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Financial Risk Management Activities (Schedule Of Derivative Instruments Not Designated As Hedging Instruments And Impact On Results Of Operations) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |
Pre-Tax Gain (Loss) Recognized in Income on Derivatives | $ (66)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | $ (681)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Operating Revenues [Member] | Energy-Related Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Pre-Tax Gain (Loss) Recognized in Income on Derivatives | (76)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeByNatureAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_IncomeStatementLocationAxis = pseg_OperatingRevenuesMember | (794)us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeByNatureAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_IncomeStatementLocationAxis = pseg_OperatingRevenuesMember
Energy Costs [Member] | Energy-Related Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Pre-Tax Gain (Loss) Recognized in Income on Derivatives | $ 10 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeByNatureAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_IncomeStatementLocationAxis = pseg_EnergyCostsMember | $ 113 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeByNatureAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_IncomeStatementLocationAxis = pseg_EnergyCostsMember

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