Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Taxes [Line Items]
Federal income tax rate	21.00%
Regulatory Liabilities	$ 2,075	$ 2,240
NOL Carryforwards	33
Tax Adjustment Credit	(232)	(193)	$ (171)
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	10	28	0
Public Service Electric and Gas Company
Income Taxes [Line Items]
Regulatory Liabilities	2,075	2,240
NOL Carryforwards	71
Excess deferred income tax flowback	323
Tax Adjustment Credit	(232)	(193)	(171)
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	7	$ 0	$ 0
Excess Deferred Income Taxes excluding amounts from previously realized repair deductions [Member] | Public Service Electric and Gas Company
Income Taxes [Line Items]
Reduction in Regulatory Liability	243
Reduction in Deferred Tax Liabilities	1,300
Regulatory Liabilities	$ 1,800