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CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Property, plant and equipment related to VIE $ 403sre_VariableInterestEntitiesConsolidatedCarryingAmountNetPropertyPlantAndEquipment $ 410sre_VariableInterestEntitiesConsolidatedCarryingAmountNetPropertyPlantAndEquipment
Long-term debt related to VIE 312sre_VariableInterestEntitiesConsolidatedCarryingAmountLongTermDebt 315sre_VariableInterestEntitiesConsolidatedCarryingAmountLongTermDebt
Shareholders' equity:    
Preferred stock, shares authorized 50us-gaap_PreferredStockSharesAuthorized 50us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common stock, shares authorized 750us-gaap_CommonStockSharesAuthorized 750us-gaap_CommonStockSharesAuthorized
Common stock, shares outstanding 247us-gaap_CommonStockSharesOutstanding 246us-gaap_CommonStockSharesOutstanding
San Diego Gas and Electric Company [Member]    
Property, plant and equipment related to VIE 403sre_VariableInterestEntitiesConsolidatedCarryingAmountNetPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
410sre_VariableInterestEntitiesConsolidatedCarryingAmountNetPropertyPlantAndEquipment
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Long-term debt related to VIE $ 312sre_VariableInterestEntitiesConsolidatedCarryingAmountLongTermDebt
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
$ 315sre_VariableInterestEntitiesConsolidatedCarryingAmountLongTermDebt
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Shareholders' equity:    
Common stock, shares authorized 255us-gaap_CommonStockSharesAuthorized
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
255us-gaap_CommonStockSharesAuthorized
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Common stock, shares outstanding 117us-gaap_CommonStockSharesOutstanding
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
117us-gaap_CommonStockSharesOutstanding
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Southern California Gas Company [Member]    
Shareholders' equity:    
Common stock, shares authorized 100us-gaap_CommonStockSharesAuthorized
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
100us-gaap_CommonStockSharesAuthorized
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
Common stock, shares outstanding 91us-gaap_CommonStockSharesOutstanding
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember
91us-gaap_CommonStockSharesOutstanding
/ dei_LegalEntityAxis
= sre_SouthernCaliforniaGasCompanyMember