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[Member]pseg_FuturePeriodsAxisxbrldihttp://xbrl.org/2006/xbrldipseg_FiscalYear2014Memberpseg_FuturePeriodsAxisexplicitMemberfalsefalseOther Entity [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldipseg_OtherEntityMemberdei_LegalEntityAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Fiscal Year 2014 [Member] | Other Entity [Member]47true 3us-gaap_LongTermPurchaseCommitmentLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Long-term Purchase Commitment [Line Items]48false 4pseg_CapitalExpenditurespseg_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse4000000040USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryCapital ExpendituresNo definition available.false2Capital Expenditures49false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse19false USDtruefalse$I2013Q2_pseg_FuturePeriodsAxis_pseg_FiscalYear2015Memberhttp://www.sec.gov/CIK0000788784instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseFiscal Year 2015 [Member]pseg_FuturePeriodsAxisxbrldihttp://xbrl.org/2006/xbrldipseg_FiscalYear2015Memberpseg_FuturePeriodsAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Fiscal Year 2015 [Member]50true 3us-gaap_LongTermPurchaseCommitmentLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Long-term Purchase Commitment [Line Items]51false 4pseg_CapitalExpenditurespseg_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse16400000001640USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryCapital ExpendituresNo definition available.false2Capital Expenditures52false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse20false USDtruefalse$I2013Q2_dei_LegalEntityAxis_pseg_PowerMember_pseg_FuturePeriodsAxis_pseg_FiscalYear2015Memberhttp://www.sec.gov/CIK0000788784instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseFiscal Year 2015 [Member]pseg_FuturePeriodsAxisxbrldihttp://xbrl.org/2006/xbrldipseg_FiscalYear2015Memberpseg_FuturePeriodsAxisexplicitMemberfalsefalsePower [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldipseg_PowerMemberdei_LegalEntityAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Fiscal Year 2015 [Member] | Power [Member]53true 3us-gaap_LongTermPurchaseCommitmentLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Long-term Purchase Commitment [Line Items]54false 4pseg_CapitalExpenditurespseg_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse305000000305USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryCapital ExpendituresNo definition available.false2Capital Expenditures55false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse21false USDtruefalse$I2013Q2_dei_LegalEntityAxis_pseg_PseAndGMember_pseg_FuturePeriodsAxis_pseg_FiscalYear2015Memberhttp://www.sec.gov/CIK0000788784instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseFiscal Year 2015 [Member]pseg_FuturePeriodsAxisxbrldihttp://xbrl.org/2006/xbrldipseg_FiscalYear2015Memberpseg_FuturePeriodsAxisexplicitMemberfalsefalsePSE And G [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldipseg_PseAndGMemberdei_LegalEntityAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Fiscal Year 2015 [Member] | PSE And G [Member]56true 3us-gaap_LongTermPurchaseCommitmentLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Long-term Purchase Commitment [Line Items]57false 4pseg_CapitalExpenditurespseg_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse13050000001305USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryCapital ExpendituresNo definition available.false2Capital Expenditures58false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse22false USDtruefalse$I2013Q2_dei_LegalEntityAxis_pseg_OtherEntityMember_pseg_FuturePeriodsAxis_pseg_FiscalYear2015Memberhttp://www.sec.gov/CIK0000788784instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseFiscal Year 2015 [Member]pseg_FuturePeriodsAxisxbrldihttp://xbrl.org/2006/xbrldipseg_FiscalYear2015Memberpseg_FuturePeriodsAxisexplicitMemberfalsefalseOther Entity [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldipseg_OtherEntityMemberdei_LegalEntityAxisexplicitMemberusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Fiscal Year 2015 [Member] | Other Entity [Member]59true 3us-gaap_LongTermPurchaseCommitmentLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Long-term Purchase Commitment [Line Items]60false 4pseg_CapitalExpenditurespseg_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse3000000030USD$falsetruefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryCapital ExpendituresNo definition available.false2Capital ExpendituresfalseCommitments And Contingent Liabilities (Capital Expenditures) (Detail) (USD $)MillionsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.pseg.com/role/CommitmentsAndContingentLiabilitiesCapitalExpendituresDetail260