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Commitments And Contingent Liabilities (Environmental Matters) (Detail) (USD $) | 3 Months Ended | 1 Months Ended |  |  |
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Mar. 31, 2015 Potentially_Responsible_Party site | Jun. 30, 2008 | Dec. 31, 2014 | Dec. 31, 2006 | Mar. 31, 2007 Potentially_Responsible_Party
Site Contingency [Line Items] |  |  |  |  |
Number of miles related to the Passaic River constituting a facility as determined by the US Environmental Protection Agency | 17 pseg_NumberOfMilesPertainingToPassaicRiverFacilityAsDeterminedByEpa |  |  |  |
Number of miles on Passaic River tidal reach required to be studied as determined by the US Environmental Protection Agency | 8 pseg_NumberOfMilesPertainingToPassaicRiverTidalReachRequiredToBeStudiedByEpa |  |  |  |
Number of additional legal entities contacted by EPA in conjunction with Newark Bay study area contamination | 11 pseg_NumberOfAdditionalLegalEntitiesContactedByEpaInConjunctionWithNewarkBayStudyAreaContamination |  |  |  |
Number of operating electric generating stations located on Hackensack River | 2 pseg_NumberOfOperatingElectricGeneratingStationsLocatedOnHackensackRiverInConjunctionWithNewarkBayStudyAreaContamination |  |  |  |
Number of former MGP contamination sites located on Hackensack river in conjunction with Newark Bay study area contamination | 1 pseg_NumberOfFormerMgpContaminationSitesLocatedOnHackensackRiverInConjunctionWithNewarkBayStudyAreaContamination |  |  |  |
Accrued environmental costs | $ 427,000,000 us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent |  | $ 417,000,000 us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent |  |
New Salem facility cooling towers estimated cost total | 1,000,000,000 pseg_NewSalemFacilityCoolingTowersEstimatedCostTotal |  |  |  |
PSE And G [Member] |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |
Percentage of cost attributable to potentially responsible party |  |  |  | 7.00%pseg_PercentageOfCostAttributableToPotentiallyResponsibleParty / dei_LegalEntityAxis = pseg_PseAndGMember |
Accrued environmental costs | 375,000,000 us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent / dei_LegalEntityAxis = pseg_PseAndGMember |  | 364,000,000 us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent / dei_LegalEntityAxis = pseg_PseAndGMember |  |
Power [Member] |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |
Ownership percentage of Keystone Coal fired plant in Pennsylvania | 23.00%pseg_OwnershipPercentageOfKeystoneCoalFiredPlantInPennsylvania / dei_LegalEntityAxis = pseg_PowerMember |  |  |  |
New Salem facility cooling towers estimated cost total | 575,000,000 pseg_NewSalemFacilityCoolingTowersEstimatedCostTotal / dei_LegalEntityAxis = pseg_PowerMember |  |  |  |
Psd Nsr Regulations Site Contingency [Member] | Power [Member] |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |
Penalty per day from date of violation-minimum | 25,000 pseg_PenaltyPerDayFromDateOfViolationMinimum / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PsdNsrRegulationsSiteContingencyMember / dei_LegalEntityAxis = pseg_PowerMember |  |  |  |
Penalty per day from date of violation-maximum | 37,500 pseg_PenaltyPerDayFromDateOfViolationMaximum / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PsdNsrRegulationsSiteContingencyMember / dei_LegalEntityAxis = pseg_PowerMember |  |  |  |
Pse G S Former Mgp Sites [Member] |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |
Number of potentially responsible parties ("PRPs") in connection with environmental liabilities for operations conducted near Passaic River | 61 pseg_NumberOfPotentiallyResponsiblePartiesInConnectionWithEnvironmentalLiabilitiesForOperationsConductedNearPassaicRiver / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PseGSFormerMgpSitesMember |  |  |  | 73 pseg_NumberOfPotentiallyResponsiblePartiesInConnectionWithEnvironmentalLiabilitiesForOperationsConductedNearPassaicRiver / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PseGSFormerMgpSitesMember
Estimated, total cost of the study | 148,000,000 pseg_EstimatedTotalCostOfStudyHighEndofRange / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PseGSFormerMgpSitesMember |  |  |  |
Total Spend of Study to date | 130,000,000 pseg_TotalSpendofStudytodate / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PseGSFormerMgpSitesMember |  |  |  |
Company Share of Total Spend of Study to date | 9,000,000 pseg_CompanyShareofTotalSpendofStudytodate / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PseGSFormerMgpSitesMember |  |  |  |
Number of MGP sites identified by registrant and the NJDEP requiring some level of remedial action | 38 pseg_AggregateNumberOfMgpSitesIdentifiedForCleanupByNewJerseyDepartmentOfEnvironmentalProtection / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PseGSFormerMgpSitesMember |  |  |  |
Pse G S Former Mgp Sites [Member] | Power [Member] |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |
Percentage of cost attributable to potentially responsible party |  |  |  | 1.00%pseg_PercentageOfCostAttributableToPotentiallyResponsibleParty / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PseGSFormerMgpSitesMember / dei_LegalEntityAxis = pseg_PowerMember |
Passaic River Site Contingency [Member] |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |
Estimated cleanup costs-low estimate | 365,000,000 pseg_EstimatedCleanupCostsLowEstimate / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PassaicRiverSiteContingencyMember |  |  |  |
