Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2022

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

The following table summarizes the components of net periodic benefit cost for the Company's pension, postretirement and supplemental retirement plans for the three months ended March 31,:

	Defined Benefit Pension Plans				Postretirement Benefit Plan				Supplemental Retirement Plans
(Dollars in millions)	March 31, 2022		March 31, 2021		March 31, 2022		March 31, 2021		March 31, 2022		March 31, 2021
Service cost	$	—	$	—	$	—	$	—	$	—	$	—
Interest cost	$	2	$	1	$	—	$	—	$	—	$	—
Less Expected return on plan assets	$	(2)	$	(2)	$	—	$	—	$	—	$	—
Amortization of net actuarial loss (gain)	$	—	$	1	$	—	$	—	$	—	$	—
Amortization of prior service cost	$	—	$	—	$	—	$	—	$	—	$	—
Settlement expense (income)	$	1	$	—	$	—	$	—	$	—	$	—
Net periodic benefit cost	$	1	$	—	$	—	$	—	$	—	$	—