Rate Filings (Details) - PSE And G [Member] $ in Millions	1 Months Ended				3 Months Ended		6 Months Ended	12 Months Ended
	Jul. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Apr. 30, 2018 USD ($)	Jan. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($) $ / DTH	Jun. 30, 2018 USD ($)	Dec. 31, 2018	Dec. 31, 2017
Regulatory Assets And Liabilities [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent									35.00%
Proposed BGSS rate per therm		0.35			0.35		0.35
Self Implementing Bill Credit per therm | $ / DTH						0.15
BGSS Revenue Reduction		$ 26.0				$ 125.0
Current BGSS rate per therm		0.37			0.37		0.37
True-up adjustment for Transmission Formula Rate Revenues		$ (27.0)			$ (27.0)		$ (27.0)
Transmission Formula Rate [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount				$ 148.0
Electric Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount							71.0
Gas Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount							43.0
Distribution Base rates [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Percentage					3.00%
Gas Weather Normalization Deferral [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		14.0	$ 55.0
Subsequent Event [Member]
Regulatory Assets And Liabilities [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent								21.00%
Subsequent Event [Member] | Gas System Modernization Program [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ (26.0)
2016 to 2017 [Member] | Gas Weather Normalization Deferral [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		23.0	31.0
2015 to 2016 [Member] | Gas Weather Normalization Deferral [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount			$ 24.0
2017 to 2018 [Member] | Gas Weather Normalization Deferral [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		$ 9.0
Energy Strong program [Member] | Electric Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount							8.0
Solar or EE Recovery Charge (RRC) [Member] | Electric Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount							20.0
Solar or EE Recovery Charge (RRC) [Member] | Gas Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount							$ (0.8)