Regulatory Matters (Narrative) (Detail 4)	1 Months Ended
	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