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Financial Risk Management Activities (Schedule Of Gross Volume, On Absolute Basis For Derivative Contracts) (Detail) $ / mwh in Millions, $ / DTH in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 $ / mwh $ / DTH | Dec. 31, 2017 $ / mwh $ / DTH
Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | $ / DTH | 281 | 154
Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | (66) | (63)
FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 24 | 6
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
Power [Member] | Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | $ / DTH | 281 | 154
Power [Member] | Electricity MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | (66) | (63)
Power [Member] | FTRs MWh [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | 24 | 6
PSE And G [Member] | Natural Gas Dth [Member] |  |
Derivative [Line Items] |  |
Gross Volume of Derivative on Absolute Value Basis | $ / DTH | 0 | 0
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

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