v3.25.2
Employee Retirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2025
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The following summarizes the components of net periodic benefit for our qualified and supplemental pension plans:
(Dollars in millions)Three months ended June 30,Six months ended June 30,
2025202420252024
Service cost$1 $2 $2 $3 
Non-service (benefit) costs:
Interest cost3 3 7 6 
Expected return on plan assets(5)(6)(11)(11)
Amortization of actuarial (gain) loss and prior service cost(1)1 (2)1 
 Total non-service benefit (3)(2)(6)(4)
Net periodic benefit$(2)$— $(4)$(1)