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Regulatory Matters (Narrative) (Detail) shares in Millions, $ in Millions |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 08, 2023 USD ($) | Oct. 31, 2023 USD ($) MW | Sep. 30, 2023 USD ($) | Jul. 31, 2023 USD ($) shares | May 31, 2023 USD ($) | Apr. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) Project Components mi kV | Feb. 28, 2023 USD ($) | Jan. 31, 2023 USD ($) | Oct. 31, 2022 USD ($) MW | Jun. 30, 2022 USD ($) | May 31, 2022 USD ($) | Mar. 31, 2022 | Nov. 30, 2023 shares | Sep. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) Battery | Sep. 30, 2022 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2011 | Dec. 31, 2008
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 663 |  | $ 630 |  |  |  | $ 1,884 | $ 1,832 |  |  |  |  |
Regulatory liabilities |  |  | $ 434 |  |  |  |  |  |  |  |  |  |  |  | 434 |  |  |  |  |  | $ 434 |  |  | $ 748 | [1] |  |
Base Rate Case | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of proposed earned return |  | 10.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Generation And Distribution Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage |  |  |  | 9.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Regulation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of earned return |  |  |  | 9.04% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage |  |  |  | 9.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
North Carolina Regulation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Application date |  |  |  |  |  |  | 2023-03 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
North Carolina Regulation | Rider D |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase(Decrease) in gas cost |  |  |  |  |  |  |  | $ (56) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approval date |  |  |  |  |  |  |  | 2023-03 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
North Carolina Regulation | Rider DSM |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in customer usage tracker |  |  | 34 |  |  |  | $ 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ohio Regulation | PIR Program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Application date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2023-04 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2023-09 |  |  |  |  |  |
Total gross plant investment estimated cost |  |  | 195 |  |  |  |  |  |  |  |  |  |  |  | 195 |  |  |  |  |  | $ 195 |  |  |  |  |  |
Proposed revenue requirement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,300 |  |  |  |  |  |
Cumulative gross plant investment estimated cost |  |  | 151 |  |  |  |  |  |  |  |  |  |  |  | 151 |  |  |  |  |  | 151 |  |  |  |  |  |
Percentage of debt rate on capital investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.50% |
Ohio Regulation | Base Rate Case | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in non-fuel base rate |  | $ 212 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage |  | 10.38% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized but unissued shares of common stock | shares |  |  |  | 3,250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 488 |  | 451 |  |  |  | 1,367 | $ 1,305 |  |  |  |  |
Regulatory liabilities |  |  | 226 |  |  |  |  |  |  |  |  |  |  |  | 226 |  |  |  |  |  | 226 |  |  | $ 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 | Income Payment Program | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Universal service fee |  | $ 71 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | Utility Scale Solar | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proposed cost of project |  | $ 850 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Targeted capacity provided by legislation | MW |  | 329 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  | 773 |  |  |  | 1,100 |  |  |  |  |  |  |  | 773 | 1,100 |  |  |  |  | $ 773 |  |  |  |  |  |
Proposed operations and maintenance investment |  |  | 71 |  |  |  | $ 71 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of electric distribution grid transformation projects | Project |  |  |  |  |  |  | 14 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of electric distribution grid transformation projects components | Components |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of battery energy storage system | Battery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |
Proposed capital cost of energy storage system |  |  | 50 |  |  |  |  |  |  |  |  |  |  |  | $ 50 |  |  |  |  |  | $ 50 |  |  |  |  |  |
Batteries to be installed over number of years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate year beginning |  |  |  |  | 2023-07 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage |  |  |  | 9.70% |  | 9.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage credited to customers bills |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalization ratio |  |  |  | 52.10% |  | 52.10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated under-recovered balances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300 |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalization ratio |  |  |  |  |  |  |  |  |  |  |  |  |  | 52.10% |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated under-recovered balances | $ 1,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Base Rate Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue requirement |  |  |  | $ 350 | $ 351 | $ 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 |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33 |  |  |  |  |  |  |  |  |  |
Depreciation and amortization after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |
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 |  |  | $ 9 |  |  |  | $ 19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of proposed earned return |  |  |  |  |  |  | 10.38% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage |  |  | 9.49% |  |  |  |  |  |  |  |  |  | 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 and recast for certain events as discussed in Note 1.
[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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