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These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.falsefalseLong-term Purchase Commitment [Line Items]58false0us-gaap_LongTermPurchaseCommitmentAmountus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse5100000051000000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryThe minimum amount the entity agreed to spend under the long-term purchase commitment.No authoritative reference available.falsefalseLong-term Purchase Commitment, Amount60false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.sempra.com/role/disclosurecommitmentsandcontingenciescontractualcommitmentsdetails1falsefalsefalse00falsefalsefalsefalsefalse13falsefalseUSDtruefalse{dei_LegalEntityAxis} : San Diego Gas and Electric Company and Subsidiary [Member] 3/31/2011 USD ($) $AS_OF_Mar31_2011_dei_LegalEntityAxis_SanDiegoGasAndElectricCompanyAndSubsidiaryMemberhttp://www.sec.gov/CIK0001032208instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseSan Diego Gas and Electric Company and Subsidiary [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldisre_SanDiegoGasAndElectricCompanyAndSubsidiaryMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDUSD$OthernaNo definition available.No authoritative reference available.falsefalseSan Diego Gas and Electric Company and Subsidiary [Member]62true0sre_PaymentsUnderContractualCommitmentsLineItemssrefalsenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringNo definition available.falsefalsePayments Under Contractual Commitments [Line Items]63false0sre_ContractualCommitmentsPaymentsDueCurrentsrefalsecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse331000000331000000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseContractual Commitments, Payments Due, Current64false0sre_ContractualCommitmentsPaymentsDueInTwoYearssrefalsecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse5600000056000000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseContractual Commitments, Payments Due In Two Years65false0sre_ContractualCommitmentsPaymentsDueInThreeYearssrefalsecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse30000003000000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseContractual Commitments, Payments Due In Three Years66false0sre_ContractualCommitmentsPaymentsDueInFourYearssrefalsecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse20000002000000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseContractual Commitments, Payments Due In Four Years67false0sre_ContractualCommitmentsPaymentsDueInFiveYearssrefalsecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse20000002000000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseContractual Commitments, Payments Due In Five Years68false0sre_ContractualCommitmentsPaymentsDueThereaftersrefalsecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1truefalsefalse5700000057000000falsefalsefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryNo definition available.No authoritative reference available.falsefalseContractual Commitments, Payments Due Thereafter69false0natruenanaNo definition available.falsetruefalsefalsefalsefalsefalsefalsefalsefalsehttp://www.sempra.com/role/disclosurecommitmentsandcontingenciescontractualcommitmentsdetails1falsefalsefalse00falsefalsefalsefalsefalse14falsefalseUSDtruefalse{dei_LegalEntityAxis} : Southern California Gas Company [Member] 1/1/2011 - 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