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.