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Regulatory Matters - Summary of Virginia Power Electric Transmission Project Applied (Detail) - Virginia Electric and Power Company $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) mi kV
Construct new Germanna substation, transmission line and related projects in Culpeper County, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2023-11
Approval Date	2024-08
Type of Line	230 kV
Miles of Lines | mi	2
Cost Estimate | $	$ 55	[1]
Construct Daves Store transmission line extension in Prince William County, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2024-02
Approval Date	2024-10
Type of Line	230 kV
Miles of Lines | mi	3
Cost Estimate | $	$ 70	[1]
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
Approval Date	2025-02
Type of Line	500-230 kV
Miles of Lines | mi	10
Cost Estimate | $	$ 705	[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
Approval Date	2025-02
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
Approval Date	2025-02
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
Approval Date	2025-02
Type of Line | kV	230
Miles of Lines | mi	22
Cost Estimate | $	$ 60	[1]
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
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
Type of Line | kV	230
Miles of Lines | mi	6
Cost Estimate | $	$ 170	[1]
Rebuild Aquia Harbor-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
Type of Line	500-230 kV
Miles of Lines | mi	32
Cost Estimate | $	$ 210	[1]
Partial rebuild, reconductor and construct new New Post transmission lines and related projects in the Counties of Caroline and Spotsylvania, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2024-08
Type of Line | kV	230
Miles of Lines | mi	38
Cost Estimate | $	$ 120	[1]
Construct new Centreport transmission line, substation and related projects in Stafford County, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2024-09
Type of Line | kV	230
Miles of Lines | mi	3
Cost Estimate | $	$ 55	[1]
Partial rebuild and construct new Meadowville transmission lines, substations and related projects in Chesterfield County, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2024-10
Type of Line | kV	230
Miles of Lines | mi	11
Cost Estimate | $	$ 190	[1]
Construct new Carmel Church and Ruther Glen transmission lines, substations and related projects in Caroline County, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2024-12
Type of Line | kV	230
Miles of Lines | mi	7
Cost Estimate | $	$ 85	[1]
Construct new Nebula transmission lines, substation and related projects in Mecklenburg County, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2025-01
Type of Line | kV	230
Miles of Lines | mi	15
Cost Estimate | $	$ 130	[1]
Construct new Culpeper Technology transmission lines, substations and related projects in the Counties of Culpeper, Orange and Fauquier and the Town of Culpeper, Virginia
Public Utilities General Disclosures [Line Items]
Application Date	2025-02
Type of Line | kV	230
Miles of Lines | mi	13
Cost Estimate | $	$ 255	[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 approved during 2024 and early 2025 or applied for and currently pending approval with aggregate cost estimates of approximately $145 million and $65 million, respectively.

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