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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
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       $ 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        
Subsequent Event [Member] | Total Ownership [Member]                
Jointly Owned Utility Plant Interests [Line Items]                
Filed claims amount   $ 1