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Long-term Debt and Finance Leases - Recourse Debt (Details) - Revolving Credit Facility - Line of Credit - Credit agreement - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | May 06, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |
Increase revolving commitments | $ 802,000,000 |  |  |
Revolving credit commitments | $ 273,000,000 |  |  |
Debt term | 30 months |  |  |
Debt extension, term | 12 months |  |  |
Total revolving commitments available |  |  | $ 3,700,000,000 |
Subtotal long-term debt (including current maturities) |  |  | $ 750,000,000 | $ 0
Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Subtotal long-term debt (including current maturities) |  | $ 70,000,000 |  |

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