Financial Risk Management Activities (Schedule Of Gross Volume, On Absolute Basis For Derivative Contracts) (Detail) $ / mwh in Millions, $ / Derivative in Millions, $ / DTH in Millions	12 Months Ended
	Dec. 31, 2015 $ / DTH $ / mwh $ / Derivative	Dec. 31, 2014 $ / DTH $ / mwh $ / Derivative
Natural Gas Dth [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	201	274
Electricity MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	299	310
FTRs MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	23	15
Interest Rate Swaps [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis | $ / Derivative	550	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
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	550	850
Power [Member] | Natural Gas Dth [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis | $ / DTH	168	216
Power [Member] | Electricity MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	299	310
Power [Member] | FTRs MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	23	15
Power [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis | $ / Derivative	0	0
PSE&G [Member] | Natural Gas Dth [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis | $ / DTH	33	58
PSE&G [Member] | Electricity MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	0	0
PSE&G [Member] | FTRs MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	0	0
PSE&G [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis | $ / Derivative	0	0