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INCOME TAXES 4 (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Valuation Allowance [Line Items]    
Deferred Tax Assets, Valuation Allowance $ 39us-gaap_DeferredTaxAssetsValuationAllowance $ 96us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Asset Valuation Allowance, Variable Interest Entities [Member]    
Valuation Allowance [Line Items]    
Deferred Tax Assets, Valuation Allowance 48us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= sre_DeferredTaxAssetValuationAllowanceVariableInterestEntitiesMember
60us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= sre_DeferredTaxAssetValuationAllowanceVariableInterestEntitiesMember
Deferred Tax Asset Valuation Allowance, Foreign Net Operating Losses [Member]    
Valuation Allowance [Line Items]    
Deferred Tax Assets, Valuation Allowance 8us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= sre_DeferredTaxAssetValuationAllowanceForeignNetOperatingLossesMember
12us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= sre_DeferredTaxAssetValuationAllowanceForeignNetOperatingLossesMember
Deferred Tax Asset Valuation Allowance, Federal State And Local Net Operating Losses [Member]    
Valuation Allowance [Line Items]    
Deferred Tax Assets, Valuation Allowance $ 31us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= sre_DeferredTaxAssetValuationAllowanceFederalStateAndLocalNetOperatingLossesMember
$ 84us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= sre_DeferredTaxAssetValuationAllowanceFederalStateAndLocalNetOperatingLossesMember