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GENERAL INFORMATION AND OTHER FINANCIAL DATA - SHAREHOLDER'S EQUITY AND NONCONTROLLING INTEREST (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 04, 2020
$ / shares
shares
Jul. 01, 2020
USD ($)
Jun. 19, 2020
USD ($)
$ / shares
shares
Mar. 30, 2020
USD ($)
Feb. 07, 2019
USD ($)
Aug. 03, 2020
shares
Jul. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
shares
Jul. 06, 2020
USD ($)
shares
Dec. 31, 2019
Dec. 31, 2018
Sep. 11, 2007
USD ($)
shares
Subsidiary, Sale of Stock [Line Items]                                
Stock repurchase program, authorized amount                               $ 2,000,000,000
Stock repurchase program, authorized number of shares (in shares) | shares                               40,000,000
Stock repurchase program, remaining authorized amount               $ 500,000,000     $ 500,000,000          
Stock repurchase program, remaining authorized number of shares (in shares) | shares               12,000,000     12,000,000          
Repurchases of common stock               $ 7,000,000   $ 4,000,000 $ 64,000,000 $ 18,000,000        
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%                        
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               3,694,156   600,000   2,200,000        
Repurchases of common stock               $ 10,000,000 $ 9,000,000 $ 2,000,000   $ 8,000,000        
Sempra Mexico [Member] | Infraestructura Energética Nova [Member]                                
Subsidiary, Sale of Stock [Line Items]                                
Ownership interest (as a percent)               66.80%   66.60% 66.80% 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 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)                     0.7712          
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                          
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]                                
Subsidiary, Sale of Stock [Line Items]                                
Stock repurchase program, authorized amount                         $ 2,000,000,000      
Stock repurchase program, authorized number of shares (in shares) | shares                         25,000,000      
Accelerated share repurchase program, prepaid amount   $ 500,000,000                            
Share repurchase program, number of shares repurchased (in shares) | shares 4,089,375                              
Treasury Stock Acquired, Average Cost Per Share | $ / shares $ 122.27                              
Subsequent Event [Member] | Sempra Mexico [Member] | Infraestructura Energética Nova [Member]                                
Subsidiary, Sale of Stock [Line Items]                                
Common stock repurchased (in shares) | shares           12,604,826                    
Repurchases of common stock             $ 36,000,000                  
Minimum [Member] | 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)                     0.7712          
Maximum [Member] | Series A Preferred Stock [Member] | Sempra Energy [Member]                                
Subsidiary, Sale of Stock [Line Items]                                
Stock price trigger amount | $ / shares                     $ 105.843          
Conversion ratio (in shares)                     0.9448