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5sre_FairValueLiabilitiesMeasuredOnRecurringBasisCommodityContractsSubjectToRateRecoverysre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse1700000017USD$falsefalsefalse2truefalsefalse2300000023USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Commodity contracts subject to rate recovery, liabilities61false 5sre_FairValueLiabilitiesMeasuredOnRecurringBasisTotalLiabilitiesAtFairValuesre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse1700000017USD$falsefalsefalse2truefalsefalse2300000023USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Total fair value of liabilities measured on a recurring basis62false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse11false USDtruefalse$AS_OF_Jun30_2013_dei_LegalEntityAxis_SouthernCaliforniaGasCompanyMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_FairValueInputsLevel1Memberhttp://www.sec.gov/CIK0001032208instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseLevel 1us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel1Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseSouthern California Gas Company [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldisre_SouthernCaliforniaGasCompanyMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Level 1 | Southern California Gas Company [Member]63true 4us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]64false 5sre_FairValueAssetsMeasuredOnRecurringBasisCommodityContractsSubjectToRateRecoverysre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse20000002USD$falsefalsefalse2truefalsefalse10000001USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Commodity contracts subject to rate recovery, assets65false 5sre_FairValueAssetsMeasuredOnRecurringBasisCommodityContractsNotSubjectToRateRecoverysre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse30000003USD$falsefalsefalse2truefalsefalse30000003USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Commodity contracts not subject to rate recovery, assets66false 5sre_FairValueAssetsMeasuredOnRecurringBasisTotalAssetsAtFairValuesre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse50000005USD$falsefalsefalse2truefalsefalse40000004USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Total fair value of assets measured on a recurring basis67false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse13false USDtruefalse$AS_OF_Jun30_2013_us-gaap_FairValueByFairValueHierarchyLevelAxis_FairValueInputsLevel2Memberhttp://www.sec.gov/CIK0001032208instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseLevel 2us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Level 268true 4us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]69false 5sre_FairValueAssetsMeasuredOnRecurringBasisNuclearDecommissioningTrustsUSDebtSecuritiessre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse7000000070USD$falsefalsefalse2truefalsefalse6900000069USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies70false 5sre_FairValueAssetsMeasuredOnRecurringBasisNuclearDecommissioningTrustsMunicipalDebtSecuritiessre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse7400000074USD$falsefalsefalse2truefalsefalse6300000063USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Nuclear decomissioning trusts - Municipal debt securities71false 5sre_FairValueAssetsMeasuredOnRecurringBasisNuclearDecommissioningTrustsOtherDebtSecuritiessre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse136000000136USD$falsefalsefalse2truefalsefalse130000000130USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Nuclear decommissioning trusts - Other debt securities72false 5sre_FairValueAssetsMeasuredOnRecurringBasisNuclearDecommissioningTrustsTotalDebtSecuritiessre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse280000000280USD$falsefalsefalse2truefalsefalse262000000262USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Nuclear decommissioning trusts - Total debt securities73false 5sre_FairValueAssetsMeasuredOnRecurringBasisNuclearDecommissioningTrustsTotalsre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse280000000280[1]USD$falsefalsefalse2truefalsefalse262000000262[1]USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Total nuclear decommissioning trusts74false 5sre_FairValueAssetsMeasuredOnRecurringBasisInterestRateInstrumentssre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse7300000073USD$falsefalsefalse2truefalsefalse6800000068USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Interest rate instruments, assets75false 5sre_FairValueAssetsMeasuredOnRecurringBasisCommodityContractsNotSubjectToRateRecoverysre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse1300000013USD$falsefalsefalse2truefalsefalse1500000015USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Commodity contracts not subject to rate recovery, assets76false 5sre_FairValueAssetsMeasuredOnRecurringBasisTotalAssetsAtFairValuesre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse366000000366USD$falsefalsefalse2truefalsefalse345000000345USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Total fair value of assets measured on a recurring basis77false 5sre_FairValueLiabilitiesMeasuredOnRecurringBasisInterestRateInstrumentssre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse124000000124USD$falsefalsefalse2truefalsefalse126000000126USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Interest rate instruments, liabilities78false 5sre_FairValueLiabilitiesMeasuredOnRecurringBasisCommodityContractsSubjectToRateRecoverysre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse90000009USD$falsefalsefalse2truefalsefalse90000009USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Commodity contracts subject to rate recovery, liabilities79false 