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Derivative Instruments (Additional Disclosures) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Collateral provided to counterparties:      
Reflected in margin and collateral deposits $ 31 $ 36  
Gross amounts recognized | Southern California Edison      
Collateral provided to counterparties:      
Realized losses (148) (57) $ (56)
Unrealized (losses) gains (182) (147) $ 93
Gross amounts recognized | Southern California Edison | Electric Utility      
Derivatives      
Aggregate fair value of all derivative liabilities with credit-risk-related contingent features 38 53  
Collateral already posted, fair value 0 $ 13  
Potential additional collateral 22    
Gross amounts recognized | Payables | Southern California Edison | Electric Utility      
Derivatives      
Potential additional collateral $ 8