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Available-For-Sale Securities (Amount Of Available-For-Sale Debt Securities By Maturity Periods) (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015
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Rabbi Trust [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale debt securities, Less than one year | $ 0 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember
Available-for-sale debt securities, 1-5 years | 62 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember
Available-for-sale debt securities, 6-10 years | 35 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember
Available-for-sale debt securities, 11-15 years | 9 pseg_AvailableForSaleSecuritiesDebtMaturitiesAfterTenThroughFifteenYearsFairValue / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember
Available-for-sale debt securities, 16-20 years | 7 pseg_AvailableForSaleSecuritiesDebtMaturitiesAfterFifteenThroughTwentyYearsFairValue / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember
Available-for-sale debt securities, Over 20 years | 76 pseg_AvailableForSaleSecuritiesDebtMaturitiesAfterTwentyYearsFairValue / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember
Total Available-for-Sale Debt Securities | 189 us-gaap_AvailableForSaleSecuritiesDebtSecurities / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale debt securities, Less than one year | 5 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember
Available-for-sale debt securities, 1-5 years | 242 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember
Available-for-sale debt securities, 6-10 years | 193 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember
Available-for-sale debt securities, 11-15 years | 61 pseg_AvailableForSaleSecuritiesDebtMaturitiesAfterTenThroughFifteenYearsFairValue / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember
Available-for-sale debt securities, 16-20 years | 45 pseg_AvailableForSaleSecuritiesDebtMaturitiesAfterFifteenThroughTwentyYearsFairValue / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember
Available-for-sale debt securities, Over 20 years | 321 pseg_AvailableForSaleSecuritiesDebtMaturitiesAfterTwentyYearsFairValue / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember
Total Available-for-Sale Debt Securities | $ 867 us-gaap_AvailableForSaleSecuritiesDebtSecurities / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember

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