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Compensation and Benefit Plans (Performance Share Activity) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Performance Shares Classified As Equity Awards
 
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) 287,693 [1]
Granted (number of shares) 95,862
Forfeited (number of shares) (6,010)
Vested (number of shares) (135,124) [2]
Ending balance (number of shares) 242,421
Weighted Average Grant Date Fair Value [Abstract]  
Beginning balance, weighted average grant date fair value (dollars per share) $ 31.60 [1]
Granted, weighted average grant date fair value (dollars per share) $ 51.43
Forfeited, weighted average grant date fair value (dollars per share) $ 40.85
Vested, weighted average grant date fair value (dollars per share) $ 32.23 [2]
Ending balance, weighted average grant date fair value (dollars per share) $ 38.86
Performance Shares Classified As Liability Awards
 
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) 287,471 [1]
Granted (number of shares) 95,619
Forfeited (number of shares) (5,942)
Vested (number of shares) (135,077) [2]
Ending balance (number of shares) 242,071
Weighted Average Grant Date Fair Value [Abstract]  
Beginning balance, weighted average grant date fair value (dollars per share) $ 34.26 [1]
Ending balance, weighted average grant date fair value (dollars per share) $ 46.23
Southern California Edison | Performance Shares Classified As Equity Awards
 
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) 160,225 [1]
Granted (number of shares) 52,684
Forfeited (number of shares) (4,296)
Vested (number of shares) (79,124) [2]
Affiliate transfers, net (number of shares) 2,451
Ending balance (number of shares) 131,940
Weighted Average Grant Date Fair Value [Abstract]  
Beginning balance, weighted average grant date fair value (dollars per share) $ 31.62 [1]
Granted, weighted average grant date fair value (dollars per share) $ 51.48
Forfeited, weighted average grant date fair value (dollars per share) $ 41.76
Vested, weighted average grant date fair value (dollars per share) $ 32.05 [2]
Affiliate transfers, net, weighted average grant date fair value (dollars per share) $ 32.16
Ending balance, weighted average grant date fair value (dollars per share) $ 38.87
Southern California Edison | Performance Shares Classified As Liability Awards
 
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) 160,225 [1]
Granted (number of shares) 52,512
Forfeited (number of shares) (4,363)
Vested (number of shares) (79,133) [2]
Affiliate transfers, net (number of shares) 2,450
Ending balance (number of shares) 131,691
Weighted Average Grant Date Fair Value [Abstract]  
Beginning balance, weighted average grant date fair value (dollars per share) $ 34.52 [1]
Ending balance, weighted average grant date fair value (dollars per share) $ 46.19
[1] Excludes performance shares that were paid in 2012 as performance targets were met at December 31, 2011.
[2] Relates to performance shares that expired with zero value as performance targets were not met at December 31, 2012.