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INVENTORIES (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Inventories by Major Category
 
December 31,
(Dollars in millions)
2018
 
2019
Raw materials
$
88

 
$
80

Work-in-process
56

 
51

Finished goods
225

 
233

Replacement parts and other supplies
29

 
31

Inventories
$
398

 
$
395