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Available-For-Sale Securities (Narrative) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Schedule of Available-for-sale Securities [Line Items] |  |
Other-Than Temporary Impairments | $ 5 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities | $ 2 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities
Power [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Other-Than Temporary Impairments | 5 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / dei_LegalEntityAxis = pseg_PowerMember | 2 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / dei_LegalEntityAxis = pseg_PowerMember
Number of Nuclear Facilities | 5 pseg_NumberofNuclearFacilities / dei_LegalEntityAxis = pseg_PowerMember |
Nuclear Decommissioning Trust (NDT) Fund [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Other-Than Temporary Impairments | 5 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember |
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
After tax amount of net unrealized gains recognized in AOCI | 123 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember |
Rabbi Trust [Member] | Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
After tax amount of net unrealized gains recognized in AOCI | $ 9 us-gaap_OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember |

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