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SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR FUEL DISPOSAL (Details) - San Diego Gas and Electric Company [Member] - USD ($)
$ in Millions
1 Months Ended
Apr. 18, 2016
Jul. 31, 2018
May 31, 2018
Apr. 30, 2018
Mar. 31, 2018
Oct. 31, 2017
May 31, 2017
Feb. 28, 2017
Sep. 30, 2016
May 31, 2016
Total Ownership [Member]                    
Jointly Owned Utility Plant Interests [Line Items]                    
Spent nuclear fuel damages awarded $ 162       $ 44     $ 43    
Filed claims amount     $ 1 $ 1   $ 58     $ 56  
SDG&E Ownership [Member]                    
Jointly Owned Utility Plant Interests [Line Items]                    
Spent nuclear fuel damages awarded         $ 9   $ 9     $ 32
Decrease In SONGS regulatory asset                   23
Decrease In nuclear decommissioning balancing account                   8
Decrease In operation and maintenance cost balancing account                   $ 1
Filed claims amount           $ 12        
Proceeds from settlement   $ 9