Rate Filings (Details) - Public Service Electric and Gas Company [Member]	1 Months Ended						9 Months Ended
	Oct. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Aug. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	May 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)
Regulatory Assets And Liabilities [Line Items]
ZEC Charge per kwh							$ 0.004
Zero Emission Certificate purchases							$ 17,000,000
Current BGSS rate per therm		0.35					0.35
Proposed BGSS rate per therm		0.34					0.34
Zero Emission Certificate overcollections							$ 200,000
Transmission Formula Rate [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount				$ 52,000,000
Tax Adjustment Credits Electric Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ (15,000,000)
Tax Adjustment Credits Gas Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		(10,000,000)
Electric Green Program Recovery [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount					$ 65,000,000
Public Utilities, Requested Rate Increase (Decrease), Amount				52,000,000
Gas Green Program Recovery [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount					$ 6,000,000
Public Utilities, Requested Rate Increase (Decrease), Amount				$ 11,000,000
Gas System Modernization Program II [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		17,000,000
Energy Efficiency Green Program Recovery [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		27,000,000
Energy Efficiency Green Program Administrative Costs [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		6,000,000
Gas Weather Normalization Deferral [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount						$ 14,000,000
Remediation Adjustment Clause [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount			$ 73,000,000
Gas System Modernization Program [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		11,000,000
BGSS [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		(13,000,000)
2016 to 2017 [Member] | Gas Weather Normalization Deferral [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount						23,000,000
2017 to 2018 [Member] | Gas Weather Normalization Deferral [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount						$ (9,000,000)
2018 to 2019 [Member] | Gas Weather Normalization Deferral [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		$ (8,000,000)
Subsequent Event [Member] | Transmission Formula Rate [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 332,000,000