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Regulatory Matters - Summary of Virginia Power Electric Transmission Project Applied (Detail) - Virginia Electric and Power Company - Virginia Regulation $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 kV | Dec. 31, 2018 USD ($) mi kV | Jan. 31, 2019 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |
Capacity of transmission line (kV) |  | 115 |
Transmission Lines Between Possum Point Switching Station And Novec's Smoketown Delivery Point [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Application Date |  | 2017-06 |
Approval Date |  | 2018-02 |
Capacity of transmission line (kV) |  | 230 |
Length of kV line (miles) | mi |  | 9 |
The total estimated capital investment | $ |  | $ 20 |
Transmission Line Between Dooms Substation And Valley Substation [Member] |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Application Date |  | 2017-09 |
Approval Date |  | 2018-09 |
Capacity of transmission line (kV) |  | 500 |
Length of kV line (miles) | mi |  | 18 |
The total estimated capital investment | $ |  | $ 65 |
Transmission Line Between Idylwood and Tysons Substations |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Application Date |  | 2017-11 |
Approval Date |  | 2018-09 |
Capacity of transmission line (kV) | 230 | 230 |
Length of kV line (miles) | mi |  | 4 |
The total estimated capital investment | $ |  | $ 125 | $ 68
Transmission Lines Between Chesterfield and Hopewell Substations |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Application Date |  | 2018-05 |
Approval Date |  | 2018-11 |
Capacity of transmission line (kV) |  | 230 |
Length of kV line (miles) | mi |  | 8 |
The total estimated capital investment | $ |  | $ 30 |
Transmission Lines Between Chesterfield and Lakeside Substations |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Application Date |  | 2018-05 |
Approval Date |  | 2018-12 |
Capacity of transmission line (kV) |  | 230 |
Length of kV line (miles) | mi |  | 21 |
The total estimated capital investment | $ |  | $ 35 |
Transmission Lines Between Landstown and Thrasher Substations |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Application Date |  | 2018-06 |
Approval Date |  | 2018-12 |
Capacity of transmission line (kV) |  | 230 |
Length of kV line (miles) | mi |  | 8.5 |
The total estimated capital investment | $ |  | $ 20 |
Transmission Line In Alleghany Country Virginia And Covington Virginia |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Application Date |  | 2018-08 |
Capacity of transmission line (kV) |  | 138 |
Length of kV line (miles) | mi |  | 5 |
The total estimated capital investment | $ |  | $ 15 |
Build a new substation and connect three existing transmission lines thereto in Fluvanna County, Virginia |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Application Date |  | 2018-10 |
Capacity of transmission line (kV) |  | 230 |
The total estimated capital investment | $ |  | $ 30 |
Maximum | Build a new substation and connect three existing transmission lines thereto in Fluvanna County, Virginia |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Length of kV line (miles) | mi |  | 1 |

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