Pension And OPEB (Schedule Of Pension And OPEB Costs) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	$ (7)	$ (9)	$ 18	$ (27)
Pension Benefits [Member] | Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	(6)	(8)	7	(23)
Pension Benefits [Member] | PSEG Power [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	(2)	(2)	5	(7)
Pension Benefits [Member] | Other Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	1	1	6	3
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	(14)	26	(44)	79
OPEB [Member] | Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	(14)	17	(46)	51
OPEB [Member] | PSEG Power [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	0	8	2	24
OPEB [Member] | Other Entity [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	$ 0	$ 1	$ 0	$ 4