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Inventory, Net (Tables)
9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
(dollars in millions)September 30, 2021December 31, 2020
Raw materials$2,989 $3,015 
Work-in-process3,295 2,924 
Finished goods3,142 3,472 
Total inventory, net$9,426 $9,411