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Short-Term Debt and Credit Agreements (Narrative) (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |
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Oct. 31, 2023 | Jul. 31, 2023 | Mar. 31, 2023 | Jan. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2021 | Nov. 30, 2023 | Oct. 01, 2023 | Aug. 01, 2023 | Feb. 28, 2023 | Feb. 27, 2023 | Dec. 31, 2022 | Nov. 30, 2022 | Jun. 30, 2021 | Oct. 31, 2020 | Nov. 30, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | $ 600,000,000 |  |  | $ 6,000,000,000 | [1] |  |  |  |  |  |  | $ 6,000,000,000 | [1] |  |  |  |
Line of credit issued |  |  |  |  |  | 5,725,000,000 |  | $ 1,265,000,000 |  |  |  |  |  |  |  |  |  |  |
Securities due within one year |  |  |  |  |  | 6,589,000,000 |  |  |  |  |  |  |  | 3,337,000,000 |  |  |  |  |
Short-term debt |  |  |  |  |  | $ 3,956,000,000 |  |  |  |  |  |  |  | $ 3,423,000,000 |  |  |  |  |
Weighted-average percentage interest rates |  |  |  |  |  | 5.69% |  |  |  |  |  |  |  | 4.73% |  |  |  |  |
Letters of credit outstanding, amount | [1] |  |  |  |  | $ 16,000,000 |  |  |  |  |  |  |  | $ 202,000,000 |  |  |  |  |
Floating Rate Demand Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  | $ 409,000,000 |  |  |  |  |  |  |  | $ 347,000,000 |  |  |  |  |
Weighted-average percentage interest rates |  |  |  |  |  | 5.50% |  |  |  |  |  |  |  | 4.24% |  |  |  |  |
Floating Rate Demand Notes | Shelf Registration for Sale of Demand Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000,000
Debt instrument, maximum principal outstanding amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |
Dominion Energy South Carolina Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term indebtedness outstanding |  |  |  | $ 2,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, maturity month and year |  |  |  | 2025-03 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Questar Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
GENCO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term indebtedness outstanding |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, maturity month and year |  |  |  | 2025-03 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | [2] |  |  |  |  | 6,000,000,000 |  |  |  |  |  |  |  | $ 6,000,000,000 |  |  |  |  |
Securities due within one year |  |  |  |  |  | 381,000,000 |  |  |  |  |  |  |  | 1,164,000,000 |  |  |  |  |
Short-term debt |  |  |  |  |  | $ 455,000,000 |  |  |  |  |  |  |  | $ 941,000,000 |  |  |  |  |
Weighted-average percentage interest rates |  |  |  |  |  | 5.65% |  |  |  |  |  |  |  | 4.68% |  |  |  |  |
Letters of credit outstanding, amount | [2] |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  | $ 140,000,000 |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,000,000,000 |  |
Revolving Credit Facility | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000,000 |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  | $ 100,000,000 |  | 54,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  |  |  | 54,000,000 |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Letter of Credit | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |
Letter of Credit | Credit Facility, Maturing in June 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |  | 25,000,000 |  |  |  |  |
Letter of Credit | Credit Facility Maturing In June 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  |  |  | Jun. 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  | 2,000,000,000 |  |  |  |  |
Line of credit issued |  |  |  |  |  | 124,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | Virginia Electric and Power Company | Credit Facility, Maturing in January 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  |  |  |  | Jan. 31, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facilities Maturing in December 2021 with 1 Year Automatic Renewals Through 2024 | DECP Holdings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  | $ 110,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Automatic renewal period |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  |  | $ 110,000,000 |  |  |  |  |  |  |  | 110,000,000 |  |  |  |  |
Letters of credit borrowed, amount |  |  |  |  |  | 0 |  |  |  |  |  |  |  | $ 0 |  |  |  |  |
364 Term loan facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  | $ 500,000,000 |  |  | $ 2,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  | $ 1,000,000,000 | $ 1,000,000,000 |  |  |  |  | $ 225,000,000 | $ 750,000,000 | $ 500,000,000 |  |  |  |  |  |  |
Securities due within one year |  |  |  |  |  | 2,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility remaining borrowing and terminated |  | 225,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  |  |  |  | Jan. 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
364 Term loan facility | Term Loan Facility, Maturing in July 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  |  | Jul. 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
364 Term loan facility | Term Loan Facility, Maturing in Oct 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  | $ 2,250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities due within one year |  |  |  |  |  | 2,250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  | Oct. 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
364 Term loan facility | General Corporate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  | $ 1,000,000,000 |  |  |  | $ 750,000,000 |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |
364 Term loan facility | Cove Point |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | 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.
[2] | The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Questar Gas 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 December 31, 2023, 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.

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Date the credit facility terminates, in YYYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount of long-term debt and lease obligation, classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
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