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Inventory, Net (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Inventory Table [Table Text Block]
(dollars in millions)20192018
Raw materials$2,984 $2,624 
Work-in-process2,586 2,538 
Finished goods3,477 2,919 
$9,047 $8,081