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Such securities are reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 21 -Subparagraph a false 16 Gross realized losses 2 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses us-gaap true debit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -5000000 -5 false false false 2 false true false false -7000000 -7 false false false 3 false true false false -7000000 -7 false false false 4 false true false false -24000000 -24 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. 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No authoritative reference available. false 62 Derivative, Fair Value, Gross Amount Not Offset Against Collateral, Net [Abstract] 2 us-gaap_DerivativeFairValueGrossAmountNotOffsetAgainstCollateralNetAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 63 Fair value of cash collateral receivables not offset against derivatives 2 us-gaap_DerivativeFairValueGrossAmountNotOffsetAgainstCollateralNet us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 30000000 30 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 36000000 36 false false false xbrli:monetaryItemType monetary The net amount as of the balance sheet date of the fair value of derivative assets and derivative liabilities that in accordance with the entity's accounting policy were not offset against collateral under a master netting arrangement. 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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. false 65 Nuclear decommissioning trusts - equity securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsEquitySecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 368000000 368 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 421000000 421 false false false xbrli:monetaryItemType monetary No definition available. 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No authoritative reference available. false 67 Nuclear decomissioning trusts - Municipal debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsMunicipalDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 82000000 82 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 85000000 85 false false false xbrli:monetaryItemType monetary No definition available. 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No authoritative reference available. true 71 Interest rate instruments, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisInterestRateInstruments sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 44000000 44 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 38000000 38 false false false xbrli:monetaryItemType monetary No definition available. 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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. false 108 Nuclear decommissioning trusts - equity securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsEquitySecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 368000000 368 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 421000000 421 false false false xbrli:monetaryItemType monetary No definition available. 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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. false 151 Nuclear decommissioning trusts - equity securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsEquitySecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. 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No authoritative reference available. false 196 Nuclear decomissioning trusts - Municipal debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsMunicipalDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 197 Nuclear decommissioning trusts - Other debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsOtherDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 198 Nuclear decommissioning trusts - Total debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsTotalDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. true 199 Total nuclear decommissioning trusts 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsTotal sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 0 0 [1] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 [1] false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. true 200 Interest rate instruments, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisInterestRateInstruments sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 201 Commodity contracts subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 7000000 7 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 10000000 10 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 202 Commodity contracts not subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsNotSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 203 Investments 2 us-gaap_FairValueMeasuredOnRecurringBasisInvestments us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. 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No authoritative reference available. false 238 Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsUSDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 239 Nuclear decomissioning trusts - Municipal debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsMunicipalDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 240 Nuclear decommissioning trusts - Other debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsOtherDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 241 Nuclear decommissioning trusts - Total debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsTotalDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. true 242 Total nuclear decommissioning trusts 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsTotal sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 0 0 [1] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 [1] false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. true 243 Interest rate instruments, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisInterestRateInstruments sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 244 Commodity contracts subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. 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No authoritative reference available. false 246 Investments 2 us-gaap_FairValueMeasuredOnRecurringBasisInvestments us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary This element represents a certain statement of financial position asset caption which represents a class of assets, or which may include an individual asset, measured at fair value on a recurring basis. 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No authoritative reference available. false 260 Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] 2 us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string Line items represent financial concepts included in a table. 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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. false 538 Nuclear decommissioning trusts - equity securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsEquitySecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 368000000 368 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 421000000 421 false false false xbrli:monetaryItemType monetary No definition available. 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No authoritative reference available. false 540 Nuclear decomissioning trusts - Municipal debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsMunicipalDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 82000000 82 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 85000000 85 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 541 Nuclear decommissioning trusts - Other debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsOtherDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 29000000 29 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 13000000 13 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 542 Nuclear decommissioning trusts - Total debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsTotalDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 293000000 293 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 248000000 248 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. true 543 Total nuclear decommissioning trusts 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsTotal sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 661000000 661 [1] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 669000000 669 [1] false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. true 545 Commodity contracts subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 30000000 30 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 