Regulatory Matters - Schedule of Additional Significant Riders Associated with Virginia Power Projects (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) Program Project Agreement
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Additional total revenue requirement	$ 18
Public utilities requested rate increase annual revenue of pending applications approval	$ 24
Rider CE
Public Utilities General Disclosures [Line Items]
Public utilities number of power purchase agreements | Agreement	13
Rider CE | Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Public utilities number of solar generation projects | Project	4
Total revenue requirement	$ 133	[1],[2]
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	24
Rider CE | Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Public utilities number of solar generation projects | Project	2
Rider SNA | Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Total revenue requirement	$ 69	[1]
Rider T1 | Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Total revenue requirement	1,170	[1],[3]
Rider U | Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Total revenue requirement	150	[1],[4],[5]
DSM Riders | Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Total revenue requirement	86	[1],[6]
DSM Riders | Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Total revenue requirement	97	[1],[7]
Electric Distribution Grid Transformation Projects | Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Total revenue requirement	103
Underground Distribution Facilities
Public Utilities General Disclosures [Line Items]
Total revenue requirement	166
Consolidation of Riders BW, GV and Four Other Riders | Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Total revenue requirement	348
Virginia Regulation | Rider SNA | Virginia Electric and Power Company | Operating Segments | Second Phase Of Nuclear Life Extension Program
Public Utilities General Disclosures [Line Items]
Projected capital investment	1,700
Virginia Regulation | Rider T1 | Virginia Electric and Power Company | Operating Segments
Public Utilities General Disclosures [Line Items]
Total revenue requirement	638
Virginia Regulation | Rider T1 | Virginia Electric and Power Company | Operating Segments | Transmission Component Of Virginia Powers
Public Utilities General Disclosures [Line Items]
Total revenue requirement	532
Virginia Regulation | Rider U | Virginia Electric and Power Company | Seven Phase
Public Utilities General Disclosures [Line Items]
Projected capital investment	78
Virginia Regulation | Rider U | Virginia Electric and Power Company | Previous Phase
Public Utilities General Disclosures [Line Items]
Projected capital investment	72
Virginia Regulation | DSM Riders | Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Amount of cost cap recovery	$ 102
Public utilities energy efficiency program cost exceed percentage	15.00%
Virginia Regulation | DSM Riders | Virginia Electric and Power Company | Operating Segments
Public Utilities General Disclosures [Line Items]
Number of new demand response programs | Program	1
Virginia Regulation | DSM Riders | Virginia Electric and Power Company | Operating Segments | Energy Efficiency Program
Public Utilities General Disclosures [Line Items]
Number of new energy efficiency programs | Program	3
Virginia Regulation | DSM Riders | Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Amount of cost cap recovery	$ 222
Public utilities energy efficiency program cost exceed percentage	15.00%
Virginia Regulation | DSM Riders | Virginia Electric and Power Company | Operating Segments
Public Utilities General Disclosures [Line Items]
Number of new demand response programs | Program	1
Number of new redesigned demand response programs | Program	2
Number of demand response pilot | Program	1
Virginia Regulation | DSM Riders | Virginia Electric and Power Company | Operating Segments | Energy Efficiency Program
Public Utilities General Disclosures [Line Items]
Number of redesigned energy efficiency programs | Program	3

[1] In addition, Virginia Power has various riders associated with other projects with an aggregate total annual revenue requirement of approximately $18 million as of December 31, 2024. There are various pending applications associated with such riders, which if approved, would result in a net increase of approximately $24 million.

[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.

[4] Consists of $72 million for previously approved phases and $78 million for phase seven costs for Rider U. In addition, the Virginia Commission approved Virginia Power’s request to extend existing rates for Rider U through July 2024.

[5] Rider DIST consists of $103 million in total revenue requirement for certain previously approved electric distribution grid transformation projects and $166 million for previously approved phases and proposed phase eight of certain new underground distribution facilities. If approved, would result in the consolidation of Riders GT and U and cease the separate collection of rates under these riders effective June 1, 2025.

[6] Associated with an additional three new energy efficiency programs and one new demand response program with a $102 million cost cap, with the ability to exceed the cost cap by no more than 15%.

[7] Associated with three redesigned energy efficiency programs, one new and two redesigned demand response program and one demand response pilot with a $222 million cost cap, with the ability to exceed the cost cap by no more than 15%.