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Pension And OPEB (Narrative) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | $ 15 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember |
Total Benefit Costs | 19 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | (6)us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Postretirement Healthcare Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Employer contributions | 14 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |
Total Benefit Costs | 22 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember | 17 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Long Island Electric Utility Servco LLC Pension and OPEB [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year | 30 us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear / us-gaap_PlanNameAxis = pseg_LongIslandElectricUtilityServcoLLCPensionandOPEBMember |
Total Benefit Costs | $ 6 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_PlanNameAxis = pseg_LongIslandElectricUtilityServcoLLCPensionandOPEBMember | $ 23 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_PlanNameAxis = pseg_LongIslandElectricUtilityServcoLLCPensionandOPEBMember

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