Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Taxes [Line Items]
Federal income tax rate	21.00%
Regulatory Liabilities	$ 2,240	$ 2,497
NOL Carryforwards	60
Tax Adjustment Credit	(193)	(171)	$ (205)
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	28	0	116
Public Service Electric and Gas Company
Income Taxes [Line Items]
Regulatory Liabilities	2,240	2,497
NOL Carryforwards	29
Excess deferred income tax flowback	269
Tax Adjustment Credit	(193)	(171)	(205)
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	0	$ 0	$ 64
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	234
Reduction in Deferred Tax Liabilities	1,500
Regulatory Liabilities	$ 2,000