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RECENT INVESTMENT ACTIVITY 3 (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Recent Investment Activity (Details) [Abstract]    
Property, plant and equipment, net $ 291us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentCurrent  
Inventories 4sre_AssetsHeldForSaleInventory  
Total assets held for sale 295us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent 293us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent [1]
Liability held for sale - asset retirement obligation (6)sre_LiabilityHeldForSaleAssetRetirementObligation [2]  
Total assets held for sale, net $ 289sre_AssetsHeldForSaleNet  
[1]
Derived from audited financial statements.
[2]
Included in Other Current Liabilities on the Condensed Consolidated Balance Sheet.