41000000 41 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 546 Commodity contracts not subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsNotSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 1000000 1 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 1000000 1 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 548 Total fair value of assets measured on a recurring basis 2 sre_FairValueAssetsMeasuredOnARecurringBasisTotalAssetsAtFairValue sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 692000000 692 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 711000000 711 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. true 549 Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] 2 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisFinancialStatementCaptionsLineItems us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. false 550 Interest rate instruments, liabilities 2 sre_FairValueLiabilitiesMeasuredOnARecurringBasisInterestRateInstruments sre false credit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 67000000 67 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 43000000 43 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 551 Commodity contracts subject to rate recovery, liabilities 2 sre_FairValueLiabilitiesMeasuredOnARecurringBasisCommodityContractsSubjectToRateRecovery sre false credit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 1000000 1 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 553 Total fair value of liabilities measured on a recurring basis 2 sre_FairValueLiabilitiesMeasuredOnARecurringBasisTotalLiabilitiesAtFairValue sre false credit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 68000000 68 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 43000000 43 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. true 560 San Diego Gas and Electric Company | Level 1 0 na true na na No definition available. false true false false false false false false false false false http://www.sempra.com/role/disclosurefairvaluemeasurementsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 30 USD true false false false San Diego Gas and Electric Company dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi sre_SanDiegoGasAndElectricCompanyAndSubsidiaryMember dei_LegalEntityAxis explicitMember false false Level 1 us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueInputsLevel1Member us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 31 USD true false false false San Diego Gas and Electric Company dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi sre_SanDiegoGasAndElectricCompanyAndSubsidiaryMember dei_LegalEntityAxis explicitMember false false Level 1 us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueInputsLevel1Member us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 580 Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisFinancialStatementCaptionsLineItems us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. false 581 Nuclear decommissioning trusts - equity securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsEquitySecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 368000000 368 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 421000000 421 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 582 Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsUSDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 148000000 148 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 111000000 111 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 583 Nuclear decomissioning trusts - Municipal debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsMunicipalDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 584 Nuclear decommissioning trusts - Other debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsOtherDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 585 Nuclear decommissioning trusts - Total debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsTotalDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 148000000 148 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 111000000 111 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. true 586 Total nuclear decommissioning trusts 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsTotal sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 516000000 516 [1] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 532000000 532 [1] false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. true 588 Commodity contracts subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 23000000 23 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 29000000 29 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 589 Commodity contracts not subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsNotSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 1000000 1 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 1000000 1 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 591 Total fair value of assets measured on a recurring basis 2 sre_FairValueAssetsMeasuredOnARecurringBasisTotalAssetsAtFairValue sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 540000000 540 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 562000000 562 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. true 603 San Diego Gas and Electric Company | Level 2 0 na true na na No definition available. false true false false false false false false false false false http://www.sempra.com/role/disclosurefairvaluemeasurementsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 32 USD true false false false San Diego Gas and Electric Company dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi sre_SanDiegoGasAndElectricCompanyAndSubsidiaryMember dei_LegalEntityAxis explicitMember false false Level 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueInputsLevel2Member us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 33 USD true false false false San Diego Gas and Electric Company dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi sre_SanDiegoGasAndElectricCompanyAndSubsidiaryMember dei_LegalEntityAxis explicitMember false false Level 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueInputsLevel2Member us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 623 Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisFinancialStatementCaptionsLineItems us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. false 624 Nuclear decommissioning trusts - equity securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsEquitySecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 625 Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsUSDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 34000000 34 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 39000000 39 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 626 Nuclear decomissioning trusts - Municipal debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsMunicipalDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 82000000 82 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 85000000 85 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 627 Nuclear decommissioning trusts - Other debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsOtherDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 29000000 29 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 13000000 13 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 628 Nuclear decommissioning trusts - Total debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsTotalDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 145000000 145 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 137000000 137 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. true 629 Total nuclear decommissioning trusts 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsTotal sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 145000000 145 [1] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 137000000 137 [1] false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. true 631 Commodity contracts subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 2000000 2 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 632 Commodity contracts not subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsNotSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 634 Total fair value of assets measured on a recurring basis 2 sre_FairValueAssetsMeasuredOnARecurringBasisTotalAssetsAtFairValue sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 145000000 145 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 139000000 139 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. true 646 San Diego Gas and Electric Company | Level 3 0 na true