Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2021

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, 2021 and 2020 were as follows:

	Three Months Ended March 31
(Dollars in millions)	2021		2020
Service cost	$	1	$	1
Interest cost	1		1
Expected return on plan assets	(1)		(1)
Net periodic benefit cost	$	1	$	1