Regulatory Matters (Narrative) (Detail 1)		1 Months Ended															2 Months Ended	3 Months Ended				9 Months Ended	12 Months Ended							24 Months Ended
		Oct. 31, 2024 USD ($) MW	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($) Bcf / d	May 31, 2024 USD ($)	Feb. 29, 2024 USD ($)	Nov. 30, 2023 USD ($)	Oct. 31, 2023 USD ($) Project MW	Jul. 31, 2023 USD ($)	May 31, 2023 USD ($)	Apr. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	May 31, 2022 USD ($)	Dec. 31, 2020 USD ($)	Apr. 30, 2020 USD ($) MW	Nov. 30, 2013 mi kV	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Sep. 30, 2022	Dec. 31, 2024 USD ($)		Dec. 31, 2023 USD ($)		Dec. 31, 2022 USD ($)		Dec. 31, 2021 USD ($)	Dec. 31, 2024
Public Utilities General Disclosures [Line Items]
Impairment of assets and other charges																							$ 600,000,000		$ 307,000,000		$ 1,401,000,000
Depreciation and amortization																							2,345,000,000	[1]	2,580,000,000	[2]	2,442,000,000	[3]
Virginia Regulation
Public Utilities General Disclosures [Line Items]
Cap on revenue reductions in triennial review																													$ 50,000,000
Percentage of electric energy excluding existing nuclear generation and certain new carbon resources															100.00%
Cap on revenue reductions in the first triennial															$ 50,000,000
Authorized return percentage						9.35%			9.35%
Percentage of earned return									9.04%
Virginia Regulation | Securitization Option | Annual Fuel Factor
Public Utilities General Disclosures [Line Items]
Increase (decrease) in revenue requirement												$ 541,000,000
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Estimated under-recovered balances						$ 1,300,000,000																	1,300,000,000
Depreciation and amortization	[4]																						1,644,000,000		$ 1,871,000,000		$ 1,736,000,000
Virginia Electric and Power Company | Impairment of Assets and Other Charges
Public Utilities General Disclosures [Line Items]
Impairment of assets and other charges																					$ 191,000,000		25,000,000
Impairment of assets and other charges (benefits)																		$ 17,000,000
Impairment of assets and other charges (benefits) after tax																		$ 12,000,000
Impairment of assets and other charges after tax																					142,000,000		$ 18,000,000
Virginia Electric and Power Company | Annual Fuel Factor
Public Utilities General Disclosures [Line Items]
Increase (decrease) in revenue requirement										$ 13,000,000
Virginia Electric and Power Company | Rider RGGI | Impairment of Assets and Other Charges
Public Utilities General Disclosures [Line Items]
Impairment of assets and other charges																					180,000,000
Impairment of assets and other charges (benefits) after tax																					$ 134,000,000
Depreciation and amortization																				$ 33,000,000
Depreciation and amortization after tax																				$ 25,000,000
Virginia Electric and Power Company | Income Payment Program
Public Utilities General Disclosures [Line Items]
Total revenue requirement														$ 93,000,000
Universal service fee								$ 71,000,000
Virginia Electric and Power Company | Utility-scale Solar
Public Utilities General Disclosures [Line Items]
Targeted capacity provided by legislation | MW		208						329
Number of utility-scale projects | Project								4
Proposed cost of project		$ 605,000,000						$ 850,000,000
Virginia Electric and Power Company | Virginia LNG Storage Facility
Public Utilities General Disclosures [Line Items]
Liquefied equivalent | Bcf / d				2
Regasify storage capacity				25.00%
Liquefy storage capacity				1.00%
Facility expected cost, excluding financing costs				$ 550,000,000
Virginia Electric and Power Company | Virginia Regulation
Public Utilities General Disclosures [Line Items]
Public utilities event costs to be recovered							$ 45,000,000
One-time credits to customers			$ 15,000,000
Authorized return percentage						9.70%			9.70%		9.70%
Authorized return percentage credited to customers bills											1.50%
Credited to customers bills percentage											100.00%
Capitalization ratio									52.10%		52.10%								52.10%
Virginia Electric and Power Company | Virginia Regulation | Base Rate Case
Public Utilities General Disclosures [Line Items]
Total revenue requirement									$ 350,000,000		$ 350,000,000
Virginia Electric and Power Company | Virginia Regulation | Annual Fuel Factor
Public Utilities General Disclosures [Line Items]
Total revenue requirement					$ 2,200,000,000					$ 2,300,000,000			$ 2,300,000,000
Estimated over-recovered balances																	$ 266,000,000
Rate year beginning					2024-07					2023-07			2022-07
Estimated under-recovered balances										$ 1,300,000,000			$ 1,000,000,000
Increase (decrease) in revenue requirement					$ 636,000,000								1,800,000,000
Public utilities collection of requested under-recovered projected fuel expense period																						3 years
Public utilities collection of requested under-recovered projected fuel expense beginning date																						Jul. 01, 2022
Public utilities exclude from recovery through base rates one half of financing costs period																						3 years
Virginia Electric and Power Company | Virginia Regulation | Annual Fuel Factor | Maximum
Public Utilities General Disclosures [Line Items]
Increase (decrease) in revenue requirement													$ 1,300,000,000
Virginia Electric and Power Company | Virginia Regulation | Generation And Distribution Services
Public Utilities General Disclosures [Line Items]
Authorized return percentage							9.05%
Virginia Electric and Power Company | Virginia Regulation | Surry Switching Station Transmission Line
Public Utilities General Disclosures [Line Items]
Miles of Lines | mi																7
Type of Line | kV																500
Virginia Electric and Power Company | Virginia Regulation | Transmission Line from Skiffes Creek Switching Station to Wheaton Substation
Public Utilities General Disclosures [Line Items]
Miles of Lines | mi																20
Type of Line | kV																230
Virginia Electric and Power Company | Virginia Regulation | Securitization Option | Annual Fuel Factor
Public Utilities General Disclosures [Line Items]
Estimated under-recovered balances										$ 1,300,000,000
Virginia Electric and Power Company | Virginia Regulation | Solar And Onshore Wind | End of Year 2035
Public Utilities General Disclosures [Line Items]
Targeted capacity provided by legislation | MW															16,100
Virginia Electric and Power Company | Virginia Regulation | Utility-scale Solar
Public Utilities General Disclosures [Line Items]
Targeted capacity provided by legislation | MW															3,000
Virginia Electric and Power Company | Virginia Regulation | Utility-scale Solar | End of Year 2035 | Maximum
Public Utilities General Disclosures [Line Items]
Targeted capacity provided by legislation | MW															15,000
Virginia Electric and Power Company | Virginia Regulation | Small-scale Solar | End of Year 2035
Public Utilities General Disclosures [Line Items]
Targeted capacity provided by legislation | MW															1,100
Virginia Electric and Power Company | Virginia Regulation | Energy Storage | End of Year 2035
Public Utilities General Disclosures [Line Items]
Targeted capacity provided by legislation | MW															2,700
Virginia Electric and Power Company | Triennial Review
Public Utilities General Disclosures [Line Items]
Authorized return percentage											70.00%
Credited to customers bills percentage											85.00%
Virginia Electric and Power Company | Biennial Review
Public Utilities General Disclosures [Line Items]
Authorized return percentage						70.00%					9.35%																			9.70%
Authorized return percentage credited to customers bills											1.50%
Credited to customers bills percentage											85.00%

[1] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.

[2] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.

[3] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.

[4] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Virginia Power’s CODM.