Long-Term Investments (Equity Method Investments) (Details) - USD ($) $ in Millions	12 Months Ended
	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