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Employee Retirement Benefits (Tables)
 9 Months Ended
Sep. 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 September 30,Nine months ended September 30,
2025202420252024
Service cost$2 $1 $4 $4 
Non-service (benefit) costs:
Interest cost3 4 10 10 
Expected return on plan assets(6)(5)(17)(16)
Amortization of actuarial (gain) loss and prior service cost— — (2)1 
 Total non-service benefit (3)(1)(9)(5)
Net periodic benefit$(1)$— $(5)$(1)