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Financing Receivables (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Net Investments in Leases $ 98us-gaap_LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureInvestmentInLeveragedLeasesNet $ 98us-gaap_LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureInvestmentInLeveragedLeasesNet
Lease investment with non-investment grade counterparties, gross 572pseg_LeaseInvestmentWithNonInvestmentGradeCounterpartiesGross  
Lease investment with non-investment grade counterparties, net of deferred taxes (20)pseg_LeaseInvestmentWithNonInvestmentGradeCounterpartiesNetOfDeferredTaxes  
NRG commitment to invest $ 350pseg_NRGcommitmenttoinvest  
Powerton Station [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Lease Receivable Percent Owned 64.00%pseg_LeaseReceivablePercentOwned
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= pseg_PowertonStationMember