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