Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2025

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
	Three Months Ended March 31,
(Dollars in millions)	2025		2024
Components of net periodic benefit cost
Interest cost	$	8	$	8
Expected return on plan assets	(8)		(8)
Amortization of unrecognized:
Actuarial (gain) loss	3		3
Net periodic benefit cost	$	3	$	3