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USDtruefalseFROM_Apr01_2013_TO_Jun30_2013_dei_LegalEntityAxis_SanDiegoGasAndElectricCompanyAndSubsidiaryMember_sre_InterestRateDerivativesTypeAxis_CashFlowHedgingMemberhttp://www.sec.gov/CIK0001032208duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseSan Diego Gas and Electric Company and Subsidiary [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldisre_SanDiegoGasAndElectricCompanyAndSubsidiaryMemberdei_LegalEntityAxisexplicitMemberfalsefalseCash Flow Hedgessre_InterestRateDerivativesTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CashFlowHedgingMembersre_InterestRateDerivativesTypeAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$nanafalse0San Diego Gas and Electric Company and Subsidiary [Member] | Cash Flow Hedges17true 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Mesa VIE. All of SDG&E’s amounts relate to Otay Mesa VIE.falseDERIVATIVE FINANCIAL INSTRUMENTS 2 (Details) (USD $)MillionsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.sempra.com/role/DisclosureDERIVATIVEFINANCIALINSTRUMENTS2Details219