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INVESTMENTS IN UNCONSOLIDATED ENTITIES (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Solar Projects [Member]
Mar. 31, 2013
Sodigas Sur [Member]
Mar. 31, 2013
Sodigas Pampeana [Member]
Sep. 30, 2014
ConEdison [Member]
Mar. 31, 2013
Sodigas [Member]
Investment In Joint Venture Disclosure [Abstract]                  
Distributions from RBS Sempra Commodities LLP   $ 50              
Investment in RBS Sempra Commodities LLP 73   73            
Equity earnings (losses) related to RBS Commodities 0 0 0 0          
Schedule of Equity Method Investments [Line Items]                  
Sempra Renewables' Equity investments In Joint Ventures 76 5 76 5 109        
Equity Method Investment, Other than Temporary Impairment                 10
Equity Method Investment Other Than Temporary Impairment After Tax                 7
Ownership percentage in equity method investee         50.00% 43.00% 43.00% 50.00%  
Pretax loss on sale of Argentina   (7)              
Aftertax loss on sale of Argentina   (4)              
Equity Method Investments Upon Deconsolidation     (65) (208)          
Proceeds from sale of Argentina   $ 13