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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Retirement Benefits [Abstract] |
Pension Plan and Other Postretirement Benefit Plan Obligations and Plan Assets and Includes a Statement of the Plans Funded Status | The following table summarizes the changes in pension plan and other postretirement benefit plan obligations and plan assets and includes a statement of the plans’ funded status for Dominion Energy:
|  | Pension Benefits |  |  | Other Postretirement Benefits |
Year Ended December 31, |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
(millions, except percentages) |  |  |  |  |  |  |  |  |  |  |  |
Changes in benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 8,066 |  |  | $ | 10,890 |  |  | $ | 1,127 |  |  | $ | 1,537 |
Service cost |  |  | 96 |  |  |  | 142 |  |  |  | 14 |  |  |  | 22 |
Interest cost |  |  | 442 |  |  |  | 333 |  |  |  | 61 |  |  |  | 45 |
Benefits paid |  |  | (493 | ) |  |  | (511 | ) |  |  | (94 | ) |  |  | (97 | )
Actuarial (gain) loss during the year |  |  | 322 |  |  |  | (2,716 | ) |  |  | 1 |  |  |  | (361 | )
Plan amendments |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | — |
Sale of Hope |  |  | — |  |  |  | (64 | ) |  |  | — |  |  |  | (19 | )
Settlements and curtailments(1) |  |  | (4 | ) |  |  | (8 | ) |  |  | — |  |  |  | — |
Benefit obligation at end of year |  | $ | 8,431 |  |  | $ | 8,066 |  |  | $ | 1,109 |  |  | $ | 1,127 |
Changes in fair value of plan assets: |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 8,694 |  |  | $ | 11,945 |  |  | $ | 1,845 |  |  | $ | 2,323 |
Actual return gain (loss) on plan assets |  |  | 882 |  |  |  | (2,556 | ) |  |  | 277 |  |  |  | (416 | )
Employer contributions |  |  | 8 |  |  |  | 9 |  |  |  | — |  |  |  | — |
Benefits paid |  |  | (493 | ) |  |  | (511 | ) |  |  | (60 | ) |  |  | (62 | )
Sale of Hope |  |  | — |  |  |  | (188 | ) |  |  | — |  |  |  | — |
Settlements(2) |  |  | (4 | ) |  |  | (5 | ) |  |  | — |  |  |  | — |
Fair value of plan assets at end of year |  | $ | 9,087 |  |  | $ | 8,694 |  |  | $ | 2,062 |  |  | $ | 1,845 |
Funded status at end of year |  | $ | 656 |  |  | $ | 628 |  |  | $ | 953 |  |  | $ | 718 |
Amounts recognized in the Consolidated Balance Sheets at December 31: |  |  |  |  |  |  |  |  |  |  |  |
Noncurrent pension and other postretirement benefit assets |  | $ | 647 |  |  | $ | 580 |  |  | $ | 1,132 |  |  | $ | 899 |
Noncurrent assets held for sale |  |  | 308 |  |  |  | 295 |  |  |  | 13 |  |  |  | 11 |
Other current liabilities |  |  | (27 | ) |  |  | (12 | ) |  |  | (13 | ) |  |  | (13 | )
Noncurrent pension and other postretirement benefit liabilities(3) |  |  | (237 | ) |  |  | (196 | ) |  |  | (179 | ) |  |  | (179 | )
Noncurrent liabilities held for sale |  |  | (35 | ) |  |  | (39 | ) |  |  | — |  |  |  | — |
Net amount recognized |  | $ | 656 |  |  | $ | 628 |  |  | $ | 953 |  |  | $ | 718 |
Significant assumptions used to determine benefit obligations as of December 31: |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  | 5.37%-5.47% |  |  | 5.65%-5.75% |  |  | 5.40%-5.42% |  |  | 5.69%-5.70% |
Weighted average rate of increase for compensation |  | 4.28% |  |  | 4.38% |  |  | n/a |  |  | n/a |
Crediting interest rate for cash balance and similar plans |  | 4.12%-4.22% |  |  | 4.40%-4.50% |  |  | n/a |  |  | n/a |
(1) 2023 and 2022 amounts include settlements of nonqualified pension obligations. 2022 amount includes a curtailment for Hope. (2) 2023 and 2022 amounts relate to settlements of nonqualified pension obligations. (3) Presented within other deferred credits and other liabilities in Dominion Energy's Consolidated Balance Sheets.
