Long-Term Debt (Total Long Term Debt) (Parenthetical) (Detail) - USD ($) $ in Millions		1 Months Ended				12 Months Ended
		Oct. 31, 2023	Sep. 30, 2023	Apr. 30, 2023	Jun. 30, 2022	Dec. 31, 2023	Dec. 31, 2022	Feb. 23, 2024	Mar. 31, 2023	Aug. 31, 2022	Aug. 31, 2021	Jul. 31, 2016
Debt Instrument [Line Items]
Debt repurchased value										$ 154	$ 39
Aggregate outstanding principal						$ 40,206	$ 37,522
Weighted-average percentage interest rates						5.69%	4.73%
Derivative restructuring current						$ 143	$ 447
March 2023
Debt Instrument [Line Items]
Debt, amount redeemed									$ 450
Sustainability Revolving Credit Agreement | May Twenty Twenty Two
Debt Instrument [Line Items]
Debt, amount redeemed						900
Junior Subordinated Debt
Debt Instrument [Line Items]
Interest Rate												5.25%
Debt instrument, face amount												$ 800
Virginia Electric and Power Company
Debt Instrument [Line Items]
Aggregate outstanding principal						$ 17,560	$ 15,760
Weighted-average percentage interest rates						5.65%	4.68%
Dominion Energy
Debt Instrument [Line Items]
Term loan repaid			$ 2,200
Dominion Energy | Sustainability Revolving Credit Agreement
Debt Instrument [Line Items]
Debt instrument, face amount						$ 900
Dominion Energy | Environmental Sustainability And Social Investment Initiatives | Sustainability Revolving Credit Agreement
Debt Instrument [Line Items]
Proceeds from borrowings							$ 450
Dominion Energy | General Corporate | Sustainability Revolving Credit Agreement
Debt Instrument [Line Items]
Proceeds from borrowings						450
Repayments of borrowings		$ 450	$ 450	$ 450	$ 450
1.45% to 7.0%, due 2023 to 2052 | Senior Notes
Debt Instrument [Line Items]
Aggregate outstanding principal	[1]					$ 11,476	12,476
Weighted-average percentage interest rates	[1],[2]					4.14%
1.45% to 7.0%, due 2023 to 2052 | Minimum | Senior Notes
Debt Instrument [Line Items]
Interest Rate						1.45%
1.45% to 7.0%, due 2023 to 2052 | Maximum | Senior Notes
Debt Instrument [Line Items]
Interest Rate						7.00%
3.071% due 2024 | Junior Subordinated Debt
Debt Instrument [Line Items]
Interest Rate						3.071%
Aggregate outstanding principal						$ 700	700
Weighted-average percentage interest rates	[2]					3.07%
8.4% due 2031 | Junior Subordinated Debt
Debt Instrument [Line Items]
Interest Rate						8.40%
Aggregate outstanding principal						$ 10	10
Weighted-average percentage interest rates	[2]					8.40%
5.75% due 2054 | Enhanced Junior Subordinated Notes
Debt Instrument [Line Items]
Interest Rate						5.75%
Aggregate outstanding principal						$ 685	685
Weighted-average percentage interest rates	[2]					5.75%
Unsecured Senior Notes, 2.30% to 8.875%, due 2023 to 2053 | Senior Notes
Debt Instrument [Line Items]
Aggregate outstanding principal						$ 16,935	15,135
Unsecured Senior Notes, 2.30% to 8.875%, due 2023 to 2053 | Virginia Electric and Power Company | Senior Notes
Debt Instrument [Line Items]
Aggregate outstanding principal						$ 16,935	15,135
Weighted-average percentage interest rates	[2]					4.25%
Unsecured Senior Notes, 2.30% to 8.875%, due 2023 to 2053 | Minimum | Virginia Electric and Power Company
Debt Instrument [Line Items]
Interest Rate						2.30%
Unsecured Senior Notes, 2.30% to 8.875%, due 2023 to 2053 | Maximum | Virginia Electric and Power Company
Debt Instrument [Line Items]
