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OTHER FINANCIAL DATA - NONCONTROLLING INTERESTS 2 (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2012
Dec. 10, 2014
Nov. 26, 2012
Oct. 31, 2012
Purchase of Noncontrolling Interests [Line Items]          
Business Acquisition, Percentage of Voting Interests Acquired   100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired      
Business Acquisition Cash Paid Net Of Cash Acquired $ 121sre_BusinessAcquisitionCashPaidNetOfCashAcquired        
Luz Del Sur [Member]          
Purchase of Noncontrolling Interests [Line Items]          
Business Combination Step Acquisition Equity Interest In Acquiree Percentage     79.80%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage
/ sre_PurchaseOfNoncontrollingInterestsAxisAxis
= sre_LuzDelSurMember		    
Business Acquisition, Percentage of Voting Interests Acquired     83.60%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ sre_PurchaseOfNoncontrollingInterestsAxisAxis
= sre_LuzDelSurMember		    
Luzlinares [Member]          
Purchase of Noncontrolling Interests [Line Items]          
Business Combination Step Acquisition Equity Interest In Acquiree Percentage         85.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireePercentage
/ sre_PurchaseOfNoncontrollingInterestsAxisAxis
= sre_LuzlinaresMember
Business Acquisition, Percentage of Voting Interests Acquired       15.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ sre_PurchaseOfNoncontrollingInterestsAxisAxis
= sre_LuzlinaresMember