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Inventories
 3 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories are stated at the lower of cost (according to first-in-first-out basis, "FIFO") and net realizable value. The components of inventories were as follows:
As of
(Dollars in millions)March 31, 2021December 31, 2020
Raw materials$112 $105 
Work in progress15 14 
Finished products47 51 
Inventories174 170 
Inventory valuation reserve(36)(36)
Total inventories, net of reserve$138 $134