Trust Investments (Fair Value Of Rabbi Trust) (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	$ 240	$ 224
PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	61	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	240	224
Rabbi Trust [Member] | PSEG Power [Member]
Schedule of Trust Investments [Line Items]
Total Rabbi Trust Investments	61	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	$ 131	$ 123