Benefit Obligation in Excess of Plan Asset | The following table provides information on the benefit obligations and fair value of plan assets for plans with a benefit obligation in excess of plan assets for Dominion Energy:
|  | Pension Benefits |  |  | Other Postretirement Benefits |
As of December 31, |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
(millions) |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation |  | $ | 7,996 |  |  | $ | 7,655 |  |  | $ | 195 |  |  | $ | 197 |
Fair value of plan assets |  |  | 7,697 |  |  |  | 7,410 |  |  |  | 4 |  |  |  | 5 |
Accumulated Benefit Obligation in Excess of Plan Assets | The following table provides information on the ABO and fair value of plan assets for Dominion Energy’s pension plans with an ABO in excess of plan assets:
As of December 31, |  | 2023 |  |  | 2022 |
(millions) |  |  |  |  |  |
Accumulated benefit obligation |  | $ | 792 |  |  | $ | 776 |
Fair value of plan assets |  |  | 654 |  |  |  | 623 |
Benefit Payments Expected Future Service | The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid for Dominion Energy’s plans:
|  | Estimated Future Benefit Payments |
|  | Pension Benefits |  |  | Other Postretirement Benefits |
(millions) |  |  |  |  |  |
2024 |  | $ | 556 |  |  | $ | 94 |
2025 |  |  | 546 |  |  |  | 91 |
2026 |  |  | 554 |  |  |  | 90 |
2027 |  |  | 562 |  |  |  | 89 |
2028 |  |  | 571 |  |  |  | 87 |
2029-2033 |  |  | 2,958 |  |  |  | 418 |
Fair Values of Pension and Post Retirement Plan Assets by Asset Category | The fair values of Dominion Energy’s pension plan assets by asset category are as follows:
At December 31, |  | 2023 |  |  | 2022 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 21 |  |  | $ | 9 |  |  | $ | — |  |  | $ | 30 |  |  | $ | 14 |  |  | $ | 11 |  |  | $ | — |  |  | $ | 25 |
Common and preferred stocks: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S.(1) |  |  | 1,145 |  |  |  | — |  |  |  | — |  |  |  | 1,145 |  |  |  | 1,653 |  |  |  | 170 |  |  |  | — |  |  |  | 1,823 |
International |  |  | 944 |  |  |  | 2 |  |  |  | — |  |  |  | 946 |  |  |  | 1,034 |  |  |  | 5 |  |  |  | — |  |  |  | 1,039 |
Insurance contracts |  |  | — |  |  |  | 162 |  |  |  | — |  |  |  | 162 |  |  |  | — |  |  |  | 166 |  |  |  | — |  |  |  | 166 |
Corporate debt instruments |  |  | 74 |  |  |  | 750 |  |  |  | — |  |  |  | 824 |  |  |  | 65 |  |  |  | 805 |  |  |  | — |  |  |  | 870 |
Government securities |  |  | 43 |  |  |  | 1,720 |  |  |  | — |  |  |  | 1,763 |  |  |  | 46 |  |  |  | 1,377 |  |  |  | — |  |  |  | 1,423 |
Total recorded at fair value |  | $ | 2,227 |  |  | $ | 2,643 |  |  | $ | — |  |  | $ | 4,870 |  |  | $ | 2,812 |  |  | $ | 2,534 |  |  | $ | — |  |  | $ | 5,346 |
Assets recorded at NAV(2): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commingled funds/collective trust funds |  |  |  |  |  |  |  |  |  |  |  | 2,012 |  |  |  |  |  |  |  |  |  |  |  |  | 1,780 |
Alternative investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate funds |  |  |  |  |  |  |  |  |  |  |  | 67 |  |  |  |  |  |  |  |  |  |  |  |  | 66 |
Private equity funds |  |  |  |  |  |  |  |  |  |  |  | 1,395 |  |  |  |  |  |  |  |  |  |  |  |  | 1,284 |
Debt funds |  |  |  |  |  |  |  |  |  |  |  | 236 |  |  |  |  |  |  |  |  |  |  |  |  | 192 |
Hedge funds |  |  |  |  |  |  |  |  |  |  |  | 239 |  |  |  |  |  |  |  |  |  |  |  |  | 2 |
Total recorded at NAV |  |  |  |  |  |  |  |  |  |  | $ | 3,949 |  |  |  |  |  |  |  |  |  |  |  | $ | 3,324 |
Total investments(3) |  |  |  |  |  |  |  |  |  |  | $ | 8,819 |  |  |  |  |  |  |  |  |  |  |  | $ | 8,670 |
