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Long-Term Debt (Total Long Term Debt) (Parenthetical) (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Aug. 31, 2022 | Aug. 31, 2021 | Jul. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt repurchased value |  |  | $ 263,000,000 |  | $ 154,000,000 | $ 39,000,000 |
Aggregate outstanding principal |  |  | $ 41,872,000,000 | $ 37,694,000,000 |  |  |
Weighted-average percentage interest rates |  |  | 4.73% | 0.31% |  |  |
Derivative restructuring current |  |  | $ 447,000,000 | $ 0 |  |  |
Interest and Related Charges |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Gain on early redemption of senior notes |  |  | 35,000,000 |  |  |  |
Gain on early redemption of senior notes, after-tax |  |  | 26,000,000 |  |  |  |
Sustainability Revolving Credit Agreement | June Twenty Twenty One |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, amount redeemed |  |  |  | 250,000,000 |  |  |
Sustainability Revolving Credit Agreement | August Twenty Twenty One |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, amount redeemed |  |  |  | 650,000,000 |  |  |
Sustainability Revolving Credit Agreement | November Twenty Twenty One |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of borrowings |  |  |  | 650,000,000 |  |  |
Sustainability Revolving Credit Agreement | December Twenty Twenty One |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of borrowings |  |  |  | 250,000,000 |  |  |
Sustainability Revolving Credit Agreement | May Twenty Twenty Two |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, amount redeemed |  |  | 900,000,000 |  |  |  |
Junior Subordinated Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  | 5.25%
Debt instrument, face amount |  |  |  |  |  |  | $ 800,000,000
Environmental Sustainability And Social Investment Initiatives |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from borrowings |  |  |  | 250,000,000 |  |  |
General Corporate Purposes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from borrowings |  |  |  | 650,000,000 |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate outstanding principal |  |  | $ 15,760,000,000 | $ 13,863,000,000 |  |  |
Weighted-average percentage interest rates |  |  | 4.68% | 0.26% |  |  |
Dominion Energy | Sustainability Revolving Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 900,000,000 |  |  |  |
Dominion Energy | Environmental Sustainability And Social Investment Initiatives | Sustainability Revolving Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from borrowings |  |  | 450,000,000 |  |  |  |
Dominion Energy | General Corporate Purposes | Sustainability Revolving Credit Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from borrowings |  |  | 450,000,000 |  |  |  |
Repayments of borrowings |  | $ 450,000,000 |  |  |  |  |
1.45% to 7.0%, due 2022 to 2052 | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate outstanding principal | [1],[2] |  | $ 12,476,000,000 | $ 11,238,000,000 |  |  |
Weighted-average percentage interest rates | [1],[2],[3] |  | 4.01% |  |  |  |
1.45% to 7.0%, due 2022 to 2052 | Minimum | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest Rate |  |  | 1.45% |  |  |  |
1.45% to 7.0%, due 2022 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 |  |  | $ 700,000,000 | 700,000,000 |  |  |
Weighted-average percentage interest rates | [3] |  | 3.07% |  |  |  |
8.4% due 2031 | Junior Subordinated Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest Rate |  |  | 8.40% |  |  |  |
Aggregate outstanding principal |  |  | $ 10,000,000 | 10,000,000 |  |  |
Weighted-average percentage interest rates | [3] |  | 8.40% |  |  |  |
5.75% due 2054 | Enhanced Junior Subordinated Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest Rate |  |  | 5.75% |  |  |  |
Aggregate outstanding principal |  |  | $ 685,000,000 | 685,000,000 |  |  |
Weighted-average percentage interest rates | [3] |  | 5.75% |  |  |  |
Unsecured Senior Notes, 2.30% to 8.875%, due 2022 to 2052 | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate outstanding principal |  |  | $ 15,135,000,000 | 13,238,000,000 |  |  |
