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Financial Risk Management Activities (Schedule Of Derivative Transactions Designated And Effective As Cash Flow Hedges) (Detail) (Power [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Power [Member]
    
Fair Value of Cash Flow Hedges $ 2us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue
/ dei_LegalEntityAxis
= pseg_PowerMember		 $ 18us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue
/ dei_LegalEntityAxis
= pseg_PowerMember
Impact on Accumulated Other Comprehensive Income (Loss) (after tax) $ 1us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ dei_LegalEntityAxis
= pseg_PowerMember		 $ 10us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ dei_LegalEntityAxis
= pseg_PowerMember