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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, 2016 $ / mwh $ / Derivative $ / DTH | Dec. 31, 2015 $ / mwh $ / Derivative $ / DTH
Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | $ / DTH | 347 | 201
Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 326 | 299
FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 21 | 23
Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | $ / Derivative | 1,050 | 550
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 | 1,050 | 550
Power [Member] | Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | $ / DTH | 327 | 168
Power [Member] | Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 326 | 299
Power [Member] | FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 21 | 23
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 | 20 | 33
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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