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Compensation and Benefit Plans (Nonvested Performance Share Activity) (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Equity Awards    
Shares    
Beginning balance (in shares) 119,843  
Granted (in shares) 120,938  
Forfeited (in shares) (7,157)  
Vested (in shares) 0  
Ending balance (in shares) 233,624 119,843
Weighted Average Grant Date Fair Value    
Beginning balance, weighted average grant date fair value (in dollars per share) $ 66.03  
Granted, weighted average grant date fair value (in dollars per share) 67.55  
Forfeited, weighted average grant date fair value (in dollars per share) 66.76  
Vested, weighted average grant date fair value (in dollars per share) 0  
Ending balance, weighted average grant date fair value (in dollars per share) $ 66.80 $ 66.03
Liability Awards    
Shares    
Beginning balance (in shares) 113,186  
Granted (in shares) 0  
Forfeited (in shares) (3,825)  
Vested (in shares) (109,361)  
Ending balance (in shares) 0 113,186
Weighted Average Grant Date Fair Value    
Beginning balance, weighted average grant date fair value (in dollars per share) $ 67.30  
Ending balance, weighted average grant date fair value (in dollars per share) $ 0 $ 67.30
SCE | Equity Awards    
Shares    
Beginning balance (in shares) 63,172  
Granted (in shares) 64,133  
Forfeited (in shares) (6,408)  
Vested (in shares) 0  
Affiliate transfers, net (in shares) (253)  
Ending balance (in shares) 120,644 63,172
Weighted Average Grant Date Fair Value    
Beginning balance, weighted average grant date fair value (in dollars per share) $ 66.27  
Granted, weighted average grant date fair value (in dollars per share)   $ 67.15
Forfeited, weighted average grant date fair value (in dollars per share)   66.78
Vested, weighted average grant date fair value (in dollars per share)   0
Ending balance, weighted average grant date fair value (in dollars per share) $ 66.70 66.27
Affiliate transfers, net, weighted average grant date fair value (in dollars per share)   $ 71.27
SCE | Liability Awards    
Shares    
Beginning balance (in shares) 58,399  
Granted (in shares) 0  
Forfeited (in shares) (3,409)  
Vested (in shares) (54,578)  
Affiliate transfers, net (in shares) (412)  
Ending balance (in shares) 0 58,399
Weighted Average Grant Date Fair Value    
Beginning balance, weighted average grant date fair value (in dollars per share) $ 67.34  
Ending balance, weighted average grant date fair value (in dollars per share) $ 0 $ 67.34