na na No definition available. false true false false false false false false false false false http://www.sempra.com/role/disclosurefairvaluemeasurementsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 34 USD true false false false San Diego Gas and Electric Company dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi sre_SanDiegoGasAndElectricCompanyAndSubsidiaryMember dei_LegalEntityAxis explicitMember false false Level 3 us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueInputsLevel3Member us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 35 USD true false false false San Diego Gas and Electric Company dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi sre_SanDiegoGasAndElectricCompanyAndSubsidiaryMember dei_LegalEntityAxis explicitMember false false Level 3 us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_FairValueInputsLevel3Member us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 666 Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisFinancialStatementCaptionsLineItems us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. false 667 Nuclear decommissioning trusts - equity securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsEquitySecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 668 Nuclear decommissioning trusts - Debt securities issued by the U.S. Treasury and other U.S. government corporations and agencies 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsUSDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 669 Nuclear decomissioning trusts - Municipal debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsMunicipalDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 670 Nuclear decommissioning trusts - Other debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsOtherDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 671 Nuclear decommissioning trusts - Total debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsTotalDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. true 672 Total nuclear decommissioning trusts 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsTotal sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 0 0 [1] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 [1] false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. true 674 Commodity contracts subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 7000000 7 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 10000000 10 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 675 Commodity contracts not subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsNotSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 677 Total fair value of assets measured on a recurring basis 2 sre_FairValueAssetsMeasuredOnARecurringBasisTotalAssetsAtFairValue sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 7000000 7 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 10000000 10 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. true 689 San Diego Gas and Electric Company | Collateral Netted 0 na true na na No definition available. false true false false false false false false false false false http://www.sempra.com/role/disclosurefairvaluemeasurementsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 36 USD true false false false San Diego Gas and Electric Company dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi sre_SanDiegoGasAndElectricCompanyAndSubsidiaryMember dei_LegalEntityAxis explicitMember false false Collateral Netted us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis xbrldi http://xbrl.org/2006/xbrldi sre_CollateralNettedMember us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 37 USD true false false false San Diego Gas and Electric Company dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi sre_SanDiegoGasAndElectricCompanyAndSubsidiaryMember dei_LegalEntityAxis explicitMember false false Collateral Netted us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis xbrldi http://xbrl.org/2006/xbrldi sre_CollateralNettedMember us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 709 Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisFinancialStatementCaptionsLineItems us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. false 710 Nuclear decommissioning trusts - equity securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsEquitySecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. 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No authoritative reference available. false 712 Nuclear decomissioning trusts - Municipal debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsMunicipalDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 713 Nuclear decommissioning trusts - Other debt securities 2 sre_FairValueAssetsMeasuredOnARecurringBasisNuclearDecommissioningTrustsOtherDebtSecurities sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. 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No authoritative reference available. false 718 Commodity contracts not subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsNotSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 720 Total fair value of assets measured on a recurring basis 2 sre_FairValueAssetsMeasuredOnARecurringBasisTotalAssetsAtFairValue sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. 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No authoritative reference available. false 733 Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] 2 us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string Line items represent financial concepts included in a table. 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No authoritative reference available. false 776 Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] 2 us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string Line items represent financial concepts included in a table. 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No authoritative reference available. false 991 Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] 2 us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. false 993 Fair value of financial instruments, Total long-term debt 2 us-gaap_NotesPayableFairValueDisclosure us-gaap true credit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 1288000000 1288 [5] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 1296000000 1296 [5] false false false xbrli:monetaryItemType monetary This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents notes payable as of the balance sheet date. 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No authoritative reference available. false 997 Fair value of financial instruments, Preferred stock 2 sre_PreferredStockFairValueDisclosure sre false credit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 80000000 80 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 80000000 80 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 1033 Pacific Enterprises and Subsidiaries | Fair Value 0 na true na na No definition available. false true false false false false false false false false false http://www.sempra.com/role/disclosurefairvaluemeasurementsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 52 USD true false false false Pacific Enterprises and Subsidiaries dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi sre_PacificEnterprisesMember dei_LegalEntityAxis explicitMember false false Fair Value us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_EstimateOfFairValueFairValueDisclosureMember us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 53 USD true false false false Pacific Enterprises and Subsidiaries dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi sre_PacificEnterprisesMember dei_LegalEntityAxis explicitMember false false Fair Value us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_EstimateOfFairValueFairValueDisclosureMember us-gaap_FairValueByBalanceSheetGroupingDisclosureItemAmountsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 1034 Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] 2 us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. false 1036 Fair value of financial instruments, Total long-term debt 2 us-gaap_NotesPayableFairValueDisclosure us-gaap true credit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 1393000000 1393 [5] false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 1382000000 1382 [5] false false false xbrli:monetaryItemType monetary This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents notes payable as of the balance sheet date. 