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Inventory (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
(dollars in millions)
March 31, 2019
 
December 31, 2018
Raw materials
$
2,944

 
$
3,052

Work-in-process
2,819

 
2,673

Finished goods
4,711

 
4,358

 
$
10,474

 
$
10,083