Regulatory Assets And Liabilities (Significant Orders and Pending Filings) (Details) $ in Millions	1 Months Ended								12 Months Ended
	Jan. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Nov. 30, 2020 USD ($)	Oct. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Aug. 31, 2020 USD ($)	Jul. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)
Regulatory Assets And Liabilities [Line Items]
Maximum U.S. Corporate Income Tax Rate									21.00%
Regulatory Assets		$ 3,872.0							$ 3,872.0	$ 3,677.0
Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Proposed BGSS rate per therm		0.32							0.32
Regulatory Assets		$ 4,241.0							$ 4,241.0	4,028.0
Regulatory Liabilities		3,001.0							3,001.0	3,236.0
Flowback of tax benefits									31.0	58.0
Regulatory Assets		3,872.0							3,872.0	3,677.0
Public Service Electric and Gas Company | Weather Normalization Clause [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount			$ (2.0)	$ 10.0
Public Service Electric and Gas Company | ZEC Liability
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		(6.2)
ZEC purchases									154.0
Public Service Electric and Gas Company | ZEC overcollection for May 2020 year end [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		(6.0)
Public Service Electric and Gas Company | ZEC overcollection for May 2019 year end [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		(0.2)
Tax Adjustment Credits Electric Distribution [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount							$ (25.0)
Flowback of unprotected tax benefits total									50.0
Tax Adjustment Credits Gas Distribution [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount							(29.0)
Flowback of unprotected tax benefits total									46.0
Remediation Adjustment Clause [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount					$ 53.0
Public Utilities, Requested Rate Increase (Decrease), Amount		(35.0)
Transmission related over remaining useful life [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Excess Deferred income taxes to be refunded										940.0
unprotected distribution related over remaining useful life [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Excess Deferred income taxes to be refunded										520.0
protected distribution related over remaining useful life [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Excess Deferred income taxes to be refunded										933.0
distributed related repair deductions [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Excess Deferred income taxes to be refunded										500.0
Transition Incentive Program [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount						$ 23.0
Unprotected Transmission related [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Flowback of unprotected tax benefits total									38.0
Clean Energy Future - Energy Efficiency | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, approved investment					$ 1,000.0
Gas Societal Benefit Clause | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount			18.0
Electric Societal Benefits Clause | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount			(76.0)
Subsequent Event [Member] | Tax Adjustment Credits Electric Distribution [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 26.0
Subsequent Event [Member] | Tax Adjustment Credits Gas Distribution [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	(48.0)
Subsequent Event [Member] | Clean Energy Future - Energy Cloud [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, approved investment	700.0
Subsequent Event [Member] | Clean Energy Future - Electric Vehicles [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, approved investment	166.0
Solar or EE Recovery Charge (RRC) [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets		139.0							139.0	118.0
Tax Adjustment Credit [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets											$ 581.0
Regulatory Liabilities											$ 581.0
COVID-19 Deferral | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets		51.0							51.0	$ 0.0
COVID-19 Deferral - Bad Debt portion [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets		29.0							$ 29.0
Energy Strong II [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		(13.0)
Gas System Modernization Program II [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount			$ 20.0				$ 18.0
Public Utilities, Requested Rate Increase (Decrease), Amount		$ (26.0)
Green Program Recovery Gas portion [Member] | Subsequent Event [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	20.0
Formula Rate True up | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount				$ 119.0				$ 24.0
Green Program Recovery electric portion [Member] | Subsequent Event [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 67.0