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DERIVATIVE FINANCIAL INSTRUMENTS 6 (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Derivative Credit Risk Related Contingent Features [Line Items]    
Derivative, Net Liability Position, Aggregate Fair Value $ 7us-gaap_DerivativeNetLiabilityPositionAggregateFairValue $ 9us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
Additional Collateral Aggregate Fair Value 7us-gaap_AdditionalCollateralAggregateFairValue  
San Diego Gas and Electric Company [Member]    
Derivative Credit Risk Related Contingent Features [Line Items]    
Derivative, Net Liability Position, Aggregate Fair Value 4us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember		 2us-gaap_DerivativeNetLiabilityPositionAggregateFairValue
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember
Additional Collateral Aggregate Fair Value $ 4us-gaap_AdditionalCollateralAggregateFairValue
/ dei_LegalEntityAxis
= sre_SanDiegoGasAndElectricCompanyMember