Regulatory Matters - Schedule of Additional Significant Riders Associated with Virginia Power Projects (Parenthetical) (Detail) $ in Millions		1 Months Ended			12 Months Ended
		Jul. 31, 2023 USD ($)	May 31, 2023 USD ($)	Apr. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) Agreement Program Project
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Additional total revenue requirement					$ 90
Public utilities requested rate increase annual revenue of pending applications approval					6
Rider GV | Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Total revenue requirement	[1],[2]				135
Rider GV | Virginia Electric and Power Company | Rate Year Beginning April 2024
Public Utilities General Disclosures [Line Items]
Total revenue requirement					144
Rider GV | Virginia Electric and Power Company | Operating Segments
Public Utilities General Disclosures [Line Items]
Total revenue requirement					$ 148
Rider CE
Public Utilities General Disclosures [Line Items]
Public utilities number of small scale solar project | Project					1
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					5
Rider SNA | Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Total revenue requirement	[1],[3]				$ 50
Rider T1 | Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Total revenue requirement	[1],[4]				879
Rider U | Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Total revenue requirement	[1],[5]				74
DSM Riders | Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Total revenue requirement	[1],[6]				107
DSM Riders | Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Total revenue requirement	[1],[7]				93
Virginia Regulation | Rider SNA | Virginia Electric and Power Company | Operating Segments | First Phase of Nuclear Life Extension Program
Public Utilities General Disclosures [Line Items]
Projected capital investment					1,200
Virginia Regulation | Rider T1 | Virginia Electric and Power Company | Operating Segments
Public Utilities General Disclosures [Line Items]
Total revenue requirement					369
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					510
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					$ 150
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 program bundles | Program					4
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					4
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 | Base Rate Case | Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Total revenue requirement		$ 350	$ 351	$ 350

[1] In addition, Virginia Power has various riders associated with other projects with an aggregate total annual revenue requirement of approximately $90 million as of December 31, 2023. There are various pending applications associated with such riders, which if approved, would result in a net increase of approximately $6 million.

[2] The total revenue requirement requested is based on an estimated retirement of Greensville County in 2058, consistent with the current estimated useful life of the facility. Virginia Power also provided an alternative approach based on an estimated retirement of Greensville County in 2045, which if this alternative had been utilized, would have resulted in a revenue requirement of $144 million and $148 million for rate years beginning April 2024 and April 2025, respectively.

[3] Virginia Power requested approval of cost recovery of approximately $1.2 billion through Rider SNA for the first phase of nuclear life extension program which includes investments through 2024. In July 2022, the Virginia Commission approved a stipulation proposed by Virginia Power, the Virginia Commission staff and certain interested parties recommending that costs incurred after February 2022 associated with the first phase of the nuclear life extension program for North Anna be deferred and requested for recovery in a subsequent Rider SNA filing.

[4] Consists of $510 million for the transmission component of Virginia Power’s base rates and $369 million for Rider T1.

[5] Consists of previously approved phases of Rider U. In August 2023, the Virginia Commission approved Virginia Power’s request to extend the rider for the rate year beginning April 2023 through June 2024.

[6] Associated with an additional four new energy efficiency programs, one new demand response program and four new program bundles with a $150 million cost cap, with the ability to exceed the cost cap by no more than 15%.

[7] 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%.