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Financing Receivables (Gross And Net Lease Investment) (Detail) (Energy Holdings [Member], USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Energy Holdings [Member] |  |
Lease Receivables (net of Non-Recourse Debt) | $ 663 us-gaap_LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureRentalReceivablesNet / dei_LegalEntityAxis = pseg_EnergyHoldingsMember | $ 691 us-gaap_LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureRentalReceivablesNet / dei_LegalEntityAxis = pseg_EnergyHoldingsMember
Estimated Residual Value of Leased Assets | 525 us-gaap_LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureResidualValueOfLeasedAssets / dei_LegalEntityAxis = pseg_EnergyHoldingsMember | 525 us-gaap_LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureResidualValueOfLeasedAssets / dei_LegalEntityAxis = pseg_EnergyHoldingsMember
Unearned and Deferred Income | (377)us-gaap_LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureDeferredIncome / dei_LegalEntityAxis = pseg_EnergyHoldingsMember | (380)us-gaap_LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureDeferredIncome / dei_LegalEntityAxis = pseg_EnergyHoldingsMember
Gross Investments in Leases | 811 pseg_LeveragedLeasesGrossInvestment / dei_LegalEntityAxis = pseg_EnergyHoldingsMember | 836 pseg_LeveragedLeasesGrossInvestment / dei_LegalEntityAxis = pseg_EnergyHoldingsMember
Deferred Tax Liabilities | (717)us-gaap_LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureDeferredTaxesArisingFromLeveragedLeases / dei_LegalEntityAxis = pseg_EnergyHoldingsMember | (738)us-gaap_LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureDeferredTaxesArisingFromLeveragedLeases / dei_LegalEntityAxis = pseg_EnergyHoldingsMember
Net Investments in Leases | $ 94 us-gaap_LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureInvestmentInLeveragedLeasesNet / dei_LegalEntityAxis = pseg_EnergyHoldingsMember | $ 98 us-gaap_LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureInvestmentInLeveragedLeasesNet / dei_LegalEntityAxis = pseg_EnergyHoldingsMember

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