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Regulatory Matters (Narrative) (Detail) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2025 USD ($) | Mar. 31, 2025 USD ($) MW | Feb. 28, 2025 | Jan. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) mi kV | Oct. 31, 2024 USD ($) MW | Apr. 30, 2020 | Mar. 31, 2024 USD ($) | Jun. 30, 2025 USD ($) | Apr. 30, 2025 USD ($) $ / shares
Targeted To Reach By End Of Year Five [Member] |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Energy efficiency target percentage. based on energy savings from 2019 baseline |  |  |  |  |  |  | 5.00% |  |  |
Virginia Regulation | 2025 Biennial Review |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Approved base rate increase effective January 2026 |  |  |  |  |  |  |  |  | $ 458,000,000 |
Approved base rate increase effective January 2027 |  |  |  |  |  |  |  |  | $ 173,000,000 |
Percentage of earned return |  |  |  |  |  |  |  |  | 7.77% |
Authorized return percentage |  |  |  |  |  |  |  |  | 9.70% |
Base rate increase effective January 2026 |  |  |  |  |  |  |  |  | $ 822,000,000 |
Base rate increase effective January 2027 |  |  |  |  |  |  |  |  | $ 345,000,000 |
Proposed base rates reflect an ROE |  |  |  |  |  |  |  |  | 52.10% |
Common equity capitalization to total capitalization ratio |  |  |  |  |  |  |  |  | 10.40% |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock shares authorized but unissued shares |  |  |  |  |  |  |  |  |  | $ 3,500,000,000
Common stock par value | $ / shares |  |  |  |  |  |  |  |  |  | $ 0
Percentage of energy savings target for 2026 |  |  | 3.00% |  |  |  |  |  |  |
Percentage of energy savings target for 2027 |  |  | 4.00% |  |  |  |  |  |  |
Percentage of energy savings target for 2028 |  |  | 5.00% |  |  |  |  |  |  |
Virginia Electric and Power Company | Impairment of Assets and Other Charges |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of assets and other charges (benefits) |  |  |  |  |  |  |  | $ (17,000,000) |  |
Impairment of assets and other charges (benefits) after tax |  |  |  |  |  |  |  | $ (12,000,000) |  |
Virginia Electric and Power Company | Utility Scale Solar |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Proposed cost of project |  |  |  |  |  | $ 605,000,000 |  |  |  |
Targeted capacity provided by legislation | MW |  |  |  |  |  | 208 |  |  |  |
Virginia Electric and Power Company | GTSA Filing |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Proposed capital investment |  | $ 278,000,000 |  |  |  |  |  |  |  |
Proposed operations and maintenance investment |  | 5,000,000 |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Chesterfield Energy Reliability Center |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Proposed cost of project |  | $ 1,500,000,000 |  |  |  |  |  |  |  |
Targeted capacity provided by legislation | MW |  | 944 |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Virginia Regulation | Annual Fuel Factor |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Total revenue requirement |  | $ 2,600,000,000 |  |  |  |  |  |  |  |
Rate year beginning |  | 2024-07 |  |  |  |  |  |  |  |
Increase (decrease) in revenue requirement |  | $ 860,000,000 |  |  |  |  |  |  |  |
Estimated under-recovered balances |  | 205,000,000 |  |  |  |  |  |  |  |
Purchased capacity expense |  | $ 120,000,000 |  |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | Natural Gas Rates |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Total revenue requirement | $ 596,000,000 |  |  |  |  |  |  |  |  |
Base rate increase effective January 2026 | $ 17,000,000 |  |  |  |  |  |  |  |  |
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 |  |  |  | $ 46,000,000 |  |  |  |  |  |
Dominion Energy South Carolina Inc | South Carolina Regulation | Cost of Fuel |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Rate year beginning |  |  | 2025-05 |  |  |  |  |  |  |
Application date |  |  | 2025-02 |  |  |  |  |  |  |
Proposed increase (decrease) in annual base fuel component recoveries |  |  |  |  |  |  |  |  | $ 154,000,000 |
Dominion Energy South Carolina Inc | South Carolina Regulation | Electric Transmission Projects |  |  |  |  |  |  |  |  |  |
Public Utilities General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Application date |  |  |  |  | 2024-12 |  |  |  |  |
Type of Line | kV |  |  |  |  | 230 |  |  |  |  |
Miles of Lines | mi |  |  |  |  | 17 |  |  |  |  |
Cost Estimate |  |  |  |  | $ 55,000,000 |  |  |  |  |

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