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Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions | Oct. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
Cash and Cash Equivalents [Line Items] |  |  |  |  |
Cash and cash equivalents, held at project subsidiaries |  | $ 176 | $ 125 |  |
Cash and cash equivalents |  | 359 | 155 |  |
Restricted cash |  | 178 | 262 |  |
Cash, cash equivalents and restricted cash shown in the statement of cash flows |  | 537 | $ 417 | $ 397 | $ 583
Subsequent Event |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |
Cash distributions | $ 34 |  |  |  |
Long Term Debt Current |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |
Restricted cash |  | 46 |  |  |
Debt Service Obligations |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |
Restricted cash |  | 28 |  |  |
Cash Distribution |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |
Restricted cash |  | 30 |  |  |
Operating Funds |  |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |  |
Restricted cash |  | $ 74 |  |  |

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