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Derivative Instruments (Textual) (Details) - SCE - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2014
Derivatives      
Potential amount of collateral to be posted if contingencies triggered $ 24,000,000    
Electric Utility | Economic hedges      
Derivatives      
Aggregate fair value of all derivative liabilities with credit-risk-related contingent features 1,000,000 $ 4,000,000  
Posted collateral 0 $ 17,000,000  
Potential amount of collateral to be posted if contingencies triggered     $ 1,000,000
Trigger | Electric Utility | Economic hedges      
Derivatives      
Potential amount of collateral to be posted if contingencies triggered $ 2,000,000