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Inventory (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
(dollars in millions)March 31, 2020December 31, 2019
Raw materials$3,576  $3,357  
Work-in-process2,850  2,726  
Finished goods5,080  4,867  
$11,506  $10,950