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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 9 Months Ended 21 Months Ended
Nov. 01, 2019
Feb. 07, 2019
Jul. 31, 2018
Jan. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Dec. 31, 2018
Jul. 13, 2018
Jan. 09, 2018
Subsidiary, Sale of Stock [Line Items]                            
Proceeds from issuance                 $ 0 $ 2,259        
Proceeds from issuance                 757 2,261        
Repurchases of common stock         $ 5       $ 23 $ 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                     $ 2,800      
Over-Allotment Option [Member] | Common Stock [Member]                            
Subsidiary, Sale of Stock [Line Items]                            
Shares issued (in shares)           1,462,500   3,504,672            
Proceeds from issuance           $ 164   $ 367            
Underwriting discounts and equity issuance costs           $ 3   $ 8            
Settlement of Forward Sale Contracts [Member] | Common Stock [Member]                            
Subsidiary, Sale of Stock [Line Items]                            
Shares issued (in shares)         7,156,185   7,651,671 8,556,630            
Proceeds from issuance         $ 728   $ 800 $ 900            
Underwriting discounts and equity issuance costs         $ 13   $ 14 $ 16            
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)                 2,620,000          
Repurchases of common stock                 $ 10          
Subsequent Event [Member] | Settlement of Forward Sale Contracts [Member] | Common Stock [Member]                            
Subsidiary, Sale of Stock [Line Items]                            
Shares issuable under forward contracts 9,750,000                          
Infraestructura Energética Nova [Member]                            
Subsidiary, Sale of Stock [Line Items]                            
Ownership interest         66.60%       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] | Ownership Interests Held By Others, Bay Gas Storage Company [Member]                            
Subsidiary, Sale of Stock [Line Items]                            
Percent ownership held by noncontrolling interests         0.00%       0.00%   0.00% 9.10%