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Inventories (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following (in millions):
 
September 30,
2019
 
December 31,
2018
Raw materials
$
324

 
$
257

Work in process
1,923

 
1,660

Finished goods
996

 
1,023

Total inventories
$
3,243

 
$
2,940