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Inventories
3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consisted of the following (in millions):
March 31, 2021December 31, 2020
Raw materials$605 $486 
Work in process2,463 2,437 
Finished goods949 970 
Total inventories$4,017 $3,893