Regulatory Assets And Liabilities (Significant Orders and Pending Filings) (Details)	1 Months Ended											12 Months Ended
	Feb. 29, 2020 USD ($)	Jan. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Nov. 30, 2019 USD ($)	Oct. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Aug. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	May 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017
Regulatory Assets And Liabilities [Line Items]
Maximum U.S. Corporate Income Tax Rate												21.00%	21.00%	35.00%
Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Current BGSS rate per therm						0.35
Proposed BGSS rate per therm			0.32			0.34						0.32
Self-implementing rate reduction			$ 0.02
ZEC Charge per kwh												$ 0.004
Zero Emission Certificate purchases												17,000,000
Zero Emission Certificate overcollections												$ 200,000
Distribution Base rates [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount											$ (13,000,000)
Public Utilities, Approved Rate Base											$ 9,500,000,000
Public Utilities, Approved Return on Equity, Percentage											9.60%
Public Utilities, Approved Equity Capital Structure, Percentage											54.00%
Revenue Subject to Refund [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount											$ (28,000,000)
Transmission Formula Rate [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount					$ 332,000,000			$ 52,000,000
Gas Distribution [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount													$ (43,000,000)
Gas System Modernization Program [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount						$ 11,000,000
Electric Distribution [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount													$ (71,000,000)
Weather Normalization Clause [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount										$ 14,000,000
Electric Green Program Recovery [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount									$ 65,000,000
Gas Green Program Recovery [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount									$ 6,000,000
Remediation Adjustment Clause [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount							$ 73,000,000
BGSS [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount						(34,000,000)
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				$ 17,000,000
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 18,000,000
Energy Efficiency Green Program Recovery [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount						27,000,000
Energy Efficiency Green Program Administrative Costs [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount						6,000,000
Subsequent Event [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Self-implementing bill credit	$ 0.075
Subsequent Event [Member] | Societal Benefits Charge Electric Distribution [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		$ (27,000,000)
Subsequent Event [Member] | Societal Benefits Charge Gas Distribution [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		(7,000,000)
Subsequent Event [Member] | 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		(15,000,000)
Subsequent Event [Member] | 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		(10,000,000)
Subsequent Event [Member] | Electric Green Program Recovery [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		52,000,000
Subsequent Event [Member] | Gas Green Program Recovery [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		11,000,000
Subsequent Event [Member] | Remediation Adjustment Clause [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 53,000,000
Subsequent Event [Member] | Energy Efficiency Green Program Recovery [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	111,000,000
Subsequent Event [Member] | Energy Efficiency Green Program Administrative Costs [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 19,000,000
2018 to 2019 [Member] | Weather Normalization Clause [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount						$ (8,000,000)
2017 to 2018 [Member] | Weather Normalization Clause [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount										(9,000,000)
2016 to 2017 [Member] | Weather Normalization Clause [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount										$ 23,000,000
Base Revenues [Member] | Distribution Base rates [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount											212,000,000
Return of Tax Benefits [Member] | Distribution Base rates [Member] | Public Service Electric and Gas Company
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount											$ (225,000,000)