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Inventory, Net
 9 Months Ended
Sep. 30, 2021
Inventory Disclosure [Abstract]  
Inventory [Text Block] Inventory, net
(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 
Raw materials, work-in-process and finished goods are net of total valuation reserves of $1,943 million and $1,788 million as of September 30, 2021 and December 31, 2020, respectively.