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Regulatory Matters - Summary of Virginia Power Electric Transmission Project Applied (Detail) - Virginia Electric and Power Company $ in Millions	6 Months Ended
	Jun. 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
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

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