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Inventories
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories consisted of the following (in millions):
 
December 31,
 
2017
 
2016
Raw materials
$
232

 
$
225

Work in process
1,668

 
1,608

Finished goods
934

 
912

Total inventories
$
2,834

 
$
2,745