Regulatory Matters - Summary of Virginia Power Electric Transmission Project Applied (Detail) - Virginia Electric and Power Company $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) mi kV
Construct new Aspen and Golden substations, transmission lines and related projects in Loudoun County, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2024-03
Type of Line	500-230 kV
Miles of Lines | mi	10
Cost Estimate | $	$ 690	[1]
Partial rebuild Fredericksburg-Aquia Harbour transmission lines and related projects in Stafford County and the City of Fredericksburg, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2024-03
Type of Line	230-115 kV
Miles of Lines | mi	24
Cost Estimate | $	$ 135	[1]
Construct new Apollo-Twin Creek transmission lines, new substations and related projects in Loudoun County, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2024-03
Type of Line | kV	230
Miles of Lines | mi	2
Cost Estimate | $	$ 285	[1]
Rebuild Dooms-Harrisonburg transmission lines and related projects in the Counties of Augusta and Rockingham and the Town of Grottoes, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2024-04
Type of Line | kV	230
Miles of Lines | mi	22
Cost Estimate | $	$ 60

[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 approved or applied for and currently pending approval with aggregate cost estimates of approximately $45 million and $100 million, respectively.