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Retirement Plans (Tables)
3 Months Ended
Mar. 31, 2023
Retirement Benefits, Description [Abstract]  
Schedule of Components of Net Periodic Benefit Cost The components of net periodic benefit cost for the three months ended March 31 were as follows:
COMPONENTS OF NET PERIODIC BENEFIT COST
(Dollars in millions)20232022
Components of net periodic benefit cost
Interest cost$8 $
Expected return on plan assets(8)(6)
Amortization of unrecognized:
Actuarial (gain) loss3 
Net periodic benefit cost$3 $