Regulatory Matters (Narrative) (Detail) shares in Millions, $ in Millions	1 Months Ended										3 Months Ended			6 Months Ended		12 Months Ended
	Jul. 31, 2023 USD ($) shares	May 31, 2023 USD ($)	Apr. 30, 2023 USD ($)	Mar. 31, 2023 USD ($) mi kV	Feb. 28, 2023 USD ($)	Jan. 31, 2023 USD ($)	Oct. 31, 2022 USD ($) MW	Jun. 30, 2022 USD ($)	May 31, 2022 USD ($)	Mar. 31, 2022	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) Components Project	Jun. 30, 2022 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2022 USD ($)		Dec. 31, 2011	Dec. 31, 2008
Public Utilities General Disclosures [Line Items]
Regulatory liabilities											$ 583			$ 583			$ 946	[1]
Generation And Distribution Services | Subsequent Event
Public Utilities General Disclosures [Line Items]
Authorized return percentage	9.70%
Virginia Regulation | Subsequent Event
Public Utilities General Disclosures [Line Items]
Percentage of earned return	9.04%
Authorized return percentage	9.35%
North Carolina Regulation | Public Service Company Of North Carolina
Public Utilities General Disclosures [Line Items]
Application date				2023-03
North Carolina Regulation | Public Service Company Of North Carolina | Rider D
Public Utilities General Disclosures [Line Items]
Increase(Decrease) in gas cost					$ (56)
Approval date					2023-03
North Carolina Regulation | Public Service Company Of North Carolina | Rider DSM
Public Utilities General Disclosures [Line Items]
Increase (Decrease) in customer usage tracker				$ 23
Ohio Regulation | PIR Program
Public Utilities General Disclosures [Line Items]
Application date														2023-02
Percentage of pipeline system replaced																				25.00%
Increases of annual capital expenditures percentage			3.00%
Total gross plant investment estimated cost																	225
Proposed revenue requirement																	305
Cumulative gross plant investment estimated cost																	2,400
Ohio Regulation | CEP Program
Public Utilities General Disclosures [Line Items]
Application date														2023-03
Total gross plant investment estimated cost																	195
Proposed revenue requirement																	1,300
Cumulative gross plant investment estimated cost																	151
Percentage of debt rate on capital investments																			6.50%
Ohio Regulation | UEX Rider
Public Utilities General Disclosures [Line Items]
Public utilities, under-recovered accumulated bad debt expense												$ 9
Actual revenue requirement														$ 23
Ohio Regulation | UEX Rider | Forecast
Public Utilities General Disclosures [Line Items]
Recovery of bad debt expense																$ 14
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Impairment of assets and other charges											38		$ 409	45	$ 413
Regulatory liabilities											231			231			$ 506	[2]
Virginia Electric and Power Company | Subsequent Event
Public Utilities General Disclosures [Line Items]
Authorized but unissued shares of common stock | shares	3,250
Virginia Electric and Power Company | Annual Fuel Factor
Public Utilities General Disclosures [Line Items]
Increase (decrease) in revenue requirement		$ (13)
Virginia Electric and Power Company | Annual Fuel Factor | Impairment of Assets and Other Charges
Public Utilities General Disclosures [Line Items]
Impairment of assets and other charges													191
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
Virginia Electric and Power Company | Utility Scale Solar
Public Utilities General Disclosures [Line Items]
Proposed cost of project							$ 1,200
Targeted capacity provided by legislation | MW							474
Virginia Electric and Power Company | Energy Storage
Public Utilities General Disclosures [Line Items]
Targeted capacity provided by legislation | MW							16
Virginia Electric and Power Company | Electric Distribution Grid Transformation Projects
Public Utilities General Disclosures [Line Items]
Proposed cost of project											$ 1,100			1,100
Proposed operations and maintenance investment														$ 71
Number of electric distribution grid transformation projects | Project														14
Number of electric distribution grid transformation projects components | Components														6
Virginia Electric and Power Company | Virginia Regulation
Public Utilities General Disclosures [Line Items]
Rate year beginning		2023-07
Authorized return percentage			9.70%
Authorized return percentage credited to customers bills			100.00%
Capitalization ratio			52.10%
Estimated under-recovered balances														$ 1,300
Virginia Electric and Power Company | Virginia Regulation | Subsequent Event
Public Utilities General Disclosures [Line Items]
Authorized return percentage	9.70%
Capitalization ratio	52.10%
Virginia Electric and Power Company | Virginia Regulation | Base Rate Case
Public Utilities General Disclosures [Line Items]
Total revenue requirement		$ 351	$ 350
Virginia Electric and Power Company | Virginia Regulation | Base Rate Case | Subsequent Event
Public Utilities General Disclosures [Line Items]
Total revenue requirement	$ 350
Virginia Electric and Power Company | Virginia Regulation | Annual Fuel Factor
Public Utilities General Disclosures [Line Items]
Total revenue requirement		$ 2,300							$ 2,300
Rate year beginning		2023-07							2022-07
Increase (decrease) in revenue requirement		$ 631												$ (541)
Fuel cost requirement		3,300
Impairment of assets and other charges after tax													142
Estimated under-recovered balances		$ 1,300						$ 1,000							$ 578
Public utilities collection of requested under-recovered projected fuel expense period															3 years
Virginia Electric and Power Company | Virginia Regulation | Rider RGGI
Public Utilities General Disclosures [Line Items]
Impairment of assets and other charges after tax													$ 134
Virginia Electric and Power Company | Biennial Review
Public Utilities General Disclosures [Line Items]
Authorized return percentage	0.70%		9.35%
Credited to customers bills percentage			85.00%
Authorized return percentage credited to customers bills			1.50%
Virginia Electric and Power Company | Triennial Review
Public Utilities General Disclosures [Line Items]
Authorized return percentage			0.70%
Credited to customers bills percentage			85.00%
Dominion Energy South Carolina Inc | South Carolina Regulation | Electric Other
Public Utilities General Disclosures [Line Items]
Increase (decrease) in revenue requirement					$ 24
Dominion Energy South Carolina Inc | South Carolina Regulation | Rider DSM
Public Utilities General Disclosures [Line Items]
Approval request to recover costs and net lost revenues amount						$ 46
Dominion Energy South Carolina Inc | South Carolina Regulation | Cost Of Fuel
Public Utilities General Disclosures [Line Items]
Increase (decrease) in annual base fuel component recoveries			$ 176	$ 121
Dominion Energy South Carolina Inc | South Carolina Regulation | Electric Transmission Project
Public Utilities General Disclosures [Line Items]
Application date				2023-03
Type of Line | kV				230
Miles of Lines | mi				19
Cost Estimate				$ 55								$ 55
Dominion Energy South Carolina Inc | South Carolina Regulation | Natural Gas Base Rate Case
Public Utilities General Disclosures [Line Items]
Increase (decrease) in revenue requirement				$ 19
Percentage of proposed earned return				10.38%
Authorized return percentage										10.25%
Questar Gas Company | Utah Regulation
Public Utilities General Disclosures [Line Items]
Increase(Decrease) in gas cost				$ 92	$ 164
Approval date					2023-02

[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date.

[2] Virginia Power’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date.