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Long-Term Investments (Equity Method Investments) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Long-Term Investments [Line Items] |  |  |
Long-Term Investments |  | $ 624 | $ 541
Kalaeloa [Member] |  |  |
Long-Term Investments [Line Items] |  |  |
Owned percentage |  | 50.00% |
Ocean Wind JV Holdco |  |  |
Long-Term Investments [Line Items] |  |  |
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount |  | $ 225 | 111
Partnerships And Corporate Joint Ventures [Member] |  |  |
Long-Term Investments [Line Items] |  |  |
Long-Term Investments | [1] | 306 | 173
Partnerships And Corporate Joint Ventures [Member] | Kalaeloa [Member] |  |  |
Long-Term Investments [Line Items] |  |  |
Long-Term Investments |  | 71 | $ 62
Partnerships And Corporate Joint Ventures [Member] | Energy Impact Partners |  |  |
Long-Term Investments [Line Items] |  |  |
Long-Term Investments |  | $ 10 |
[1] | During the three years ended December 31, 2022, 2021 and 2020, dividends from these investments were $8 million, $17 million and $15 million, respectively.

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