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, 2017 $ / DTH $ / mwh	Dec. 31, 2016 $ / DTH $ / mwh $ / Derivative
Natural Gas Dth [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	154	122
Electricity MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	(63)	(44)
FTRs MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	6	9
Interest Rate Swaps [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis | $ / Derivative		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
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
Power [Member] | Natural Gas Dth [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis | $ / DTH	154	113
Power [Member] | Electricity MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	(63)	(44)
Power [Member] | FTRs MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	6	9
Power [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis | $ / Derivative		0
PSE&G [Member] | Natural Gas Dth [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis | $ / DTH	0	9
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