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Employee Benefit Plans (Narrative) (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Accumulated benefit obligation |  |  | $ 8,100,000,000 | $ 7,700,000,000 |
Defined contribution plan, employer matching contributions |  |  | 85,000,000 | 75,000,000 | $ 65,000,000
Discontinued Operations |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Service cost |  |  | 18,000,000 | 25,000,000 | 28,000,000
Non-service cost |  |  | $ (46,000,000) | (43,000,000) | (34,000,000)
Common and Preferred Stocks |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Defined benefit plan, actual plan asset allocation percentages |  |  | 26.00% |  |
Non-U.S. Equity |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Defined benefit plan, actual plan asset allocation percentages |  |  | 19.00% |  |
Fixed Income Funds |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Defined benefit plan, actual plan asset allocation percentages |  |  | 32.00% |  |
Real Assets |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Defined benefit plan, actual plan asset allocation percentages |  |  | 3.00% |  |
Other than Securities Investment |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Defined benefit plan, actual plan asset allocation percentages |  |  | 20.00% |  |
Virginia Electric and Power Company |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Defined contribution plan, employer matching contributions |  |  | $ 26,000,000 | 22,000,000 | 20,000,000
Pension Plans and Post Retirement Benefit Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Actual return (loss) on pension and other postretirement plan assets |  |  | 1,200,000,000 | (3,000,000,000) |
Expected return on pension and other postretirement plan assets |  |  | 1,000,000,000 | 1,100,000,000 |
Pension Benefits |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Actual return (loss) on pension and other postretirement plan assets |  |  | 882,000,000 | (2,556,000,000) |
Expected return on pension and other postretirement plan assets |  |  | 864,000,000 | 886,000,000 | 834,000,000
Increase to net periodic benefit cost (credit) |  |  | (325,000,000) | (252,000,000) | (144,000,000)
Actuarial gains (losses) from increase decrease in discount rate |  |  | 322,000,000 | 2,700,000,000 |
Contributions to qualified defined benefit pension plans |  |  | 8,000,000 | 9,000,000 |
Expected contributions to qualified defined benefit pension plans in next fiscal year |  | $ 46,000,000 |  |  |
Service cost |  |  | 96,000,000 | 142,000,000 | 170,000,000
Pension Benefits | Virginia Electric and Power Company | Amounts Associated With Dominion Pension Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Payment made to Dominion |  |  |  | 172,000,000 | 151,000,000
Pension Benefits | Virginia Electric and Power Company | Other Operations and Maintenance |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Increase to net periodic benefit cost (credit) |  |  | 34,000,000 | 72,000,000 | 86,000,000
Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Actual return (loss) on pension and other postretirement plan assets |  |  | 277,000,000 | (416,000,000) |
Expected return on pension and other postretirement plan assets |  |  | 151,000,000 | 191,000,000 | 173,000,000
Increase to net periodic benefit cost (credit) |  |  | $ (118,000,000) | $ (172,000,000) | $ (140,000,000)
Health care cost trend decreased rate | [1] |  | 5.00% | 5.00% | 5.00%
Actuarial gain (loss) by offset of decrease in discount rate from favorable claims and other |  |  | $ 28,000,000 |  |
Actuarial gains (losses) from increase decrease in capital claims expense and other expense |  |  | 1,000,000 |  |
Actuarial gains (losses) from increase decrease in discount rate |  |  | 29,000,000 | $ 360,000,000 |
Contribution to voluntary employees beneficiary association |  |  |  |  | $ 0
Service cost |  |  | 14,000,000 | 22,000,000 | 25,000,000
Other Postretirement Benefits | Virginia Electric and Power Company |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Contribution to voluntary employees beneficiary association |  |  | 0 | 0 | 0
Other Postretirement Benefits | Virginia Electric and Power Company | Forecast |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Contribution to voluntary employees beneficiary association |  | $ 0 |  |  |
Other Postretirement Benefits | Virginia Electric and Power Company | Other Operations and Maintenance | Dominion Energy Retiree Health And Welfare Plan [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Increase to net periodic benefit cost (credit) |  |  | $ (60,000,000) | $ (81,000,000) | $ (72,000,000)
[1] | Assumptions used to determine net periodic cost for the following year.

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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