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Regulatory Matters (Narrative) (Detail) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jul. 31, 2023 USD ($) shares | May 31, 2023 USD ($) | Apr. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) mi kV | Feb. 28, 2023 USD ($) | Jan. 31, 2023 USD ($) | Oct. 31, 2022 USD ($) MW | Jun. 30, 2022 USD ($) | May 31, 2022 USD ($) | Mar. 31, 2022 | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) Components Project | Jun. 30, 2022 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2011 | Dec. 31, 2008
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory liabilities |  |  |  |  |  |  |  |  |  |  | $ 583 |  |  | $ 583 |  |  | $ 946 | [1] |  |
Generation And Distribution Services | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage | 9.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of earned return | 9.04% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage | 9.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
North Carolina Regulation | Public Service Company Of North Carolina |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Application date |  |  |  | 2023-03 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
North Carolina Regulation | Public Service Company Of North Carolina | Rider D |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase(Decrease) in gas cost |  |  |  |  | $ (56) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approval date |  |  |  |  | 2023-03 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
North Carolina Regulation | Public Service Company Of North Carolina | Rider DSM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in customer usage tracker |  |  |  | $ 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ohio Regulation | PIR Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Application date |  |  |  |  |  |  |  |  |  |  |  |  |  | 2023-02 |  |  |  |  |  |
Percentage of pipeline system replaced |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00%
Increases of annual capital expenditures percentage |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total gross plant investment estimated cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 225 |  |  |
Proposed revenue requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 305 |  |  |
Cumulative gross plant investment estimated cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,400 |  |  |
Ohio Regulation | CEP Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Application date |  |  |  |  |  |  |  |  |  |  |  |  |  | 2023-03 |  |  |  |  |  |
Total gross plant investment estimated cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 195 |  |  |
Proposed revenue requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300 |  |  |
Cumulative gross plant investment estimated cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 151 |  |  |
Percentage of debt rate on capital investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.50% |
Ohio Regulation | UEX Rider |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public utilities, under-recovered accumulated bad debt expense |  |  |  |  |  |  |  |  |  |  |  | $ 9 |  |  |  |  |  |  |  |
Actual revenue requirement |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23 |  |  |  |  |  |
Ohio Regulation | UEX Rider | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recovery of bad debt expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14 |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  | 38 |  | $ 409 | 45 | $ 413 |  |  |  |  |
Regulatory liabilities |  |  |  |  |  |  |  |  |  |  | 231 |  |  | 231 |  |  | $ 506 | [2] |  |
Virginia Electric and Power Company | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized but unissued shares of common stock | shares | 3,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Annual Fuel Factor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  | $ (13) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Annual Fuel Factor | Impairment of Assets and Other Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  | 191 |  |  |  |  |  |  |
Virginia Electric and Power Company | Rider RGGI | Impairment of Assets and Other Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  |  |  |  |  |  |  |  |  | 180 |  |  |  |  |  |  |
Virginia Electric and Power Company | Utility Scale Solar |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed cost of project |  |  |  |  |  |  | $ 1,200 |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted capacity provided by legislation | MW |  |  |  |  |  |  | 474 |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Energy Storage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted capacity provided by legislation | MW |  |  |  |  |  |  | 16 |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Electric Distribution Grid Transformation Projects |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed cost of project |  |  |  |  |  |  |  |  |  |  | $ 1,100 |  |  | 1,100 |  |  |  |  |  |
Proposed operations and maintenance investment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 71 |  |  |  |  |  |
Number of electric distribution grid transformation projects | Project |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |  |
Number of electric distribution grid transformation projects components | Components |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate year beginning |  | 2023-07 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage |  |  | 9.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage credited to customers bills |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalization ratio |  |  | 52.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated under-recovered balances |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300 |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage | 9.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalization ratio | 52.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Base Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue requirement |  | $ 351 | $ 350 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Base Rate Case | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue requirement | $ 350 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Annual Fuel Factor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue requirement |  | $ 2,300 |  |  |  |  |  |  | $ 2,300 |  |  |  |  |  |  |  |  |  |  |
Rate year beginning |  | 2023-07 |  |  |  |  |  |  | 2022-07 |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  | $ 631 |  |  |  |  |  |  |  |  |  |  |  | $ (541) |  |  |  |  |  |
Fuel cost requirement |  | 3,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges after tax |  |  |  |  |  |  |  |  |  |  |  |  | 142 |  |  |  |  |  |  |
Estimated under-recovered balances |  | $ 1,300 |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  | $ 578 |  |  |  |  |
Public utilities collection of requested under-recovered projected fuel expense period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Rider RGGI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges after tax |  |  |  |  |  |  |  |  |  |  |  |  | $ 134 |  |  |  |  |  |  |
Virginia Electric and Power Company | Biennial Review |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage | 0.70% |  | 9.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credited to customers bills percentage |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage credited to customers bills |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Triennial Review |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage |  |  | 0.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credited to customers bills percentage |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | South Carolina Regulation | Electric Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  |  | $ 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | South Carolina Regulation | Rider DSM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approval request to recover costs and net lost revenues amount |  |  |  |  |  | $ 46 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | South Carolina Regulation | Cost Of Fuel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in annual base fuel component recoveries |  |  | $ 176 | $ 121 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | South Carolina Regulation | Electric Transmission Project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Application date |  |  |  | 2023-03 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Type of Line | kV |  |  |  | 230 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Miles of Lines | mi |  |  |  | 19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost Estimate |  |  |  | $ 55 |  |  |  |  |  |  |  | $ 55 |  |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | South Carolina Regulation | Natural Gas Base Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  |  | $ 19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of proposed earned return |  |  |  | 10.38% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage |  |  |  |  |  |  |  |  |  | 10.25% |  |  |  |  |  |  |  |  |  |
Questar Gas Company | Utah Regulation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase(Decrease) in gas cost |  |  |  | $ 92 | $ 164 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approval date |  |  |  |  | 2023-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date.

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