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Preferred and Preference Stock of Utility (Details) (Southern California Edison, USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
6.25% Series E
Jun. 30, 2012
5.625% Series F
Jun. 30, 2012
Series A
Preferred and Preference Stock of Utility      
Shares issued (in shares) 350,000 190,004  
Preference stock (as a percent) 6.25% 5.625%  
Preference share, liquidation value (in dollars per share) $ 1,000 $ 2,500  
Stock redeemed and retired     $ 75