Commitment and Contingencies (Tables)

12 Months Ended

Dec. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Schedule of Restructuring and Related Costs

See the table below for a breakout of restructuring costs incurred by segment and by nature of cost incurred:

	Year Ended December 31,
(Dollars in millions)	2021		2020		2019
AST
Severance	$	3	$	—	$	—
Facility abandonment	—		—		3
Inventory	—		—		—
Total AST	3		—		3
NC&C
Severance	2		6		1
Facility abandonment	—		—		—
Inventory	—		—		2
Total NC&C	2		6		3
IMS
Severance	—		—		2
Facility abandonment	—		6		6
Inventory	—		—		5
Total IMS	—		6		13
Corporate
Severance	—		—		—
Facility abandonment	—		—		1
Inventory	—		—		—
Total Corporate	—		—		1
Total	$	5	$	12	$	20

The following is a summary of changes in the restructuring provision balance during the years ended December 31, 2020 and 2021:

(Dollars in millions)
Balance at January 1, 2020	$	4
Additional provision	12
Reversal and utilization	(15)
Balance at December 31, 2020	1
Additional provision	5
Reversal and utilization	(2)
Balance at December 31, 2021	$	4

Schedule of Product Warranty Liability

The following is a summary of changes in the product warranty balances during the years ended December 31, 2020 and 2021:

(Dollars in millions)
Balance at January 1, 2020	$	13
Additional provision	16
Reversal and utilization	(12)
Balance at December 31, 2020	17
Additional provision	17
Reversal and utilization	(15)
Balance at December 31, 2021	$	19