Long-Term Investments (Schedule Of Long Term Investments) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Long-Term Investments [Line Items]
Total Long-Term Investments		$ 812	$ 896
Dividends in equity method investments		15	16	$ 18
PSEG Power LLC
Long-Term Investments [Line Items]
Total Long-Term Investments		66	86
Public Service Electric and Gas Company
Long-Term Investments [Line Items]
Total Long-Term Investments		248	270
Life Insurance And Supplemental Benefits [Member] | Public Service Electric and Gas Company
Long-Term Investments [Line Items]
Total Long-Term Investments		111	121
Solar Loan Investment [Member] | Public Service Electric and Gas Company
Long-Term Investments [Line Items]
Total Long-Term Investments		137	149
Partnerships And Corporate Joint Ventures [Member] | PSEG Power LLC
Long-Term Investments [Line Items]
Total Long-Term Investments	[1]	66	86
Partnerships And Corporate Joint Ventures [Member] | Equity Method Investments [Member] | Energy Holdings [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments		1	0
Leases [Member] | Energy Holdings [Member]
Long-Term Investments [Line Items]
Total Long-Term Investments		$ 497	$ 540

[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.