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Retirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2024
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs | 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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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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