v3.26.3
Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2026
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The components of net periodic (benefit) cost for defined benefit pension plans are summarized in the following table:

Three Months Ended September 30,Nine Months Ended September 30,
(Dollars in millions)Income Statement Location2026202520262025
Service cost
Personnel expense
$77 $67 $227 $204 
Interest costOther expense122 114 366 342 
Estimated return on plan assetsOther expense(267)(243)(801)(728)
Net periodic (benefit) cost$(68)$(62)$(208)$(182)