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Preferred and Preference Stock of Utility (Schedule of Preferred and Preference Stock) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Preferred and Preference Stock of Utility    
Edison International's preferred and preference stock of utility $ 2,191 $ 2,020
SCE    
Preferred and Preference Stock of Utility    
Edison International's preferred and preference stock of utility $ 2,245 2,070
SCE | 4.08% Series    
Preferred and Preference Stock of Utility    
Preferred Stock, dividend rate, (as a percent) 4.08%  
Shares Outstanding 650,000  
Redemption Price (in dollars per share) $ 25.5  
Preferred stock before issuance costs $ 16 16
SCE | 4.24% Series    
Preferred and Preference Stock of Utility    
Preferred Stock, dividend rate, (as a percent) 4.24%  
Shares Outstanding 1,200,000  
Redemption Price (in dollars per share) $ 25.8  
Preferred stock before issuance costs $ 30 30
SCE | 4.32% Series    
Preferred and Preference Stock of Utility    
Preferred Stock, dividend rate, (as a percent) 4.32%  
Shares Outstanding 1,653,429  
Redemption Price (in dollars per share) $ 28.75  
Preferred stock before issuance costs $ 41 41
SCE | 4.78% Series    
Preferred and Preference Stock of Utility    
Preferred Stock, dividend rate, (as a percent) 4.78%  
Shares Outstanding 1,296,769  
Redemption Price (in dollars per share) $ 25.8  
Preferred stock before issuance costs $ 33 33
SCE | Preference stock    
Preferred and Preference Stock of Utility    
Preferred stock before issuance costs 2,245 2,070
Less issuance costs (54) (50)
Edison International's preferred and preference stock of utility $ 2,191 2,020
SCE | 6.50% Series D (cumulative)    
Preferred and Preference Stock of Utility    
Preferred Stock, dividend rate, (as a percent) 6.50%  
Shares Outstanding 1,250,000  
Redemption Price (in dollars per share) $ 100  
Preferred stock before issuance costs $ 0 125
SCE | 6.25% Series E (cumulative)    
Preferred and Preference Stock of Utility    
Preferred Stock, dividend rate, (as a percent) 6.25%  
Shares Outstanding 350,000  
Redemption Price (in dollars per share) $ 1,000  
Preferred stock before issuance costs $ 350 350
SCE | 5.625% Series F (cumulative)    
Preferred and Preference Stock of Utility    
Preferred Stock, dividend rate, (as a percent) 5.625%  
Shares Outstanding 190,004  
Redemption Price (in dollars per share) $ 2,500  
Preferred stock before issuance costs $ 475 475
SCE | 5.10% Series G (cumulative)    
Preferred and Preference Stock of Utility    
Preferred Stock, dividend rate, (as a percent) 5.10%  
Shares Outstanding 160,004  
Redemption Price (in dollars per share) $ 2,500.00  
Preferred stock before issuance costs $ 400 400
SCE | 5.75% Series H (cumulative)    
Preferred and Preference Stock of Utility    
Preferred Stock, dividend rate, (as a percent) 5.75%  
Shares Outstanding 110,004  
Redemption Price (in dollars per share) $ 2,500.00  
Preferred stock before issuance costs $ 275 275
SCE | 5.375% Series J (cumulative)    
Preferred and Preference Stock of Utility    
Preferred Stock, dividend rate, (as a percent) 5.375%  
Shares Outstanding 130,004  
Redemption Price (in dollars per share) $ 2,500.00  
Preferred stock before issuance costs $ 325 325
SCE | 5.45% Series K (cumulative)    
Preferred and Preference Stock of Utility    
Preferred Stock, dividend rate, (as a percent) 5.45%  
Shares Outstanding 120,004  
Redemption Price (in dollars per share) $ 2,500  
Preferred stock before issuance costs $ 300 $ 0