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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 | 12 Months Ended
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Dec. 31, 2017 $ / DTH $ / mwh | Dec. 31, 2016 $ / DTH $ / mwh $ / Derivative
Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | 154 | 122
Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | (63) | (44)
FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | 6 | 9
Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | $ / Derivative |  | 500
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 |
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 |  | 500
Power [Member] | Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | $ / DTH | 154 | 113
Power [Member] | Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | (63) | (44)
Power [Member] | FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | 6 | 9
Power [Member] | Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | $ / Derivative |  | 0
PSE&G [Member] | Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | $ / DTH | 0 | 9
PSE&G [Member] | Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | 0 | 0
PSE&G [Member] | FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | 0 | 0
PSE&G [Member] | Interest Rate Swaps [Member] |  |
Derivative [Line Items] |  |
Gross volume of derivative on absolute value basis | $ / Derivative |  | 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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