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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 ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |
Present value of future minimum lease payment | $ 63 | $ 89
Finance leases | 4.60% | 4.75%
Total debt and capital lease obligations | $ 4,907 | $ 2,352
Less: Current maturities | (450) | (344)
Less: Debt acquisition cost | (44) | (18)
Long-term debt and finance lease obligations | 4,413 | 1,990
Fixed rate specialty bonds, due through 2036 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 43 | $ 43
Weighted average interest rate | 4.90% | 4.90%
2019-1 Series AA, due through 2032 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 567 | $ 589
Weighted average interest rate | 2.80% | 2.80%
2019-1 Series A, due through 2028 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 176 | $ 183
Weighted average interest rate | 3.00% | 3.00%
2019-1 Series B, due through 2027 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 109 | $ 0
Weighted average interest rate | 8.20% | 0.00%
2020-1 Series A, due through 2032 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 635 | $ 0
Weighted average interest rate | 4.10% | 0.00%
2020-1 Series B, due through 2028 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 172 | $ 0
Weighted average interest rate | 7.80% | 0.00%
Fixed rate enhanced equipment notes, due through 2023 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 115 | $ 134
Weighted average interest rate | 4.50% | 4.50%
Fixed rate equipment notes, due through 2028 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 895 | $ 1,113
Weighted average interest rate | 4.20% | 4.20%
Floating rate equipment notes, due through 2028 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 153 | $ 201
Weighted average interest rate | 2.60% | 4.30%
Floating rate term loan credit facility, due through 2024 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 712 | $ 0
Weighted average interest rate | 6.40% | 0.00%
Secured CARES Act Loan, due through 2025 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 106 | $ 0
Weighted average interest rate | 3.20% | 0.00%
Citibank line of credit, due through 2023 |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 550 | $ 0
Weighted average interest rate | 2.20% | 0.00%
2020 sale-leaseback transactions, due through 2024 |  |
Debt Instrument [Line Items] |  |
Secured debt |  | $ 0
Weighted average interest rate | 7.60% | 0.00%
Unsecured debt | $ 352 |
Unsecured CARES Act Payroll Support Program loan, due through 2030 |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 2.00% | 0.00%
Unsecured debt | $ 259 | $ 0

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