Trust Investments (Fair Value Of Rabbi Trust) (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	$ 245	$ 266
PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	64	66
Public Service Electric and Gas Company [Member]
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	44	51
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	245	266
Rabbi Trust [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	64	66
Rabbi Trust [Member] | Public Service Electric and Gas Company [Member]
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	44	51
Rabbi Trust [Member] | Other Entity [Member]
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	$ 137	$ 149