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Preferred and Preference Stock of SCE (Details) - USD ($)
3 Months Ended 9 Months Ended
Jul. 27, 2017
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Class of Stock [Line Items]        
Redemption of trust securities     $ 475,000,000 $ 125,000,000
Southern California Edison        
Class of Stock [Line Items]        
Redemption of trust securities     475,000,000 $ 125,000,000
Southern California Edison | Series F Preferred Stock        
Class of Stock [Line Items]        
Redemption of trust securities $ 475,000,000      
Southern California Edison | Trust VI | Variable Interest Entity, Not Primary Beneficiary | Series L Preferred Stock        
Class of Stock [Line Items]        
Liquidation preference   $ 475,000,000 $ 475,000,000  
Security dividend rate   5.00% 5.00%  
Preferred shares issued   190,004    
Liquidation value (in dollars per share)   $ 2,500 $ 2,500