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RECENT INVESTMENT ACTIVITY 2 (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 13, 2014
Apr. 09, 2015
Business Acquisition [Line Items]        
Liabilities Assumed $ (2)us-gaap_LiabilitiesAssumed1 $ 0us-gaap_LiabilitiesAssumed1    
Copper Mountain Solar 3 [Member]        
Business Acquisition [Line Items]        
Equity Method Investment Ownership Percentage     50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= sre_CopperMountainSolar3Member
 
Deconsolidation Gain Or Loss Amount After Tax     16sre_DeconsolidationGainOrLossAmountAfterTax
/ us-gaap_BusinessAcquisitionAxis
= sre_CopperMountainSolar3Member
 
Proceeds from sale, net of cash sold     66sre_ProceedsFromSaleOfAssetsAndInvestments
/ us-gaap_BusinessAcquisitionAxis
= sre_CopperMountainSolar3Member
 
Mesquite Power [Member]        
Business Acquisition [Line Items]        
Deconsolidation Gain Or Loss Amount After Tax       34sre_DeconsolidationGainOrLossAmountAfterTax
/ us-gaap_BusinessAcquisitionAxis
= sre_MesquitePowerMember
Proceeds from sale, net of cash sold       345sre_ProceedsFromSaleOfAssetsAndInvestments
/ us-gaap_BusinessAcquisitionAxis
= sre_MesquitePowerMember
Deconsolidation Gain Or Loss Amount       58us-gaap_DeconsolidationGainOrLossAmount
/ us-gaap_BusinessAcquisitionAxis
= sre_MesquitePowerMember
Black Oak Getty Wind [Member]        
Business Acquisition [Line Items]        
Cash consideration (fair value of total consideration) 2us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= sre_BlackOakGettyWindMember
     
Equity Method Investment Ownership Percentage     100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_BusinessAcquisitionAxis
= sre_BlackOakGettyWindMember
 
Contingent payments to acquire a business 6sre_ContingentPaymentsToAcquireBusiness
/ us-gaap_BusinessAcquisitionAxis
= sre_BlackOakGettyWindMember
     
Total business acquisition costs $ 8sre_TotalBusinessAcquisitionCosts
/ us-gaap_BusinessAcquisitionAxis
= sre_BlackOakGettyWindMember