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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value of Financial Instruments 
Schedule of carrying amounts and fair values of financial instruments

At September 30, 2011
  Carrying
Amount

  Fair
Value

 
   
 
    
(In millions)
 

Investments and other assets—Constellation Energy

  $ 233.5   $ 233.8  

Fixed-rate long-term debt:

             
 

Constellation Energy (including BGE)

    3,843.0     4,301.2  
 

BGE

    2,113.9     2,365.3  

Variable-rate long-term debt:

             
 

Constellation Energy (including BGE)

    907.3     907.3