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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2024
Retirement Benefits [Abstract]  
Schedule of Changes in Benefit Obligation and Plan Assets
The following table sets forth, on an aggregated basis, changes in the benefit obligation and plan assets, the funded status and how the funded status is recognized on our consolidated balance sheets.    
Table 15.1: Changes in Benefit Obligation and Plan Assets
Defined Pension 
Benefits		Other Postretirement
Benefits
(Dollars in millions)2024202320242023
Change in benefit obligation:
Accumulated benefit obligation as of January 1, $127 $128 $10 $12 
Service cost1 1 0 0 
Interest cost6 7 0 0 
Benefits paid(11)(10)(1)(2)
Actuarial loss (gain)(5)1 0 0 
Accumulated benefit obligation as of December 31,$118 $127 $9 $10 
Change in plan assets:
Fair value of plan assets as of January 1, $236 $222 $5 $5 
Actual return on plan assets15 23 1 1 
Employer contributions1 1 1 1 
Benefits paid(11)(10)(1)(2)
Fair value of plan assets as of December 31, $241 $236 $6 $5 
Over (under) funded status as of December 31, $123 $109 $(3)$(5)
Defined Pension 
Benefits		Other Postretirement
Benefits
(Dollars in millions)2024202320242023
Balance sheet presentation as of December 31,
Other assets$131 $117 $0 $0 
Other liabilities(8)(8)(3)(5)
Net amount recognized as of December 31, $123 $109 $(3)$(5)