5sre_FairValueLiabilitiesMeasuredOnRecurringBasisCommodityContractsNotSubjectToRateRecoverysre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse1400000014USD$falsefalsefalse2truefalsefalse2300000023USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Commodity contracts not subject to rate recovery, liabilities80false 5sre_FairValueLiabilitiesMeasuredOnRecurringBasisTotalLiabilitiesAtFairValuesre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse147000000147USD$falsefalsefalse2truefalsefalse158000000158USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Total fair value of liabilities measured on a recurring basis81false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse15false USDtruefalse$AS_OF_Jun30_2013_dei_LegalEntityAxis_SanDiegoGasAndElectricCompanyAndSubsidiaryMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_FairValueInputsLevel2Memberhttp://www.sec.gov/CIK0001032208instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseLevel 2us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseSan Diego Gas and Electric Company and Subsidiary [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldisre_SanDiegoGasAndElectricCompanyAndSubsidiaryMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Level 2 | San Diego Gas and Electric Company and Subsidiary [Member]82true 4us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]83false 5sre_FairValueAssetsMeasuredOnRecurringBasisNuclearDecommissioningTrustsUSDebtSecuritiessre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse7000000070USD$falsefalsefalse2truefalsefalse6900000069USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies84false 5sre_FairValueAssetsMeasuredOnRecurringBasisNuclearDecommissioningTrustsMunicipalDebtSecuritiessre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse7400000074USD$falsefalsefalse2truefalsefalse6300000063USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Nuclear decomissioning trusts - Municipal debt securities85false 5sre_FairValueAssetsMeasuredOnRecurringBasisNuclearDecommissioningTrustsOtherDebtSecuritiessre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse136000000136USD$falsefalsefalse2truefalsefalse130000000130USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Nuclear decommissioning trusts - Other debt securities86false 5sre_FairValueAssetsMeasuredOnRecurringBasisNuclearDecommissioningTrustsTotalDebtSecuritiessre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse280000000280USD$falsefalsefalse2truefalsefalse262000000262USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Nuclear decommissioning trusts - Total debt securities87false 5sre_FairValueAssetsMeasuredOnRecurringBasisNuclearDecommissioningTrustsTotalsre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse280000000280[1]USD$falsefalsefalse2truefalsefalse262000000262[1]USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Total nuclear decommissioning trusts88false 5sre_FairValueAssetsMeasuredOnRecurringBasisTotalAssetsAtFairValuesre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse280000000280USD$falsefalsefalse2truefalsefalse262000000262USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Total fair value of assets measured on a recurring basis89false 5sre_FairValueLiabilitiesMeasuredOnRecurringBasisInterestRateInstrumentssre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse6000000060USD$falsefalsefalse2truefalsefalse8100000081USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Interest rate instruments, liabilities90false 5sre_FairValueLiabilitiesMeasuredOnRecurringBasisCommodityContractsSubjectToRateRecoverysre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse80000008USD$falsefalsefalse2truefalsefalse80000008USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Commodity contracts subject to rate recovery, liabilities91false 5sre_FairValueLiabilitiesMeasuredOnRecurringBasisTotalLiabilitiesAtFairValuesre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse6800000068USD$falsefalsefalse2truefalsefalse8900000089USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Total fair value of liabilities measured on a recurring basis92false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse17false USDtruefalse$AS_OF_Jun30_2013_dei_LegalEntityAxis_SouthernCaliforniaGasCompanyMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_FairValueInputsLevel2Memberhttp://www.sec.gov/CIK0001032208instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseLevel 2us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel2Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseSouthern California Gas Company [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldisre_SouthernCaliforniaGasCompanyMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Level 2 | Southern California Gas Company [Member]93true 4us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]94false 5sre_FairValueLiabilitiesMeasuredOnRecurringBasisCommodityContractsSubjectToRateRecoverysre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse10000001USD$falsefalsefalse2truefalsefalse10000001USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Commodity contracts subject to rate recovery, liabilities95false 5sre_FairValueLiabilitiesMeasuredOnRecurringBasisTotalLiabilitiesAtFairValuesre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse10000001USD$falsefalsefalse2truefalsefalse10000001USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Total fair value of liabilities measured on a recurring basis96false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse19false USDtruefalse$AS_OF_Jun30_2013_us-gaap_FairValueByFairValueHierarchyLevelAxis_FairValueInputsLevel3Memberhttp://www.sec.gov/CIK0001032208instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseLevel 