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Financial Risk Management Activities (Schedule Of Gross Volume, On Absolute Basis For Derivative Contracts) (Detail) $ / mwh in Millions, $ / Derivative in Millions, $ / DTH in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2015 $ / Derivative $ / mwh $ / DTH | Dec. 31, 2014 $ / Derivative $ / mwh $ / DTH
Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | $ / DTH | 259 | 274
Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 299 | 310
FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 30 | 15
Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | $ / Derivative | 850 | 850
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] | 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 | 850 | 850
Power [Member] | Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | $ / DTH | 214 | 216
Power [Member] | Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 299 | 310
Power [Member] | FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 30 | 15
Power [Member] | Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | $ / Derivative | 0 | 0
PSE And G [Member] | Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | $ / DTH | 45 | 58
PSE And G [Member] | Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 0 | 0
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 | $ / Derivative | 0 | 0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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