v3.26.1
Retirement Plans (Tables)
6 Months Ended
Jun. 30, 2026
Retirement Benefits, Description [Abstract]  
Schedule of Components of Net Periodic Benefit Cost
The components of net periodic benefit cost for the three and six months ended June 30, 2026 and 2025 were as follows.
COMPONENTS OF NET PERIODIC BENEFIT COST
Three Months Ended June 30,Six Months Ended June 30,
(Dollars in millions)2026202520262025
Components of net periodic benefit cost
Interest cost$7 $$15 $16 
Expected return on plan assets(8)(8)(16)(16)
Amortization of unrecognized:
Actuarial (gain) loss3 6 
Net periodic benefit cost$2 $$5 $