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Regulatory Matters - Summary of Virginia Power Electric Transmission Project Applied (Detail) - Virginia Electric and Power Company $ in Millions | 9 Months Ended
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Sep. 30, 2020 USD ($) kV mi
Rebuild and operate five segments between the Loudoun and Ox substations |
Public Utilities General Disclosures [Line Items] |
Application Date | 2019-08
Approval Date | 2020-06
Capacity of transmission line (kV) | kV | 230
Length of kV line (miles | mi | 19
The total estimated capital investment | $ | $ 70
Build new Lockridge substation and line loop in Loudoun County, Virginia |
Public Utilities General Disclosures [Line Items] |
Application Date | 2019-12
Approval Date | 2020-10
Capacity of transmission line (kV) | kV | 230
The total estimated capital investment | $ | $ 35
Rebuild and operate two lines in Chesterfield County, Virginia |
Public Utilities General Disclosures [Line Items] |
Application Date | 2020-01
Approval Date | 2020-06
Capacity of transmission line (kV) | kV | 230
Length of kV line (miles | mi | 3
The total estimated capital investment | $ | $ 15
Bristers-Ladysmith Rebuild Project in the counties of Fauquier, Stafford, Spotsylvania, and Caroline, Virginia |
Public Utilities General Disclosures [Line Items] |
Application Date | 2020-05
Approval Date | Pending
Capacity of transmission line (kV) | kV | 500
Length of kV line (miles | mi | 37
The total estimated capital investment | $ | $ 110
Relocate and replace a transmission line underground between the Tysons substation and the future Spring Hill substation |
Public Utilities General Disclosures [Line Items] |
Application Date | 2020-09
Approval Date | Pending
Capacity of transmission line (kV) | kV | 230
The total estimated capital investment | $ | $ 30
Rebuild and Install New Line in Counties of New Kent, King William, King and Queen Essex and Richmond, Virginia |
Public Utilities General Disclosures [Line Items] |
Application Date | 2020-10
Approval Date | Pending
Capacity of transmission line (kV) | kV | 230
Length of kV line (miles | mi | 41
The total estimated capital investment | $ | $ 100

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