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Preferred and Preference Stock of SCE (Details) - USD ($)
6 Months Ended
Jul. 27, 2017
Jun. 30, 2017
Jun. 30, 2016
Class of Stock [Line Items]      
Redemption of trust securities     $ 125,000,000
Southern California Edison      
Class of Stock [Line Items]      
Redemption of trust securities     $ 125,000,000
Southern California Edison | Series F Preferred Stock | Forecast      
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  
Security dividend rate   5.00%  
Preferred shares issued   190,004  
Liquidation value (in dollars per share)   $ 2,500