Financial Risk Management Activities (Schedule Of Gross Volume, On Absolute Basis For Derivative Contracts) (Detail) $ / mwh in Millions, $ / Derivative in Millions, $ / DTH in Millions	9 Months Ended
	Sep. 30, 2017 $ / Derivative $ / mwh $ / DTH	Sep. 30, 2016 $ / Derivative $ / mwh $ / DTH
Natural Gas Dth [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis | $ / DTH	265	357
Electricity MWh [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis	332	323
FTRs MWh [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis	5	9
Interest Rate Swaps [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis | $ / Derivative	500	500
PSEG [Member] | Natural Gas Dth [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis	0	0
PSEG [Member] | Electricity MWh [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis	0	0
PSEG [Member] | FTRs MWh [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis	0	0
PSEG [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis | $ / Derivative	500	500
Power [Member] | Natural Gas Dth [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis | $ / DTH	265	348
Power [Member] | Electricity MWh [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis	332	323
Power [Member] | FTRs MWh [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis	5	9
Power [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis | $ / Derivative	0	0
PSE And G [Member] | Natural Gas Dth [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis | $ / DTH	0	9
PSE And G [Member] | Electricity MWh [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis	0	0
PSE And G [Member] | FTRs MWh [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis	0	0
PSE And G [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis | $ / Derivative	0	0