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Reinsurance (Tables)
 12 Months Ended
Dec. 31, 2011
Reinsurance  
Effect of reinsurance on premiums

 

 

 
   Years Ended December 31,  
 
   2011
   2010
   2009
  
   
 
   (in millions)
  

Direct premiums

   $ 1,421   $ 1,382   $ 1,317  

Reinsurance ceded

     (201 )   (203 )   (219 )
   

Net premiums

   $ 1,220   $ 1,179   $ 1,098