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Commitments And Contingent Liabilities (Regulatory Proceedings and Superstorm Sandy) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 39 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2012 | Dec. 31, 2013 | Mar. 31, 2015 | Apr. 30, 2015
Loss Contingencies [Line Items] |  |  |  |  |  |
Operation and Maintenance | $ (663)us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations | $ (856)us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations |  |  |  |
New Jersey Clean Energy Program Unfavorable Regulatory Action [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Aggregate funding for New Jersey Clean Energy Program | 345 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_NewJerseyCleanEnergyProgramUnfavorableRegulatoryActionMember |  |  |  | 345 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_NewJerseyCleanEnergyProgramUnfavorableRegulatoryActionMember |
Superstorm Sandy [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Proceeds from Insurance Recoveries | 159 pseg_ProceedsFromInsuranceRecoveries / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_SuperstormSandyMember |  |  |  |  |
PSE And G [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Operation and Maintenance | (412)us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = pseg_PseAndGMember | (462)us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = pseg_PseAndGMember |  |  |  |
PSE And G [Member] | New Jersey Clean Energy Program Unfavorable Regulatory Action [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Aggregate funding for New Jersey Clean Energy Program | 200 us-gaap_LossContingencyEstimateOfPossibleLoss / dei_LegalEntityAxis = pseg_PseAndGMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_NewJerseyCleanEnergyProgramUnfavorableRegulatoryActionMember |  |  |  | 200 us-gaap_LossContingencyEstimateOfPossibleLoss / dei_LegalEntityAxis = pseg_PseAndGMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_NewJerseyCleanEnergyProgramUnfavorableRegulatoryActionMember |
Discounted liability recorded-current | 86 us-gaap_LossContingencyAccrualCarryingValueCurrent / dei_LegalEntityAxis = pseg_PseAndGMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_NewJerseyCleanEnergyProgramUnfavorableRegulatoryActionMember |  |  |  | 86 us-gaap_LossContingencyAccrualCarryingValueCurrent / dei_LegalEntityAxis = pseg_PseAndGMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_NewJerseyCleanEnergyProgramUnfavorableRegulatoryActionMember |
PSE And G [Member] | Superstorm Sandy [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Utilities, Costs Incurred to Repair Infrastructure to Pre-Storm Conditions |  |  | 5 pseg_UtilitiesCostsIncurredtoRepairInfrastructuretoPreStormConditions / dei_LegalEntityAxis = pseg_PseAndGMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_SuperstormSandyMember |  |  |
Utilities, Costs Incurred to Restore Service portion attributable to insured property |  |  | 36 pseg_UtilitiesCostsIncurredtoRestoreServiceportionattributabletoinsuredproperty / dei_LegalEntityAxis = pseg_PseAndGMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_SuperstormSandyMember |  |  |
Utilities, Costs Incurred to Restore Service |  |  | 295 pseg_UtilitiesCostsIncurredToRestoreService / dei_LegalEntityAxis = pseg_PseAndGMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_SuperstormSandyMember |  |  |
Operation and Maintenance | 15 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = pseg_PseAndGMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_SuperstormSandyMember |  | (40)us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = pseg_PseAndGMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_SuperstormSandyMember |  |  |
Proceeds from Insurance Recoveries | 26 pseg_ProceedsFromInsuranceRecoveries / dei_LegalEntityAxis = pseg_PseAndGMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_SuperstormSandyMember |  | 6 pseg_ProceedsFromInsuranceRecoveries / dei_LegalEntityAxis = pseg_PseAndGMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_SuperstormSandyMember |  |  |
Public Utilities, Property, Plant and Equipment, Addition from Service Restore | 9 pseg_PublicUtilitiesPropertyPlantAndEquipmentAdditionFromServiceRestore / dei_LegalEntityAxis = pseg_PseAndGMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_SuperstormSandyMember |  | (75)pseg_PublicUtilitiesPropertyPlantAndEquipmentAdditionFromServiceRestore / dei_LegalEntityAxis = pseg_PseAndGMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_SuperstormSandyMember |  |  |
Regulatory Assets, Addition for Service Restore | 8 pseg_RegulatoryAssetsAdditionForServiceRestore / dei_LegalEntityAxis = pseg_PseAndGMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_SuperstormSandyMember |  | (180)pseg_RegulatoryAssetsAdditionForServiceRestore / dei_LegalEntityAxis = pseg_PseAndGMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_SuperstormSandyMember |  |  |
Power [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Operation and Maintenance | (172)us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = pseg_PowerMember | (302)us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = pseg_PowerMember |  |  |  |
Power [Member] | FERC Compliance [Domain] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss Contingency related to bidding errors |  | 25 us-gaap_LossContingencyLossInPeriod / dei_LegalEntityAxis = pseg_PowerMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_RegulatoryAgencyDomain |  |  |  |
Power [Member] | Superstorm Sandy [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Operation and Maintenance | 128 us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = pseg_PowerMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_SuperstormSandyMember |  |  |  | (194)us-gaap_UtilitiesOperatingExpenseMaintenanceAndOperations / dei_LegalEntityAxis = pseg_PowerMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_SuperstormSandyMember |
Proceeds from Insurance Recoveries | 133 pseg_ProceedsFromInsuranceRecoveries / dei_LegalEntityAxis = pseg_PowerMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_SuperstormSandyMember |  |  | 44 pseg_ProceedsFromInsuranceRecoveries / dei_LegalEntityAxis = pseg_PowerMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_SuperstormSandyMember |  |
Public Utilities, Property, Plant and Equipment, Addition from Service Restore | 5 pseg_PublicUtilitiesPropertyPlantAndEquipmentAdditionFromServiceRestore / dei_LegalEntityAxis = pseg_PowerMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_SuperstormSandyMember |  |  |  |  |
Subsequent Event [Member] | Superstorm Sandy [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Proceeds from Insurance Recoveries |  |  |  |  |  | $ 54 pseg_ProceedsFromInsuranceRecoveries / us-gaap_LossContingenciesByNatureOfContingencyAxis = pseg_SuperstormSandyMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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