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Financing Receivables (Narrative) (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015
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Lease investment with non-investment grade counterparties, gross | $ 573 pseg_LeaseInvestmentWithNonInvestmentGradeCounterpartiesGross
Lease investment with non-investment grade counterparties, net of deferred taxes | $ (9)pseg_LeaseInvestmentWithNonInvestmentGradeCounterpartiesNetOfDeferredTaxes
Powerton Station [Member] |
Lease Receivable Percent Owned | 64.00%pseg_LeaseReceivablePercentOwned / us-gaap_PropertyPlantAndEquipmentByTypeAxis = pseg_PowertonStationMember

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- Definition Lease Investment With Non Investment Grade Counterparties Gross + References No definition available. + Details
Name: | pseg_LeaseInvestmentWithNonInvestmentGradeCounterpartiesGross
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Lease Investment With Non Investment Grade Counterparties Net Of Deferred Taxes + References No definition available. + Details
Name: | pseg_LeaseInvestmentWithNonInvestmentGradeCounterpartiesNetOfDeferredTaxes
Namespace Prefix: | pseg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Lease Receivable, Percent Owned + References No definition available. + Details
Name: | pseg_LeaseReceivablePercentOwned
Namespace Prefix: | pseg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=pseg_PowertonStationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |