Inventories (Tables)

12 Months Ended

Dec. 31, 2019

Inventory Disclosure [Abstract]

Components of Inventories

	As of December 31
(Dollars in millions)	2019		2018
Raw material	$	99	$	108
Work in progress	8		15
Finished products	62		71
Inventories	$	169	$	194
Inventory reserve at beginning of year	$	(23)	$	(27)
Reversal of reserve	1		1
Addition to reserve	(4)		(3)
Write-off against reserve	1		5
Translation difference	—		1
Inventory reserve at end of year	$	(25)	$	(23)
Total inventories, net of reserve	$	144	$	172