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Inventories (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following (in millions):
September 30, 2020December 31, 2019
Raw materials$496 $358 
Work in process2,551 2,227 
Finished goods895 999 
Total inventories$3,942 $3,584