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Available-For-Sale Securities (Schedule Of Accounts Receivable And Accounts Payable) (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Nuclear Decommissioning Trust (NDT) Fund [Member] | Power [Member]    
Accounts Receivable $ 11us-gaap_AccountsReceivableNet
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_NuclearDecommissioningTrustNdtFundsMember
/ dei_LegalEntityAxis
= pseg_PowerMember		 $ 10us-gaap_AccountsReceivableNet
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_NuclearDecommissioningTrustNdtFundsMember
/ dei_LegalEntityAxis
= pseg_PowerMember
Accounts Payable (7)us-gaap_AccountsPayableCurrentAndNoncurrent
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_NuclearDecommissioningTrustNdtFundsMember
/ dei_LegalEntityAxis
= pseg_PowerMember		 (2)us-gaap_AccountsPayableCurrentAndNoncurrent
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_NuclearDecommissioningTrustNdtFundsMember
/ dei_LegalEntityAxis
= pseg_PowerMember
Rabbi Trust [Member]    
Accounts Receivable 1us-gaap_AccountsReceivableNet
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_RabbiTrustMember		 1us-gaap_AccountsReceivableNet
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_RabbiTrustMember
Accounts Payable $ (1)us-gaap_AccountsPayableCurrentAndNoncurrent
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_RabbiTrustMember		 $ 0us-gaap_AccountsPayableCurrentAndNoncurrent
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_RabbiTrustMember