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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
Dec. 31, 2014
Rabbi Trust [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale debt securities, Less than one year $ 0us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_RabbiTrustMember
Available-for-sale debt securities, 1-5 years 49us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_RabbiTrustMember
Available-for-sale debt securities, 6-10 years 31us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_RabbiTrustMember
Available-for-sale debt securities, 11-15 years 9pseg_AvailableForSaleSecuritiesDebtMaturitiesAfterTenThroughFifteenYearsFairValue
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_RabbiTrustMember
Available-for-sale debt securities, 16-20 years 7pseg_AvailableForSaleSecuritiesDebtMaturitiesAfterFifteenThroughTwentyYearsFairValue
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_RabbiTrustMember
Available-for-sale debt securities, Over 20 years 70pseg_AvailableForSaleSecuritiesDebtMaturitiesAfterTwentyYearsFairValue
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_RabbiTrustMember
Total Available-for-Sale Debt Securities 166us-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 10us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_NuclearDecommissioningTrustNdtFundsMember
/ dei_LegalEntityAxis
= pseg_PowerMember
Available-for-sale debt securities, 1-5 years 271us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_NuclearDecommissioningTrustNdtFundsMember
/ dei_LegalEntityAxis
= pseg_PowerMember
Available-for-sale debt securities, 6-10 years 179us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_NuclearDecommissioningTrustNdtFundsMember
/ dei_LegalEntityAxis
= pseg_PowerMember
Available-for-sale debt securities, 11-15 years 54pseg_AvailableForSaleSecuritiesDebtMaturitiesAfterTenThroughFifteenYearsFairValue
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_NuclearDecommissioningTrustNdtFundsMember
/ dei_LegalEntityAxis
= pseg_PowerMember
Available-for-sale debt securities, 16-20 years 49pseg_AvailableForSaleSecuritiesDebtMaturitiesAfterFifteenThroughTwentyYearsFairValue
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_NuclearDecommissioningTrustNdtFundsMember
/ dei_LegalEntityAxis
= pseg_PowerMember
Available-for-sale debt securities, Over 20 years 214pseg_AvailableForSaleSecuritiesDebtMaturitiesAfterTwentyYearsFairValue
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_NuclearDecommissioningTrustNdtFundsMember
/ dei_LegalEntityAxis
= pseg_PowerMember
Total Available-for-Sale Debt Securities $ 777us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_NuclearDecommissioningTrustNdtFundsMember
/ dei_LegalEntityAxis
= pseg_PowerMember