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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Components of Property and Equipment
Property and equipment is comprised of the following (in millions):
 
December 31,
 
2015
 
2014
Buildings
$
50

 
$
49

Land
10

 
10

Machinery, equipment and tooling
210

 
178

Furniture and office equipment
20

 
14

Computers and software
180

 
147

Leasehold improvements
63

 
21

Projects in progress - other
21

 
29

 
554

 
448

Less accumulated depreciation and amortization
(256
)
 
(193
)
Net property and equipment
$
298

 
$
255
Other Items Related to Property and Equipment
Other items related to property and equipment are as follows (in millions):
 
December 31,
 
2015
 
2014
Unamortized computer software costs
$
40

 
$
41
Depreciation and Amortization Related to Property and Equipment
 
Year Ended December 31,
 
2015
 
2014
 
2013
Amortization of capitalized software
$
9

 
$
9

 
$
9

Total depreciation expense charged to operations
69

 
27

 
25