3us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Level 397true 4us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]98false 5sre_FairValueAssetsMeasuredOnRecurringBasisCommodityContractsSubjectToRateRecoverysre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse4700000047USD$falsefalsefalse2truefalsefalse6100000061USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Commodity contracts subject to rate recovery, assets99false 5sre_FairValueAssetsMeasuredOnRecurringBasisCommodityContractsNotSubjectToRateRecoverysre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-10000000-10USD$falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Commodity contracts not subject to rate recovery, assets100false 5sre_FairValueAssetsMeasuredOnRecurringBasisTotalAssetsAtFairValuesre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse3700000037USD$falsefalsefalse2truefalsefalse6100000061USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Total fair value of assets measured on a recurring basis101false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse21false USDtruefalse$AS_OF_Jun30_2013_dei_LegalEntityAxis_SanDiegoGasAndElectricCompanyAndSubsidiaryMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_FairValueInputsLevel3Memberhttp://www.sec.gov/CIK0001032208instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseLevel 3us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_FairValueInputsLevel3Memberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseSan Diego Gas and Electric Company and Subsidiary [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldisre_SanDiegoGasAndElectricCompanyAndSubsidiaryMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Level 3 | San Diego Gas and Electric Company and Subsidiary [Member]102true 4us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]103false 5sre_FairValueAssetsMeasuredOnRecurringBasisCommodityContractsSubjectToRateRecoverysre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse4700000047USD$falsefalsefalse2truefalsefalse6100000061USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Commodity contracts subject to rate recovery, assets104false 5sre_FairValueAssetsMeasuredOnRecurringBasisTotalAssetsAtFairValuesre_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse4700000047USD$falsefalsefalse2truefalsefalse6100000061USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Total fair value of assets measured on a recurring basis105false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse23false USDtruefalse$AS_OF_Jun30_2013_us-gaap_FairValueByFairValueHierarchyLevelAxis_CollateralNettedMemberhttp://www.sec.gov/CIK0001032208instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseCollateral Netted [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldisre_CollateralNettedMemberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Collateral Netted [Member]106true 4us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]107false 5sre_FairValueLiabilitiesMeasuredOnRecurringBasisCommodityContractsSubjectToRateRecoverysre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-17000000-17USD$falsefalsefalse2truefalsefalse-23000000-23USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Commodity contracts subject to rate recovery, liabilities108false 5sre_FairValueLiabilitiesMeasuredOnRecurringBasisCommodityContractsNotSubjectToRateRecoverysre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-1000000-1USD$falsefalsefalse2truefalsefalse-11000000-11USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Commodity contracts not subject to rate recovery, liabilities109false 5sre_FairValueLiabilitiesMeasuredOnRecurringBasisTotalLiabilitiesAtFairValuesre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-18000000-18USD$falsefalsefalse2truefalsefalse-34000000-34USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Total fair value of liabilities measured on a recurring basis110false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse25false USDtruefalse$AS_OF_Jun30_2013_dei_LegalEntityAxis_SanDiegoGasAndElectricCompanyAndSubsidiaryMember_us-gaap_FairValueByFairValueHierarchyLevelAxis_CollateralNettedMemberhttp://www.sec.gov/CIK0001032208instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseCollateral Netted [Member]us-gaap_FairValueByFairValueHierarchyLevelAxisxbrldihttp://xbrl.org/2006/xbrldisre_CollateralNettedMemberus-gaap_FairValueByFairValueHierarchyLevelAxisexplicitMemberfalsefalseSan Diego Gas and Electric Company and Subsidiary [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldisre_SanDiegoGasAndElectricCompanyAndSubsidiaryMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Collateral Netted [Member] | San Diego Gas and Electric Company and Subsidiary [Member]111true 4us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]112false 5sre_FairValueLiabilitiesMeasuredOnRecurringBasisCommodityContractsSubjectToRateRecoverysre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-17000000-17USD$falsefalsefalse2truefalsefalse-23000000-23USD$falsefalsefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.false2Commodity contracts subject to rate recovery, liabilities113false 5sre_FairValueLiabilitiesMeasuredOnRecurringBasisTotalLiabilitiesAtFairValuesre_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalsetotalLabel1truefalsefalse-17000000-17USD$falsetruefalse2truefalsefalse-23000000-23USD$falsetruefalsexbrli:monetaryItemTypemonetaryNo authoritative reference available.No definition available.true2Total fair value of liabilities measured on a recurring basis1Excludes cash balances and cash equivalents.falseFAIR VALUE MEASUREMENTS 3 (Details) (USD $)MillionsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.sempra.com/role/DisclosureFAIRVALUEMEASUREMENTS3Details2113