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Inventories (Tables)
6 Months Ended
Jun. 30, 2021
Inventory Disclosure [Abstract]  
Inventories
Inventories consisted of the following (in millions):
June 30, 2021December 31, 2020
Raw materials$641 $486 
Work in process2,443 2,437 
Finished goods1,031 970 
Total inventories$4,115 $3,893