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Available-For-Sale Securities (Fair Value Of Rabbi Trust) (Detail) (Rabbi Trust [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Total Rabbi Trust Available-for-Sale Securities $ 214us-gaap_AvailableForSaleSecurities $ 191us-gaap_AvailableForSaleSecurities
Power [Member]
    
Total Rabbi Trust Available-for-Sale Securities 53us-gaap_AvailableForSaleSecurities
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_RabbiTrustMember
/ dei_LegalEntityAxis
= pseg_PowerMember		 45us-gaap_AvailableForSaleSecurities
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_RabbiTrustMember
/ dei_LegalEntityAxis
= pseg_PowerMember
PSE And G [Member]
    
Total Rabbi Trust Available-for-Sale Securities 42us-gaap_AvailableForSaleSecurities
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_RabbiTrustMember
/ dei_LegalEntityAxis
= pseg_PseAndGMember		 41us-gaap_AvailableForSaleSecurities
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_RabbiTrustMember
/ dei_LegalEntityAxis
= pseg_PseAndGMember
Other Entity [Member]
    
Total Rabbi Trust Available-for-Sale Securities $ 119us-gaap_AvailableForSaleSecurities
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_RabbiTrustMember
/ dei_LegalEntityAxis
= pseg_OtherEntityMember		 $ 105us-gaap_AvailableForSaleSecurities
/ pseg_AvailableForSaleSecuritiesTypeOfTrustAxis
= pseg_RabbiTrustMember
/ dei_LegalEntityAxis
= pseg_OtherEntityMember