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Inventories
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories consisted of the following (in millions):
 
March 31,
2018
 
December 31,
2017
Raw materials
$
275

 
$
232

Work in process
1,627

 
1,668

Finished goods
1,050

 
934

Total inventories
$
2,952

 
$
2,834