Pension And OPEB (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Pension Lift Out Settlement Charge	$ 332		$ 332
Pension Lift Out Settlement Charge, net of tax	239		239
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	349	$ (28)	389	$ (86)
Pension Lift Out Settlement Charge	332	0	332	0
Pension Plan [Member] | Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	10	(18)	37	(53)
Postretirement Healthcare Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	(11)	(31)	(32)	(93)
Pension Lift Out Settlement Charge	0	0	0	0
Postretirement Healthcare Plans [Member] | Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	(11)	(27)	(31)	(82)
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	9	15	18	30
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Postretirement Healthcare Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	$ 3	$ 2	$ 9	$ 7