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Employee Retirement Benefits (Tables) | 3 Months Ended
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Mar. 31, 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 March 31,
|  |  |  |  |  | 2025 |  | 2024
Service cost |  |  |  |  |  | $ | 1 |  |  | $ | 1 |
Non-service (benefit) costs: |  |  |  |  |  |  |  |
Interest cost |  |  |  |  |  | 4 |  |  | 3 |
Expected return on plan assets |  |  |  |  |  | (6) |  |  | (5) |
Amortization of actuarial gain and prior service cost |  |  |  |  |  | (1) |  |  | — |
Total non-service benefit |  |  |  |  |  | (3) |  |  | (2) |
Net periodic benefit |  |  |  |  |  | $ | (2) |  |  | $ | (1) |

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