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Employee Benefit Plans (Tables) | 12 Months Ended
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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) |  | 2024 |  | 2023 |  | 2024 |  | 2023
Change in benefit obligation: |  |  |  |  |  |  |  |
Accumulated benefit obligation as of January 1, |  | $ | 127 |  |  | $ | 128 |  |  | $ | 10 |  |  | $ | 12 |
Service cost |  | 1 |  |  | 1 |  |  | 0 |  |  | 0 |
Interest cost |  | 6 |  |  | 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 assets |  | 15 |  |  | 23 |  |  | 1 |  |  | 1 |
Employer contributions |  | 1 |  |  | 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) |  | 2024 |  | 2023 |  | 2024 |  | 2023
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) |

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- Definition Tabular disclosure of the change in the benefit obligation, fair value of plan assets, and funded status of pension plans or other employee benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Subparagraph (a)(b)(c) -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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