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Inventories
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consisted of the following (in millions):
 
March 31,
2020
 
December 31,
2019
Raw materials
$
446

 
$
358

Work in process
2,192

 
2,227

Finished goods
1,044

 
999

Total inventories
$
3,682

 
$
3,584