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Retirement Plans (Tables)
9 Months Ended
Sep. 30, 2022
Retirement Benefits, Description [Abstract]  
Schedule of Components of Net Periodic Benefit Cost The components of net periodic benefit cost for the three and nine months ended September 30 were as follows:
COMPONENTS OF NET PERIODIC BENEFIT COST
Three months ended September 30,Nine months ended September 30,
(Dollars in millions)2022202120222021
Components of net periodic benefit cost
Interest cost$5 $$15 $12 
Expected return on plan assets(6)(7)(18)(15)
Amortization of unrecognized:
Actuarial (gain) loss4 8 
Other —  
Net periodic benefit cost$3 $(1)$5 $