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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
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Power [Member] |  |
Fair Value of Cash Flow Hedges | $ 2 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue / dei_LegalEntityAxis = pseg_PowerMember | $ 18 us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue / dei_LegalEntityAxis = pseg_PowerMember
Impact on Accumulated Other Comprehensive Income (Loss) (after tax) | $ 1 us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax / dei_LegalEntityAxis = pseg_PowerMember | $ 10 us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax / dei_LegalEntityAxis = pseg_PowerMember

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant