debt | $ 750,000,000 | $ 750,000,000

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