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5sre_DerivativeOffsettingCommodityContractsSubjectToRateRecoveryNondesignatedsre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse20000002USD$falsefalsefalse2truefalsefalse40000004USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Associated offsetting commodity contracts subject to rate recovery58false 5sre_OtherDerivativesAsHedgingInstrumentsAtFairValueNetBeforeCashCollateralsre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-49000000-49USD$falsefalsefalse2truefalsefalse-46000000-46USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Net amount presented on balance sheet59false 5us-gaap_DerivativeInstrumentsInHedgesAtFairValueNetus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-49000000-49USD$falsefalsefalse2truefalsefalse-46000000-46USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAggregate net fair value of all derivative instruments designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 true2Total60false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse13false USDtruefalse$AS_OF_Jun30_2013_dei_LegalEntityAxis_SanDiegoGasAndElectricCompanyAndSubsidiaryMember_us-gaap_BalanceSheetLocationAxis_FixedPriceContractsAndOtherDerivativesCurrentLiabilitiesMemberhttp://www.sec.gov/CIK0001032208instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseFixed Price Contracts And Other Derivatives, Current Liabilities [Member]us-gaap_BalanceSheetLocationAxisxbrldihttp://xbrl.org/2006/xbrldisre_FixedPriceContractsAndOtherDerivativesCurrentLiabilitiesMemberus-gaap_BalanceSheetLocationAxisexplicitMemberfalsefalseSan Diego Gas and Electric Company and Subsidiary [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldisre_SanDiegoGasAndElectricCompanyAndSubsidiaryMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Fixed Price Contracts And Other Derivatives, Current Liabilities [Member] | San Diego Gas and Electric Company and Subsidiary [Member]61true 4us-gaap_DerivativeInstrumentsInHedgesAtFairValueNetAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Derivative Instruments in Hedges, at Fair Value, Net [Abstract]62false 5sre_DerivativeInterestRateAndForeignExchangeInstrumentsDesignatedsre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-16000000-16[1]USD$falsefalsefalse2truefalsefalse-17000000-17[1]USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Interest rate and foreign exchange instruments63true 4us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNetTotalAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]64false 5sre_DerivativeCommodityContractsSubjectToRateRecoveryNondesignatedsre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-24000000-24USD$falsefalsefalse2truefalsefalse-33000000-33USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Commodity contracts subject to rate recovery65false 5sre_AssociatedCashCollateralCommodityContractsSubjectToRateRecoverysre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse1500000015USD$falsefalsefalse2truefalsefalse2200000022USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Associated cash collateral commodity contracts subject to rate recovery66false 5sre_DerivativeOffsettingCommodityContractsSubjectToRateRecoveryNondesignatedsre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse10000001USD$falsefalsefalse2truefalsefalse30000003USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Associated offsetting commodity contracts subject to rate recovery67false 5sre_OtherDerivativesAsHedgingInstrumentsAtFairValueNetBeforeCashCollateralsre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-24000000-24USD$falsefalsefalse2truefalsefalse-25000000-25USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Net amount presented on balance sheet68false 5us-gaap_DerivativeInstrumentsInHedgesAtFairValueNetus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-24000000-24USD$falsefalsefalse2truefalsefalse-25000000-25USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAggregate net fair value of all derivative instruments designated as hedging instruments. 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Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 true2Total69false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse15false USDtruefalse$AS_OF_Jun30_2013_dei_LegalEntityAxis_SouthernCaliforniaGasCompanyMember_us-gaap_BalanceSheetLocationAxis_FixedPriceContractsAndOtherDerivativesCurrentLiabilitiesMemberhttp://www.sec.gov/CIK0001032208instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseFixed Price Contracts And Other Derivatives, Current Liabilities [Member]us-gaap_BalanceSheetLocationAxisxbrldihttp://xbrl.org/2006/xbrldisre_FixedPriceContractsAndOtherDerivativesCurrentLiabilitiesMemberus-gaap_BalanceSheetLocationAxisexplicitMemberfalsefalseSouthern California Gas Company [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldisre_SouthernCaliforniaGasCompanyMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Fixed Price Contracts And Other Derivatives, Current Liabilities [Member] | Southern California Gas Company [Member]70true 4us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNetTotalAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]71false 5sre_DerivativeCommodityContractsSubjectToRateRecoveryNondesignatedsre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-2000000-2[4]USD$falsefalsefalse2truefalsefalse-2000000-2[4]USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Commodity contracts subject to rate recovery72false 5sre_DerivativeOffsettingCommodityContractsSubjectToRateRecoveryNondesignatedsre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse10000001[4]USD$falsefalsefalse2truefalsefalse10000001[4]USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Associated offsetting commodity contracts subject to rate recovery73false 5sre_OtherDerivativesAsHedgingInstrumentsAtFairValueNetBeforeCashCollateralsre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-1000000-1[4]USD$falsefalsefalse2truefalsefalse-1000000-1[4]USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Net amount presented on balance sheet74false 5us-gaap_DerivativeInstrumentsInHedgesAtFairValueNetus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-1000000-1[4]USD$falsefalsefalse2truefalsefalse-1000000-1[4]USD$falsefalsefalsexbrli:monetaryItemTypemonetaryAggregate net fair value of all derivative instruments designated as hedging instruments. 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Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 true2Total75false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse17false USDtruefalse$AS_OF_Jun30_2013_us-gaap_BalanceSheetLocationAxis_FixedPriceContractsAndOtherDerivativesNoncurrentLiabilitiesMemberhttp://www.sec.gov/CIK0001032208instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseFixed Price Contracts And Other Derivatives, Noncurrent Liabilities [Member]us-gaap_BalanceSheetLocationAxisxbrldihttp://xbrl.org/2006/xbrldisre_FixedPriceContractsAndOtherDerivativesNoncurrentLiabilitiesMemberus-gaap_BalanceSheetLocationAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Fixed Price Contracts And Other Derivatives, Noncurrent Liabilities [Member]76true 4us-gaap_DerivativeInstrumentsInHedgesAtFairValueNetAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Derivative Instruments in Hedges, at Fair Value, Net [Abstract]77false 5sre_DerivativeInterestRateAndForeignExchangeInstrumentsDesignatedsre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-74000000-74[1]USD$falsefalsefalse2truefalsefalse-64000000-64[1]USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Interest rate and foreign exchange instruments78true 4us-gaap_OtherDerivativesNotDesignatedAsHedgingInstrumentsAtFairValueNetTotalAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net, Total [Abstract]79false 5sre_DerivativeInterestRateAndForeignExchangeInstrumentsNondesignatedsre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-22000000-22USD$falsefalsefalse2truefalsefalse-35000000-35USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Interest rate and foreign exchange instruments80false 5sre_DerivativeCommodityContractsNotSubjectToRateRecoveryNondesignatedsre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-13000000-13USD$falsefalsefalse2truefalsefalse-27000000-27USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Commodity contracts not subject to rate recovery81false 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5sre_DerivativeCommodityContractsSubjectToRateRecoveryNondesignatedsre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-2000000-2USD$falsefalsefalse2truefalsefalse-1000000-1USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Commodity contracts subject to rate recovery84false 5sre_AssociatedCashCollateralCommodityContractsSubjectToRateRecoverysre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel1truefalsefalse20000002USD$falsefalsefalse2truefalsefalse10000001USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Associated cash collateral commodity contracts subject to rate recovery85false 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