Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2020

Retirement Benefits [Abstract]

Schedule of components of net periodic benefit cost

The Company’s net periodic benefit costs for plans for the three months ended March 31, 2020 and 2019 were as follows:

	Three Months Ended March 31
(Dollars in millions)	2020		2019
Service cost	$	1	$	1
Interest cost	1		—
Expected return on plan assets	(1)		(1)
Net periodic benefit cost	$	1	$	—