Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2020

Retirement Benefits [Abstract]

Schedule of components of net periodic benefit cost

The Company’s net periodic benefit costs for plans for the three and six months ended June 30, 2020 and 2019 were as follows:

	Three Months Ended June 30				Six Months Ended June 30
(Dollars in millions)	2020		2019		2020		2019
Service cost	$	1	$	1	$	2	$	3
Interest cost	1		—		1		1
Expected return on plan assets	(1)		(1)		(1)		(1)
Net periodic benefit cost	$	1	$	—	$	2	$	3