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INVESTMENTS IN UNCONSOLIDATED ENTITIES - NARRATIVE (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
May 16, 2019
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]            
Equity earnings (losses), before income tax:     $ 17 $ (52) $ 24 $ (236)
Maximum exposure under guarantor obligations     3,900   3,900  
Oncor Holdings [Member]            
Schedule of Equity Method Investments [Line Items]            
Contribution     1,236 $ 117 1,236 117
Commitment to invest     $ 1,067   1,067  
R B S Sempra Commodities [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity earnings (losses), before income tax:           65
Corporate Joint Venture [Member] | Sempra Mexico [Member] | IMG [Member]            
Schedule of Equity Method Investments [Line Items]            
Investments made during period           45
Corporate Joint Venture [Member] | Sempra LNG [Member] | Cameron LNG [Member]            
Schedule of Equity Method Investments [Line Items]            
Investments made during period         77 149
Capitalized interest         32 34
Wind Investments [Member] | Sempra Renewables [Member]            
Schedule of Equity Method Investments [Line Items]            
Other-than-temporary impairment   $ 200        
Sempra Energy [Member] | Oncor Holdings [Member]            
Schedule of Equity Method Investments [Line Items]            
Dividends         162 9
Tax sharing payments         $ 9 $ 15
Sharyland Holdings, LP [Member]            
Schedule of Equity Method Investments [Line Items]            
Acquired percentage interest 50.00%          
Investments made during period $ 102