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Inventory (Tables)
9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
(dollars in millions)September 30, 2020December 31, 2019
Raw materials$3,163 $2,984 
Work-in-process2,915 2,586 
Finished goods3,765 3,477 
$9,843 $9,047