Financial Risk Management Activities (Schedule Of Gross Volume On Absolute Basis For Derivative Contracts) (Details)	Sep. 30, 2011	Dec. 31, 2010
Natural Gas Dth [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	593,000,000	704,000,000
Electricity MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	145,000,000	154,000,000
Capacity MW Days [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis		1,000,000
FTRs MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	20,000,000	23,000,000
Interest Rate Swaps [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	1,400,000,000	1,150,000,000
Power [Member] | Natural Gas Dth In Millions [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	350,000,000	424,000,000
PSE&G [Member] | Natural Gas Dth In Millions [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	243,000,000	280,000,000
PSEG [Member] | Natural Gas Dth In Millions [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	0	0
Power [Member] | Electricity MWh In Millions [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	145,000,000	154,000,000
PSE&G [Member] | Electricity MWh In Millions [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	0	0
PSEG [Member] | Electricity MWh In Millions [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	0	0
Power [Member] | Capacity MW Days In Millions [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis		1,000,000
PSE&G [Member] | Capacity MW Days In Millions [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis		0
PSEG [Member] | Capacity MW Days In Millions [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis		0
Power [Member] | FTRs MWh In Millions [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	20,000,000	23,000,000
PSE&G [Member] | FTRs MWh In Millions [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	0	0
PSEG [Member] | FTRs MWh In Millions [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	0	0
Power [Member] | Interest Rate Swaps USD In Millions [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	0	0
PSE&G [Member] | Interest Rate Swaps USD In Millions [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	0	0
PSEG [Member] | Interest Rate Swaps USD In Millions [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	1,400,000,000	1,150,000,000