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NEW ACCOUNTING STANDARDS - NARRATIVE (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
 [1]
Jan. 01, 2019
Jan. 01, 2018
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative-effect adjustment from change in accounting priniciple   $ (1)       $ 107
Retained earnings $ 10,104 10,147        
Regulatory Liability, Noncurrent 4,016 3,922        
Accumulated other comprehensive income (loss) (764) (626)        
Accounting Standards Update 2016-01 and 2018-03 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative-effect adjustment from change in accounting priniciple         $ 1  
Accounting Standards Update 2017-12 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative-effect adjustment from change in accounting priniciple         $ 3  
San Diego Gas and Electric Company [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative-effect adjustment from change in accounting priniciple           23
Cost of electric fuel and purchased power 1,370 1,293 [1] $ 1,187      
Retained earnings 4,687 4,268        
Regulatory Liability, Noncurrent 2,404 2,225        
Accumulated other comprehensive income (loss) (10) (8)        
Southern California Gas Company [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative-effect adjustment from change in accounting priniciple           $ 15
Retained earnings 3,390 3,040        
Regulatory Liability, Noncurrent 1,612 1,697        
Accumulated other comprehensive income (loss) (20) $ (21)        
Scenario, Forecast [Member] | Accounting Standards Update 2018-02 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Retained earnings       $ 40    
Regulatory Liability, Noncurrent       2    
Accumulated other comprehensive income (loss)       42    
Scenario, Forecast [Member] | San Diego Gas and Electric Company [Member] | Accounting Standards Update 2018-02 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Retained earnings       2    
Accumulated other comprehensive income (loss)       2    
Scenario, Forecast [Member] | Southern California Gas Company [Member] | Accounting Standards Update 2018-02 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Retained earnings       2    
Regulatory Liability, Noncurrent       2    
Accumulated other comprehensive income (loss)       $ 4    
Assets Held under Capital Leases [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cost of electric fuel and purchased power $ 117          
[1] As adjusted for the retrospective adoption of ASU 2017-07, which we discuss in Note 2, and a reclassification to conform to current year presentation, which we discuss in Note 1.