Inventories (Tables)

9 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Components of Inventories

Inventories are stated at the lower of cost (“FIFO”) and net realizable value. The components of inventories were as follows (dollars in millions):

	As of
	September 30, 2021			December 31, 2020
Raw materials	$	428		$	379
Work in progress	$	340			292
Finished products	$	244			220
Inventories		1,011			891
Inventory valuation reserve	$	(89	)		(93	)
Total inventories, net of reserve	$	922		$	798