Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Property, plant and equipment

	As of December 31
(Dollars in millions)	2020		2019		Estimated life (years)
Machinery and equipment	825		634		3-8
Buildings	134		103		20
Construction in progress	63		195		n/a
Property, plant and equipment	$	1,022	$	932
Less accumulated depreciation	(591)		(459)
Net of accumulated depreciation	$	431	$	473
	Year Ended December 31
DEPRECIATION INCLUDED IN (Dollars in millions)	2020		2019		2018
Cost of sales	$	54	$	59	$	62
Selling, general and administrative expenses	4		4		3
Research, development and engineering expenses, net	39		32		22
Total	$	97	$	95	$	88