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Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following (in millions):
September 30, 2021December 31, 2020
Raw materials$667 $486 
Work in process2,313 2,437 
Finished goods1,172 970 
Total inventories$4,152 $3,893