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Regulatory Matters (Narrative) (Detail 4) | 1 Months Ended
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Oct. 31, 2024 MW | May 31, 2024 USD ($) | Oct. 31, 2023 MW | May 31, 2023 USD ($) | May 31, 2022 USD ($) | Apr. 30, 2020 MW
Target to Reach by End of 2025 |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Energy efficiency target percentage. based on energy savings from 2019 baseline |  |  |  |  |  | 5.00%
Virginia Electric and Power Company | Annual Fuel Factor |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Increase (decrease) in revenue requirement | $ |  |  |  | $ 13,000,000 |  |
Virginia Electric and Power Company | Utility-scale Solar |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Targeted capacity provided by legislation | 208 |  | 329 |  |  |
Virginia Electric and Power Company | Virginia Regulation | Annual Fuel Factor |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Increase (decrease) in revenue requirement | $ |  | $ 636,000,000 |  |  | $ 1,800,000,000 |
Virginia Electric and Power Company | Virginia Regulation | Maximum | Annual Fuel Factor |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Increase (decrease) in revenue requirement | $ |  |  |  |  | 1,300,000,000 |
Virginia Electric and Power Company | Virginia Regulation | Minimum | Annual Fuel Factor |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Increase (decrease) in revenue requirement | $ |  |  |  |  | $ 1,200,000,000 |
Virginia Electric and Power Company | Virginia Regulation | Offshore Wind Facility | End of Year 2035 | Maximum |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Constructed by utility capacity |  |  |  |  |  | 3,000
Virginia Electric and Power Company | Virginia Regulation | Offshore Wind Facility | End of Year 2035 | Minimum |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Constructed by utility capacity |  |  |  |  |  | 2,500
Virginia Electric and Power Company | Virginia Regulation | Offshore Wind Facility | Before 2035 | Maximum |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Targeted capacity provided by legislation |  |  |  |  |  | 5,200
Virginia Electric and Power Company | Virginia Regulation | Utility-scale Solar |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Targeted capacity provided by legislation |  |  |  |  |  | 3,000
Virginia Electric and Power Company | Virginia Regulation | Utility-scale Solar | End of Year 2035 | Maximum |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Targeted capacity provided by legislation |  |  |  |  |  | 15,000
Virginia Electric and Power Company | Virginia Regulation | Pumped Storage | End of Year 2035 | Maximum |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Targeted capacity provided by legislation |  |  |  |  |  | 800

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