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Inventory (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
(dollars in millions)June 30, 2020December 31, 2019
Raw materials$3,375  $2,984  
Work-in-process3,031  2,586  
Finished goods3,850  3,477  
$10,256  $9,047