Pension And OPEB (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	$ 17	$ 20
Pension Plan [Member] | Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	11	13
Postretirement Healthcare Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	1	(11)
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	5
Postretirement Healthcare Plans [Member] | Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	0	(10)
Long Island Electric Utility Servco LLC Pension and OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	25
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	6	5
Long Island Electric Utility Servco LLC Pension and OPEB [Member] | Postretirement Healthcare Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Benefit Costs	$ 3	$ 3