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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2023
Retirement Benefits [Abstract] |
Net Periodic Benefit Cost (Credit) | 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 $4 million and $12 million for the three and nine months ended September 30, 2023, respectively, and $7 million and $19 million for the three and nine months ended September 30, 2022, 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 $(11) million and $(34) million for the three and nine months ended September 30, 2023, respectively, and $(11) million and $(32) million for the three and nine months ended September 30, 2022, 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, |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 24 |  |  | $ | 35 |  |  | $ | 72 |  |  | $ | 106 |  |  | $ | 3 |  |  | $ | 5 |  |  | $ | 10 |  |  | $ | 16 |
Interest cost |  |  | 111 |  |  |  | 83 |  |  |  | 332 |  |  |  | 250 |  |  |  | 15 |  |  |  | 11 |  |  |  | 46 |  |  |  | 34 |
Expected return on plan assets |  |  | (216 | ) |  |  | (221 | ) |  |  | (648 | ) |  |  | (667 | ) |  |  | (37 | ) |  |  | (47 | ) |  |  | (113 | ) |  |  | (143 | )
Amortization of prior service cost (credit) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (10 | ) |  |  | (10 | ) |  |  | (28 | ) |  |  | (29 | )
Amortization of net actuarial (gain) loss |  |  | — |  |  |  | 39 |  |  |  | — |  |  |  | 119 |  |  |  | (1 | ) |  |  | — |  |  |  | (4 | ) |  |  | (1 | )
Curtailment(1) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (8 | ) |  |  | — |  |  |  | (8 | )
Net periodic benefit (credit) cost |  | $ | (81 | ) |  | $ | (64 | ) |  | $ | (244 | ) |  | $ | (192 | ) |  | $ | (30 | ) |  | $ | (49 | ) |  | $ | (89 | ) |  | $ | (131 | )
(1) 2022 amounts relate primarily to Dominion Energy's sale of Hope.

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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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