Pension And OPEB (Schedule Of Pension And OPEB Costs) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	$ (21)	$ (7)	$ (41)	$ (14)
Pension Benefits [Member] | Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	(16)	(6)	(32)	(13)
Pension Benefits [Member] | PSEG Power [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	(5)	(2)	(9)	(3)
Pension Benefits [Member] | Other Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	0	1	0	2
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	(24)	(19)	(48)	(38)
OPEB [Member] | Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	(23)	(19)	(46)	(38)
OPEB [Member] | PSEG Power [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	0	0	(1)	0
OPEB [Member] | Other Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefits (Credits) Costs	$ (1)	$ 0	$ (1)	$ 0