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NUCLEAR PLANT RETIREMENT 2 (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jun. 06, 2013
Nuclear Plant [Line Items]      
Nuclear decommissioning trusts $ 1,131us-gaap_DecommissioningFundInvestments $ 1,034us-gaap_DecommissioningFundInvestments  
Nuclear Plant, SDGE [Member]      
Nuclear Plant [Line Items]      
Nuclear Plant, Ownership Percentage 20.00%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= us-gaap_JointlyOwnedNuclearPowerPlantMember
   
Nuclear Plant, Replacement Power Costs     165sre_NuclearPlantReplacementPowerCosts
/ us-gaap_JointlyOwnedUtilityPlantAxis
= us-gaap_JointlyOwnedNuclearPowerPlantMember
Current Authorized Annual Recovery Amount, Nuclear Decommissioning Trust Funding 8sre_CurrentAuthorizedAnnualRecoveryAmountNuclearDecommissioningTrustFunding
/ us-gaap_JointlyOwnedUtilityPlantAxis
= us-gaap_JointlyOwnedNuclearPowerPlantMember
   
Authorized Annual Recovery Amount Nuclear Decommissioning Trust Funding Future $ 8sre_AuthorizedAnnualRecoveryAmountNuclearDecommissioningTrustFundingFuture
/ us-gaap_JointlyOwnedUtilityPlantAxis
= us-gaap_JointlyOwnedNuclearPowerPlantMember