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SAN ONOFRE NUCLEAR GENERATING STATION (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Jan. 31, 2019
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 20.00%  
Nuclear decommissioning trust authorized withdrawal amount $ 455 $ 93
ARO related to decommissioning costs 614  
Cost study estimate decommissioning escalated $ 834  
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 20.00%