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Significant Financing Transactions (Narrative) (Detail) - USD ($) | 1 Months Ended | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2023 | Mar. 31, 2023 | Jan. 31, 2023 | Mar. 31, 2023 | Mar. 31, 2022 | Feb. 28, 2023 | Dec. 31, 2022 | Nov. 30, 2020 | Aug. 31, 2020 | Jul. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | [1] |  | $ 6,000,000,000 |  | $ 6,000,000,000 |  |  |  |  |  |  |
Short-term debt |  |  | 3,546,000,000 |  | 3,546,000,000 |  |  | $ 3,423,000,000 | [2] |  |  |
Line of credit issued |  |  |  |  | 2,500,000,000 |  |  |  |  |  |  |
Supplemental credit facility borrowings |  |  | $ 900,000,000 |  | $ 900,000,000 |  |  | 450,000,000 | [2] |  |  |
Preferred stock shares authorized |  |  | 20,000,000 |  | 20,000,000 |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  | $ 43,000,000 | $ 45,000,000 |  |  |  |  |  |
Issuance of stock |  |  |  |  | $ 43,000,000 | $ 45,000,000 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, shares |  |  |  |  | 0 |  |  |  |  |  |  |
Issuance of stock (in shares) |  |  |  |  | 1,000,000 | 1,000,000 |  |  |  |  |  |
Issuance of stock |  |  |  |  | $ 43,000,000 | $ 45,000,000 |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 |  | $ 3,000,000,000.0
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Recorded dividend |  |  |  |  |  | $ 7,000,000 |  |  |  |  |  |
Recorded dividends per share |  |  |  |  |  | $ 4.375 |  |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Recorded dividend |  |  |  |  | $ 9,000,000 | $ 9,000,000 |  |  |  |  |  |
Recorded dividends per share |  |  |  |  | $ 11.625 | $ 11.625 |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Recorded dividend |  |  |  |  | $ 11,000,000 | $ 11,000,000 |  |  |  |  |  |
Recorded dividends per share |  |  |  |  | $ 10.875 | $ 10.875 |  |  |  |  |  |
Various Programs |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  | $ 43,000,000 | $ 45,000,000 |  |  |  |  |  |
Issuance of stock (in shares) |  |  |  |  | 1,000,000 | 1,000,000 |  |  |  |  |  |
Floating Rate Demand Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  | $ 389,000,000 |  | $ 389,000,000 |  |  | 347,000,000 |  |  |  |
Floating Rate Demand Notes | Shelf Registration for Sale of Demand Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  | 3,000,000,000.0 |  |  |  |
DESC |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | 500,000,000 |  | 500,000,000 |  |  |  |  |  |  |
DESC | Short-term Indebtedness |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | 2,200,000,000 |  | 2,200,000,000 |  |  |  |  |  |  |
Questar Gas Company |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | 250,000,000 |  | 250,000,000 |  |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | [3] |  | 6,000,000,000 |  | 6,000,000,000 |  |  |  |  |  |  |
Short-term debt |  |  | $ 1,010,000,000 |  | $ 1,010,000,000 |  |  | $ 941,000,000 | [4] |  |  |
Issuance of stock (in shares) |  |  |  |  | 0 | 0 |  |  |  |  |  |
Virginia Electric and Power Company | Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt, maturity month and year |  |  | 2023-12 |  |  |  |  |  |  |  |  |
Reduction in securities due within one year |  |  | $ 448,000,000 |  | $ 448,000,000 |  |  |  |  |  |  |
Derivative notional value |  |  |  |  |  |  |  |  |  |  | $ 900,000,000 |
Virginia Electric and Power Company | Senior Notes Due in 2033 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  | $ 750,000,000 |  | $ 750,000,000 |  |  |  |  |  |  |
Interest rate percentage |  |  | 5.00% |  | 5.00% |  |  |  |  |  |  |
Debt maturity year |  |  |  |  | 2033 |  |  |  |  |  |  |
Virginia Electric and Power Company | Senior Notes Due in 2053 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total Long-term Debt |  |  | $ 750,000,000 |  | $ 750,000,000 |  |  |  |  |  |  |
Interest rate percentage |  |  | 5.45% |  | 5.45% |  |  |  |  |  |  |
Debt maturity year |  |  |  |  | 2053 |  |  |  |  |  |  |
Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  | 1,800,000 |  | 1,800,000 |  |  | 1,800,000 |  |  |  |
