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Derivative Instruments (Additional Disclosures) (Details) (Southern California Edison, USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Electric Utility | Economic hedges
         
Derivatives          
Realized gains (losses) $ (7) $ (67) $ (23) $ (122)  
Unrealized gains (losses) (64) 423 (118) 62  
Aggregate fair value of all derivative liabilities with credit-risk-related contingent features 59   59   6
Collateral already posted 0   0   0
Additional collateral, aggregate fair value 6   6    
Other current assets | Power Purchase Agreement
         
Derivatives          
Collateral already posted $ 8   $ 8