Pension And OPEB (Schedule Of Pension And OPEB Costs) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	$ (21)	$ (7)	$ (62)	$ (21)
Pension Benefits [Member] | Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	(16)	(7)	(48)	(20)
Pension Benefits [Member] | PSEG Power [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	(4)	(1)	(13)	(4)
Pension Benefits [Member] | Other Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	(1)	1	(1)	3
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	(24)	(20)	(72)	(58)
OPEB [Member] | Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	(23)	(19)	(69)	(57)
OPEB [Member] | PSEG Power [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	(1)	0	(2)	0
OPEB [Member] | Other Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	$ 0	$ (1)	$ (1)	$ (1)