Significant Financing Transactions (Narrative) (Detail) - USD ($)		1 Months Ended			3 Months Ended		6 Months Ended		12 Months Ended
		May 31, 2024	Mar. 31, 2024	Jan. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023		Oct. 31, 2023	Mar. 31, 2023	Nov. 30, 2020
Debt Instrument [Line Items]
Facility Limit	[1],[2]				$ 6,000,000,000		$ 6,000,000,000
Short-term debt					$ 3,162,000,000		3,162,000,000		$ 3,956,000,000	[3]
Line of credit issued							$ 3,000,000,000	$ 2,500,000,000
Preferred stock shares authorized					20,000,000		20,000,000
Issuance of common stock							$ 66,000,000	$ 85,000,000
Securities due within one year	[4]				$ 1,800,000,000		$ 1,800,000,000		6,589,000,000	[3]
Period of deferral		10 years
Common Stock
Debt Instrument [Line Items]
Stock repurchased, shares							0
Issuance of stock (in shares)					1,000,000	1,000,000	1,000,000	2,000,000
Stock repurchase program, authorized amount					$ 900,000,000		$ 900,000,000						$ 1,000,000,000
Series B Preferred Stock
Debt Instrument [Line Items]
Recorded dividend					$ 17,000,000	$ 9,000,000	$ 26,000,000	$ 18,000,000
Recorded dividends per share					$ 21.646	$ 11.625	$ 33.271	$ 23.25
Preferred stock tendered, aggregate liquidation preference					$ 440,000,000		$ 440,000,000
Deemed dividend					9,000,000		9,000,000
Series C Preferred Stock
Debt Instrument [Line Items]
Recorded dividend					$ 11,000,000	$ 11,000,000	$ 22,000,000	$ 22,000,000
Recorded dividends per share					$ 10.875	$ 10.875	$ 21.75	$ 21.75
At-the-Market Program | Maximum
Debt Instrument [Line Items]
Sale of stock authorized amount		$ 1,800,000,000
Forward Sale Agreements
Debt Instrument [Line Items]
Weighted average initial forward price					$ 52.39		$ 52.39
Forward sale agreements, number of shares of common stock to be settled					7,700,000		7,700,000
Various Programs
Debt Instrument [Line Items]
Issuance of common stock							$ 66,000,000	$ 85,000,000
Issuance of stock (in shares)							1,000,000	2,000,000
Floating Rate Demand Notes
Debt Instrument [Line Items]
Facility Limit									3,000,000,000
Short-term debt					$ 480,000,000		$ 480,000,000		409,000,000
DESC
Debt Instrument [Line Items]
Facility Limit					500,000,000		500,000,000
Virginia Electric and Power Company
Debt Instrument [Line Items]
Facility Limit	[5],[6]				6,000,000,000		6,000,000,000
Short-term debt					$ 0		$ 0		455,000,000	[7]
Issuance of stock (in shares)					0	0	0	0
Securities due within one year	[8]				$ 531,000,000		$ 531,000,000		$ 381,000,000	[7]
Interest Rate		3.80%
Aggregate outstanding principal		$ 243,000,000
Debt, maturity month and year		2027-05
Dominion Energy
Debt Instrument [Line Items]
Preferred stock shares issued					1,400,000		1,400,000		1,800,000
Preferred stock shares outstanding					1,400,000		1,400,000		1,800,000
Dominion Energy | 2024 Series A EJSNs
Debt Instrument [Line Items]
Debt instrument maturity year		2055
Interest reset period		5 years
Interest Rate		6.875%
Dominion Energy | 2024 Series B EJSNs
Debt Instrument [Line Items]
Debt instrument maturity year		2054
Interest reset period		5 years
Interest Rate		7.00%
Dominion Energy | U.S. Treasury Rate | 2024 Series A EJSNs
Debt Instrument [Line Items]
Interest rate spread		2.386%
Interest rate minimum reset		6.875%
Dominion Energy | U.S. Treasury Rate | 2024 Series B EJSNs
Debt Instrument [Line Items]
Interest rate spread		2.511%
Interest rate minimum reset		7.00%
Dominion Energy | Series B Preferred Stock
Debt Instrument [Line Items]
Preferred stock shares issued					400,000		400,000		800,000
Preferred stock shares outstanding					400,000		400,000		800,000
Stock repurchased, shares							400,000
Dominion Energy | Series C Preferred Stock
Debt Instrument [Line Items]
Preferred stock shares issued					1,000,000		1,000,000		1,000,000
Preferred stock shares outstanding					1,000,000		1,000,000		1,000,000
Dominion Energy | Senior Notes Due In February 2024
Debt Instrument [Line Items]
Recorded interest expense							$ 10,000,000
