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Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents, held at project subsidiaries	$ 135	$ 146
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	955	179
Restricted cash	333	475
Cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows	1,288	654	$ 470	$ 465
State of Hawaii | Prepayments and other current assets
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Refundable tax credit receivable	49	$ 49
Amount of restricted funds used to offset amounts under the PPAs	30
Long Term Debt Current
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Restricted cash	42
Debt Service Obligations
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Restricted cash	122
Cash Distribution
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Restricted cash	26
Operating Funds
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Restricted cash	$ 143

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