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Fair Value Measurements (Fair Value of Long-Term Debt Recorded at Carrying Value) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value of Long-Term Debt Recorded at Carrying Value    
Carrying Value $ 10,426 $ 10,426
Fair Value 11,442 11,084
Southern California Edison
   
Fair Value of Long-Term Debt Recorded at Carrying Value    
Carrying Value 10,023 10,022
Fair Value $ 11,012 $ 10,656