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Derivative Instruments (Additional Disclosures) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Derivatives          
Realized losses $ (25,000,000) $ (39,000,000) $ (52,000,000) $ (75,000,000)  
Unrealized gains (losses) 72,000,000 $ (16,000,000) 8,000,000 $ (85,000,000)  
Southern California Edison | Electric Utility | Economic Hedges          
Derivatives          
Aggregate fair value of all derivative liabilities with credit-risk-related contingent features 24,000,000   24,000,000   $ 38,000,000
Posted collateral 12,000,000   12,000,000   $ 0
Southern California Edison | Electric Utility | Economic Hedges | Payables          
Derivatives          
Potential amount of collateral to be posted if contingencies triggered $ 5,000,000   $ 5,000,000