Financial Risk Management Activities (Schedule Of Gross Volume, On Absolute Basis For Derivative Contracts) (Detail)	Jun. 30, 2012	Dec. 31, 2011
Natural Gas Dth [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	720	612
Electricity MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	160	137
Capacity MW Days [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	4
FTRs MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	36	12
Interest Rate Swaps [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	1,100	1,100
Coal Tons [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	1	1
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	0
PSEG [Member] | Capacity MW Days [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	1,100	1,100
PSEG [Member] | Coal Tons [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	0	0
Power [Member] | Natural Gas Dth [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	507	377
Power [Member] | Electricity MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	160	137
Power [Member] | Capacity MW Days [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	0
Power [Member] | FTRs MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	36	12
Power [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	0	0
Power [Member] | Coal Tons [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	1	1
PSE And G [Member] | Natural Gas Dth [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	213	235
PSE And G [Member] | Electricity MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	0	0
PSE And G [Member] | Capacity MW Days [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	4
PSE And G [Member] | FTRs MWh [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	0	0
PSE And G [Member] | Interest Rate Swaps [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	0	0
PSE And G [Member] | Coal Tons [Member]
Derivative [Line Items]
Gross volume of derivative on absolute value basis	0	0