Preferred stock shares outstanding |  |  | 1,800,000 |  | 1,800,000 |  |  | 1,800,000 |  |  |  |
Dominion Energy | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  | 800,000 |  | 800,000 |  |  | 800,000 |  |  |  |
Preferred stock shares outstanding |  |  | 800,000 |  | 800,000 |  |  | 800,000 |  |  |  |
Dominion Energy | Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  | 1,000,000.0 |  | 1,000,000.0 |  |  | 1,000,000.0 |  |  |  |
Preferred stock shares outstanding |  |  | 1,000,000.0 |  | 1,000,000.0 |  |  | 1,000,000.0 |  |  |  |
GENCO | Short-term Indebtedness |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | $ 200,000,000 |  | $ 200,000,000 |  |  |  |  |  |  |
Joint Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | 6,000,000,000.0 |  | 6,000,000,000.0 |  |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | 100,000,000 |  | 100,000,000 |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  | 0 |  | 0 |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  | 0 |  | 0 |  |  |  |  |  |  |
Letter of Credit | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  | 1,000,000 |  | 1,000,000 |  |  |  |  |  |  |
Letter of Credit | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit issued |  | $ 58,000,000 |  |  |  |  |  |  |  |  |  |
Letter of Credit | Credit Facility, Maturing in June 2022 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  | 25,000,000 |  | 25,000,000 |  |  | $ 25,000,000 |  |  |  |
Letter of Credit | Credit Facility, Maturing in June 2024 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | 30,000,000 |  | $ 30,000,000 |  |  |  |  |  |  |
Line of credit facility, maturity date |  |  |  |  | Jun. 30, 2024 |  |  |  |  |  |  |
Letter of Credit | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | 125,000,000 | $ 125,000,000 | $ 125,000,000 |  |  |  |  |  |  |
Line of credit facility, maturity date |  |  |  | Jan. 31, 2026 |  |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  | 0 |  | $ 0 |  |  |  |  |  |  |
Letter of Credit | Virginia Electric and Power Company | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Line of credit issued |  | 80,000,000 |  |  |  |  |  |  |  |  |  |
Sustainability Revolving Credit Agreement | Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt maturity year |  |  |  |  | 2024 |  |  |  |  |  |  |
Supplemental credit facility borrowings |  |  | 900,000,000 |  | $ 900,000,000 |  |  | $ 450,000,000 |  |  |  |
Sustainability Revolving Credit Agreement | Dominion Energy | General Corporate Purposes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings |  |  | 450,000,000 |  |  |  |  |  |  |  |  |
Sustainability Revolving Credit Agreement | Dominion Energy | General Corporate Purposes | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayments of borrowings |  | $ 450,000,000 |  |  |  |  |  |  |  |  |  |
364 Term loan facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  | $ 2,500,000,000 |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  | $ 1,000,000,000.0 | $ 1,000,000,000.0 | $ 1,000,000,000.0 |  | $ 500,000,000 |  |  |  |  |
Line of credit facility, maturity date |  |  |  | Jan. 31, 2024 |  |  |  |  |  |  |  |
[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] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | 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 March 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.
[4] | Virginia Power’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date.

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- Definition The carrying value as of the balance sheet date of the noncurrent portion 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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 14 -URI https://asc.fasb.org/extlink&oid=99376301&loc=d3e1336-112600 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 45 -Paragraph 13 -URI https://asc.fasb.org/extlink&oid=99376301&loc=d3e1314-112600 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585 + Details
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