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Fair Value Measurements (Schedule Of Quantitative Information About Level 3 Fair Value Measurements) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value | $ 3 us-gaap_AssetsFairValueDisclosure / dei_LegalEntityAxis = pseg_PowerMember |  | $ 12 us-gaap_AssetsFairValueDisclosure / dei_LegalEntityAxis = pseg_PowerMember |
Liabilities, Fair Value | (1)us-gaap_LiabilitiesFairValueDisclosure / dei_LegalEntityAxis = pseg_PowerMember |  | (1)us-gaap_LiabilitiesFairValueDisclosure / dei_LegalEntityAxis = pseg_PowerMember |
PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value | 7 us-gaap_AssetsFairValueDisclosure / dei_LegalEntityAxis = pseg_PseAndGMember |  | 26 us-gaap_AssetsFairValueDisclosure / dei_LegalEntityAxis = pseg_PseAndGMember |
Liabilities, Fair Value | 0 us-gaap_LiabilitiesFairValueDisclosure / dei_LegalEntityAxis = pseg_PseAndGMember |  | 0 us-gaap_LiabilitiesFairValueDisclosure / dei_LegalEntityAxis = pseg_PseAndGMember |
PSEG [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value | 10 us-gaap_AssetsFairValueDisclosure / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 38 us-gaap_AssetsFairValueDisclosure / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Liabilities, Fair Value | (1)us-gaap_LiabilitiesFairValueDisclosure / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (1)us-gaap_LiabilitiesFairValueDisclosure / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Various [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value | 0 us-gaap_AssetsFairValueDisclosure / us-gaap_DerivativeByNatureAxis = pseg_VariousMember / dei_LegalEntityAxis = pseg_PowerMember | [1] | 0 us-gaap_AssetsFairValueDisclosure / us-gaap_DerivativeByNatureAxis = pseg_VariousMember / dei_LegalEntityAxis = pseg_PowerMember | [2]
Liabilities, Fair Value | 0 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_DerivativeByNatureAxis = pseg_VariousMember / dei_LegalEntityAxis = pseg_PowerMember | [1] | 0 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_DerivativeByNatureAxis = pseg_VariousMember / dei_LegalEntityAxis = pseg_PowerMember | [2]
Electric Load Contracts [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value | 3 us-gaap_AssetsFairValueDisclosure / us-gaap_DerivativeByNatureAxis = pseg_ElectricLoadDealsMember / dei_LegalEntityAxis = pseg_PowerMember |  | 12 us-gaap_AssetsFairValueDisclosure / us-gaap_DerivativeByNatureAxis = pseg_ElectricLoadDealsMember / dei_LegalEntityAxis = pseg_PowerMember |
Liabilities, Fair Value | (1)us-gaap_LiabilitiesFairValueDisclosure / us-gaap_DerivativeByNatureAxis = pseg_ElectricLoadDealsMember / dei_LegalEntityAxis = pseg_PowerMember |  | (1)us-gaap_LiabilitiesFairValueDisclosure / us-gaap_DerivativeByNatureAxis = pseg_ElectricLoadDealsMember / dei_LegalEntityAxis = pseg_PowerMember |
Valuation Technique (s) | Discounted Cash flow |  | Discounted Cash Flow |
Significant Unobservable Inputs | Historic Load Variability |  | Historic Load Variability |
Electric Load Contracts [Member] | Minimum [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Historic Load Variability | 10.00%pseg_HistoricLoadVariability / us-gaap_DerivativeByNatureAxis = pseg_ElectricLoadDealsMember / dei_LegalEntityAxis = pseg_PowerMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  | 10.00%pseg_HistoricLoadVariability / us-gaap_DerivativeByNatureAxis = pseg_ElectricLoadDealsMember / dei_LegalEntityAxis = pseg_PowerMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Electric Load Contracts [Member] | Maximum [Member] | Power [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Historic Load Variability | 0.00%pseg_HistoricLoadVariability / us-gaap_DerivativeByNatureAxis = pseg_ElectricLoadDealsMember / dei_LegalEntityAxis = pseg_PowerMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 0.00%pseg_HistoricLoadVariability / us-gaap_DerivativeByNatureAxis = pseg_ElectricLoadDealsMember / dei_LegalEntityAxis = pseg_PowerMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Forward Contracts [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value | 7 us-gaap_AssetsFairValueDisclosure / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / dei_LegalEntityAxis = pseg_PseAndGMember |  | 26 us-gaap_AssetsFairValueDisclosure / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / dei_LegalEntityAxis = pseg_PseAndGMember |
Liabilities, Fair Value | $ 0 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / dei_LegalEntityAxis = pseg_PseAndGMember |  | $ 0 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / dei_LegalEntityAxis = pseg_PseAndGMember |
Valuation Technique (s) | Discounted Cash Flow |  | Discounted Cash Flow |
Significant Unobservable Inputs | Transportation Costs |  | Transportation Costs |
Forward Contracts [Member] | Minimum [Member] | MWh [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Transportation Costs | 0.70 pseg_TransportationCosts / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / dei_LegalEntityAxis = pseg_PseAndGMember / pseg_MeasurementUnitsAxis = pseg_MegawattHoursMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  | 0.70 pseg_TransportationCosts / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / dei_LegalEntityAxis = pseg_PseAndGMember / pseg_MeasurementUnitsAxis = pseg_MegawattHoursMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Forward Contracts [Member] | Maximum [Member] | MWh [Member] | PSE And G [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Transportation Costs | 1 pseg_TransportationCosts / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / dei_LegalEntityAxis = pseg_PseAndGMember / pseg_MeasurementUnitsAxis = pseg_MegawattHoursMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 1 pseg_TransportationCosts / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / dei_LegalEntityAxis = pseg_PseAndGMember / pseg_MeasurementUnitsAxis = pseg_MegawattHoursMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
[1] | Includes long-term electric positions which were immaterial as of March 31, 2015.
[2] | Includes gas supply positions and long-term electric capacity positions which were immaterial as of December 31, 2014.

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