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Financial Risk Management Activities (Schedule Of Derivative Instruments Designated As Cash Flow Hedges) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |
Interest Expense | $ (98)us-gaap_InterestExpense | $ (97)us-gaap_InterestExpense
Operating Revenues | 3,135 us-gaap_Revenues | 3,223 us-gaap_Revenues
PSEG [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) | 1 us-gaap_UnrealizedGainLossOnCashFlowHedgingInstruments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (8)us-gaap_UnrealizedGainLossOnCashFlowHedgingInstruments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) | 0 us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion) | 17 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (12)us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Power [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) | 1 us-gaap_UnrealizedGainLossOnCashFlowHedgingInstruments / dei_LegalEntityAxis = pseg_PowerMember | (8)us-gaap_UnrealizedGainLossOnCashFlowHedgingInstruments / dei_LegalEntityAxis = pseg_PowerMember
Interest Expense | (31)us-gaap_InterestExpense / dei_LegalEntityAxis = pseg_PowerMember | (32)us-gaap_InterestExpense / dei_LegalEntityAxis = pseg_PowerMember
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) | 0 us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet / dei_LegalEntityAxis = pseg_PowerMember | 0 us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet / dei_LegalEntityAxis = pseg_PowerMember
Operating Revenues | 1,725 us-gaap_Revenues / dei_LegalEntityAxis = pseg_PowerMember | 1,700 us-gaap_Revenues / dei_LegalEntityAxis = pseg_PowerMember
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Reclassified from AOCI into Energy Costs (Effective Portion) | 17 us-gaap_ProfitLoss / dei_LegalEntityAxis = pseg_PowerMember | (12)us-gaap_ProfitLoss / dei_LegalEntityAxis = pseg_PowerMember
Operating Revenues [Member] | PSEG [Member] | Energy-Related Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) | 1 us-gaap_UnrealizedGainLossOnCashFlowHedgingInstruments / us-gaap_DerivativeByNatureAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_IncomeStatementLocationAxis = pseg_OperatingRevenuesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (8)us-gaap_UnrealizedGainLossOnCashFlowHedgingInstruments / us-gaap_DerivativeByNatureAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_IncomeStatementLocationAxis = pseg_OperatingRevenuesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) | 0 us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet / us-gaap_DerivativeByNatureAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_IncomeStatementLocationAxis = pseg_OperatingRevenuesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet / us-gaap_DerivativeByNatureAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_IncomeStatementLocationAxis = pseg_OperatingRevenuesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating Revenues | 17 us-gaap_Revenues / us-gaap_DerivativeByNatureAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_IncomeStatementLocationAxis = pseg_OperatingRevenuesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (12)us-gaap_Revenues / us-gaap_DerivativeByNatureAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_IncomeStatementLocationAxis = pseg_OperatingRevenuesMember / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating Revenues [Member] | Power [Member] | Energy-Related Contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Amount of Pre-Tax Gain (Loss) attributed to Cash Flow Hedges Recognized in AOCI on Derivatives (Effective Portion) | 1 us-gaap_UnrealizedGainLossOnCashFlowHedgingInstruments / us-gaap_DerivativeByNatureAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_IncomeStatementLocationAxis = pseg_OperatingRevenuesMember / dei_LegalEntityAxis = pseg_PowerMember | (8)us-gaap_UnrealizedGainLossOnCashFlowHedgingInstruments / us-gaap_DerivativeByNatureAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_IncomeStatementLocationAxis = pseg_OperatingRevenuesMember / dei_LegalEntityAxis = pseg_PowerMember
Amount of Pre-Tax Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion) | 0 us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet / us-gaap_DerivativeByNatureAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_IncomeStatementLocationAxis = pseg_OperatingRevenuesMember / dei_LegalEntityAxis = pseg_PowerMember | 0 us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet / us-gaap_DerivativeByNatureAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_IncomeStatementLocationAxis = pseg_OperatingRevenuesMember / dei_LegalEntityAxis = pseg_PowerMember
Operating Revenues | $ 17 us-gaap_Revenues / us-gaap_DerivativeByNatureAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_IncomeStatementLocationAxis = pseg_OperatingRevenuesMember / dei_LegalEntityAxis = pseg_PowerMember | $ (12)us-gaap_Revenues / us-gaap_DerivativeByNatureAxis = us-gaap_EnergyRelatedDerivativeMember / us-gaap_IncomeStatementLocationAxis = pseg_OperatingRevenuesMember / dei_LegalEntityAxis = pseg_PowerMember

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