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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following (in millions):
 
June 30,
2017
 
December 31,
2016
Raw materials
$
237

 
$
225

Work in process
1,618

 
1,608

Finished goods
1,106

 
912

Total inventories
$
2,961

 
$
2,745