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Financing Receivables (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Lease investment with non-investment grade counterparties, gross $ 573pseg_LeaseInvestmentWithNonInvestmentGradeCounterpartiesGross
Lease investment with non-investment grade counterparties, net of deferred taxes $ (9)pseg_LeaseInvestmentWithNonInvestmentGradeCounterpartiesNetOfDeferredTaxes
Powerton Station [Member]  
Lease Receivable Percent Owned 64.00%pseg_LeaseReceivablePercentOwned
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= pseg_PowertonStationMember