(1) No amounts of Dominion Energy preferred stock were held at December 31, 2023. Includes $170 million of Dominion Energy preferred stock at December 31, 2022. (2) These investments that are measured at fair value using the NAV per share (or its equivalent) as a practical expedient are not required to be categorized in the fair value hierarchy. (3) Excludes net assets related to pending sales of securities of $298 million, net accrued income of $24 million, and includes net assets related to pending purchases of securities of $54 million at December 31, 2023. Excludes net assets related to pending sales of securities and advanced subscription of $177 million, net accrued income of $27 million, and includes net assets related to pending purchases of securities of $180 million at December 31, 2022. The fair values of Dominion Energy’s other postretirement plan assets by asset category are as follows:
At December 31, |  | 2023 |  |  | 2022 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
(millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 3 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 4 |  |  | $ | 3 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 4 |
Common and preferred stocks: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S.(1) |  |  | 757 |  |  |  | — |  |  |  | — |  |  |  | 757 |  |  |  | 685 |  |  |  | 10 |  |  |  | — |  |  |  | 695 |
International |  |  | 194 |  |  |  | — |  |  |  | — |  |  |  | 194 |  |  |  | 181 |  |  |  | — |  |  |  | — |  |  |  | 181 |
Insurance contracts |  |  | — |  |  |  | 10 |  |  |  | — |  |  |  | 10 |  |  |  | — |  |  |  | 10 |  |  |  | — |  |  |  | 10 |
Corporate debt instruments |  |  | 4 |  |  |  | 36 |  |  |  | — |  |  |  | 40 |  |  |  | 4 |  |  |  | 38 |  |  |  | — |  |  |  | 42 |
Government securities |  |  | 3 |  |  |  | 100 |  |  |  | — |  |  |  | 103 |  |  |  | 3 |  |  |  | 79 |  |  |  | — |  |  |  | 82 |
Total recorded at fair value |  | $ | 961 |  |  | $ | 147 |  |  | $ | — |  |  | $ | 1,108 |  |  | $ | 876 |  |  | $ | 138 |  |  | $ | — |  |  | $ | 1,014 |
Assets recorded at NAV(2): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commingled funds/collective trust funds |  |  |  |  |  |  |  |  |  |  |  | 725 |  |  |  |  |  |  |  |  |  |  |  |  | 649 |
Alternative investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate funds |  |  |  |  |  |  |  |  |  |  |  | 11 |  |  |  |  |  |  |  |  |  |  |  |  | 11 |
Private equity funds |  |  |  |  |  |  |  |  |  |  |  | 173 |  |  |  |  |  |  |  |  |  |  |  |  | 158 |
Debt funds |  |  |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |  |  |  |  |  |  |  |  | 11 |
Hedge funds |  |  |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |  |  |  |  |  |  |  |  | 0 |
Total recorded at NAV |  |  |  |  |  |  |  |  |  |  | $ | 937 |  |  |  |  |  |  |  |  |  |  |  | $ | 829 |
Total investments(3) |  |  |  |  |  |  |  |  |  |  | $ | 2,045 |  |  |  |  |  |  |  |  |  |  |  | $ | 1,843 |
(1) No amounts of Dominion Energy preferred stock were held at December 31, 2023. Includes $10 million of Dominion Energy preferred stock at December 31, 2022. (2) These investments that are measured at fair value using the NAV per share (or its equivalent) as a practical expedient are not required to be categorized in the fair value hierarchy. (3) Excludes net assets related to pending sales of securities and advanced subscription of $17 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $2 million at December 31, 2023. Excludes net assets related to pending sales of securities and advanced subscription of $10 million, net accrued income of $2 million, and includes net assets related to pending purchases of securities of $10 million at December 31, 2022.
