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Preferred and Preference Stock of Utility (Schedule of Preferred and Preference Stock) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Preferred and Preference Stock of Utility    
Edison International's preferred and preference stock of utility $ 1,759 $ 1,029
Southern California Edison
   
Preferred and Preference Stock of Utility    
Edison International's preferred and preference stock of utility 1,795 1,045
Southern California Edison | 4.08% Series
   
Preferred and Preference Stock of Utility    
Shares Outstanding (shares) 650,000  
Redemption Price (in dollars per share) $ 25.5  
Preferred stock before issuance costs 16 16
Preference stock (as a percent) 4.08%  
Southern California Edison | 4.24% Series
   
Preferred and Preference Stock of Utility    
Shares Outstanding (shares) 1,200,000  
Redemption Price (in dollars per share) $ 25.8  
Preferred stock before issuance costs 30 30
Preference stock (as a percent) 4.24%  
Southern California Edison | 4.32% Series
   
Preferred and Preference Stock of Utility    
Shares Outstanding (shares) 1,653,429  
Redemption Price (in dollars per share) $ 28.75  
Preferred stock before issuance costs 41 41
Preference stock (as a percent) 4.32%  
Southern California Edison | 4.78% Series
   
Preferred and Preference Stock of Utility    
Shares Outstanding (shares) 1,296,769  
Redemption Price (in dollars per share) $ 25.8  
Preferred stock before issuance costs 33 33
Preference stock (as a percent) 4.78%  
Southern California Edison | Preferred and Preference Stock
   
Preferred and Preference Stock of Utility    
Preferred stock before issuance costs 1,795 1,045
Less issuance costs (36) (16)
Edison International's preferred and preference stock of utility 1,759 1,029
Southern California Edison | 4.32% Series A (variable and noncumulative)
   
Preferred and Preference Stock of Utility    
Shares Outstanding (shares) 3,250,000  
Redemption Price (in dollars per share) $ 100  
Preferred stock before issuance costs 325 400
Preference stock (as a percent) 4.32%  
Southern California Edison | 6.125% Series B (noncumulative)
   
Preferred and Preference Stock of Utility    
Shares Outstanding (shares) 2,000,000  
Redemption Price (in dollars per share) $ 100  
Preferred stock before issuance costs 200 200
Preference stock (as a percent) 6.125%  
Southern California Edison | 6.00% Series C (noncumulative)
   
Preferred and Preference Stock of Utility    
Shares Outstanding (shares) 2,000,000  
Redemption Price (in dollars per share) $ 100  
Preferred stock before issuance costs 200 200
Preference stock (as a percent) 6.00%  
Southern California Edison | 6.50% Series D (cumulative)
   
Preferred and Preference Stock of Utility    
Shares Outstanding (shares) 1,250,000  
Redemption Price (in dollars per share) $ 100  
Preferred stock before issuance costs 125 125
Preference stock (as a percent) 6.50%  
Southern California Edison | 6.25% Series E (cumulative)
   
Preferred and Preference Stock of Utility    
Shares Outstanding (shares) 350,000  
Redemption Price (in dollars per share) $ 1,000  
Preferred stock before issuance costs 350 0
Preference stock (as a percent) 6.25%  
Southern California Edison | 5.625% Series F (cumulative)
   
Preferred and Preference Stock of Utility    
Shares Outstanding (shares) 190,004  
Redemption Price (in dollars per share) $ 2,500  
Preferred stock before issuance costs $ 475 $ 0
Preference stock (as a percent) 5.625%