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, 2019 $ / Derivative $ / DTH $ / mwh	Dec. 31, 2018 $ / DTH $ / mwh
Natural Gas Dth [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	341	358
Electricity MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	(62)	(74)
FTRs MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	13	18
Interest Rate Swaps [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis | $ / Derivative	700
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	700
PSEG Power LLC | Natural Gas Dth [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis | $ / DTH	341	358
PSEG Power LLC | Electricity MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	(62)	(74)
PSEG Power LLC | FTRs MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	13	18
PSEG Power LLC | Interest Rate Swaps [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis | $ / Derivative	0
Public Service Electric and Gas Company | Natural Gas Dth [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis | $ / DTH	0	0
Public Service Electric and Gas Company | Electricity MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	0	0
Public Service Electric and Gas Company | FTRs MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	0	0
Public Service Electric and Gas Company | Interest Rate Swaps [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis | $ / Derivative	0