Regulatory Matters - Summary of Virginia Electric Transmission Projects (Detail) - Elmont-Ladysmith rebuild and related projects in the Counties of Hanover and Caroline, Virginia - Virginia Electric and Power Company $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) kV mi
Public Utilities General Disclosures [Line Items]
Application Date	2021-04
Approval Date	Pending
Type of Line | kV	500
Miles of Lines | mi	26
Cost Estimate | $	$ 95