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Fair Value Measurements (Narrative) (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | $ (12,000,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements | $ 59,000,000 us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements |
Net assets measured at fair value on a recurring basis | 3,100,000,000 pseg_NetAssetsMeasuredAtFairValueOnRecurringBasis |  | 2,500,000,000 pseg_NetAssetsMeasuredAtFairValueOnRecurringBasis
Net assets measured at fair value on a recurring basis measured using unobservable input and as Level 3 | 9,000,000 pseg_NetAssetsMeasuredAtFairValueOnRecurringBasisMeasuredUsingUnobservableInputAndClassifiedAsLevel3 |  | 1,000,000 pseg_NetAssetsMeasuredAtFairValueOnRecurringBasisMeasuredUsingUnobservableInputAndClassifiedAsLevel3
Power [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) | (9,000,000)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / dei_LegalEntityAxis = pseg_PowerMember | (5,000,000)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss / dei_LegalEntityAxis = pseg_PowerMember |
Fair Value Assets And Liabilities Measured On Recurring Basis Gain Loss Included In Trading Revenue | $ 3,000,000 pseg_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInTradingRevenue / dei_LegalEntityAxis = pseg_PowerMember | $ (64,000,000)pseg_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisGainLossIncludedInTradingRevenue / dei_LegalEntityAxis = pseg_PowerMember |

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