Rate Filings (Details) - Public Service Electric and Gas Company [Member] $ in Millions	1 Months Ended
	Oct. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Aug. 31, 2020 USD ($)	Jul. 31, 2020 USD ($)	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, Approved Rate Increase (Decrease), Amount				$ (38)
Public Utilities, Requested Rate Increase (Decrease), Amount					$ 24
Transition Renewable Incentive Certificates [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved 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, Approved Rate Increase (Decrease), Amount				18
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 20
Tax Adjustment Credits Electric Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount				(25)
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]
Public Utilities, Approved Rate Increase (Decrease), Amount				$ (29)
Flowback of unprotected tax benefits total						46
Flowback of unprotected tax benefits current year						$ 19
COVID-19 deferrals [Member]
Regulatory Assets And Liabilities [Line Items]
Regulatory Assets		35
Remediation Adjustment Charge [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		53
Subsequent Event [Member] | Transmission Formula Rate [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 119
Subsequent Event [Member] | Tax Adjustment Credits Electric Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	(23)
Subsequent Event [Member] | Tax Adjustment Credits Gas Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 49
2019 to 2020 [Member] | Gas Weather Normalization Deferral [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		$ 10