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Inventories (Tables)
12 Months Ended
Dec. 31, 2016
Inventory Disclosure [Abstract]  
Inventories The components of total inventories are summarized as follows: 
 
December 31,
(in millions)
2016
 
2015
Finished goods
$
220

 
$
188

Work in process
42

 
32

Raw materials
260

 
213

Total inventories
$
522

 
$
433