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Business Segments (Tables)
3 Months Ended
Mar. 31, 2012
Business Segments [Abstract]  
Summary Of Company's Segment Results
Summary Of Premiums Earned On Financial Guarantees And Insured Derivatives By Geographic Location Of Risk
     Three Months Ended March 31,  

In millions

   2012      2011  
Total premiums earned:      

United States

     $ 119         $ 122   

United Kingdom

     8         7   

Europe (excluding United Kingdom)

     5         12   

Internationally diversified

     5         9   

Central and South America

     11         9   

Asia

     1         7   

Other

     3         3   
  

 

 

    

 

 

 
Total      $ 152         $ 169   
  

 

 

    

 

 

 
Summary Of Segments Within Wind-Down Operations