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REGULATORY MATTERS - COST OF CAPITAL & FERC RATES (Details) - USD ($)
$ in Millions
12 Months Ended 24 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Jan. 01, 2019
San Diego Gas and Electric Company [Member]        
Public Utilities, General Disclosures [Line Items]        
Transmission owner, formula rate revenue requirement increase   $ 88    
Transmission owner, formula rate revenue requirement increase percentage   10.60%    
San Diego Gas and Electric Company [Member] | California Public Utilities Commission [Member]        
Public Utilities, General Disclosures [Line Items]        
Weighted return on rate base   7.79%    
Cost of debt   5.00%    
San Diego Gas and Electric Company [Member] | Federal Energy Regulatory Commission [Member]        
Public Utilities, General Disclosures [Line Items]        
Weighting   100.00%    
Weighted return on rate base   7.51%    
San Diego Gas and Electric Company [Member] | Scenario, Forecast [Member]        
Public Utilities, General Disclosures [Line Items]        
Transmission owner, formula rate revenue requirement $ 911      
Minimum common equity ratio       11.20%
San Diego Gas and Electric Company [Member] | Scenario, Forecast [Member] | California Public Utilities Commission [Member]        
Public Utilities, General Disclosures [Line Items]        
Weighted return on rate base     7.55%  
Authorized weighting     100.00%  
Cost of debt     4.59%  
Change in cost of debt     (0.41%)  
Change in return on rate base     (0.24%)  
San Diego Gas and Electric Company [Member] | Capital Structure, Long Term Debt [Member] | Federal Energy Regulatory Commission [Member]        
Public Utilities, General Disclosures [Line Items]        
Weighting   43.44%    
Return on rate base   4.21%    
Weighted return on rate base   1.83%    
San Diego Gas and Electric Company [Member] | Capital Structure, Long Term Debt [Member] | Scenario, Forecast [Member] | California Public Utilities Commission [Member]        
Public Utilities, General Disclosures [Line Items]        
Authorized weighting     45.25%  
Return on rate base     4.59%  
Weighted return on rate base     2.08%  
San Diego Gas and Electric Company [Member] | Capital Structure, Preferred Stock [Member] | Scenario, Forecast [Member] | California Public Utilities Commission [Member]        
Public Utilities, General Disclosures [Line Items]        
Authorized weighting     2.75%  
Return on rate base     6.22%  
Weighted return on rate base     0.17%  
San Diego Gas and Electric Company [Member] | Capital Structure, Common Equity [Member] | Federal Energy Regulatory Commission [Member]        
Public Utilities, General Disclosures [Line Items]        
Weighting   56.56%    
Return on rate base   10.05%    
Weighted return on rate base   5.68%    
San Diego Gas and Electric Company [Member] | Capital Structure, Common Equity [Member] | Scenario, Forecast [Member] | California Public Utilities Commission [Member]        
Public Utilities, General Disclosures [Line Items]        
Authorized weighting     52.00%  
Return on rate base     10.20%  
Weighted return on rate base     5.30%  
Southern California Gas Company [Member] | California Public Utilities Commission [Member]        
Public Utilities, General Disclosures [Line Items]        
Weighted return on rate base   8.02%    
Cost of debt   5.77%    
Southern California Gas Company [Member] | Scenario, Forecast [Member] | California Public Utilities Commission [Member]        
Public Utilities, General Disclosures [Line Items]        
Weighted return on rate base     7.34%  
Authorized weighting     100.00%  
Cost of debt     4.33%  
Change in cost of debt     (1.44%)  
Change in return on rate base     (0.68%)  
Southern California Gas Company [Member] | Capital Structure, Long Term Debt [Member] | Scenario, Forecast [Member] | California Public Utilities Commission [Member]        
Public Utilities, General Disclosures [Line Items]        
Authorized weighting     45.60%  
Return on rate base     4.33%  
Weighted return on rate base     1.97%  
Southern California Gas Company [Member] | Capital Structure, Preferred Stock [Member] | Scenario, Forecast [Member] | California Public Utilities Commission [Member]        
Public Utilities, General Disclosures [Line Items]        
Authorized weighting     2.40%  
Return on rate base     6.00%  
Weighted return on rate base     0.14%  
Southern California Gas Company [Member] | Capital Structure, Common Equity [Member] | Scenario, Forecast [Member] | California Public Utilities Commission [Member]        
Public Utilities, General Disclosures [Line Items]        
Authorized weighting     52.00%  
Return on rate base     10.05%  
Weighted return on rate base     5.23%  
Sempra Mexico [Member]        
Public Utilities, General Disclosures [Line Items]        
Regulatory assets   $ 7