Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Taxes [Line Items]
Federal income tax rate	21.00%
Regulatory Liabilities	$ 2,497	$ 2,707
NJ tax surcharge percent for 2020 to 2021 extended to 2023	2.50%
Tax Adjustment Credit	$ (171)	(205)	$ (272)
NJ tax surcharge percent for 2018 to 2019	1.50%
Public Service Electric and Gas Company
Income Taxes [Line Items]
Regulatory Liabilities	$ 2,497	2,707
NOL Carryforwards	15
Excess deferred income tax flowback	238
Tax Adjustment Credit	(171)	(205)	$ (272)
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	$ 215
Reduction in Deferred Tax Liabilities		1,700
Regulatory Liabilities		$ 2,400