Financial Risk Management Activities (Schedule Of Gross Volume On Absolute Basis For Derivative Contracts) (Details)	Jun. 30, 2011	Dec. 31, 2010
Natural Gas Dth [Member]
Gross volume of derivative on absolute value basis	779,000,000	704,000,000
Electricity MWh [Member]
Gross volume of derivative on absolute value basis	175,000,000	154,000,000
Capacity MW Days [Member]
Gross volume of derivative on absolute value basis		1,000,000
FTRs MWh [Member]
Gross volume of derivative on absolute value basis	26,000,000	23,000,000
Interest Rate Swaps [Member]
Gross volume of derivative on absolute value basis	1,150,000,000	1,150,000,000
Power [Member] | Natural Gas Dth in Millions [Member]
Gross volume of derivative on absolute value basis	526,000,000	424,000,000
PSE&G [Member] | Natural Gas Dth in Millions [Member]
Gross volume of derivative on absolute value basis	253,000,000	280,000,000
PSEG [Member] | Natural Gas Dth in Millions [Member]
Gross volume of derivative on absolute value basis	0	0
Power [Member] | Electricity MWh in Millions [Member]
Gross volume of derivative on absolute value basis	175,000,000	154,000,000
PSE&G [Member] | Electricity MWh in Millions [Member]
Gross volume of derivative on absolute value basis	0	0
PSEG [Member] | Electricity MWh in Millions [Member]
Gross volume of derivative on absolute value basis	0	0
Power [Member] | Capacity MW Days in Millions [Member]
Gross volume of derivative on absolute value basis		1,000,000
PSE&G [Member] | Capacity MW Days in Millions [Member]
Gross volume of derivative on absolute value basis		0
PSEG [Member] | Capacity MW Days in Millions [Member]
Gross volume of derivative on absolute value basis		0
Power [Member] | FTRs MWh in Millions [Member]
Gross volume of derivative on absolute value basis	26,000,000	23,000,000
PSE&G [Member] | FTRs MWh in Millions [Member]
Gross volume of derivative on absolute value basis	0	0
PSEG [Member] | FTRs MWh in Millions [Member]
Gross volume of derivative on absolute value basis	0	0
Power [Member] | Interest Rate Swaps USD in Millions [Member]
Gross volume of derivative on absolute value basis	0	0
PSE&G [Member] | Interest Rate Swaps USD in Millions [Member]
Gross volume of derivative on absolute value basis	0	0
PSEG [Member] | Interest Rate Swaps USD in Millions [Member]
Gross volume of derivative on absolute value basis	1,150,000,000	1,150,000,000