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GENERAL INFORMATION AND OTHER FINANCIAL DATA - SHAREHOLDER'S EQUITY AND NONCONTROLLING INTEREST (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 30, 2020
Feb. 07, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items]            
Repurchases of common stock     $ 57 $ 14    
Equitization of long-term debt for deficit held by NCI     22      
LA Storage [Member] | Liberty Gas Storage, LLC [Member]            
Subsidiary, Sale of Stock [Line Items]            
Percent ownership held by noncontrolling interests 100.00%          
Liberty Gas Storage, LLC [Member] | Sempra LNG [Member]            
Subsidiary, Sale of Stock [Line Items]            
Payment to acquire remaining interest in Bay Gas $ 7          
Equitization of long-term debt for deficit held by NCI 22          
Stockholders Equity, Increase From Equity of Noncontrolling Interest $ 2          
Bay Gas [Member] | Sempra LNG [Member]            
Subsidiary, Sale of Stock [Line Items]            
Payment to acquire remaining interest in Bay Gas   $ 20        
Sale of interest   100.00%        
Sempra Mexico [Member] | Infraestructura Energética Nova [Member]            
Subsidiary, Sale of Stock [Line Items]            
Common stock repurchased (in shares)       1,600,000    
Repurchases of common stock     $ 9 $ 6    
Sempra Mexico [Member] | Infraestructura Energética Nova [Member]            
Subsidiary, Sale of Stock [Line Items]            
Ownership interest (as a percent)     82.50% 66.60% 53.70% 66.50%
Sempra LNG [Member] | Infraestructura Energética Nova [Member]            
Subsidiary, Sale of Stock [Line Items]            
Percent ownership held by noncontrolling interests     50.00%      
Sempra LNG [Member] | Liberty Gas Storage, LLC [Member]            
Subsidiary, Sale of Stock [Line Items]            
Percent ownership held by noncontrolling interests 24.60%   0.00%   24.60%  
Sempra LNG [Member] | Ownership Interests Held By Others, Bay Gas Storage Company [Member]            
Subsidiary, Sale of Stock [Line Items]            
Percent ownership held by noncontrolling interests         9.10%  
Sempra LNG [Member] | Liberty Gas Storage, LLC [Member] | Liberty Gas Storage, LLC [Member]            
Subsidiary, Sale of Stock [Line Items]            
Percent ownership held by noncontrolling interests     100.00%