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SAN ONOFRE NUCLEAR GENERATING STATION (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Jointly Owned Utility Plant Interests [Line Items]    
Anticipated term of dismantlement work 10 years  
San Diego Gas and Electric Company [Member]    
Jointly Owned Utility Plant Interests [Line Items]    
Percent of dismantlement work expense (as a percent) 20.00%  
ARO related to decommissioning costs $ 563  
Cost study estimate decommissioning escalated $ 886  
Jointly Owned Nuclear Power Plant [Member] | San Diego Gas and Electric Company [Member]    
Jointly Owned Utility Plant Interests [Line Items]    
Jointly owned utility plant, proportionate ownership share (as a percent) 20.00%  
SONGS 2 and 3 Decommissioning [Member] | San Diego Gas and Electric Company [Member]    
Jointly Owned Utility Plant Interests [Line Items]    
Nuclear decommissioning trust authorized withdrawal amount   $ 89