Estimated cleanup costs-high estimate | 3,250,000,000 pseg_EstimatedCleanupCostsHighEstimate / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PassaicRiverSiteContingencyMember |  |  |  |
Estimated Cleanup Costs EPA Preferred Method | 1,700,000,000 pseg_EstimatedCleanupCostsEPAPreferredMethod / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PassaicRiverSiteContingencyMember |  |  |  |
CPG Estimated Cleanup Costs Low Estimate | 518,000,000 pseg_CPGEstimatedCleanupCostsLowEstimate / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PassaicRiverSiteContingencyMember |  |  |  |
CPG Estimated Cleanup Costs High Estimate | 3,200,000,000 pseg_CPGEstimatedCleanupCostsHighEstimate / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PassaicRiverSiteContingencyMember |  |  |  |
CPG Targeted Method Cleanup Costs Low Estimate | 518,000,000 pseg_CPGTargetedMethodCleanupCostsLowEstimate / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PassaicRiverSiteContingencyMember |  |  |  |
CPG Targeted Remedy Cleanup Costs High Estimate | 772,000,000 pseg_CPGTargetedRemedyCleanupCostsHighEstimate / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PassaicRiverSiteContingencyMember |  |  |  |
Estimated cleanup costs agreed to by two potentially responsible parties |  | 80,000,000 pseg_EstimatedCleanupCostsAgreedToByTwoPotentiallyResponsibleParties / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PassaicRiverSiteContingencyMember |  |  |
Estimated cost of interim natural resource injury restoration | 950,000,000 pseg_EstimatedCostOfInterimNaturalResourceInjuryRestoration / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PassaicRiverSiteContingencyMember |  |  |  |
Passaic River Site Contingency [Member] | PSE And G [Member] |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |
Number of former generating electric station | 1 pseg_NumberOfFormerGeneratingElectricStation / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PassaicRiverSiteContingencyMember / dei_LegalEntityAxis = pseg_PseAndGMember |  |  |  |
Number of former Manufactured Gas Plant (MGP) sites | 4 pseg_NumberOfFormerManufacturedGasPlantMgpSites / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PassaicRiverSiteContingencyMember / dei_LegalEntityAxis = pseg_PseAndGMember |  |  |  |
CPG Targeted Method Cleanup Costs Low Estimate | 10,000,000 pseg_CPGTargetedMethodCleanupCostsLowEstimate / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PassaicRiverSiteContingencyMember / dei_LegalEntityAxis = pseg_PseAndGMember |  |  |  |
Passaic River Site Contingency [Member] | Power [Member] |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |
CPG Targeted Method Cleanup Costs Low Estimate | 3,000,000 pseg_CPGTargetedMethodCleanupCostsLowEstimate / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PassaicRiverSiteContingencyMember / dei_LegalEntityAxis = pseg_PowerMember |  |  |  |
Remedial Investigation And Feasibility Study [Member] |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |
Estimated, total cost of the study | 30,000,000 pseg_EstimatedTotalCostOfStudyHighEndofRange / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_RemedialInvestigationAndFeasibilityStudyMember |  |  |  |
Estimated Total Cost Of Study Low End of Range | 25,000,000 pseg_EstimatedTotalCostOfStudyLowEndofRange / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_RemedialInvestigationAndFeasibilityStudyMember |  |  |  |
MGP Remediation Site Contingency [Member] | PSE And G [Member] |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |
Estimated expenditures, low end of range | 452,000,000 pseg_EstimatedExpendituresLowEndOfRange / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_MgpRemediationSiteContingencyMember / dei_LegalEntityAxis = pseg_PseAndGMember |  |  |  |
Estimated expenditures, high end of range | 523,000,000 pseg_EstimatedExpendituresHighEndOfRange / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_MgpRemediationSiteContingencyMember / dei_LegalEntityAxis = pseg_PseAndGMember |  |  |  |
Accrued environmental costs | 452,000,000 us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_MgpRemediationSiteContingencyMember / dei_LegalEntityAxis = pseg_PseAndGMember |  |  |  |
Remediation liability recorded as other current liabilities | 86,000,000 pseg_RemediationLiabilityRecordedAsOtherCurrentLiabilities / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_MgpRemediationSiteContingencyMember / dei_LegalEntityAxis = pseg_PseAndGMember |  |  |  |
Remediation liability recorded as environmental costs in noncurrent liabilities | 366,000,000 pseg_RemediationLiabilityRecordedAsOtherNoncurrentLiabilities / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_MgpRemediationSiteContingencyMember / dei_LegalEntityAxis = pseg_PseAndGMember |  |  |  |
Regulatory assets | $ 452,000,000 us-gaap_RegulatoryAssets / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_MgpRemediationSiteContingencyMember / dei_LegalEntityAxis = pseg_PseAndGMember |  |  |  |
Passaic River mile 10.9 contaminant removal [Member] |  |  |  |  |
Site Contingency [Line Items] |  |  |  |  |
Percentage of cost attributable to potentially responsible party | 3.00%pseg_PercentageOfCostAttributableToPotentiallyResponsibleParty / us-gaap_EnvironmentalRemediationContingencyAxis = pseg_PassaicRivermile10.9contaminantremovalMember |  |  |  |

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