Pension And OPEB (Schedule Of Pension And OPEB Costs) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	$ (7)	$ (7)	$ (21)	$ 18
Pension Benefits [Member] | Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	(7)	(6)	(20)	7
Pension Benefits [Member] | PSEG Power [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	(1)	(2)	(4)	5
Pension Benefits [Member] | Other Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	1	1	3	6
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	(20)	(14)	(58)	(44)
OPEB [Member] | Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	(19)	(14)	(57)	(46)
OPEB [Member] | PSEG Power [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	0	0	0	2
OPEB [Member] | Other Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	$ (1)	$ 0	$ (1)	$ 0