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GENERAL INFORMATION AND OTHER FINANCIAL DATA - OTHER NONCONTROLLING INTERESTS (Details) - USD ($)
$ in Millions
3 Months Ended
Feb. 07, 2019
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Noncontrolling Interest [Line Items]        
Repurchases of common stock   $ 14 $ 19  
Other noncontrolling interests   $ 2,104   $ 2,090 [1]
Infraestructura Energética Nova [Member]        
Noncontrolling Interest [Line Items]        
Common stock repurchased (in shares)   1,600,000    
Repurchases of common stock   $ 6    
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%
Other noncontrolling interests   $ 102   $ 100
Sempra Mexico [Member] | IEnova [Member]        
Noncontrolling Interest [Line Items]        
Percent ownership held by noncontrolling interests   33.40%   33.50%
Other noncontrolling interests   $ 1,611   $ 1,592
Sempra Mexico [Member] | Ownership Interests Held By Others, IEnova, Subsidiary One [Member]        
Noncontrolling Interest [Line Items]        
Other noncontrolling interests   $ 13   $ 13
Sempra Mexico [Member] | Ownership Interests Held By Others, IEnova, Subsidiary One [Member] | Minimum [Member]        
Noncontrolling Interest [Line Items]        
Percent ownership held by noncontrolling interests   10.00%   10.00%
Sempra Mexico [Member] | Ownership Interests Held By Others, IEnova, Subsidiary One [Member] | Maximum [Member]        
Noncontrolling Interest [Line Items]        
Percent ownership held by noncontrolling interests   47.60%   49.00%
Sempra Renewables [Member] | Tax equity arrangement – wind [Member]        
Noncontrolling Interest [Line Items]        
Other noncontrolling interests   $ 161   $ 158
Sempra Renewables [Member] | PXISE Energy Solutions LLC [Member]        
Noncontrolling Interest [Line Items]        
Percent ownership held by noncontrolling interests   11.10%   11.10%
Other noncontrolling interests   $ 0   $ 1
Sempra LNG [Member] | Bay Gas Storage Company, Ltd. [Member]        
Noncontrolling Interest [Line Items]        
Percent ownership held by noncontrolling interests   0.00%   9.10%
Other noncontrolling interests   $ 0   $ 18
Sempra LNG [Member] | Liberty Gas Storage, LLC [Member]        
Noncontrolling Interest [Line Items]        
Percent ownership held by noncontrolling interests   24.60%   24.60%
Other noncontrolling interests   $ (12)   $ (12)
Sempra South American Utilities [Member] | Chilquinta Energía subsidiaries [Member]        
Noncontrolling Interest [Line Items]        
Other noncontrolling interests   $ 24   $ 23
Sempra South American Utilities [Member] | Chilquinta Energía subsidiaries [Member] | Minimum [Member]        
Noncontrolling Interest [Line Items]        
Percent ownership held by noncontrolling interests   19.70%   19.70%
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%
Other noncontrolling interests   $ 201   $ 193
Sempra South American Utilities [Member] | Tecsur [Member]        
Noncontrolling Interest [Line Items]        
Percent ownership held by noncontrolling interests   9.80%   9.80%
Other noncontrolling interests   $ 4   $ 4
Infraestructura Energética Nova [Member]        
Noncontrolling Interest [Line Items]        
Ownership interest   66.60%   66.50%
Bay Gas [Member] | Sempra LNG [Member]        
Noncontrolling Interest [Line Items]        
Payment to acquire remaining interest in Bay Gas $ 20      
Sale of interest 100.00%      
[1] Derived from audited financial statements.