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Fair Value Measurements (Fair Value of Long-Term Debt Recorded at Carrying Value) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair Value of Long-Term Debt Recorded at Carrying Value    
Carrying Value $ 9,232 $ 9,231
Fair Value 10,016 10,944
Southern California Edison
   
Fair Value of Long-Term Debt Recorded at Carrying Value    
Carrying Value 8,828 8,828
Fair Value $ 9,590 $ 10,505