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Property And Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2011
Property And Equipment, Net [Abstract]  
Property And Equipment, Net
     2011     2010  
     (in millions)  

Land

   $ 18      $ 18   

Buildings and leasehold improvements

     523        476   

Equipment

     606        540   

Computer software

     935        1,025   
  

 

 

   

 

 

 
     2,082        2,059   

Accumulated depreciation

     (1,170     (1,244
  

 

 

   

 

 

 

Property and equipment, net

   $ 912      $ 815