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Inventories
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Inventories Inventories
The components of total inventories are summarized as follows: 
(in millions)
March 31,
2018
 
December 31,
2017
Finished goods
$
246

 
$
223

Work in process
53

 
42

Raw materials
279

 
259

Total inventories
$
578

 
$
524