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Derivative Instruments and Hedging Activities (Additional Disclosures) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Collateral provided to counterparties:      
Reflected in margin and collateral deposits $ 19 $ 8  
Southern California Edison | Economic hedges
     
Derivatives      
Realized losses (56) (227) (165)
Unrealized gains (losses) 93 125 (768)
Southern California Edison | Electric Utility | Economic hedges
     
Derivatives      
Aggregate fair value of all derivative liabilities with credit-risk-related contingent features 49 6  
Collateral already posted, fair value 0 0  
Potential additional collateral $ 5