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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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