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No authoritative reference available. false 1040 Fair value of financial instruments, Preferred stock 2 sre_PreferredStockFairValueDisclosure sre false credit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 66000000 66 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 61000000 61 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 1076 Southern California Gas Company and Subsidiaries 0 na true na na No definition available. false true false false false false false false false false false http://www.sempra.com/role/disclosurefairvaluemeasurementsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 54 USD true false false false Southern California Gas Company and Subsidiaries dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi sre_SouthernCaliforniaGasCompanyMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 55 USD true false false false Southern California Gas Company and Subsidiaries dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi sre_SouthernCaliforniaGasCompanyMember dei_LegalEntityAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ na No definition available. No authoritative reference available. false 1094 Derivative, Fair Value, Gross Amount Not Offset Against Collateral, Net [Abstract] 2 us-gaap_DerivativeFairValueGrossAmountNotOffsetAgainstCollateralNetAbstract us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 1095 Fair value of cash collateral receivables not offset against derivatives 2 us-gaap_DerivativeFairValueGrossAmountNotOffsetAgainstCollateralNet us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 5000000 5 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 5000000 5 false false false xbrli:monetaryItemType monetary The net amount as of the balance sheet date of the fair value of derivative assets and derivative liabilities that in accordance with the entity's accounting policy were not offset against collateral under a master netting arrangement. 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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. false 1103 Interest rate instruments, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisInterestRateInstruments sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 5000000 5 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 8000000 8 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 1104 Commodity contracts subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 5000000 5 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 4000000 4 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 1105 Commodity contracts not subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsNotSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 2000000 2 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 3000000 3 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 1107 Total fair value of assets measured on a recurring basis 2 sre_FairValueAssetsMeasuredOnARecurringBasisTotalAssetsAtFairValue sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 12000000 12 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 15000000 15 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. true 1108 Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items] 2 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisFinancialStatementCaptionsLineItems us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. false 1110 Commodity contracts subject to rate recovery, liabilities 2 sre_FairValueLiabilitiesMeasuredOnARecurringBasisCommodityContractsSubjectToRateRecovery sre false credit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 1000000 1 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. 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No authoritative reference available. false 1147 Commodity contracts subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 4000000 4 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 3000000 3 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 1148 Commodity contracts not subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsNotSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 2000000 2 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 3000000 3 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 1150 Total fair value of assets measured on a recurring basis 2 sre_FairValueAssetsMeasuredOnARecurringBasisTotalAssetsAtFairValue sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 6000000 6 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 6000000 6 false false false xbrli:monetaryItemType monetary No definition available. 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No authoritative reference available. false 1182 Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisFinancialStatementCaptionsLineItems us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. false 1189 Interest rate instruments, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisInterestRateInstruments sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 5000000 5 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 8000000 8 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 1190 Commodity contracts subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 1000000 1 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 1000000 1 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 1191 Commodity contracts not subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsNotSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 1193 Total fair value of assets measured on a recurring basis 2 sre_FairValueAssetsMeasuredOnARecurringBasisTotalAssetsAtFairValue sre false debit instant No definition available. false false false false false false false false false false false totallabel false 1 false true false false 6000000 6 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 9000000 9 false false false xbrli:monetaryItemType monetary No definition available. 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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. false 1232 Interest rate instruments, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisInterestRateInstruments sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 1233 Commodity contracts subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. No authoritative reference available. false 1234 Commodity contracts not subject to rate recovery, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisCommodityContractsNotSubjectToRateRecovery sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. 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No authoritative reference available. true 1248 Southern California Gas Company and Subsidiaries | Collateral Netted 0 na true na na No definition available. false true false false false false false false false false false http://www.sempra.com/role/disclosurefairvaluemeasurementsdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 62 USD true false false false Southern California Gas Company and Subsidiaries dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi sre_SouthernCaliforniaGasCompanyMember dei_LegalEntityAxis explicitMember false false Collateral Netted us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis xbrldi http://xbrl.org/2006/xbrldi sre_CollateralNettedMember us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 63 USD true false false false Southern California Gas Company and Subsidiaries dei_LegalEntityAxis xbrldi http://xbrl.org/2006/xbrldi sre_SouthernCaliforniaGasCompanyMember dei_LegalEntityAxis explicitMember false false Collateral Netted us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis xbrldi http://xbrl.org/2006/xbrldi sre_CollateralNettedMember us-gaap_FairValueAssetsMeasuredOnRecurringBasisDisclosureItemsAxis explicitMember USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 1268 Fair Value, Assets Measured on Recurring Basis, Financial Statement Captions [Line Items] 2 us-gaap_FairValueAssetsMeasuredOnRecurringBasisFinancialStatementCaptionsLineItems us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. false 1275 Interest rate instruments, assets 2 sre_FairValueAssetsMeasuredOnARecurringBasisInterestRateInstruments sre false debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 0 0 false false false xbrli:monetaryItemType monetary No definition available. 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No authoritative reference available. false 1335 Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] 2 us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems us-gaap true na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false xbrli:stringItemType string Line items represent financial concepts included in a table. 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Such securities are reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis. 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