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SAN ONOFRE NUCLEAR GENERATING STATION (SONGS) - NARRATIVE (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Mar. 13, 2017
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2017
Dec. 19, 2017
Feb. 28, 2017
Jointly Owned Utility Plant Interests [Line Items]                
Litigation settlement payable $ 118              
Percent of arbitration expenses awarded 95.00%              
Settlement payable net of arbitration expense $ 60              
Regulatory asset, current     $ 138     $ 325    
Regulatory asset, noncurrent     $ 1,589     1,517    
Period of environmental exit     10 years          
San Diego Gas and Electric Company [Member]                
Jointly Owned Utility Plant Interests [Line Items]                
Litigation settlement payable 24              
Settlement payable net of arbitration expense 12              
Arbitration expense 12              
Legal fees 11              
Litigation settlement amount allocated to ratepayers and shareholders $ 1              
Regulatory asset threshold to cease rate recovery             $ 152  
Regulatory asset, current     $ 123     316    
Regulatory asset, noncurrent     $ 454     $ 451    
Percentage of environmental exit costs incurred     20.00%          
SONGS mitigation costs remaining     $ 23          
Nuclear decommissioning trust authorized withdrawal amount     455         $ 93
San Diego Gas and Electric Company [Member] | Nuclear Plant Closure [Member]                
Jointly Owned Utility Plant Interests [Line Items]                
Regulatory asset threshold to cease rate recovery             $ 775  
Receivable for nuclear plant closure     124          
Regulatory asset, current     40          
Regulatory asset, noncurrent     $ 84          
San Diego Gas and Electric Company [Member] | San Onofre Nuclear Generating Station (SONGS) [Member]                
Jointly Owned Utility Plant Interests [Line Items]                
Ownership percentage     20.00%          
SONGS 1 Decommissioning [Member]                
Jointly Owned Utility Plant Interests [Line Items]                
SONGS mitigation costs remaining   $ 207            
SONGS 1 Decommissioning [Member] | San Diego Gas and Electric Company [Member]                
Jointly Owned Utility Plant Interests [Line Items]                
SONGS mitigation costs remaining   41            
Environmental exit costs deemed reasonable   3            
SONGS 2 and 3 Decommissioning [Member]                
Jointly Owned Utility Plant Interests [Line Items]                
SONGS mitigation costs remaining   3,200            
Environmental exit costs deemed reasonable       $ 222 $ 136      
SONGS 2 and 3 Decommissioning [Member] | San Diego Gas and Electric Company [Member]                
Jointly Owned Utility Plant Interests [Line Items]                
SONGS mitigation costs remaining   638            
Environmental exit costs deemed reasonable   $ 43