Rate Filings (Details) - PSE And G [Member] $ in Millions	1 Months Ended			2 Months Ended	9 Months Ended
	Oct. 31, 2018 USD ($)	Aug. 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Feb. 28, 2018 USD ($)	Sep. 30, 2018 USD ($)
Regulatory Assets And Liabilities [Line Items]
Proposed BGSS rate per therm					0.35
Current BGSS rate per therm					0.37
True-up adjustment for Transmission Formula Rate Revenues					$ 27.0
BGSS [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount					26.0
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
Gas Weather Normalization Deferral [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount			$ (55.0)
Electric Green Program Recovery [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount					65.0
Gas Green Program Recovery [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount					6.0
Subsequent Event [Member] | Remediation Adjustment Clause Other Sbc [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 63.0
Subsequent Event [Member] | Transmission related unprotected deferred taxes [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	(155.0)
Subsequent Event [Member] | Transmission Formula Rate [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	100.0
Subsequent Event [Member] | Distribution Base rates [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	13.0
Public Utilities, Approved Rate Base	$ 9,500.0
Public Utilities, Approved Return on Equity, Percentage	9.60%
Public Utilities, Approved Equity Capital Structure, Percentage	54.00%
Subsequent Event [Member] | One-time refund for taxes collected [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 28.0
Subsequent Event [Member] | Gas Weather Normalization Deferral [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	(14.0)
Subsequent Event [Member] | Gas System Modernization Program [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	21.0
2016 to 2017 [Member] | Gas Weather Normalization Deferral [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount			(31.0)
2016 to 2017 [Member] | Subsequent Event [Member] | Gas Weather Normalization Deferral [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	(23.0)
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] | Subsequent Event [Member] | Gas Weather Normalization Deferral [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	(9.0)
Solar or EE Recovery Charge (RRC) [Member] | Subsequent Event [Member] | Electric Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	(58.0)
Solar or EE Recovery Charge (RRC) [Member] | Subsequent Event [Member] | Gas Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	(15.0)
Energy Strong program [Member] | Electric Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		$ (1.0)		$ (8.0)
Energy Strong program [Member] | Gas Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		$ 0.0
Green Program Recovery Charge (RRC) [Member] | Electric Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount					(20.0)
Green Program Recovery Charge (RRC) [Member] | Gas Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount					$ 0.8
Base Revenues [Member] | Subsequent Event [Member] | Distribution Base rates [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	(212.0)
Return of Tax Benefits [Member] | Subsequent Event [Member] | Distribution Base rates [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 225.0