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Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Components of Inventories
As of December 31
(Dollars in millions)20202019
Raw material$105 $99 
Work in progress14 
Finished products51 62 
Inventories$170 $169 
Inventory reserve at beginning of year$(25)$(23)
Reversal of reserve— 
Addition to reserve(11)(4)
Write-off against reserve
Translation difference(1)— 
Inventory reserve at end of year$(36)$(25)
Total inventories, net of reserve$134 $144