Long-Term Investments (Equity Method Investments) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Long-Term Investments [Line Items]
Long-Term Investments		$ 536	$ 812
Kalaeloa [Member]
Long-Term Investments [Line Items]
Owned percentage		50.00%
PSEG Power LLC
Long-Term Investments [Line Items]
Long-Term Investments		$ 64	66
Partnerships And Corporate Joint Ventures [Member] | PSEG Power LLC
Long-Term Investments [Line Items]
Long-Term Investments	[1]	64	66
Partnerships And Corporate Joint Ventures [Member] | PSEG Power LLC | Kalaeloa [Member]
Long-Term Investments [Line Items]
Long-Term Investments		$ 64	$ 66

[1] During the three years ended December 31, 2020, 2019 and 2018, dividends from these investments were $15 million, $15 million and $16 million, respectively.