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Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 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 September 30:
Defined Benefit Pension PlansPostretirement Benefit PlanSupplemental Retirement Plans
(Dollars in millions)Three Months Ended September 30, 2022Three Months Ended September 30, 2021Three Months Ended September 30, 2022Three Months Ended September 30, 2021Three Months Ended September 30, 2022Three Months Ended September 30, 2021
Service cost$— $— $— $— $— $— 
Interest cost1 1 — — — — 
Less Expected return on plan assets(1)(2)— — — — 
Amortization of net actuarial loss (gain)— — — — — — 
Amortization of prior service cost— — — — — — 
Settlement expense (income)— — — — — — 
Net periodic benefit cost$— $(1)$— $— $— $— 
The following table summarizes the components of net periodic benefit cost for the Company's pension, postretirement and supplemental retirement plans for the nine months ended September 30,:
Defined Benefit Pension PlansPostretirement Benefit PlanSupplemental Retirement Plans
(Dollars in millions)Nine Months Ended September 30, 2022Nine Months Ended September 30, 2021Nine Months Ended September 30, 2022Nine Months Ended September 30, 2021Nine Months Ended September 30, 2022Nine Months Ended September 30, 2021
Service cost$— $— $— $— $— $— 
Interest cost$4 $4 — — 1 — 
Less Expected return on plan assets$(5)$(6)— — — — 
Amortization of net actuarial loss (gain)$1 $1 — (1)— — 
Amortization of prior service cost$— $— — — — — 
Settlement expense (income)$1 $— — — — — 
Net periodic benefit cost$1 $(1)$— $(1)$1 $—