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Regulatory Matters (Narrative) (Detail) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 USD ($) | May 31, 2024 USD ($) | Mar. 31, 2024 USD ($) mi kV | Feb. 29, 2024 USD ($) | Jan. 31, 2024 USD ($) | Nov. 30, 2023 USD ($) | Oct. 31, 2023 USD ($) Project MW | Jul. 31, 2023 USD ($) | May 31, 2023 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($)
Virginia Regulation |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of earned return |  |  |  |  |  |  |  | 9.04% |  |  |
Authorized return percentage |  |  |  | 9.35% |  |  |  | 9.35% |  |  |
Virginia Regulation | Annual Fuel Factor | Securitization Option |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  | $ 541 |  |  |  |  |  |  |  |
North Carolina Regulation |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Application date |  |  | 2024-03 |  |  |  |  |  |  |  |
North Carolina Regulation | Rider DSM |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in customer usage tracker |  |  | $ 31 |  |  |  |  |  |  |  |
North Carolina Regulation | Virginia Power Base Rate Case |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase(Decrease) in gas cost |  |  | $ 57 |  |  |  |  |  |  |  |
Percentage of earned return |  |  | 5.01% |  |  |  |  |  |  |  |
Percentage of proposed earned return |  |  | 10.60% |  |  |  |  |  |  |  |
Authorized return percentage |  |  | 9.75% |  |  |  |  |  |  |  |
South Carolina Regulation | Electric Base Rate Case |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of earned return |  |  | 4.32% |  |  |  |  |  |  |  |
Percentage of proposed earned return |  |  | 10.60% |  |  |  |  |  |  |  |
Authorized return percentage |  |  | 9.50% |  |  |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated under-recovered balances |  |  |  | $ 1,300 |  |  |  |  |  |  |
Virginia Electric and Power Company | Impairment of Assets and Other Charges |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges (benefits) |  |  |  |  |  |  |  |  |  |  | $ (17)
Impairment of assets and other charges (benefits) after tax |  |  |  |  |  |  |  |  |  |  | (12)
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 | Utility Scale Solar |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proposed cost of project |  |  |  |  |  |  | $ 850 |  |  |  |
Number of utility-scale projects | Project |  |  |  |  |  |  | 4 |  |  |  |
Targeted capacity provided by legislation | MW |  |  |  |  |  |  | 329 |  |  |  |
Virginia Electric and Power Company | Virginia Regulation |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Public utilities event costs to be recovered |  |  |  |  |  | $ 45 |  |  |  |  |
Authorized return percentage |  |  |  | 9.70% |  |  |  | 9.70% |  |  |
Capitalization ratio |  |  |  |  |  |  |  | 52.10% |  |  |
Virginia Electric and Power Company | Virginia Regulation | Forecast |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
One-time credits to customers | $ 15 |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Base Rate Case |  |  |  |  |  |  |  |  |  |  |
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 |  |
Rate year beginning |  |  |  |  |  |  |  |  | 2023-07 |  |
Estimated under-recovered balances |  |  |  |  |  |  |  |  | $ 1,300 |  |
Virginia Electric and Power Company | Virginia Regulation | Annual Fuel Factor | Forecast |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenue requirement |  | $ 2,200 |  |  |  |  |  |  |  |  |
Rate year beginning |  | 2024-07 |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  | $ 636 |  |  |  |  |  |  |  |  |
Estimated over-recovered balances |  |  |  |  |  |  |  |  |  | $ 266 |
Virginia Electric and Power Company | Virginia Regulation | Annual Fuel Factor | Securitization Option |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated under-recovered balances |  |  |  |  |  |  |  |  | $ 1,300 |  |
Virginia Electric and Power Company | Virginia Regulation | Generation And Distribution Services |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage |  |  |  |  |  | 9.05% |  |  |  |  |
Virginia Electric and Power Company | Biennial Review |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Authorized return percentage |  |  |  | 0.70% |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | South Carolina Regulation | Electric DSM Programs |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Public energy efficiency programs cost rate adjustment approval request to recover amount |  |  |  |  | $ 47 |  |  |  |  |  |
Dominion Energy South Carolina Inc | South Carolina Regulation | Cost of Fuel |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Rate year beginning |  |  |  | 2024-05 |  |  |  |  |  |  |
Application date |  |  |  | 2024-02 |  |  |  |  |  |  |
Proposed increase (decrease) in annual base fuel component recoveries |  |  |  |  |  |  |  |  |  |  | (315)
Increase (decrease) in annual base fuel component recoveries |  |  | $ (316) |  |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | South Carolina Regulation | Electric Base Rate Case |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  |  | 295 |  |  |  |  |  |  |  |
Increase (decrease) in net of strom damage |  |  | $ (4) |  |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | South Carolina Regulation | Electric Base Rate Case | Forecast |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement | $ 291 |  |  |  |  |  |  |  |  |  |
Increase in proposed base rate percentage | 12.59% |  |  |  |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | South Carolina Regulation | Electric Transmission Project |  |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |
Application date |  |  | 2024-03 |  |  |  |  |  |  |  |
Type of Line | kV |  |  | 230 |  |  |  |  |  |  |  |
Miles of Lines | mi |  |  | 7 |  |  |  |  |  |  |  |
Cost Estimate |  |  | $ 40 |  |  |  |  |  |  |  | $ 40

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