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Inventories
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consisted of the following (in millions):
 
December 31,
 
2019
 
2018
Raw materials
$
358

 
$
257

Work in process
2,227

 
1,660

Finished goods
999

 
1,023

Total inventories
$
3,584

 
$
2,940