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EMPLOYEE BENEFIT PLANS PART 6 (Details)
12 Months Ended
Dec. 31, 2014
Domestic Equity [Member]  
Defined Benefit Plan Assets Target Allocations [Line Items]  
Defined Benefit Plan Assets Target Allocations Percentage 38.00%sre_DefinedBenefitPlanAssetsTargetAllocationsPercentage
/ sre_DefinedBenefitPlanAssetsTargetAllocationsAxis
= sre_DomesticEquityMember
International Equity [Member]  
Defined Benefit Plan Assets Target Allocations [Line Items]  
Defined Benefit Plan Assets Target Allocations Percentage 26.00%sre_DefinedBenefitPlanAssetsTargetAllocationsPercentage
/ sre_DefinedBenefitPlanAssetsTargetAllocationsAxis
= sre_InternationalEquityMember
High Yield Credit [Member]  
Defined Benefit Plan Assets Target Allocations [Line Items]  
Defined Benefit Plan Assets Target Allocations Percentage 5.00%sre_DefinedBenefitPlanAssetsTargetAllocationsPercentage
/ sre_DefinedBenefitPlanAssetsTargetAllocationsAxis
= sre_HighYieldCreditMember
Long Credit [Member]  
Defined Benefit Plan Assets Target Allocations [Line Items]  
Defined Benefit Plan Assets Target Allocations Percentage 18.00%sre_DefinedBenefitPlanAssetsTargetAllocationsPercentage
/ sre_DefinedBenefitPlanAssetsTargetAllocationsAxis
= sre_LongCreditMember
Real Assets [Member]  
Defined Benefit Plan Assets Target Allocations [Line Items]  
Defined Benefit Plan Assets Target Allocations Percentage 5.00%sre_DefinedBenefitPlanAssetsTargetAllocationsPercentage
/ sre_DefinedBenefitPlanAssetsTargetAllocationsAxis
= sre_RealAssetsMember
STRIPS [Member]  
Defined Benefit Plan Assets Target Allocations [Line Items]  
Defined Benefit Plan Assets Target Allocations Percentage 4.00%sre_DefinedBenefitPlanAssetsTargetAllocationsPercentage
/ sre_DefinedBenefitPlanAssetsTargetAllocationsAxis
= sre_StripsMember
LongGovernment [Member]  
Defined Benefit Plan Assets Target Allocations [Line Items]  
Defined Benefit Plan Assets Target Allocations Percentage 4.00%sre_DefinedBenefitPlanAssetsTargetAllocationsPercentage
/ sre_DefinedBenefitPlanAssetsTargetAllocationsAxis
= sre_LonggovernmentMember