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Commitments and Contingencies (Spent Nuclear Fuel) (Details) - USD ($)
$ in Millions
1 Months Ended
Apr. 30, 2016
Jun. 30, 2010
Feb. 28, 2017
Sep. 30, 2016
SCE and other owners of San Onofre and Palo Verde        
Loss Contingencies [Line Items]        
Damages sought   $ 142    
Damage award $ 162      
SCE        
Loss Contingencies [Line Items]        
Damages sought   $ 112    
Damage award $ 124      
Claim to recover damages incurred       $ 56
SCE | Subsequent event        
Loss Contingencies [Line Items]        
Claim to recover damages incurred     $ 43