Long-Term Debt (Based on Stated Maturity Dates Rather than Early Redemption Dates that Could be Elected by Instrument Holders) (Detail) $ in Millions	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
2024	$ 6,581
2025	1,519
2026	2,140
2027	1,804
2028	1,309
Thereafter	26,853
Total	$ 40,206
Weighted- average coupon, 2024	5.83%
Weighted- average coupon, 2025	3.57%
Weighted- average coupon, 2026	2.64%
Weighted- average coupon, 2027	3.77%
Weighted- average coupon, 2028	4.01%
Weighted- average coupon, Thereafter	4.57%
Sustainability Revolving Credit Agreement
Debt Instrument [Line Items]
2024	$ 450
Total	450
Term loans
Debt Instrument [Line Items]
2024	4,750
Total	4,750
First mortgage bonds
Debt Instrument [Line Items]
2028	53
Thereafter	4,081
Total	4,134
Unsecured senior notes
Debt Instrument [Line Items]
2024	650
2025	1,500
2026	2,120
2027	1,783
2028	1,195
Thereafter	21,164
Total	28,412
Secured senior notes
Debt Instrument [Line Items]
2024	31	[1]
2025	19	[1]
2026	20	[1]
2027	21	[1]
2028	22	[1]
Thereafter	178	[1]
Total	291	[1]
Tax-exempt financings
Debt Instrument [Line Items]
2028	39
Thereafter	735
Total	774
Unsecured junior subordinated notes payable to affiliated trusts
Debt Instrument [Line Items]
Thereafter	10
Total	10
Unsecured junior subordinated notes
Debt Instrument [Line Items]
2024	700
Total	700
Enhanced Junior Subordinated Notes
Debt Instrument [Line Items]
Thereafter	685
Total	685
Virginia Electric and Power Company
Debt Instrument [Line Items]
2024	350
2025	350
2026	1,150
2027	1,350
2028	700
Thereafter	13,660
Total	$ 17,560
Weighted- average coupon, 2024	3.45%
Weighted- average coupon, 2025	3.10%
Weighted- average coupon, 2026	3.08%
Weighted- average coupon, 2027	3.61%
Weighted- average coupon, 2028	3.80%
Weighted- average coupon, Thereafter	4.37%
Virginia Electric and Power Company | Unsecured senior notes
Debt Instrument [Line Items]
2024	$ 350
2025	350
2026	1,150
2027	1,350
2028	700
Thereafter	13,035
Total	16,935
Virginia Electric and Power Company | Tax-exempt financings
Debt Instrument [Line Items]
Thereafter	625
Total	$ 625

[1] 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.