Trust Investments (Fair Value Of Rabbi Trust) (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	$ 246	$ 224
PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	62	56
Public Service Electric and Gas Company [Member]
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	48	45
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	246	224
Rabbi Trust [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	62	56
Rabbi Trust [Member] | Public Service Electric and Gas Company [Member]
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	48	45
Rabbi Trust [Member] | Other Entity [Member]
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	$ 136	$ 123