Regulatory Matters - Schedule of Additional Significant Riders Associated with Virginia Power Projects (Detail) - Virginia Electric and Power Company $ in Millions	6 Months Ended
	Jun. 30, 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 GEN
Public Utilities General Disclosures [Line Items]
Application Date	2024-06	[3]
Approval Date	Pending	[3]
Rate Year Beginning	2025-04	[3]
Total Revenue Requirement (millions)	$ 438	[1],[3]
Rider GEN One
Public Utilities General Disclosures [Line Items]
Application Date	2024-06
Approval Date	Pending
Rate Year Beginning	2026-04
Total Revenue Requirement (millions)	$ 311	[1]
Increase (decrease) in revenue requirement	$ (127)
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 OSW
Public Utilities General Disclosures [Line Items]
Application Date	2023-11
Approval Date	July 2024
Rate Year Beginning	2024-09
Total Revenue Requirement (millions)	$ 486	[1]
Increase (decrease) in revenue requirement	$ 215
Rider RPS
Public Utilities General Disclosures [Line Items]
Application Date	2023-12	[4]
Approval Date	Pending
Rate Year Beginning	2024-09
Total Revenue Requirement (millions)	$ 358	[1]
Increase (decrease) in revenue requirement	$ 262
Rider SNA
Public Utilities General Disclosures [Line Items]
Application Date	2023-10
Approval Date	July 2024
Rate Year Beginning	2024-09
Total Revenue Requirement (millions)	$ 69	[1]
Increase (decrease) in revenue requirement	$ 19
Rider T1
Public Utilities General Disclosures [Line Items]
Application Date	2024-05	[5]
Approval Date	July 2024	[5]
Rate Year Beginning	2024-09	[5]
Total Revenue Requirement (millions)	$ 1,170	[1],[5]
Increase (decrease) in revenue requirement	$ 291	[5]
Rider U
Public Utilities General Disclosures [Line Items]
Application Date	2023-10	[6]
Approval Date	July 2024	[6]
Rate Year Beginning	2024-08	[6]
Total Revenue Requirement (millions)	$ 150	[1],[6]
Increase (decrease) in revenue requirement	$ 76	[6]
DSM Riders
Public Utilities General Disclosures [Line Items]
Application Date	2023-12	[7]
Approval Date	July 2024	[7]
Rate Year Beginning	2024-09	[7]
Total Revenue Requirement (millions)	$ 86	[1],[7]
Increase (decrease) in revenue requirement	$ (21)	[7]

[1] In addition, Virginia Power has various riders associated with other projects with an aggregate total annual revenue requirement of approximately $20 million as of June 30, 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] 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 requests approval to recover costs associated with the Virginia LNG Storage Facility described above.

[4] Virginia Power amended its application in February 2024.

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

[6] 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.

[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%.