Long-Term Investments (Equity Method Investments) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018
Long-Term Investments [Line Items]
Long-Term Investments		$ 812		$ 896
Keystone [Member]
Long-Term Investments [Line Items]
Location of the affiliated companies, equity method investments		PA
Owned percentage		23.00%
Conemaugh [Member]
Long-Term Investments [Line Items]
Location of the affiliated companies, equity method investments		PA
Owned percentage		23.00%
Kalaeloa [Member]
Long-Term Investments [Line Items]
Location of the affiliated companies, equity method investments		HI
Owned percentage		50.00%
PSEG Power LLC
Long-Term Investments [Line Items]
Long-Term Investments		$ 66		86
Partnerships And Corporate Joint Ventures [Member] | PSEG Power LLC
Long-Term Investments [Line Items]
Long-Term Investments	[1]	66		86
Partnerships And Corporate Joint Ventures [Member] | PSEG Power LLC | Keystone [Member]
Long-Term Investments [Line Items]
Long-Term Investments		0	[2]	9
Partnerships And Corporate Joint Ventures [Member] | PSEG Power LLC | Conemaugh [Member]
Long-Term Investments [Line Items]
Long-Term Investments		0	[2]	8
Partnerships And Corporate Joint Ventures [Member] | PSEG Power LLC | Kalaeloa [Member]
Long-Term Investments [Line Items]
Long-Term Investments		$ 66		$ 69

[1] During the three years ended December 31, 2019, 2018 and 2017, dividends from these investments were $15 million, $16 million and $18 million, respectively.

[2] In September 2019, PSEG Power completed the sale of its ownership interests in the Keystone and Conemaugh generation plants and related assets and liabilities.