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Inventory (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
(dollars in millions)
September 30, 2019
 
December 31, 2018
Raw materials
$
3,149

 
$
3,052

Work-in-process
2,921

 
2,673

Finished goods
5,172

 
4,358

 
$
11,242

 
$
10,083