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, 2025 USD ($)
Rider CCR
Public Utilities General Disclosures [Line Items]
Application Date	2025-04	[1]
Approval Date	Pending	[1]
Rate Year Beginning	2026-01	[1]
Total Revenue Requirement (millions)	$ 166	[1],[2]
Increase (decrease) in revenue requirement	$ (63)	[1]
Rider CE
Public Utilities General Disclosures [Line Items]
Application Date	2024-10	[3]
Approval Date	April 2025	[3]
Rate Year Beginning	2025-05	[3]
Total Revenue Requirement (millions)	$ 182	[2],[3]
Increase (decrease) in revenue requirement	$ 49	[3]
Rider GEN
Public Utilities General Disclosures [Line Items]
Application Date	2024-06	[4]
Approval Date	February 2025	[4]
Rate Year Beginning	2025-04	[4]
Total Revenue Requirement (millions)	$ 438	[2],[4]
Rider GEN One
Public Utilities General Disclosures [Line Items]
Application Date	2024-06
Approval Date	February 2025
Rate Year Beginning	2026-04
Total Revenue Requirement (millions)	$ 311	[2]
Increase (decrease) in revenue requirement	$ (127)
Rider GT
Public Utilities General Disclosures [Line Items]
Application Date	2025-03
Approval Date	Pending
Rate Year Beginning	2025-06
Total Revenue Requirement (millions)	$ 283	[2]
Increase (decrease) in revenue requirement	$ 138

[1] In connection with this application, Virginia Power also requests to extend existing rates for Rider CCR by one month through December 2025.

[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.

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

[4] Rider GEN includes $348 million in total revenue requirement related to the consolidation of Riders BW, GV and four other riders associated with generation facilities, ceasing the separate collection of rates under these riders effective April 1, 2025 and the extension of existing rates for Rider BW through March 2025. In addition, Virginia Power also received approval to recover costs associated with the Virginia LNG Storage Facility through Rider GEN described in Note 13 to the Consolidated Financial Statements in the Companies’ Annual Report on Form 10-K for the year ended December 31, 2024.