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Debt and Credit Agreements (Long-term debt maturities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Long-term Debt, Fiscal Year Maturity  
Long-term debt maturities - 2013 $ 0
Long-term debt maturities - 2014 1,200
Long-term debt maturities - 2015 300
Long-term debt maturities - 2016 400
Long-term debt maturities - 2017 400
Southern California Edison
 
Long-term Debt, Fiscal Year Maturity  
Long-term debt maturities - 2013 0
Long-term debt maturities - 2014 1,200
Long-term debt maturities - 2015 300
Long-term debt maturities - 2016 400
Long-term debt maturities - 2017 $ 0