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Guarantees (Tables)
9 Months Ended
Sep. 30, 2011
Guarantees 
Schedule of maximum exposure by guarantor

At September 30, 2011
  Stated Limit
 
   
 
  (In billions)
 

Constellation Energy guarantees

  $ 9.1  

BGE guarantees

    0.3  
   

Total guarantees

  $ 9.4