Unsecured Senior Notes, 2.30% to 8.875%, due 2022 to 2052 | Virginia Electric and Power Company | Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate outstanding principal |  |  | $ 15,135,000,000 | 13,238,000,000 |  |  |
Weighted-average percentage interest rates | [3] |  | 3.99% |  |  |  |
Unsecured Senior Notes, 2.30% to 8.875%, due 2022 to 2052 | Minimum | Virginia Electric and Power Company |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest Rate |  |  | 2.30% |  |  |  |
Unsecured Senior Notes, 2.30% to 8.875%, due 2022 to 2052 | 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 | Tax-Exempt Financings |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate outstanding principal | [4] |  | $ 625,000,000 | 625,000,000 |  |  |
Tax-Exempt Financings, 0.75% to 1.90%, due 2032 to 2041 | Virginia Electric and Power Company | Tax-Exempt Financings |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate outstanding principal | [4] |  | $ 625,000,000 | 625,000,000 |  |  |
Weighted-average percentage interest rates | [3],[4] |  | 1.32% |  |  |  |
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 1.90%, due 2032 to 2041 | Maximum | Virginia Electric and Power Company |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest Rate |  |  | 1.90% |  |  |  |
2.21% to 7.20%, due 2024 to 2052 | Minimum | Questar Gas Company |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest Rate |  |  | 2.21% |  |  |  |
2.21% to 7.20%, due 2024 to 2052 | Maximum | Questar Gas Company |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest Rate |  |  | 7.20% |  |  |  |
1.30% to 6.38%, due 2025 to 2052 | Minimum | East Ohio |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest Rate |  |  | 1.30% |  |  |  |
1.30% to 6.38%, due 2025 to 2052 | Maximum | East Ohio |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest Rate |  |  | 6.38% |  |  |  |
3.10% to 7.45%, due 2026 to 2051 | Minimum | PSNC |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest Rate |  |  | 3.10% |  |  |  |
3.10% to 7.45%, due 2026 to 2051 | Maximum | PSNC |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest Rate |  |  | 7.45% |  |  |  |
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 | [5] |  | $ 54,000,000 | 54,000,000 |  |  |
Weighted-average percentage interest rates | [3],[5] |  | 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 | [6] |  | $ 308,000,000 | 314,000,000 |  |  |
Weighted-average percentage interest rates | [3],[6] |  | 4.82% |  |  |  |
Tax-Exempt Financing, 3.8% due 2033 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest Rate |  |  | 3.80% |  |  |  |
Tax-Exempt Financing, 3.8% due 2033 | Tax-Exempt Financings |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate outstanding principal |  |  | $ 27,000,000 | $ 27,000,000 |  |  |
Weighted-average percentage interest rates | [3] |  | 3.80% |  |  |  |
Industrial Revenue Bonds |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate outstanding principal |  |  | $ 68,000,000 |  |  |  |
Long term debt due within one year | Virginia Electric and Power Company |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted-average percentage interest rates |  |  | 2.75% |  |  |  |
Long term debt due within one year | Dominion Energy |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted-average percentage interest rates |  |  | 3.69% |  |  |  |
[1] | In 2022, Dominion Energy repurchased $263 million of senior notes with various interest rates and maturity dates. Gains related to the early redemption of the senior notes were $35 million ($26 million after-tax) reflected within interest and related charges in Dominion Energy’s Consolidated Statements of Income.
[2] | Includes debt assumed by Dominion Energy from the merger of its former CNG subsidiary.
[3] | Represents weighted-average coupon rates for debt outstanding as of December 31, 2022.
[4] | These financings relate to certain pollution control equipment at Virginia Power’s generating facilities.
[5] | Industrial revenue bonds totaling $68 million are secured by letters of credit that expire, subject to renewal, in the fourth quarter of 2023.
[6] | Represents debt associated with Eagle Solar. The debt is nonrecourse to Dominion Energy and is secured by Eagle Solar’s interest in certain solar facilities.

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