Financial Risk Management Activities (Schedule Of Gross Volume, On Absolute Basis For Derivative Contracts) (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Natural Gas Dth [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	274,000,000	614,000,000
Electricity MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	310,000,000	243,000,000
FTRs MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	15,000,000	16,000,000
Interest Rate Swaps [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	850,000,000	850,000,000
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	850,000,000	850,000,000
Power [Member] | Natural Gas Dth [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	216,000,000	466,000,000
Power [Member] | Electricity MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	310,000,000	243,000,000
Power [Member] | FTRs MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	15,000,000	16,000,000
Power [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	0	0
PSE&G [Member] | Natural Gas Dth [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	58,000,000	148,000,000
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	0	0