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Fair Value Measurements (Details 6) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Carrying Value
   
Fair value and related carrying amounts of long-term debt and other long-term obligations    
Long-term debt and other long-term obligations $ 18,034 $ 17,049
Fair Value
   
Fair value and related carrying amounts of long-term debt and other long-term obligations    
Long-term debt and other long-term obligations 19,321 17,957
FES | Carrying Value
   
Fair value and related carrying amounts of long-term debt and other long-term obligations    
Long-term debt and other long-term obligations 2,996 3,001
FES | Fair Value
   
Fair value and related carrying amounts of long-term debt and other long-term obligations    
Long-term debt and other long-term obligations $ 3,098 $ 3,073