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Inventory (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
(dollars in millions)
June 30, 2019
 
December 31, 2018
Raw materials
$
3,024

 
$
3,052

Work-in-process
2,863

 
2,673

Finished goods
5,047

 
4,358

 
$
10,934

 
$
10,083