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Benefit Plans (Tables)
6 Months Ended
Jun. 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 June 30,Six Months Ended June 30,
(Dollars in millions)Income Statement Location2026202520262025
Service cost
Personnel expense
$75 $69 $150 $137 
Interest costOther expense122 114 244 228 
Estimated return on plan assetsOther expense(267)(242)(534)(485)
Net periodic (benefit) cost$(70)$(59)$(140)$(120)