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Inventory, Net (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Inventory Table [Table Text Block]
(dollars in millions)20202019
Raw materials$3,015 $2,984 
Work-in-process2,924 2,586 
Finished goods3,472 3,477 
$9,411 $9,047