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Employee Benefit Plans (Narrative) (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Accumulated benefit obligation |  | $ 10,200,000,000 |  | $ 10,200,000,000 |  | $ 7,700,000,000 | $ 10,200,000,000 |
Defined contribution plan, employer matching contributions |  |  |  |  |  | $ 75,000,000 | 65,000,000 | $ 67,000,000
Discontinued Operations |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Service cost |  |  |  |  |  |  | 1,000,000 | 13,000,000
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% |  |
Series C Preferred Stock |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Issued to qualified defined benefit pension plans, shares |  | 250,000 |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Amounts due to Dominion |  | $ 121,000,000 |  | 121,000,000 |  | $ 255,000,000 | 121,000,000 |
Defined contribution plan, employer matching contributions |  |  |  |  |  | 22,000,000 | 20,000,000 | 19,000,000
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 |  |  |  |  |  | 3,000,000,000.0 | 1,500,000,000 |
Expected return on pension and other postretirement plan assets |  |  |  |  |  | 1,100,000,000 | 1,000,000,000.0 |
Curtailment resulted in a decrease in the pension benefit obligation |  |  |  | 26,000,000 |  |  |  |
Increase to net periodic benefit cost (credit) |  |  |  | $ 2,000,000 |  |  |  |
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 |  |  |  |  |  | (2,556,000,000) | 1,202,000,000 |
Expected return on pension and other postretirement plan assets |  |  |  |  |  | 886,000,000 | 834,000,000 | 777,000,000
Increase to net periodic benefit cost (credit) |  |  |  |  |  | (252,000,000) | (144,000,000) | (32,000,000)
Actuarial gains (losses) from increase decrease in discount rate |  |  |  |  |  | 2,700,000,000 | 413,000,000 |
Contributions to qualified defined benefit pension plans |  |  | $ 250,000,000 |  |  | 9,000,000 | 284,000,000 |
Service cost |  |  |  |  |  | 142,000,000 | 170,000,000 | 173,000,000
Pension Benefits | Series C Preferred Stock |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Contributions to qualified defined benefit pension plans |  | $ 250,000,000 |  |  |  |  |  |
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 | 313,000,000
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) |  |  |  |  |  | 72,000,000 | 86,000,000 | 118,000,000
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 |  |  |  |  |  | (416,000,000) | 294,000,000 |
Expected return on pension and other postretirement plan assets |  |  |  |  |  | 191,000,000 | 173,000,000 | 156,000,000
Increase to net periodic benefit cost (credit) |  |  |  |  |  | $ (172,000,000) | $ (140,000,000) | $ (172,000,000)
Health care cost trend decreased rate | [1] | 5.00% | 5.00% | 5.00% |  | 5.00% | 5.00% | 5.00%
Actuarial gains (losses) from increase decrease in discount rate |  |  |  |  |  | $ 360,000,000 | $ 161,000,000 |
Contribution to voluntary employees beneficiary association |  |  |  |  |  |  | 0 |
Service cost |  |  |  |  |  | 22,000,000 | 25,000,000 | $ 28,000,000
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) |  |  |  |  |  | $ (81,000,000) | $ (72,000,000) | $ (58,000,000)
[1] | Assumptions used to determine net periodic cost for the following year.

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