Regulatory Matters - Schedule of Additional Significant Riders Associated with Virginia Power Projects (Parenthetical) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($) Agreement Project
Virginia Electric and Power Company
Public Utilities, General Disclosures [Line Items]
Additional total revenue requirement	$ 25
Public utilities requested rate increase annual revenue of pending applications approval	$ 53
Rider CE
Public Utilities, General Disclosures [Line Items]
Public utilities number of small scale solar project | Agreement	2
Public utilities number of power purchase agreements | Agreement	19
Rider CE | Virginia Electric and Power Company
Public Utilities, General Disclosures [Line Items]
Total revenue requirement	$ 182	[1],[2]
Public utilities number of solar generation projects | Project	2
Consolidation of Riders BW, GV and Four Other Riders | Virginia Electric and Power Company
Public Utilities, General Disclosures [Line Items]
Total revenue requirement	$ 348

[1] Associated with two solar generation projects, two small-scale solar projects and 19 purchased power agreements in addition to previously approved Rider CE projects.

[2] In addition, Virginia Power has a rider associated with another project with a total annual revenue requirement of $25 million as of March 31, 2025, and pending applications associated with other riders, including for the Chesterfield Energy Reliability Center described above, which if approved would result in a net annual revenue requirement increase of $53 million.