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Available-For-Sale Securities (Proceeds From The Sales Of And The Net Realized Gains On Securities in the NDT and Rabbi Trusts) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Rabbi Trust [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Proceeds from Sales | $ 19 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember | [1] | $ 12 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember | [1]
Gross Realized Gains | 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember |  | 2 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember |
Gross Realized Losses | 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember |  | 0 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember |
Net Realized Gains (Losses) | 0 us-gaap_RealizedInvestmentGainsLosses / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember |  | 2 us-gaap_RealizedInvestmentGainsLosses / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_RabbiTrustMember |
Power [Member] | Nuclear Decommissioning Trust (NDT) Fund [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Proceeds from Sales | 590 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember | [1] | 245 us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember | [1]
Gross Realized Gains | 19 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember |  | 23 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember |
Gross Realized Losses | (9)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember |  | (4)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember |
Net Realized Gains (Losses) | $ 10 us-gaap_RealizedInvestmentGainsLosses / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember |  | $ 19 us-gaap_RealizedInvestmentGainsLosses / pseg_AvailableForSaleSecuritiesTypeOfTrustAxis = pseg_NuclearDecommissioningTrustNdtFundsMember / dei_LegalEntityAxis = pseg_PowerMember |
[1] | Includes activity in accounts related to the liquidation of funds being transitioned to new managers

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