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Derivative Instruments (Additional Disclosures) (Details) - Southern California Edison - Electric Utility - Economic hedges - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Derivatives      
Aggregate fair value of all derivative liabilities with credit-risk-related contingent features $ 50,000,000   $ 38,000,000
Collateral already posted 12,000,000   $ 0
Potential amount of collateral to be posted if contingencies triggered 31,000,000    
Realized losses (27,000,000) $ (36,000,000)  
Unrealized losses (64,000,000) $ (69,000,000)  
Payables      
Derivatives      
Potential amount of collateral to be posted if contingencies triggered $ 3,000,000