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Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following (in millions):
 
June 30,
2018
 
December 31,
2017
Raw materials
$
303

 
$
232

Work in process
1,702

 
1,668

Finished goods
1,058

 
934

Total inventories
$
3,063

 
$
2,834