Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

Schedule of components of net periodic benefit cost

The Company’s net periodic benefit costs for plans for the three and nine months ended September 30, 2021 and 2020 were as follows:

	Three Months Ended September 30				Nine Months Ended September 30
(Dollars in millions)	2021		2020		2021		2020
Service cost	$	1	$	1	$	3	$	3
Interest cost	1		1		2		2
Expected return on plan assets	(1)		(1)		(2)		(2)
Net periodic benefit cost	$	1	$	1	$	3	$	3