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Employee Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2025
Retirement Benefits [Abstract] |
Components of Provision for Net Periodic Benefit (Credit) Cost | The components of Dominion Energy’s provision for net periodic benefit (credit) cost are as follows:
|  | Pension Benefits |  |  | Other Postretirement Benefits |
|  | Quarter-to-Date |  |  | Year-to-Date |  |  | Quarter-to-Date |  |  | Year-to-Date |
Period Ended June 30, |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 19 |  |  | $ | 22 |  |  | $ | 38 |  |  | $ | 44 |  |  | $ | 2 |  |  | $ | 3 |  |  | $ | 5 |  |  | $ | 6 |
Interest cost |  |  | 109 |  |  |  | 108 |  |  |  | 217 |  |  |  | 217 |  |  |  | 15 |  |  |  | 14 |  |  |  | 29 |  |  |  | 28 |
Expected return on plan assets |  |  | (169 | ) |  |  | (207 | ) |  |  | (338 | ) |  |  | (411 | ) |  |  | (40 | ) |  |  | (43 | ) |  |  | (80 | ) |  |  | (85 | )
Amortization of prior service (credit) cost |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (7 | ) |  |  | (9 | ) |  |  | (13 | ) |  |  | (18 | )
Net actuarial (gain) loss |  |  | — |  |  |  | 22 |  |  |  | — |  |  |  | (148 | ) |  |  | — |  |  |  | (37 | ) |  |  | — |  |  |  | (69 | )
Curtailments(1) |  |  | — |  |  |  | (25 | ) |  |  | — |  |  |  | (56 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (4 | )
Plan amendment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 22 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net periodic benefit (credit) cost |  | $ | (41 | ) |  | $ | (80 | ) |  | $ | (83 | ) |  | $ | (332 | ) |  | $ | (30 | ) |  | $ | (72 | ) |  | $ | (59 | ) |  | $ | (142 | )
(1) 2024 amounts relate primarily to the East Ohio Transaction.

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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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