Inventories (Tables)

9 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Components of 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, 2021		December 31, 2020
Raw materials	$	158	$	105
Work in progress	23		14
Finished products	52		51
Inventories	233		170
Inventory valuation reserve	(46)		(36)
Total inventories, net of reserve	$	187	$	134