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Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2024
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, and $4 million and $12 million for the three and nine months ended September 30, 2023, 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, and $(11) million and $(34) million for the three and nine months ended September 30, 2023, respectively, presented in discontinued operations. The components of Dominion Energy’s provision for net periodic benefit cost (credit) are as follows:
|  | Pension Benefits |  |  | Other Postretirement Benefits |
|  | Quarter-to-Date |  |  | Year-to-Date |  |  | Quarter-to-Date |  |  | Year-to-Date |
Period Ended September 30, |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 19 |  |  | $ | 24 |  |  | $ | 63 |  |  | $ | 72 |  |  | $ | 2 |  |  | $ | 3 |  |  | $ | 8 |  |  | $ | 10 |
Interest cost |  |  | 107 |  |  |  | 111 |  |  |  | 324 |  |  |  | 332 |  |  |  | 15 |  |  |  | 15 |  |  |  | 43 |  |  |  | 46 |
Expected return on plan assets |  |  | (200 | ) |  |  | (216 | ) |  |  | (611 | ) |  |  | (648 | ) |  |  | (43 | ) |  |  | (37 | ) |  |  | (128 | ) |  |  | (113 | )
Amortization of prior service cost (credit) |  |  | 1 |  |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | (9 | ) |  |  | (10 | ) |  |  | (27 | ) |  |  | (28 | )
Amortization of net actuarial (gain) loss |  |  | 3 |  |  |  | — |  |  |  | 16 |  |  |  | — |  |  |  | (1 | ) |  |  | (1 | ) |  |  | (5 | ) |  |  | (4 | )
Settlements and curtailments(1) |  |  | — |  |  |  | — |  |  |  | 4 |  |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | (1 | ) |  |  | — |
Plan amendment |  |  | — |  |  |  | — |  |  |  | 22 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net periodic benefit (credit) cost |  | $ | (70 | ) |  | $ | (81 | ) |  | $ | (181 | ) |  | $ | (244 | ) |  | $ | (37 | ) |  | $ | (30 | ) |  | $ | (110 | ) |  | $ | (89 | )
(1) 2024 amount relates to Dominion Energy nonqualified pension plan. Pension and Other Postretirement Benefit Plan Remeasurements In the first quarter of 2024, Dominion Energy remeasured its pension and other postretirement benefit plans as a result of the close of the East Ohio Transaction. The remeasurement and transfer to Enbridge of pension plan assets and liabilities resulted in a decrease in the pension benefit obligation of $419 million, inclusive of $195 million transferred upon closing, and a decrease in the fair value of the pension plan assets of $555 million, inclusive of $531 million transferred upon closing. In addition, the remeasurement and transfer to Enbridge of other postretirement benefit plan assets and liabilities resulted in a decrease in the accumulated postretirement benefit obligation of $38 million, inclusive of $22 million transferred upon closing, and a decrease in the fair value of the other postretirement benefit plan assets of $19 million, inclusive of $36 million transferred upon closing. The impact of the remeasurement and transfer of pension and other postretirement benefit plan assets and liabilities on net periodic benefit cost (credit) was recognized prospectively from the remeasurement date. The remeasurement is expected to decrease the net periodic pension benefit credit by approximately $11 million and increase the net periodic other postretirement benefit credit by approximately $1 million for the year ending December 31, 2024, excluding the impact of a one-time plan amendment. The discount rate used for the remeasurement was 5.62% for the pension plans and 5.61%-5.62% for the other postretirement benefit plans. The net actuarial loss (gain) and prior service cost (credit) related to the transferred pension and other postretirement plan assets and liabilities included in the East Ohio Transaction loss on sale was $147 million for pension and $(9) million for other postretirement benefits. In the second quarter of 2024, Dominion Energy remeasured its pension and other postretirement benefit plans as a result of the close of the Questar Gas Transaction. The remeasurement and transfer to Enbridge of pension plan assets and liabilities resulted in a decrease in the pension benefit obligation of $251 million, inclusive of $136 million transferred upon closing, and a decrease in the fair value of the pension plan assets of $248 million, inclusive of $138 million transferred upon closing. In addition, the remeasurement and transfer to Enbridge of other postretirement benefit plan assets and liabilities resulted in a decrease in the accumulated postretirement benefit obligation of $14 million, inclusive of $6 million transferred upon closing, and an increase in the fair value of the other postretirement benefit plan assets of $24 million, inclusive of $5 million transferred upon closing. The impact of the remeasurement and transfer of pension and other postretirement benefit plan assets and liabilities on net periodic benefit cost (credit) was recognized prospectively from the remeasurement date. The remeasurement is expected to increase the net periodic pension benefit credit by approximately $8 million and increase the net periodic other postretirement benefit credit by $3 million for the year ending December 31, 2024. The discount rate used for the remeasurement was 5.75% for the pension plan and 5.74% for the other postretirement benefit plan. The net actuarial loss and prior service cost (credit) related to the transferred pension and other postretirement plan assets and liabilities included in the Questar Gas Transaction loss on sale was $49 million for pension and $1 million for other postretirement benefits. 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, 2024, Dominion Energy made $33 million and $40 million of contributions to its qualified defined benefit pension plans. In October 2024, Dominion Energy made an additional $6 million of contributions to its qualified defined benefit pension plans. Dominion Energy is not required to make any additional contributions to its qualified defined benefit pension plans in 2024. Dominion Energy is not required to make any contributions to its VEBAs associated with its other postretirement plans in 2024. 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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