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PROPERTY AND EQUIPMENT, NET
 12 Months Ended
Dec. 31, 2013
PROPERTY AND EQUIPMENT, NET

7. PROPERTY AND EQUIPMENT, NET

Property and equipment was comprised of the following at December 31, 2013 and 2012:

 

     2013     2012  
     (in millions)  

Land

    $ 20      $ 20   

Buildings and leasehold improvements

      693        620   

Equipment

      639        728   

Computer software

      1,396        1,145   
  

 

 

    

 

 

  
     2,748        2,513   

Accumulated depreciation

      (1,530 )      (1,415 ) 
  

 

 

    

 

 

  

Property and equipment, net

    $ 1,218      $ 1,098   
  

 

 

    

 

 

  

Depreciation expense was $309 million in 2013, $263 million in 2012, and $249 million in 2011, including amortization expense for capitalized internally developed and purchased software of $172 million in 2013, $151 million in 2012, and $139 million in 2011.