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	12 Months Ended
	Sep. 30, 2015 $ / mwh $ / DTH $ / Derivative	Dec. 31, 2014 $ / mwh $ / DTH $ / Derivative
Natural Gas Dth [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis | $ / DTH	193	274
Electricity MWh [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis	291	310
FTRs MWh [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis	21	15
Interest Rate Swaps [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis | $ / Derivative	850	850
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	850	850
Power [Member] | Natural Gas Dth [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis | $ / DTH	154	216
Power [Member] | Electricity MWh [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis	291	310
Power [Member] | FTRs MWh [Member]
Derivative [Line Items]
Gross Volume of Derivative on Absolute Value Basis	21	15
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	39	58
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