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Employee Benefit Plans (Narrative) (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2025 | 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 |  |  | $ 7,400,000,000 | $ 8,100,000,000 |  |
Defined contribution plan, employer matching contributions |  |  | 82,000,000 | 85,000,000 | $ 75,000,000 |
Defined contribution plan operating expenses within discontinued operations | $ 23,000,000 |  |  |  |  |
Defined contribution plan operating expenses within discontinued operations after tax | 17,000,000 |  |  |  |  |
Defined contribution plan other operations and maintenance expense | 13,000,000 |  |  |  |  |
Defined contribution plan other operations and maintenance expense after tax | $ 10,000,000 |  |  |  |  |
East Ohio and Questar Gas Transactions |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Remeasured pension and other postretirement benefit plans amount |  |  | 217,000,000 |  |  |
Remeasured pension and other postretirement benefit plans after tax amount |  |  | 162,000,000 |  |  |
Discontinued Operations |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Service cost |  |  | 5,000,000 | 18,000,000 | 25,000,000 |
Non-service cost |  |  | $ 12,000,000 | (46,000,000) | (81,000,000) |
U.S. Equity |  |  |  |  |  |
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 |  |  | $ 29,000,000 | 26,000,000 | 22,000,000 |
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 |  |  | 738,000,000 | 1,200,000,000 |  |
Expected return on pension and other postretirement plan assets |  |  | 982,000,000 | 1,000,000,000 |  |
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 |  |  | 503,000,000 | 882,000,000 |  |
Expected return on pension and other postretirement plan assets |  |  | 811,000,000 | 864,000,000 | 886,000,000 |
Increase to net periodic benefit cost (credit) |  |  | (426,000,000) | (22,000,000) | 312,000,000 |
Actuarial gains (losses) from increase decrease in discount rate |  |  | 404,000,000 | 322,000,000 |  |
Service cost |  |  | $ 83,000,000 | 96,000,000 | 142,000,000 |
Pension Benefits | Closure of East Ohio Transaction |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Remeasurement, discount rate |  |  | 5.62% |  |  |
Pension Benefits | Questar Gas Transactions |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Remeasurement, discount rate |  |  | 5.75% |  |  |
Pension Benefits | Forecast |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Expected contributions to qualified defined benefit pension plans in next fiscal year |  | $ 22,000,000 |  |  |  |
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 |
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) |  |  | $ 49,000,000 | $ 34,000,000 | 72,000,000 |
Pension Benefits | Minimum |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Remeasurement, discount rate |  |  | 5.84% | 5.37% |  |
Pension Benefits | Maximum |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Remeasurement, discount rate |  |  | 5.87% | 5.47% |  |
Other Postretirement Benefits Plan |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Actual return (loss) on pension and other postretirement plan assets |  |  | $ 235,000,000 | $ 277,000,000 |  |
Expected return on pension and other postretirement plan assets |  |  | 171,000,000 | 151,000,000 | 191,000,000 |
Increase to net periodic benefit cost (credit) |  |  | (250,000,000) | (237,000,000) | 76,000,000 |
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 |  |  | 43,000,000 | 29,000,000 |  |
Contribution to voluntary employees beneficiary association |  |  |  |  |  | $ 0
Service cost |  |  | $ 11,000,000 | 14,000,000 | 22,000,000 |
Other Postretirement Benefits Plan | Questar Gas Transactions |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Remeasurement, discount rate |  |  | 5.74% |  |  |
Other Postretirement Benefits Plan | 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 Plan | 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 Plan | 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) |  |  | $ (72,000,000) | $ (60,000,000) | $ (81,000,000) |
Other Postretirement Benefits Plan | Minimum |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Remeasurement, discount rate |  |  | 5.83% | 5.40% |  |
Other Postretirement Benefits Plan | Minimum | Closure of East Ohio Transaction |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Remeasurement, discount rate |  |  | 5.61% |  |  |
Other Postretirement Benefits Plan | Maximum |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Remeasurement, discount rate |  |  | 5.86% | 5.42% |  |
Other Postretirement Benefits Plan | Maximum | Closure of East Ohio Transaction |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Remeasurement, discount rate |  |  | 5.62% |  |  |
Revised Long-term Strategic Target Asset | Public equity |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined benefit plan, actual plan asset allocation percentages |  |  | 30.00% |  |  |
Revised Long-term Strategic Target Asset | Fixed Income Funds |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |
Defined benefit plan, actual plan asset allocation percentages |  |  | 27.00% |  |  |
Revised Long-term Strategic Target Asset | 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 |  |  | 43.00% |  |  |

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