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Inventories
 9 Months Ended
Sep. 30, 2020
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)September 30, 2020December 31, 2019
Raw materials$93 $99 
Work in progress11 8 
Finished products48 62 
Inventories152 169 
Inventory valuation reserve(28)(25)
Total inventories, net of reserve$124 $144