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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2014
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment

5. Property, Plant and Equipment

Property, plant and equipment consist of (in millions):

 

     Estimated
Useful Lives
     December 31,  
        2014      2013  

Information technology assets

     2-7 Years       $ 49       $ 27   

Operating equipment

     3-15 Years         51         57   

Buildings and land (indefinite life)

     5-35 Years         73         60   

Construction in progress

        2         19   
     

 

 

    

 

 

 

Total property, plant and equipment

  175      163   

Less: accumulated depreciation

  (51   (61
     

 

 

    

 

 

 

Property, plant and equipment, net

$ 124    $ 102   
     

 

 

    

 

 

 

Depreciation expense was $16 million, $11 million and $8 million for the years ended December 31, 2014, 2013 and 2012, respectively.