Net Periodic Benefit (Credit) Cost and Amounts Recognized in Other Comprehensive Income and Regulatory Assets and Liabilities |
|  | Pension Benefits |  |  | Other Postretirement Benefits |
Year Ended December 31, |  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |
(millions, except percentages) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 96 |  |  | $ | 142 |  |  | $ | 170 |  |  | $ | 14 |  |  | $ | 22 |  |  | $ | 25 |
Interest cost |  |  | 442 |  |  |  | 333 |  |  |  | 317 |  |  |  | 61 |  |  |  | 45 |  |  |  | 46 |
Expected return on plan assets |  |  | (864 | ) |  |  | (886 | ) |  |  | (834 | ) |  |  | (151 | ) |  |  | (191 | ) |  |  | (173 | )
Amortization of prior service (credit) cost |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (36 | ) |  |  | (38 | ) |  |  | (42 | )
Amortization of net actuarial (gain) loss |  |  | — |  |  |  | 159 |  |  |  | 193 |  |  |  | (6 | ) |  |  | (2 | ) |  |  | 4 |
Settlements, curtailments and special termination benefits(1) |  |  | 1 |  |  |  | — |  |  |  | 10 |  |  |  | — |  |  |  | (8 | ) |  |  | — |
Net periodic benefit (credit) cost |  | $ | (325 | ) |  | $ | (252 | ) |  | $ | (144 | ) |  | $ | (118 | ) |  | $ | (172 | ) |  | $ | (140 | )
Changes in plan assets and benefit obligations recognized in other comprehensive income and regulatory assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current year net actuarial (gain) loss |  | $ | 304 |  |  | $ | 726 |  |  | $ | (782 | ) |  | $ | (125 | ) |  | $ | 246 |  |  | $ | (282 | )
Prior service (credit) cost |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (13 | )
Settlements and curtailments(1) |  |  | — |  |  |  | (3 | ) |  |  | (36 | ) |  |  | — |  |  |  | 10 |  |  |  | — |
Less amounts included in net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial gain (loss) |  |  | — |  |  |  | (159 | ) |  |  | (193 | ) |  |  | 6 |  |  |  | 2 |  |  |  | (4 | )
Amortization of prior service credit (cost) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 36 |  |  |  | 38 |  |  |  | 42 |
Sale of Hope |  |  | — |  |  |  | (47 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total recognized in other comprehensive income and regulatory assets and liabilities |  | $ | 306 |  |  | $ | 517 |  |  | $ | (1,011 | ) |  | $ | (83 | ) |  | $ | 296 |  |  | $ | (257 | )
Significant assumptions used to determine periodic cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  | 5.65%-5.75% |  |  | 3.06%-3.19% |  |  | 2.73%-3.29% |  |  | 5.69%-5.70% |  |  | 3.04%-5.03% |  |  | 2.69%-2.80% |
Expected long-term rate of return on plan assets |  | 7.00%-8.35% |  |  | 7.00%-8.35% |  |  | 7.00%-8.45% |  |  | 8.35% |  |  | 8.35% |  |  | 8.45% |
Weighted average rate of increase for compensation |  | 4.38% |  |  | 4.51% |  |  | 4.53% |  |  | n/a |  |  | n/a |  |  | n/a |
Crediting interest rate for cash balance and similar plans |  | 4.40%-4.50% |  |  | 1.81%-1.94% |  |  | 1.93%-2.15% |  |  | n/a |  |  | n/a |  |  | n/a |
Healthcare cost trend rate(2) |  |  |  |  |  |  |  |  |  |  | 7.00% |  |  | 6.25% |  |  | 6.25% |
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)(2) |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  | 5.00% |  |  | 5.00% |
Year that the rate reaches the ultimate trend rate(2) |  |  |  |  |  |  |  |  |  |  | 2030 |  |  | 2026-2027 |  |  | 2026-2027 |
(1) 2023 and 2021 amounts relate primarily to the Dominion Energy executive nonqualified pension plan. 2022 amounts relate primarily to Dominion Energy’s sale of Hope. (2) Assumptions used to determine net periodic cost for the following year.
Components of AOCI and Regulatory Assets and Liabilities that have Not been Recognized as Components of Periodic Benefit (Credit) Cost | The components of AOCI and regulatory assets and liabilities for Dominion Energy’s plans that have not been recognized as components of net periodic benefit (credit) cost are as follows:
|  | Pension Benefits |  |  | Other Postretirement Benefits |
At December 31, |  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
(millions) |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss (gain) |  | $ | 3,018 |  |  | $ | 2,714 |  |  | $ | (35 | ) |  | $ | 84 |
Prior service (credit) cost |  |  | 5 |  |  |  | 3 |  |  |  | (121 | ) |  |  | (157 | )
Total(1) |  | $ | 3,023 |  |  | $ | 2,717 |  |  | $ | (156 | ) |  | $ | (73 | )
(1) As of December 31, 2023, of the $3.0 billion and $(156) million related to pension benefits and other postretirement benefits, $1.8 billion and $(38) million, respectively, are included in AOCI, with the remainder included in regulatory assets and liabilities, except for $173 million presented in assets and liabilities held for sale. As of December 31, 2022, of the $2.7 billion and $(73) million related to pension benefits and other postretirement benefits, $1.7 billion and $14 million, respectively, are included in AOCI, with the remainder included in regulatory assets and liabilities, except for $170 million presented in assets and liabilities held for sale.

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- Definition Tabular disclosure of the change in the benefit obligation, fair value of plan assets, and funded status of pension plans or other employee benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Subparagraph (a)(b)(c) -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of benefit obligation and plan assets of defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-3 + Details
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- Definition Tabular disclosure of benefit obligation and plan assets for defined benefit pension plan with projected benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-3 + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (b) -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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