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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
8. Property, Plant and Equipment
 
The table below presents the components of property, plant and equipment.
December 31,
2017
2016
(in millions)
Land
$
34
 
$
53
 
Buildings and improvements
 
404
 
 
437
 
Machinery, equipment, furniture and fixtures
 
1,959
 
 
1,857
 
Leasehold improvements
 
376
 
 
337
 
Gross property, plant and equipment
 
2,773
 
 
2,684
 
Accumulated depreciation and amortization
 
(1,663
)
 
(1,577
)
Property, plant and equipment, net
$
1,110
 
$
1,107