Regulatory Matters - Schedule of Additional Significant Riders Associated with Virginia Power Projects (Detail) - Virginia Electric and Power Company $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Rider CCR
Public Utilities General Disclosures [Line Items]
Application Date	2024-03
Approval Date	Pending
Rate Year Beginning	2024-12
Total Revenue Requirement (millions)	$ 103	[1]
Increase (decrease) in revenue requirement	$ (91)
Rider CE
Public Utilities General Disclosures [Line Items]
Application Date	2023-10	[2]
Approval Date	March 2024	[2]
Rate Year Beginning	2024-05	[2]
Total Revenue Requirement (millions)	$ 133	[1],[2]
Increase (decrease) in revenue requirement	$ 44	[2]
Rider GT
Public Utilities General Disclosures [Line Items]
Application Date	2023-08
Approval Date	May 2024
Rate Year Beginning	2024-06
Total Revenue Requirement (millions)	$ 145	[1]
Increase (decrease) in revenue requirement	$ 131
Rider T1
Public Utilities General Disclosures [Line Items]
Application Date	2024-05	[3]
Approval Date	Pending	[3]
Rate Year Beginning	2024-09	[3]
Total Revenue Requirement (millions)	$ 1,170	[1]
Increase (decrease) in revenue requirement	$ 291

[1] In addition, Virginia Power has various riders associated with other projects with an aggregate total annual revenue requirement of approximately $120 million as of March 31, 2024.

[2] The Virginia Commission approved four solar generation projects and 13 power purchase agreements in addition to previously approved Rider CE projects. In addition, the approved total revenue requirement includes amounts which had previously been collected under a separate rider.

[3] Consists of $532 million for the transmission component of Virginia Power’s base rates and $638 million for Rider T1.