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Compensation and Benefit Plans (Restricted Stock Unit Activity) (Details) (Restricted Stock Units (RSUs), USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Beginning balance (number of shares) 737,635    
Granted (number of shares) 227,902    
Forfeited (number of shares) (12,139)    
Vested (number of shares) (273,930)    
Affiliate transfers, net (number of shares) 0    
Ending balance (number of shares) 679,468 737,635  
Weighted Average Grant Date Fair Value [Abstract]      
Beginning balance, weighted average grant date fair value (dollars per share) $ 32.20    
Granted, weighted average grant date fair value (dollars per share) $ 43.17 $ 38.01 $ 32.12
Forfeited, weighted average grant date fair value (dollars per share) $ 39.94    
Vested, weighted average grant date fair value (dollars per share) $ 26.37    
Affiliate transfers, net, weighted average grant date fair value (dollars per share) $ 0.00    
Ending balance, weighted average grant date fair value (dollars per share) $ 38.09 $ 32.20  
Southern California Edison
     
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Beginning balance (number of shares) 411,566    
Granted (number of shares) 125,217    
Forfeited (number of shares) (9,071)    
Vested (number of shares) (166,352)    
Affiliate transfers, net (number of shares) (7,193)    
Ending balance (number of shares) 368,553 411,566  
Weighted Average Grant Date Fair Value [Abstract]      
Beginning balance, weighted average grant date fair value (dollars per share) $ 32.14    
Granted, weighted average grant date fair value (dollars per share) $ 43.20 $ 38.07 $ 33.38
Forfeited, weighted average grant date fair value (dollars per share) $ 40.23    
Vested, weighted average grant date fair value (dollars per share) $ 26.85    
Affiliate transfers, net, weighted average grant date fair value (dollars per share) $ 31.43    
Ending balance, weighted average grant date fair value (dollars per share) $ 38.07 $ 32.14