Trust Investments (Fair Value Of Rabbi Trust) (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Schedule of Trust Investments [Line Items]
Rabbi Trust	$ 266	$ 246
Public Service Electric and Gas Company
Schedule of Trust Investments [Line Items]
Rabbi Trust	51	48
PSEG Power LLC
Schedule of Trust Investments [Line Items]
Rabbi Trust	66	62
Rabbi Trust [Member]
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	266	246
Rabbi Trust [Member] | Public Service Electric and Gas Company
Schedule of Trust Investments [Line Items]
Rabbi Trust	51	48
Rabbi Trust [Member] | PSEG Power LLC
Schedule of Trust Investments [Line Items]
Rabbi Trust	66	62
Rabbi Trust [Member] | Other [Member]
Schedule of Trust Investments [Line Items]
Rabbi Trust	$ 149	$ 136