Rate Filings (Details) - Public Service Electric and Gas Company [Member] $ in Millions	1 Months Ended
	Jul. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Apr. 30, 2020 USD ($)
Regulatory Assets And Liabilities [Line Items]
Proposed BGSS rate per therm		0.32
Transmission Formula Rate [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 24
Transition Renewable Incentive Certificates [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 23
Electric Green Program Recovery [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		67
Gas Green Program Recovery [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		20
Gas System Modernization Program II [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		22
Tax Adjustment Credits Electric Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Flowback of unprotected tax benefits total			50
Flowback of unprotected tax benefits current year			10
Tax Adjustment Credits Gas Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Flowback of unprotected tax benefits total			46
Flowback of unprotected tax benefits current year			$ 19
Subsequent Event [Member] | Transmission Formula Rate [Member]
Regulatory Assets And Liabilities [Line Items]
Flowback of unprotected tax benefits total	$ 37
Subsequent Event [Member] | Gas System Modernization Program II [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	18
Subsequent Event [Member] | Tax Adjustment Credits Electric Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	(25)
Subsequent Event [Member] | Tax Adjustment Credits Gas Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ (29)
2019 to 2020 [Member] | Gas Weather Normalization Deferral [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ (34)