Interest Rate						8.875%
Tax-Exempt Financings, 0.75% to 1.90%, due 2032 to 2041 | Minimum | Virginia Electric and Power Company
Debt Instrument [Line Items]
Interest Rate						0.75%
Tax-Exempt Financings, 0.75% to 3.65%, due 2032 to 2041 | Tax-Exempt Financings
Debt Instrument [Line Items]
Aggregate outstanding principal	[3]					$ 625	625
Tax-Exempt Financings, 0.75% to 3.65%, due 2032 to 2041 | Virginia Electric and Power Company | Tax-Exempt Financings
Debt Instrument [Line Items]
Aggregate outstanding principal	[3]					$ 625	625
Weighted-average percentage interest rates	[2],[3]					1.77%
Tax-Exempt Financings, 0.75% to 3.65%, due 2032 to 2041 | Maximum | Virginia Electric and Power Company
Debt Instrument [Line Items]
Interest Rate						3.65%
First mortgage bonds, 2.30% to 6.625%, due 2028 to 2065 | Minimum | DESC
Debt Instrument [Line Items]
Interest Rate						2.30%
First mortgage bonds, 2.30% to 6.625%, due 2028 to 2065 | Maximum | DESC
Debt Instrument [Line Items]
Interest Rate						6.625%
3.625% and 4.00%, due 2028 and 2033 | Tax-Exempt Financings
Debt Instrument [Line Items]
Aggregate outstanding principal	[4]					$ 54	54
Weighted-average percentage interest rates	[2],[4]					3.90%
3.625% and 4.00%, due 2028 and 2033 | Minimum | Tax-Exempt Financings
Debt Instrument [Line Items]
Interest Rate						3.625%
3.625% and 4.00%, due 2028 and 2033 | Maximum | Tax-Exempt Financings
Debt Instrument [Line Items]
Interest Rate						4.00%
4.82%, due 2042
Debt Instrument [Line Items]
Interest Rate						4.82%
Aggregate outstanding principal	[5]					$ 291	308
Weighted-average percentage interest rates	[2],[5]					4.82%
4.82%, due 2042 | Eagle Solar, LLC | Subsequent Event
Debt Instrument [Line Items]
Debt repurchased value								$ 279
Tax-Exempt Financing, 3.80% due 2033
Debt Instrument [Line Items]
Interest Rate						3.80%
Tax-Exempt Financing, 3.80% due 2033 | Tax-Exempt Financings
Debt Instrument [Line Items]
Aggregate outstanding principal						$ 27	$ 27
Weighted-average percentage interest rates	[2]					3.80%
Industrial Revenue Bonds
Debt Instrument [Line Items]
Aggregate outstanding principal						$ 68
Long term debt due within one year | Virginia Electric and Power Company
Debt Instrument [Line Items]
Weighted-average percentage interest rates						3.45%
Long term debt due within one year | Dominion Energy
Debt Instrument [Line Items]
Weighted-average percentage interest rates						5.79%

[1] Includes debt assumed by Dominion Energy from the merger of its former CNG subsidiary.

[2] Represents weighted-average coupon rates for debt outstanding as of December 31, 2023.

[3] These financings relate to certain pollution control equipment at Virginia Power’s generating facilities.

[4] Industrial revenue bonds totaling $68 million are secured by letters of credit that expire, subject to renewal, in the fourth quarter of 2024.

[5] Represents debt associated with Eagle Solar. In February 2024, Eagle Solar redeemed the remaining principal outstanding of $279 million. The debt which otherwise would have matured in 2042 was nonrecourse to Dominion Energy and was secured by Eagle Solar's interest in certain solar facilities. As such, these borrowings are presented within securities due within one year in Dominion Energy’s Consolidated Balance Sheets at December 31, 2023.