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Property, Plant and Equipment (Tables)
6 Months Ended
Jun. 30, 2018
Property, Plant and Equipment [Abstract]  
Summary of property, plant and equipment
 
June 30, 2018
 
December 31, 2017
 
(in millions)
Land and improvements
$
44

 
$
48

Buildings
82

 
83

Machinery and equipment
3,750

 
3,734

Other
150

 
138

 
4,026

 
4,003

Less: Accumulated depreciation
1,532

 
1,431

Total property, plant and equipment, net
$
2,494

 
$
2,572