Dominion Energy | Enhanced Junior Subordinated Notes
Debt Instrument [Line Items]
Junior subordinated notes		$ 2,000,000,000
Dominion Energy | Enhanced Junior Subordinated Notes | 2024 Series A EJSNs
Debt Instrument [Line Items]
Junior subordinated notes		1,000,000,000
Dominion Energy | Enhanced Junior Subordinated Notes | 2024 Series B EJSNs
Debt Instrument [Line Items]
Junior subordinated notes		1,000,000,000
Joint Revolving Credit Facility
Debt Instrument [Line Items]
Facility Limit					$ 6,000,000,000		6,000,000,000
Letter of Credit
Debt Instrument [Line Items]
Facility Limit												$ 100,000,000
Letters of credit issued and outstanding					45,000,000		45,000,000		$ 54,000,000
Letter of Credit | Credit Facility, Maturing in June 2024
Debt Instrument [Line Items]
Facility Limit					30,000,000		$ 30,000,000
Letter of credit									25,000,000
Line of credit facility, maturity date							Jun. 30, 2024
Letter of Credit | Credit Facility in June 2024
Debt Instrument [Line Items]
Facility Limit					125,000,000		$ 125,000,000
Letters of credit issued and outstanding					0		0
Letter of Credit | Virginia Electric and Power Company
Debt Instrument [Line Items]
Facility Limit				$ 125,000,000								$ 300,000,000
Letter of credit									0
Line of credit facility, maturity date				Jan. 31, 2026
Line of credit issued							159,000,000		124,000,000
Letter of Credit | Virginia Electric and Power Company | Maximum
Debt Instrument [Line Items]
Letters of credit issued and outstanding									1,000,000
Letter of Credit | Virginia Electric and Power Company | Credit Facility in June 2024
Debt Instrument [Line Items]
Facility Limit					125,000,000		125,000,000
Letters of credit issued and outstanding					$ 0		$ 0
364 Term loan facility
Debt Instrument [Line Items]
Securities due within one year									2,500,000,000
364 Term loan facility | Credit Facility, Maturing In July 2024
Debt Instrument [Line Items]
Facility Limit				$ 2,500,000,000
Repayments of borrowings			$ 2,500,000,000
364 Term loan facility | Credit Facility, Maturing In October 2024
Debt Instrument [Line Items]
Facility Limit											$ 2,250,000,000
Line of credit issued			500,000,000
Repayments of borrowings		976,000,000	1,800,000,000
Securities due within one year									2,250,000,000
364 Term loan facility | Credit Facility, Maturing In October 2024 | General Corporate Purposes
Debt Instrument [Line Items]
Line of credit issued			$ 500,000,000
Sustainability Revolving Credit Facility | Dominion Energy
Debt Instrument [Line Items]
Line of credit facility, maturity date							Jun. 30, 2025
Repayments of borrowings		$ 450,000,000
Securities due within one year									$ 450,000,000

[1] In May 2024, the joint revolving credit facility was amended to remove Questar Gas as a co-borrower

[2] This credit facility matures in June 2026, with the potential to be extended by the borrowers to June 2028, and can be used by the borrowers under the credit facility to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit

[3] Dominion Energy’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.

[4] See Note 15 for amounts attributable to VIEs.

[5] In May 2024, the joint revolving credit facility was amended to remove Questar Gas as a co-borrower.

[6] The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy and DESC. The sub-limit for Virginia Power is set pursuant to the terms of the facility but can be changed at the option of the borrowers multiple times per year. At June 30, 2024, the sub-limit for Virginia Power was $1.75 billion. If Virginia Power has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in June 2026, with the potential to be extended by the borrowers to June 2028. The credit facility can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $2.0 billion (or the sub-limit, whichever is less) of letters of credit.

[7] Virginia Power’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.

[8] See Note 15 for amounts attributable to VIEs.