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Debt and Credit Agreements (Summary for Status of Credit Facilities) (Details) - Multi-year credit facilities - USD ($)
Dec. 31, 2018
May 31, 2018
Apr. 30, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]        
Commitment $ 1,500,000,000 $ 1,500,000,000 $ 1,250,000,000  
Outstanding borrowings (excluding discount) 0     $ (639,000,000)
Outstanding letters of credit 0      
Amount available 1,500,000,000      
SCE        
Line of Credit Facility [Line Items]        
Commitment 3,000,000,000 $ 3,000,000,000 $ 2,750,000,000  
Outstanding borrowings (excluding discount) (721,000,000)      
Outstanding letters of credit (190,000,000)      
Amount available $ 2,089,000,000