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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2012
Schedule of Property and Equipment

Property and equipment included in other assets were as follows:

 

     December 31  
     2012        2011  
     (in millions)  

Cost

    $ 517         $ 589   

Accumulated depreciation

      248           306   
  

 

 

       

 

 

  
   $ 269         $ 283