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Inventories
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories
(In millions)
2017
 
2016
Raw materials
$
466

 
$
436

Work in process
142

 
131

Finished goods
2,179

 
2,060

 
$
2,787

 
$
2,627