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Regulatory Matters - Summary of Virginia Power Electric Transmission Project Applied (Detail) - Virginia Electric and Power Company
mi in Millions, kV in Millions, $ in Millions
6 Months Ended
Jun. 30, 2023
USD ($)
mi
kV
Partial rebuild of Bristers-Ox 115 kV line in Fauquier and Prince William Counties, Virginia  
Public Utilities General Disclosures [Line Items]  
Application Date 2022-08
Approval Date 2023-04
Type of Line | kV 230
Miles of Lines | mi 15
Cost Estimate | $ $ 40
Construct new switching station, substations, transmission lines and related projects in Lunenberg and Mecklenburg Counties Virginia  
Public Utilities General Disclosures [Line Items]  
Application Date 2022-10
Approval Date 2023-06
Type of Line | kV 230
Miles of Lines | mi 18
Cost Estimate | $ $ 230
Construct New Switching Station, Substation, Transmission Lines And Related Projects In Charlotte, Halifax And Mecklenburg Counties, Virginia  
Public Utilities General Disclosures [Line Items]  
Application Date 2022-10
Approval Date 2023-05
Type of Line | kV 230
Miles of Lines | mi 26
Cost Estimate | $ $ 215
Construct new Mars and Wishing Star substations, transmission lines and related projects in Loudoun County, Virginia  
Public Utilities General Disclosures [Line Items]  
Application Date 2022-10
Approval Date 2023-04
Type of Line 500/230 kV
Miles of Lines | mi 4
Cost Estimate | $ $ 720
Construct New Altair Switching Station Transmission Lines And Related Projects In Loudoun County Virginia  
Public Utilities General Disclosures [Line Items]  
Application Date 2022-11
Approval Date 2023-06
Type of Line 230
Miles of Lines | mi 2
Cost Estimate | $ $ 50
Rebuild of Lines #2019 and #2007 in the City of Virginia Beach, Virginia  
Public Utilities General Disclosures [Line Items]  
Application Date 2023-02
Type of Line | kV 230
Miles of Lines | mi 5
Cost Estimate | $ $ 95
Install transformer at Possum Point substation, rebuild and construct transmission lines and related projects in Prince William County, Virginia  
Public Utilities General Disclosures [Line Items]  
Application Date 2023-03
Type of Line | kV 230
Miles of Lines | mi 2
Cost Estimate | $ $ 35
Partial rebuild of Line #2011 in the Cities of Manassas and Manassas Park, Virginia and Prince William and Fairfax Counties, Virginia  
Public Utilities General Disclosures [Line Items]  
Application Date 2023-03
Type of Line | kV 230
Miles of Lines | mi 7
Cost Estimate | $ $ 35
Construct new transmission lines and convert jeffress switching station in mecklenburg county virginia  
Public Utilities General Disclosures [Line Items]  
Application Date 2023-05
Type of Line | kV 230
Miles of Lines | mi 18
Cost Estimate | $ $ 135
Construct new transmission lines and expand white oak substation in henrico county virginia  
Public Utilities General Disclosures [Line Items]  
Application Date 2023-06
Type of Line | kV 230
Miles of Lines | mi 5
Cost Estimate | $ $ 45