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Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Employee Benefit Plans | Note 20. Employee Benefit Plans Net Periodic Benefit (Credit) Cost The service cost component of net periodic benefit (credit) cost is reflected in other operations and maintenance expense in Dominion Energy’s Consolidated Statements of Income, except for less than $1 million and $5 million for the three and nine months ended September 30, 2024, respectively, presented in discontinued operations. The non-service cost components of net periodic benefit (credit) cost are reflected in other income (expense) in Dominion Energy’s Consolidated Statements of Income, except for $— million and $13 million for the three and nine months ended September 30, 2024, respectively, presented in discontinued operations. 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 September 30, |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 19 |  |  | $ | 19 |  |  | $ | 57 |  |  | $ | 63 |  |  | $ | 3 |  |  | $ | 2 |  |  | $ | 8 |  |  | $ | 8 |
Interest cost |  |  | 108 |  |  |  | 107 |  |  |  | 325 |  |  |  | 324 |  |  |  | 13 |  |  |  | 15 |  |  |  | 42 |  |  |  | 43 |
Expected return on plan assets |  |  | (170 | ) |  |  | (200 | ) |  |  | (508 | ) |  |  | (611 | ) |  |  | (39 | ) |  |  | (43 | ) |  |  | (119 | ) |  |  | (128 | )
Amortization of prior service (credit) cost |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  | (6 | ) |  |  | (9 | ) |  |  | (19 | ) |  |  | (27 | )
Net actuarial (gain) loss |  |  | — |  |  |  | (23 | ) |  |  | — |  |  |  | (171 | ) |  |  | — |  |  |  | 11 |  |  |  | — |  |  |  | (58 | )
Curtailments(1) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (56 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (4 | )
Plan amendment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 22 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net periodic benefit (credit) cost |  | $ | (42 | ) |  | $ | (96 | ) |  | $ | (125 | ) |  | $ | (428 | ) |  | $ | (29 | ) |  | $ | (24 | ) |  | $ | (88 | ) |  | $ | (166 | )
(1) 2024 amounts relate primarily to the East Ohio Transaction. Pension and Other Postretirement Benefit Plan Remeasurements As a result of the East Ohio Transaction, in the first quarter of 2024 Dominion Energy remeasured its pension and other postretirement benefit plans. The remeasurement resulted in $202 million ($151 million after-tax) of higher market related impacts on pension and other postretirement plans related to the East Ohio Transaction, reflected in other income (expense) in Dominion Energy’s Consolidated Statement of Income. The discount rates used for the remeasurement related to the East Ohio Transaction were 5.62% for the pension plans and 5.61%-5.62% for the other postretirement benefit plans, respectively. All other assumptions used for the remeasurements were consistent with the measurement as of December 31, 2023. As a result of the Questar Gas Transaction, in the second quarter of 2024 Dominion Energy remeasured its pension and other postretirement benefit plans. The remeasurement resulted in $15 million ($11 million after-tax) of higher market related impacts on pension and other postretirement plans related to the Questar Gas Transaction, reflected in other income (expense) in Dominion Energy’s Consolidated Statement of Income. The discount rates used for the remeasurement related to the Questar Gas Transaction were 5.75% for the pension plan and 5.74% for the other postretirement benefit plan, respectively. All other assumptions used for the remeasurements were consistent with the measurement as of December 31, 2023. Employer Contributions During the three and nine months ended September 30, 2025, Dominion Energy made $9 million and $16 million, respectively, of contributions to its qualified defined benefit pension plans. Dominion Energy expects to make $19 million of minimum required contributions to its qualified defined benefit pension plans in 2025. Dominion Energy is not required to make any contributions to its VEBAs associated with its other postretirement plans in 2025. Dominion Energy considers voluntary contributions from time to time, either in the form of cash or equity securities. Other Employee Matters In the first quarter of 2024, Dominion Energy recorded a charge of $23 million ($17 million after-tax) within discontinued operations attributable to a contribution to its defined contribution employee savings plan associated with the closing of the East Ohio Transaction. Additionally, in the first quarter of 2024, Dominion Energy recorded a charge of $13 million ($10 million after-tax) in other operations and maintenance expense related to a severance accrual for certain employees in connection with the business review.

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