Pension And OPEB (Schedule Of Pension And OPEB Costs) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	$ 13	$ (9)	$ 25	$ (18)
Pension Benefits [Member] | Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	6	(7)	13	(15)
Pension Benefits [Member] | PSEG Power [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	4	(3)	7	(5)
Pension Benefits [Member] | Other Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	3	1	5	2
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	(15)	27	(30)	53
OPEB [Member] | Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	(16)	17	(32)	34
OPEB [Member] | PSEG Power [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	1	8	2	16
OPEB [Member] | Other Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	$ 0	$ 2	$ 0	$ 3