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Inventories
12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
As of December 31
(Dollars in millions)20212020
Raw material$165 $105 
Work in progress23 14 
Finished products53 51 
Inventories$241 $170 
Inventory reserve at beginning of year$(36)$(25)
Addition to reserve(16)(11)
Write-off against reserve— 
Translation difference(1)
Inventory reserve at end of year$(49)$(36)
Total inventories, net of reserve$192 $134