Regulatory Matters - Summary of Virginia Power Electric Transmission Project Applied (Detail) - Virginia Electric and Power Company $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($) mi kV
Rebuild and construct new Fentress-Yadkin transmission lines and related projects in the City of Chesapeake, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2024-06
Approval Date	2025-02
Type of Line | kV	500
Miles of Lines | mi	14
Cost Estimate | $	$ 205	[1]
Partial rebuild, reconductor and construct new Network Takeoff transmission lines and related projects in the Counties of Fairfax and Loudoun, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2024-07
Approval Date	2025-03
Type of Line | kV	230
Miles of Lines | mi	6
Cost Estimate | $	$ 170	[1]
Rebuild Aquia Harbour-Possum Point transmission lines and related projects in the Counties of Stafford and Prince William and the City of Fredericksburg, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2024-08
Approval Date	2025-03
Type of Line	500-230 kV
Miles of Lines | mi	32
Cost Estimate | $	$ 210	[1]
Construct new Technology Boulevard transmission lines, substation and related projects in Henrico County, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2025-03
Type of Line | kV	230
Miles of Lines | mi	5
Cost Estimate | $	$ 60	[1]
Construct new Hornbaker transmission lines, switching station and related projects in Prince William County, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2025-03
Type of Line | kV	230
Miles of Lines | mi	5
Cost Estimate | $	$ 95	[1]
Construct new Golden-Mars transmission lines and related projects in Loudoun County, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2025-03
Type of Line	500-230 kV
Miles of Lines | mi	11
Cost Estimate | $	$ 525	[1]
Construct new Duval-Midlothian transmission lines, substation and related projects in Chesterfield County, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2025-04
Type of Line	230 kV
Miles of Lines | mi	7
Cost Estimate | $	$ 125	[1]

[1] Represents the cost estimate included in the application except as updated in the approval if applicable. In addition, Virginia Power had various other transmission projects applied for and currently pending approval with aggregate cost estimates of approximately $65 million.