Rate Filings (Details) - PSE And G [Member] - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2017	Mar. 31, 2017
Electric Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 22
Gas Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		3
Subsequent Event [Member] | Gas Weather Normalization Deferral [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 54
Solar or EE Recovery Charge (RRC) [Member] | Electric Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		37
Solar or EE Recovery Charge (RRC) [Member] | Gas Distribution [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		13
Stranded Costs [Member]
Regulatory Assets And Liabilities [Line Items]
Public Utilities, Approved Rate Increase (Decrease), Amount		$ (5)