Long-Term Debt (Total Long Term Debt) (Detail) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Weighted-average percentage interest rates		5.69%	4.73%
Total principal		$ 40,206	$ 37,522
Securities due within one year and supplemental credit facility borrowings	[1],[2]	(6,839)	(2,848)
Unamortized discount, premium and debt issuances costs, net		(311)	(322)
Derivative restructuring	[3]	0	141
Finance lease liabilities	[4]	203	104
Total long-term debt		33,248	34,584
Long-term Debt
Debt Instrument [Line Items]
Finance lease liabilities		$ 192	91
Sustainability Revolving Credit Agreement, variable rate, due 2024
Debt Instrument [Line Items]
Weighted-average percentage interest rates	[5],[6]	6.28%
Total principal	[6]	$ 450	450
4.82%, due 2042
Debt Instrument [Line Items]
Weighted-average percentage interest rates	[2],[5]	4.82%
Total principal	[2]	$ 291	308
Term Loans, variable rate, due 2024
Debt Instrument [Line Items]
Weighted-average percentage interest rates	[5]	6.52%
Total principal		$ 4,750
Senior Notes | Variable rates, due 2023
Debt Instrument [Line Items]
Total principal			1,000
Senior Notes | 1.45% to 7.0%, due 2023 to 2052
Debt Instrument [Line Items]
Weighted-average percentage interest rates	[5],[7]	4.14%
Total principal	[7]	$ 11,476	12,476
Senior Notes | 2.30% to 8.875%, due 2023 to 2053
Debt Instrument [Line Items]
Total principal		$ 16,935	15,135
Junior Subordinated Debt | 3.071% due 2024
Debt Instrument [Line Items]
Weighted-average percentage interest rates	[5]	3.07%
Total principal		$ 700	700
Junior Subordinated Debt | 8.4% due 2031
Debt Instrument [Line Items]
Weighted-average percentage interest rates	[5]	8.40%
Total principal		$ 10	10
Enhanced Junior Subordinated Notes | 5.75% due 2054
Debt Instrument [Line Items]
Weighted-average percentage interest rates	[5]	5.75%
Total principal		$ 685	685
Tax-Exempt Financings | Tax-Exempt Financings, 0.75% to 3.65%, due 2032 to 2041
Debt Instrument [Line Items]
Total principal	[8]	$ 625	625
Tax-Exempt Financings | Variable Rate Due 2038
Debt Instrument [Line Items]
Weighted-average percentage interest rates	[5],[9]	3.87%
Total principal	[9]	$ 35	35
Tax-Exempt Financings | GENCO variable rate due 2038 [Member]
Debt Instrument [Line Items]
Weighted-average percentage interest rates	[5],[9]	3.87%
Total principal	[9]	$ 33	33
Tax-Exempt Financings | 3.625% and 4.00%, due 2028 and 2033
Debt Instrument [Line Items]
Weighted-average percentage interest rates	[5],[9]	3.90%
Total principal	[9]	$ 54	54
Tax-Exempt Financings | Other
Debt Instrument [Line Items]
Weighted-average percentage interest rates	[5],[9]	3.61%
Total principal	[9]	$ 1	1
Tax-Exempt Financings | Tax-Exempt Financing, 3.80% due 2033
Debt Instrument [Line Items]
Weighted-average percentage interest rates	[5]	3.80%
Total principal		$ 27	27
DECP Holdings | Term Loan, Variable Rate, Due 2024
Debt Instrument [Line Items]
Total principal	[10]		2,349
DESC | First mortgage bonds, 2.30% to 6.625%, due 2028 to 2065
Debt Instrument [Line Items]
Weighted-average percentage interest rates	[5]	5.23%
Total principal		$ 4,134	$ 3,634
Virginia Electric and Power Company
Debt Instrument [Line Items]
Weighted-average percentage interest rates		5.65%	4.68%
Total principal		$ 17,560	$ 15,760
Securities due within one year and supplemental credit facility borrowings	[1],[2]	(350)	(700)
Unamortized discount, premium and debt issuances costs, net		(167)	(144)
Finance lease liabilities	[4]	72	65
Total long-term debt		$ 17,115	14,981
Virginia Electric and Power Company | Senior Notes | 2.30% to 8.875%, due 2023 to 2053
Debt Instrument [Line Items]
Weighted-average percentage interest rates	[5]	4.25%
Total principal		$ 16,935	15,135
Virginia Electric and Power Company | Tax-Exempt Financings | Tax-Exempt Financings, 0.75% to 3.65%, due 2032 to 2041
Debt Instrument [Line Items]
Weighted-average percentage interest rates	[5],[8]	1.77%
Total principal	[8]	$ 625	$ 625

[1] Dominion Energy and Virginia Power’s weighted-average rate for securities due within one year was 5.79% and 3.45%, respectively, as of December 31, 2023.

[2] 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.

[3] Excludes $143 million at December 31, 2023 for Dominion Energy and $447 million at December 31, 2022, for both Dominion Energy and Virginia Power, representing the current portion which is presented within securities due within one year in the Companies’ Consolidated Balance Sheets.

[4] Dominion Energy includes $192 million and $91 million at December 31, 2023 and 2022, respectively, in other long-term debt, with the remaining balance in noncurrent liabilities held for sale, in its Consolidated Balance Sheets. Virginia Power’s balances are included in other long-term debt in its Consolidated Balance Sheets.

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

[6] This $900 million supplemental credit facility, entered in 2021, offers a reduced interest rate margin with respect to borrowed amounts allocated to certain environmental sustainability or social investment initiatives. Proceeds of the supplemental credit facility also may be used for general corporate purposes, but such proceeds are not eligible for a reduced interest rate margin. In May 2022, Dominion Energy borrowed $900 million. The proceeds from these borrowings were used to support environmental sustainability and social investment initiatives ($450 million) and for general corporate purposes ($450 million). In June 2022, Dominion Energy repaid $450 million borrowed for general corporate purposes. In March 2023, Dominion Energy borrowed $450 million with the proceeds used for general corporate purposes. In April 2023, Dominion Energy repaid $450 million borrowed for general corporate purposes. In September 2023, Dominion Energy borrowed $450 million under this facility with the proceeds used for general corporate purposes. In October 2023, Dominion Energy repaid $450 million borrowed for general corporate purposes.

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

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

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

[10] In connection with the sale of Dominion Energy’s interest in Cove Point, described further in Note 9, DECP Holdings’ outstanding term loan balance of $2.2 billion was repaid in September 2023. This term loan was scheduled to mature in December 2024.