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Derivative Instruments (Additional Disclosures) (Details) (Southern California Edison, USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Electric Utility | Economic hedges
         
Derivatives          
Realized losses $ (15) $ (77) $ (38) $ (199)  
Unrealized losses (41) (91) (159) (29)  
Aggregate fair value of all derivative liabilities with credit-risk-related contingent features 53   53   6
Additional collateral, aggregate fair value 14   14    
Collateral already posted 0   0   0
Other current assets | Commodity Contracts
         
Derivatives          
Collateral already posted $ 14   $ 14   $ 8