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Commitments And Contingent Liabilities (Minimum Fuel Purchase Requirements) (Detail) (Power [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Long-term Purchase Commitment [Line Items] |
Coverage percentage of nuclear fuel commitments of uranium, enrichment, and fabrication requirements | 100.00%pseg_CoveragePercentageOfNuclearFuelCommitmentsOfUraniumEnrichmentAndFabricationRequirements
Commitments Through 2018 [Member] | Nuclear Fuel Uranium [Member] |
Long-term Purchase Commitment [Line Items] |
Total minimum purchase requirements | $ 432 us-gaap_LongTermPurchaseCommitmentAmount / dei_LegalEntityAxis = pseg_PowerMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = pseg_NuclearFuelUraniumMember / us-gaap_StatementBusinessSegmentsAxis = pseg_CommitmentsThrough2018Member
Commitments Through 2018 [Member] | Nuclear Fuel Enrichment [Member] |
Long-term Purchase Commitment [Line Items] |
Total minimum purchase requirements | 428 us-gaap_LongTermPurchaseCommitmentAmount / dei_LegalEntityAxis = pseg_PowerMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = pseg_NuclearFuelEnrichmentMember / us-gaap_StatementBusinessSegmentsAxis = pseg_CommitmentsThrough2018Member
Commitments Through 2018 [Member] | Nuclear Fuel Fabrication [Member] |
Long-term Purchase Commitment [Line Items] |
Total minimum purchase requirements | 185 us-gaap_LongTermPurchaseCommitmentAmount / dei_LegalEntityAxis = pseg_PowerMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = pseg_NuclearFuelFabricationMember / us-gaap_StatementBusinessSegmentsAxis = pseg_CommitmentsThrough2018Member
Commitments Through 2018 [Member] | Natural Gas [Member] |
Long-term Purchase Commitment [Line Items] |
Total minimum purchase requirements | 1,060 us-gaap_LongTermPurchaseCommitmentAmount / dei_LegalEntityAxis = pseg_PowerMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = pseg_NaturalGasMember / us-gaap_StatementBusinessSegmentsAxis = pseg_CommitmentsThrough2018Member
Commitments Through 2018 [Member] | Coal [Member] |
Long-term Purchase Commitment [Line Items] |
Total minimum purchase requirements | $ 277 us-gaap_LongTermPurchaseCommitmentAmount / dei_LegalEntityAxis = pseg_PowerMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = pseg_CoalOilMember / us-gaap_StatementBusinessSegmentsAxis = pseg_CommitmentsThrough2018Member

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- Definition Coverage percentage of nuclear fuel commitments of uranium, enrichment, and fabrication requirements. + References No definition available. + Details
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Namespace Prefix: | pseg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition No authoritative reference available. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration