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GENERAL INFORMATION AND OTHER FINANCIAL DATA - SHAREHOLDER'S EQUITY AND NONCONTROLLING INTEREST (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 04, 2020
$ / shares
shares
Jul. 01, 2020
USD ($)
Jun. 19, 2020
USD ($)
$ / shares
shares
Mar. 30, 2020
USD ($)
Feb. 07, 2019
USD ($)
Nov. 05, 2020
USD ($)
shares
Sep. 30, 2020
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Jul. 06, 2020
USD ($)
shares
Dec. 31, 2019
Dec. 31, 2018
Sep. 11, 2007
USD ($)
shares
Subsidiary, Sale of Stock [Line Items]                              
Issuances of common stock                   $ 10,000,000 $ 757,000,000        
Stock repurchase program, authorized amount                       $ 2,000,000,000     $ 2,000,000,000
Stock repurchase program, authorized number of shares (in shares) | shares                       25,000,000     40,000,000
Accelerated share repurchase program, prepaid amount   $ 500,000,000                          
Share repurchase program, number of shares repurchased (in shares) | shares 4,089,375                            
Common stock repurchased, average price (in dollars per share) | $ / shares $ 122.27                            
Repurchases of common stock             $ 501,000,000   $ 5,000,000 565,000,000 $ 23,000,000        
Equitization of long-term debt for deficit held by NCI                   $ 22,000,000          
LA Storage [Member] | Liberty Gas Storage, LLC [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Percent ownership held by noncontrolling interests       100.00%                      
Chilquinta Energía subsidiaries [Member] | Discontinued Operations, Held-for-sale [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Percent ownership held by noncontrolling interests             0.00%     0.00%          
Luz del Sur [Member] | Discontinued Operations, Held-for-sale [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Percent ownership held by noncontrolling interests             0.00%     0.00%     16.40%    
Liberty Gas Storage, LLC [Member] | Sempra LNG [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Payment to acquire remaining interest in Bay Gas       $ 7,000,000                      
Equitization of long-term debt for deficit held by NCI       22,000,000                      
Increase from equity of noncontrolling interest       $ 2,000,000                      
Bay Gas [Member] | Sempra LNG [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Payment to acquire remaining interest in Bay Gas         $ 20,000,000                    
Sale of interest         100.00%                    
Sempra Mexico [Member] | Infraestructura Energética Nova [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Common stock repurchased (in shares) | shares                   57,547,381 2,620,000        
Repurchases of common stock               $ 9,000,000   $ 167,000,000 $ 10,000,000        
Sempra Mexico [Member] | Infraestructura Energética Nova [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Ownership interest (as a percent)             69.20%   66.60% 69.20% 66.60%   66.60% 66.50%  
Sempra Mexico [Member] | ICM Ventures Holdings B.V. [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Ownership interest (as a percent)               82.50%         53.70%    
Sempra Mexico [Member] | IEnova subsidiaries [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Percent ownership held by noncontrolling interests             17.50%     17.50%          
Sempra Mexico [Member] | IEnova [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Percent ownership held by noncontrolling interests             30.80%     30.80%     33.40%    
Sempra LNG [Member] | Infraestructura Energética Nova [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Percent ownership held by noncontrolling interests             50.00%     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%     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%     100.00%          
Series A Preferred Stock [Member] | Sempra Energy [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Stock price trigger amount | $ / shares                   $ 129.668          
Conversion ratio (in shares)                   0.9448          
Conversion price | $ / shares             $ 100.00     $ 100.00          
Series C Preferred Stock [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Preferred stock, shares issued (in shares) | shares     900,000                        
Preferred stock, fixed rate (as a percent) | $ / shares     $ 0.04875                        
Preferred stock, redemption price per share (in dollars per share) | $ / shares     $ 1,000                        
Proceeds from issuance of preferred stock     $ 889,000,000                        
Preferred stock, discount     11,000,000                        
Preferred stock, liquidation preference     $ 1,000                        
Common Stock [Member] | Settlement of Forward Sale Contracts [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Issuances of common stock                 $ 728,000,000            
Underwriting discounts and equity issuance costs                 $ 13,000,000            
Shares issued (in shares) | shares                 7,156,185            
Share price (in dollars per share) | $ / shares                 $ 101.74   $ 101.74        
At Occurrence of Ratings Event | Series C Preferred Stock [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Preferred stock, redemption price per share (in dollars per share) | $ / shares     $ 1,020                        
Preferred stock, liquidation preference price per share (as a percent)     102.00%                        
Prior to October 15, 2025 | Series C Preferred Stock [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Preferred stock, dividend rate (as a percent)     4.875%                        
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares     $ 1,000                        
On and after October 15 2025 | Series C Preferred Stock [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Preferred stock, dividend rate (as a percent)     4.55%                        
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares     $ 1,000                        
Subsequent Event [Member] | Sempra Mexico [Member] | Infraestructura Energética Nova [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Common stock repurchased (in shares) | shares           19,575,399                  
Repurchases of common stock           $ 64,000,000                  
Minimum [Member] | Chilquinta Energía subsidiaries [Member] | Discontinued Operations, Held-for-sale [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Percent ownership held by noncontrolling interests                         19.70%    
Minimum [Member] | Sempra Mexico [Member] | IEnova subsidiaries [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Percent ownership held by noncontrolling interests                         10.00%    
Minimum [Member] | Series A Preferred Stock [Member] | Sempra Energy [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Stock price trigger amount | $ / shares                   $ 105.8425          
Conversion ratio (in shares)                   0.7712          
Maximum [Member] | Chilquinta Energía subsidiaries [Member] | Discontinued Operations, Held-for-sale [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Percent ownership held by noncontrolling interests                         43.40%    
Maximum [Member] | Sempra Mexico [Member] | IEnova subsidiaries [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Percent ownership held by noncontrolling interests                         46.30%    
Maximum [Member] | Series A Preferred Stock [Member] | Sempra Energy [Member]                              
Subsidiary, Sale of Stock [Line Items]                              
Stock price trigger amount | $ / shares                   $ 105.8425          
Conversion ratio (in shares)                   0.9448