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Fair Value Measurements (Schedule Of Quantitative Information About Level 3 Fair Value Measurements) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
PSEG [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure $ 38us-gaap_AssetsFairValueDisclosure
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 $ 98us-gaap_AssetsFairValueDisclosure
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Financial and Nonfinancial Liabilities, Fair Value Disclosure 1us-gaap_LiabilitiesFairValueDisclosure
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		 10us-gaap_LiabilitiesFairValueDisclosure
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Power [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure 12us-gaap_AssetsFairValueDisclosure
/ dei_LegalEntityAxis
= pseg_PowerMember		 4us-gaap_AssetsFairValueDisclosure
/ dei_LegalEntityAxis
= pseg_PowerMember
Financial and Nonfinancial Liabilities, Fair Value Disclosure 1us-gaap_LiabilitiesFairValueDisclosure
/ dei_LegalEntityAxis
= pseg_PowerMember		 10us-gaap_LiabilitiesFairValueDisclosure
/ dei_LegalEntityAxis
= pseg_PowerMember
PSE&G [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure 26us-gaap_AssetsFairValueDisclosure
/ dei_LegalEntityAxis
= pseg_PseAndGMember		 94us-gaap_AssetsFairValueDisclosure
/ dei_LegalEntityAxis
= pseg_PseAndGMember
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0us-gaap_LiabilitiesFairValueDisclosure
/ dei_LegalEntityAxis
= pseg_PseAndGMember		 0us-gaap_LiabilitiesFairValueDisclosure
/ dei_LegalEntityAxis
= pseg_PseAndGMember
Forward Contracts [Member] | PSE&G [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure 26us-gaap_AssetsFairValueDisclosure
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ dei_LegalEntityAxis
= pseg_PseAndGMember		 94us-gaap_AssetsFairValueDisclosure
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ dei_LegalEntityAxis
= pseg_PseAndGMember		 [1]
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ dei_LegalEntityAxis
= pseg_PseAndGMember		 0us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ dei_LegalEntityAxis
= pseg_PseAndGMember		 [1]
Fair Value Measurements, Valuation Techniques Discounted Cash Flow Discounted Cash Flow
Fair Value Measurement With Significant Unobservable Inputs Transportation Costs Transportation Costs
Forward Contracts [Member] | Megawatt Hours [Member] | PSE&G [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Transportation Costs 0.70pseg_TransportationCosts
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ dei_LegalEntityAxis
= pseg_PseAndGMember
/ pseg_MeasurementUnitsAxis
= pseg_MegawattHoursMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 0.70pseg_TransportationCosts
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ dei_LegalEntityAxis
= pseg_PseAndGMember
/ pseg_MeasurementUnitsAxis
= pseg_MegawattHoursMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Forward Contracts [Member] | Megawatt Hours [Member] | PSE&G [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Transportation Costs 1pseg_TransportationCosts
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ dei_LegalEntityAxis
= pseg_PseAndGMember
/ pseg_MeasurementUnitsAxis
= pseg_MegawattHoursMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 1pseg_TransportationCosts
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ dei_LegalEntityAxis
= pseg_PseAndGMember
/ pseg_MeasurementUnitsAxis
= pseg_MegawattHoursMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Electric Swaps [Member] | Power [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure   3us-gaap_AssetsFairValueDisclosure
/ us-gaap_DerivativeByNatureAxis
= pseg_ElectricSwapsMember
/ dei_LegalEntityAxis
= pseg_PowerMember
Financial and Nonfinancial Liabilities, Fair Value Disclosure   1us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_DerivativeByNatureAxis
= pseg_ElectricSwapsMember
/ dei_LegalEntityAxis
= pseg_PowerMember
Fair Value Measurements, Valuation Techniques   Discounted Cash Flow
Fair Value Measurement With Significant Unobservable Inputs   Power Basis
Electric Swaps [Member] | Power [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Power Basis Range    0pseg_PowerBasisRange
/ us-gaap_DerivativeByNatureAxis
= pseg_ElectricSwapsMember
/ dei_LegalEntityAxis
= pseg_PowerMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Electric Swaps [Member] | Power [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Power Basis Range    10pseg_PowerBasisRange
/ us-gaap_DerivativeByNatureAxis
= pseg_ElectricSwapsMember
/ dei_LegalEntityAxis
= pseg_PowerMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Electric Load Contracts [Member] | Power [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure 12us-gaap_AssetsFairValueDisclosure
/ us-gaap_DerivativeByNatureAxis
= pseg_ElectricLoadDealsMember
/ dei_LegalEntityAxis
= pseg_PowerMember		 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_DerivativeByNatureAxis
= pseg_ElectricLoadDealsMember
/ dei_LegalEntityAxis
= pseg_PowerMember
Financial and Nonfinancial Liabilities, Fair Value Disclosure 1us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_DerivativeByNatureAxis
= pseg_ElectricLoadDealsMember
/ dei_LegalEntityAxis
= pseg_PowerMember		 8us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_DerivativeByNatureAxis
= pseg_ElectricLoadDealsMember
/ dei_LegalEntityAxis
= pseg_PowerMember
Fair Value Measurements, Valuation Techniques Discounted Cash flow Discounted Cash Flow
Fair Value Measurement With Significant Unobservable Inputs Historic Load Variability Historic Load Variability
Electric Load Contracts [Member] | Power [Member] | Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Historic Load Variability 0.00%pseg_HistoricLoadVariability
/ us-gaap_DerivativeByNatureAxis
= pseg_ElectricLoadDealsMember
/ dei_LegalEntityAxis
= pseg_PowerMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 (5.00%)pseg_HistoricLoadVariability
/ us-gaap_DerivativeByNatureAxis
= pseg_ElectricLoadDealsMember
/ dei_LegalEntityAxis
= pseg_PowerMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Electric Load Contracts [Member] | Power [Member] | Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Historic Load Variability 10.00%pseg_HistoricLoadVariability
/ us-gaap_DerivativeByNatureAxis
= pseg_ElectricLoadDealsMember
/ dei_LegalEntityAxis
= pseg_PowerMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 10.00%pseg_HistoricLoadVariability
/ us-gaap_DerivativeByNatureAxis
= pseg_ElectricLoadDealsMember
/ dei_LegalEntityAxis
= pseg_PowerMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Various [Member] | Power [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets, Fair Value Disclosure 0us-gaap_AssetsFairValueDisclosure
/ us-gaap_DerivativeByNatureAxis
= pseg_VariousMember
/ dei_LegalEntityAxis
= pseg_PowerMember		 [2] 1us-gaap_AssetsFairValueDisclosure
/ us-gaap_DerivativeByNatureAxis
= pseg_VariousMember
/ dei_LegalEntityAxis
= pseg_PowerMember		 [1]
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 0us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_DerivativeByNatureAxis
= pseg_VariousMember
/ dei_LegalEntityAxis
= pseg_PowerMember		 [2] $ 1us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_DerivativeByNatureAxis
= pseg_VariousMember
/ dei_LegalEntityAxis
= pseg_PowerMember		 [1]
[1] Includes gas supply positions which were immaterial as of December 31, 2013.
[2] Includes gas supply positions and long-term electric capacity positions which were immaterial as of December 31, 2014.