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SAN ONOFRE NUCLEAR GENERATING STATION (SONGS) - NUCLEAR INSURANCE (Details) - San Diego Gas and Electric Company [Member] - USD ($)
$ in Millions
Dec. 31, 2018
Apr. 05, 2018
Jan. 10, 2018
Jan. 09, 2018
Jan. 05, 2018
Jan. 04, 2018
Public Utilities, General Disclosures [Line Items]            
Maximum required nuclear liability insurance available $ 450.0       $ 100.0 $ 450.0
Maximum secondary financial protection available 110.0          
Maximum nuclear liability loss coverage per incident 560.0          
Federal nuclear property damage insurance, minimum required 1,060.0   $ 50.0 $ 1,060.0    
Maximum premium assessment under nuclear property damage insurance 10.4          
Federal Nuclear Property Damage Insurance 1,500.0          
Spent Nuclear Fuel Storage Insurance   $ 500.0        
Maximum nuclear property insurance terrorism coverage $ 3,240.0