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Long-Term Investments (Equity Method Investments) (Details)
 12 Months Ended
Dec. 31, 2014
Keystone [Member]  
Long-Term Investments [Line Items]  
Location of the affiliated companies, equity method investments PA
Owned percentage 23.00%pseg_InvestmentsOwnedPercentOfNetassets
/ us-gaap_PublicUtilityAxis
= pseg_KeystoneMember
Conemaugh [Member]  
Long-Term Investments [Line Items]  
Location of the affiliated companies, equity method investments PA
Owned percentage 23.00%pseg_InvestmentsOwnedPercentOfNetassets
/ us-gaap_PublicUtilityAxis
= pseg_ConemaughMember
Kalaeloa [Member]  
Long-Term Investments [Line Items]  
Location of the affiliated companies, equity method investments HI
Owned percentage 50.00%pseg_InvestmentsOwnedPercentOfNetassets
/ us-gaap_PublicUtilityAxis
= pseg_KalaeloaMember
Gwf Energy Llc [Member]  
Long-Term Investments [Line Items]  
Location of the affiliated companies, equity method investments CA
Owned percentage 50.00%pseg_InvestmentsOwnedPercentOfNetassets
/ us-gaap_PublicUtilityAxis
= pseg_GwfEnergyLlcMember
Hanford L. P. (Hanford) [Member]  
Long-Term Investments [Line Items]  
Location of the affiliated companies, equity method investments CA
Owned percentage 50.00%pseg_InvestmentsOwnedPercentOfNetassets
/ us-gaap_PublicUtilityAxis
= pseg_HanfordLimitedPartnershipMember