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Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Inventories
The components of total inventories are summarized as follows: 
(in millions)
September 30,
2019
 
December 31,
2018
Finished goods
$
231

 
$
248

Work in process
54

 
45

Raw materials
295

 
302

Total inventories
$
580

 
$
595