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GENERAL INFORMATION AND OTHER FINANCIAL DATA - SHAREHOLDER'S EQUITY AND NONCONTROLLING INTEREST (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 02, 2019
Feb. 07, 2019
Jul. 31, 2018
Jan. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Jul. 13, 2018
Jan. 09, 2018
Subsidiary, Sale of Stock [Line Items]                      
Proceeds from issuance             $ 0 $ 1,693      
Proceeds from issuance             20 2,090      
Repurchases of common stock         $ 4 $ 1 $ 18 $ 20      
Public Offering [Member] | Common Stock [Member]                      
Subsidiary, Sale of Stock [Line Items]                      
Shares issued (in shares)     11,212,500 26,869,158              
Shares issued (in usd per share)     $ 113.75 $ 107.00              
Shares issued net of underwriting discount (in usd per share)     $ 111.87 $ 105.07              
Proceeds from issuance       $ 1,270              
Over-Allotment Option [Member] | Common Stock [Member]                      
Subsidiary, Sale of Stock [Line Items]                      
Proceeds from issuance     $ 164 $ 367              
Settlement of Forward Sale Contracts [Member] | Common Stock [Member]                      
Subsidiary, Sale of Stock [Line Items]                      
Proceeds from issuance           $ 800          
Sempra Energy [Member] | Series A Preferred Stock [Member]                      
Subsidiary, Sale of Stock [Line Items]                      
Shares issued (in shares)       17,250,000              
Proceeds from issuance       $ 1,690              
Liquidation price (in usd per share)                     $ 100.00
Sempra Energy [Member] | Series B Preferred Stock [Member]                      
Subsidiary, Sale of Stock [Line Items]                      
Shares issued (in shares)     5,750,000                
Proceeds from issuance     $ 565                
Liquidation price (in usd per share)                   $ 100.00  
Infraestructura Energética Nova [Member]                      
Subsidiary, Sale of Stock [Line Items]                      
Common stock repurchased (in shares)             2,200,000        
Repurchases of common stock             $ 8        
Subsequent Event [Member] | Settlement of Forward Sale Contracts [Member] | Common Stock [Member]                      
Subsidiary, Sale of Stock [Line Items]                      
Shares issuable under forward contracts 16,906,185                    
Infraestructura Energética Nova [Member]                      
Subsidiary, Sale of Stock [Line Items]                      
Ownership interest         66.60%   66.60%   66.50%    
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 LNG [Member] | Bay Gas Storage Company, Ltd. [Member]                      
Subsidiary, Sale of Stock [Line Items]                      
Percent ownership held by noncontrolling interests         0.00%   0.00%   9.10%