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Long-Term Investments (Equity Method Investments) (Details) - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2021 | Dec. 31, 2020
Long-Term Investments [Line Items] |  |
Long-Term Investments | $ 541 | $ 536
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 | $ 111 |
Partnerships And Corporate Joint Ventures [Member] |  |
Long-Term Investments [Line Items] |  |
Long-Term Investments | 173 | 64
Partnerships And Corporate Joint Ventures [Member] | Kalaeloa [Member] |  |
Long-Term Investments [Line Items] |  |
Long-Term Investments | $ 62 | $ 64

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