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Debt and Credit Agreements (Summary for Status of Credit Facilities) (Details) - Multi-year credit facilities - USD ($)
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]      
Amount available $ 1,500,000,000    
SCE      
Line of Credit Facility [Line Items]      
Commitment 3,000,000,000.0    
Outstanding borrowings (excluding discount) (550,000,000)    
Outstanding letters of credit (152,000,000)    
Amount available 2,298,000,000    
Edison International      
Line of Credit Facility [Line Items]      
Commitment   $ 1,500,000,000  
Outstanding borrowings (excluding discount) 0   $ 0
Outstanding letters of credit 0    
Amount available $ 1,500,000,000