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Regulatory Matters - Summary of Additional Significant Virginia Power Electric Transmission Projects Approved and Applied (Detail) - Virginia Electric and Power Company - Virginia Regulation $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) kV | Dec. 31, 2018 USD ($) kV mi
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 |  | 9.0
Total estimated cost of project | $ |  | $ 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 |  | 18.0
Total estimated cost of project | $ |  | $ 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 |  | 4.0
Total estimated cost of project | $ | $ 30 | $ 125
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 |  | 8.0
Total estimated cost of project | $ |  | $ 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 |  | 21.0
Total estimated cost of project | $ |  | $ 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
Total estimated cost of project | $ |  | $ 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 |  | 5.0
Total estimated cost of project | $ |  | $ 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
Total estimated cost of project | $ |  | $ 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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