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OTHER FINANCIAL DATA - OTHER NONCONTROLLING INTERESTS (Details) - USD ($)
$ in Millions
1 Months Ended
Nov. 30, 2017
Oct. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Noncontrolling Interest [Line Items]        
Noncontrolling interests     $ 2,217 $ 2,270 [1]
San Diego Gas and Electric Company [Member] | Otay Mesa VIE [Member]        
Noncontrolling Interest [Line Items]        
Percent ownership held by noncontrolling interests     100.00% 100.00%
Noncontrolling interests     $ 35 $ 37
Sempra South American Utilities [Member] | Chilquinta Energía subsidiaries [Member]        
Noncontrolling Interest [Line Items]        
Noncontrolling interests     $ 23 $ 22
Sempra South American Utilities [Member] | Chilquinta Energía subsidiaries [Member] | Minimum [Member]        
Noncontrolling Interest [Line Items]        
Percent ownership held by noncontrolling interests     22.90% 23.10%
Sempra South American Utilities [Member] | Chilquinta Energía subsidiaries [Member] | Maximum [Member]        
Noncontrolling Interest [Line Items]        
Percent ownership held by noncontrolling interests     43.40% 43.40%
Sempra South American Utilities [Member] | Luz del Sur [Member]        
Noncontrolling Interest [Line Items]        
Percent ownership held by noncontrolling interests     16.40% 16.40%
Noncontrolling interests     $ 185 $ 173
Sempra South American Utilities [Member] | Tecsur [Member]        
Noncontrolling Interest [Line Items]        
Percent ownership held by noncontrolling interests     9.80% 9.80%
Noncontrolling interests     $ 4 $ 4
Sempra Mexico [Member] | IEnova [Member]        
Noncontrolling Interest [Line Items]        
Percent ownership held by noncontrolling interests     33.60% 33.60%
Noncontrolling interests     $ 1,483 $ 1,524
Sempra Renewables [Member] | Tax equity arrangement – wind [Member]        
Noncontrolling Interest [Line Items]        
Noncontrolling interests     91 92
Sempra Renewables [Member] | Tax equity arrangement – solar [Member]        
Noncontrolling Interest [Line Items]        
Noncontrolling interests     $ 354 $ 376
Sempra LNG & Midstream [Member] | Bay Gas Storage Company, Ltd. [Member]        
Noncontrolling Interest [Line Items]        
Percent ownership held by noncontrolling interests     9.10% 9.10%
Noncontrolling interests     $ 28 $ 27
Sempra LNG & Midstream [Member] | Liberty Gas Storage, LLC [Member]        
Noncontrolling Interest [Line Items]        
Percent ownership held by noncontrolling interests     23.30% 23.30%
Noncontrolling interests     $ 14 $ 14
Sempra LNG & Midstream [Member] | Southern Gas Transmission Company [Member]        
Noncontrolling Interest [Line Items]        
Percent ownership held by noncontrolling interests     0.00% 49.00%
Noncontrolling interests     $ 0 $ 1
Forecast [Member] | Sempra Renewables [Member] | Minimum [Member]        
Noncontrolling Interest [Line Items]        
Proceeds from issuance of private placement $ 90      
Forecast [Member] | Sempra Renewables [Member] | Maximum [Member]        
Noncontrolling Interest [Line Items]        
Proceeds from issuance of private placement $ 100      
Subsequent Event [Member] | Sempra Renewables [Member]        
Noncontrolling Interest [Line Items]        
Proceeds from issuance of private placement   $ 39    
[1] Derived from audited financial statements.