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Retirement Benefits | 3 Months Ended
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Mar. 31, 2025
Retirement Benefits [Abstract] |
Retirement Benefits | Retirement Benefits Components of Net Periodic Benefit (Credits) Costs See Note 1 — Basis of Presentation of our 2024 Form 10-K for additional information on where we report the service cost and other non-service cost (credit) components for all plans. The following tables present the components of our net periodic benefit (credit) cost, prior to capitalization and co-owner allocations, for the three months ended March 31, 2025 and 2024:
| Pension Benefits |  | OPEB |  | Total Pension Benefits and OPEB
| Three Months Ended March 31, |  | Three Months Ended March 31, |  | Three Months Ended March 31,
| 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024
Components of net periodic benefit (credit) cost: |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 21 |  |  | $ | 22 |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | 25 |  |  | $ | 26 |
Non-service components of pension benefits & OPEB (credit) cost: |  |  |  |  |  |  |  |  |  |  |
Interest cost | 102 |  |  | 95 |  |  | 19 |  |  | 18 |  |  | 121 |  |  | 113 |
Expected return on assets | (122) |  |  | (124) |  |  | (8) |  |  | (11) |  |  | (130) |  |  | (135) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |
Prior service (credit) cost | — |  |  | — |  |  | (2) |  |  | (2) |  |  | (2) |  |  | (2) |
Actuarial (gain) loss | 26 |  |  | 25 |  |  | (2) |  |  | (2) |  |  | 24 |  |  | 23 |
Settlement charges | — |  |  | 3 |  |  | — |  |  | — |  |  | — |  |  | 3 |
Non-service components of pension benefits & OPEB (credit) cost | 6 |  |  | (1) |  |  | 7 |  |  | 3 |  |  | 13 |  |  | 2 |
Net periodic benefit (credit) cost(a) | $ | 27 |  |  | $ | 21 |  |  | $ | 11 |  |  | $ | 7 |  |  | $ | 38 |  |  | $ | 28 |
__________ (a)For the three months ended March 31, 2025 and 2024, the pension benefit and OPEB service costs reflected in the Consolidated Statements of Operations and Comprehensive Income were $23 million and $24 million, respectively, and the non-service components of pension benefits and OPEB costs were $12 million and $2 million, respectively.

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