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Employee Retirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2024
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,
2024202320242023
Service cost$1 $1 $4 $4 
Non-service (benefit) costs:
Interest cost4 3 10 9 
Expected return on plan assets(5)(5)(16)(15)
Amortization of actuarial loss (gain) and prior
  service cost 		— — 1 (2)
Other— — — (5)
 Total non-service benefit (1)(2)(5)(13)
Net periodic benefit$— $(1)$(1)$(9)