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Retirement Benefits | 9 Months Ended
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Sep. 30, 2024
Retirement Benefits [Abstract] |
Retirement Benefits | Retirement Benefits Components of Net Periodic Benefit (Credits) Costs See Note 1 — Basis of Presentation of our 2023 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 and nine months ended September 30, 2024 and 2023:
| Pension Benefits |  | OPEB |  | Total Pension Benefits and OPEB
| Three Months Ended September 30, |  | Three Months Ended September 30, |  | Three Months Ended September 30,
| 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Components of net periodic benefit (credit) cost |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 22 |  |  | $ | 22 |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | 26 |  |  | $ | 26 |
Non-service components of pension benefits & OPEB (credit) cost |  |  |  |  |  |  |  |  |  |  |
Interest cost | 95 |  |  | 99 |  |  | 18 |  |  | 19 |  |  | 113 |  |  | 118 |
Expected return on assets | (123) |  |  | (127) |  |  | (11) |  |  | (11) |  |  | (134) |  |  | (138) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |
Prior service (credit) cost | 1 |  |  | — |  |  | (2) |  |  | (2) |  |  | (1) |  |  | (2) |
Actuarial (gain) loss | 25 |  |  | 12 |  |  | (3) |  |  | (3) |  |  | 22 |  |  | 9 |
Settlement charges | 3 |  |  | — |  |  | — |  |  | — |  |  | 3 |  |  | — |
Non-service components of pension benefits & OPEB (credit) cost | 1 |  |  | (16) |  |  | 2 |  |  | 3 |  |  | 3 |  |  | (13) |
Net periodic benefit (credit) cost(a) | $ | 23 |  |  | $ | 6 |  |  | $ | 6 |  |  | $ | 7 |  |  | $ | 29 |  |  | $ | 13 |
| Pension Benefits |  | OPEB |  | Total Pension Benefits and OPEB
| Nine Months Ended September 30, |  | Nine Months Ended September 30, |  | Nine Months Ended September 30,
| 2024 |  | 2023 |  | 2024 |  | 2023 |  | 2024 |  | 2023
Components of net periodic benefit (credit) cost: |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 67 |  |  | $ | 67 |  |  | $ | 13 |  |  | $ | 12 |  |  | $ | 80 |  |  | $ | 79 |
Non-service components of pension benefits & OPEB (credit) cost: |  |  |  |  |  |  |  |  |  |  |
Interest cost | 286 |  |  | 296 |  |  | 54 |  |  | 56 |  |  | 340 |  |  | 352 |
Expected return on assets | (371) |  |  | (381) |  |  | (32) |  |  | (34) |  |  | (403) |  |  | (415) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |
Prior service (credit) cost | 1 |  |  | — |  |  | (5) |  |  | (5) |  |  | (4) |  |  | (5) |
Actuarial (gain) loss | 76 |  |  | 35 |  |  | (7) |  |  | (10) |  |  | 69 |  |  | 25 |
Settlement charges | 7 |  |  | — |  |  | — |  |  | — |  |  | 7 |  |  | — |
Non-service components of pension benefits & OPEB (credit) cost | (1) |  |  | (50) |  |  | 10 |  |  | 7 |  |  | 9 |  |  | (43) |
Net periodic benefit (credit) cost(a) | $ | 66 |  |  | $ | 17 |  |  | $ | 23 |  |  | $ | 19 |  |  | $ | 89 |  |  | $ | 36 |
__________ (a)The pension benefit and OPEB service costs reflected in the Consolidated Statements of Operations and Comprehensive Income is $24 million and $74 million for the three and nine months ended September 30, 2024, respectively, and $24 million and $71 million for the three and nine months ended September 30, 2023, respectively.

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