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Regulatory Matters - Summary of Virginia Power Electric Transmission Project Applied (Detail) - Virginia Electric and Power Company
$ in Millions
 1 Months Ended 9 Months Ended
Oct. 31, 2025
USD ($)
mi
Sep. 30, 2025
USD ($)
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
Approval Date [1]   2025-02
Type of Line   500-230 kV
Miles of Lines | mi   10
Cost Estimate | $ [2]   $ 705
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 [1]   2025-02
Type of Line | kV   230
Miles of Lines | mi   2
Cost Estimate | $ [2]   $ 285
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 | $ [2]   $ 205
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 | $ [2]   $ 170
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 | $ [2]   $ 210
Partial Rebuild, Reconductor and Construct New New Post Transmission Lines and Related Projects in the Countries of Caroline and Spotsylvania, Virginia [Member]    
Public Utilities General Disclosures [Line Items]    
Application Date   2024-08
Approval Date   2025-05
Type of Line   230 kV
Miles of Lines | mi   38
Cost Estimate | $ [2]   $ 120
Construct new Centreport transmission line, substation and related projects in Stafford County, Virginia    
Public Utilities General Disclosures [Line Items]    
Application Date   2024-09
Approval Date   2025-06
Type of Line   230 kV
Miles of Lines | mi   3
Cost Estimate | $ [2]   $ 55
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
Approval Date   2025-06
Type of Line   230 kV
Miles of Lines | mi   11
Cost Estimate | $ [2]   $ 190
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
Approval Date   2025-09
Type of Line   230
Miles of Lines | mi   7
Cost Estimate | $ [2]   $ 85
Construct New Nebula Transmission Lines, Substation and Related Projects in Mecklenburg County, Virginia    
Public Utilities General Disclosures [Line Items]    
Application Date   2025-01
Approval Date   2025-10
Type of Line   230
Miles of Lines | mi   15
Cost Estimate | $ [2]   $ 130
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   230 kV
Miles of Lines | mi   5
Cost Estimate | $ [2]   $ 60
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 | $ [2]   $ 95
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 | $ [2]   $ 525
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 | $ [2]   $ 125
Rebuild Chickahominy-Elmont Transmission Line, New Future Transmission Line and Related Projects in the Countries of Charles City, Henrico and Hanover, Virginia    
Public Utilities General Disclosures [Line Items]    
Application Date   2025-05
Type of Line   500-230 kV
Miles of Lines | mi   28
Cost Estimate | $ [2]   $ 190
Rebuild Septa-Yadkin transmission line, partial rebuild of Suffolk-Thrasher transmission line and related projects in Isle of Wight County and the Cities of Chesapeake and Suffolk, Virginia    
Public Utilities General Disclosures [Line Items]    
Application Date   2025-06
Type of Line   500-230 kV
Miles of Lines | mi   33
Cost Estimate | $ [2]   $ 250
Partial rebuild Chesterfield-Lanexa transmission lines in the Counties of Henrico, Charles City and New Kent, Virginia    
Public Utilities General Disclosures [Line Items]    
Application Date   2025-09
Type of Line   230-115 kV
Miles of Lines | mi   58
Cost Estimate | $ [2]   $ 150
Rebuild Charlottesville-Dooms transmission lines in the Counties of Albemarle and Augusta and the City of Charlottesville, Virginia | Subsequent Event    
Public Utilities General Disclosures [Line Items]    
Application Date 2025-10  
Type of Line 230 kV  
Miles of Lines | mi 22  
Cost Estimate | $ [2] $ 125  
[1] The final order of the Virginia Commission has been appealed to the Supreme Court of Virginia. This matter is pending.
[2] 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 2025 with aggregate cost estimates of approximately $65 million.