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Employee Benefit Plans (Net Periodic Benefit (Credit) Cost and Amounts Recognized in Other Comprehensive Income and Regulatory Assets and Liabilities) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pension Benefits |  |  |  |  |
Service cost |  | $ 96 | $ 142 | $ 170 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) |
Interest cost |  | $ 442 | $ 333 | $ 317 |
Expected return on plan assets |  | (864) | (886) | (834) |
Amortization of net actuarial (gain) loss |  |  | 159 | 193 |
Settlements, curtailments and special termination benefits | [1] | 1 |  | 10 |
Net periodic benefit (credit) cost |  | (325) | (252) | (144) |
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) |
Prior service (credit) cost |  | 2 |  |  |
Settlements and curtailments | [1] |  | (3) | (36) |
Amortization of net actuarial gain (loss) |  |  | (159) | (193) |
Sale of hope |  |  | (47) |  |
Total recognized in other comprehensive income and regulatory assets and liabilities |  | $ 306 | $ 517 | $ (1,011) |
Significant assumptions used to determine periodic cost: |  |  |  |  |
Weighted average rate of increase for compensation |  | 4.38% | 4.51% | 4.53% |
Pension Benefits | Minimum |  |  |  |  |
Significant assumptions used to determine periodic cost: |  |  |  |  |
Discount rate |  | 5.65% | 3.06% | 2.73% |
Expected long-term rate of return on plan assets |  | 7.00% | 7.00% | 7.00% |
Crediting interest rate for cash balance and similar plans |  | 4.40% | 1.81% | 1.93% |
Pension Benefits | Maximum |  |  |  |  |
Significant assumptions used to determine periodic cost: |  |  |  |  |
Discount rate |  | 5.75% | 3.19% | 3.29% |
Expected long-term rate of return on plan assets |  | 8.35% | 8.35% | 8.45% |
Crediting interest rate for cash balance and similar plans |  | 4.50% | 1.94% | 2.15% |
Other Postretirement Benefits |  |  |  |  |
Service cost |  | $ 14 | $ 22 | $ 25 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense)
Interest cost |  | $ 61 | $ 45 | $ 46 |
Expected return on plan assets |  | (151) | (191) | (173) |
Amortization of prior service (credit) cost |  | (36) | (38) | (42) |
Amortization of net actuarial (gain) loss |  | (6) | 2 | 4 |
Settlements, curtailments and special termination benefits | [1] |  | (8) |  |
Net periodic benefit (credit) cost |  | (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 |  | (125) | 246 | (282) |
Prior service (credit) cost |  |  |  | (13) |
Settlements and curtailments | [1] |  | 10 |  |
Amortization of net actuarial gain (loss) |  | 6 | 2 | (4) |
Amortization of prior service credit (cost) |  | 36 | 38 | 42 |
Total recognized in other comprehensive income and regulatory assets and liabilities |  | $ (83) | $ 296 | $ (257) |
Significant assumptions used to determine periodic cost: |  |  |  |  |
Expected long-term rate of return on plan assets |  | 8.35% | 8.35% | 8.45% |
Health care 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 |  |  |
Other Postretirement Benefits | Minimum |  |  |  |  |
Significant assumptions used to determine periodic cost: |  |  |  |  |
Discount rate |  | 5.69% | 3.04% | 2.69% |
Year that the rate reaches the ultimate trend rate | [2] |  | 2026 | 2026 |
Other Postretirement Benefits | Maximum |  |  |  |  |
Significant assumptions used to determine periodic cost: |  |  |  |  |
Discount rate |  | 5.70% | 5.03% | 2.80% |
Year that the rate reaches the ultimate trend rate | [2] |  | 2027 | 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.

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted-average interest crediting rate used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (l) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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