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Property, Plant and Equipment, net
12 Months Ended
Dec. 31, 2015
Property Plant And Equipment [Abstract]  
Property, Plant and Equipment, net

5. Property, Plant and Equipment, net

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

 

  

 

Estimated

 

December 31,

 

 

 

Useful Lives

 

2015

 

 

2014

 

Information technology assets

 

1-7 Years

 

$

48

 

 

$

49

 

Operating equipment

 

2-15 Years

 

 

84

 

 

 

51

 

Buildings and land (1)

 

5-35 Years

 

 

98

 

 

 

73

 

Construction in progress

 

 

 

 

 

 

 

2

 

Total property, plant and equipment

 

 

 

 

230

 

 

 

175

 

Less: accumulated depreciation

 

 

 

 

(65

)

 

 

(51

)

Property, plant and equipment, net

 

 

 

$

165

 

 

$

124

 

 

 

(1)

Land has an indefinite life.

Depreciation expense was $25 million, $16 million and $11 million for the years ended December 31, 2015, 2014 and 2013, respectively.