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Commitments and Contingencies (Permanent Retirement of San Onofre) (Details) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 20, 2017
Dec. 19, 2017
Dec. 31, 2017
Dec. 31, 2018
Loss Contingencies [Line Items]        
Regulatory assets     $ 4,914 $ 5,380
SCE        
Loss Contingencies [Line Items]        
Regulatory assets     4,914 5,380
San Onofre | SCE        
Loss Contingencies [Line Items]        
Regulatory assets   $ 775 72 $ 0
San Onofre | SCE        
Loss Contingencies [Line Items]        
Proceeds received   $ 72    
Refund $ 155      
San Onofre | SCE | Arbitration with Mitsubishi Heavy Industries        
Loss Contingencies [Line Items]        
Proceeds received     $ 47