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Significant Financing Transactions (Narrative) (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2024 | Jan. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Oct. 31, 2023 | Nov. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Facility Limit | [1] | $ 6,000,000,000 |  | $ 6,000,000,000 |  |  |  |  |
Short-term debt |  | $ 3,626,000,000 |  | 3,626,000,000 |  | $ 3,956,000,000 | [2] |  |
Line of credit issued |  |  |  | $ 3,000,000,000 | $ 2,500,000,000 |  |  |  |
Preferred stock shares authorized |  | 20,000,000 |  | 20,000,000 |  |  |  |  |
Issuance of common stock |  |  |  | $ 31,000,000 | $ 43,000,000 |  |  |  |
Securities due within one year | [3] | $ 2,344,000,000 |  | $ 2,344,000,000 |  | 6,589,000,000 | [2] |  |
Common Stock |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchased, shares |  |  |  | 0 |  |  |  |  |
Issuance of stock (in shares) |  |  |  | 0 | 1,000,000 |  |  |  |
Stock repurchase program, authorized amount |  | 900,000,000 |  | $ 900,000,000 |  |  |  |  | $ 1,000,000,000
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 |  |  |  | $ 31,000,000 | $ 43,000,000 |  |  |  |
Issuance of stock (in shares) |  |  |  |  | 1,000,000 |  |  |  |
Various Programs | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Issuance of stock (in shares) |  |  |  | 1,000,000 |  |  |  |  |
Floating Rate Demand Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Short-term debt |  | 462,000,000 |  | $ 462,000,000 |  | 409,000,000 |  |  |
Floating Rate Demand Notes | Shelf Registration for Sale of Demand Notes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  | 3,000,000,000 |  |  |
DESC |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Facility Limit |  | 500,000,000 |  | 500,000,000 |  |  |  |  |
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 | [4] | 6,000,000,000 |  | 6,000,000,000 |  |  |  |  |
Short-term debt | [5] | 0 |  | $ 0 |  | 455,000,000 | [6] |  |
Issuance of stock (in shares) |  |  |  | 0 | 0 |  |  |  |
Securities due within one year | [5] | $ 100,000,000 |  | $ 100,000,000 |  | $ 381,000,000 | [6] |  |
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 |  | 1,000,000 |  | 1,000,000 |  |  |
Preferred stock shares outstanding |  | 1,000,000 |  | 1,000,000 |  | 1,000,000 |  |  |
Dominion Energy | Senior Notes Due In February 2024 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Recorded interest expense |  |  |  | $ 10,000,000 |  |  |  |  |
Joint Revolving Credit Facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Facility Limit |  | $ 6,000,000,000 |  | 6,000,000,000 |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  | $ 100,000,000 |  |  |  |
Letters of credit issued and outstanding |  | 58,000,000 |  | 58,000,000 |  | $ 54,000,000 |  |  |
Letter of Credit | Credit Facility, Maturing in June 2024 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Facility Limit |  | 30,000,000 |  | 30,000,000 |  |  |  |  |
Letter of credit |  | 0 |  | $ 0 |  | 25,000,000 |  |  |
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 |  | $ 200,000,000 |  |  |  |
Letter of credit |  |  |  |  |  | 0 |  |  |
Line of credit facility, maturity date |  |  | Jan. 31, 2026 |  |  |  |  |  |
Line of credit issued |  |  |  | $ 119,000,000 |  | 124,000,000 |  |  |
Letter of Credit | Virginia Electric and Power Company | Maximum |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  |  |  |  | 1,000,000 |  |  |
364 Term loan facility |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Securities due within one year |  |  |  |  |  | 2,500,000,000 |  |  |
364 Term loan facility | Credit Facility, Maturing In July 2024 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Facility Limit |  |  | $ 2,500,000,000 |  |  |  |  |  |
Repayments of borrowings |  | 2,500,000,000 |  |  |  |  |  |  |
364 Term loan facility | Credit Facility, Maturing In October 2024 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  | $ 2,250,000,000 |
Line of credit issued |  | 500,000,000 |  |  |  |  |  |  |
Repayments of borrowings |  | 1,800,000,000 |  |  |  |  |  |  |
Securities due within one year |  | 976,000,000 |  | $ 976,000,000 |  | $ 2,250,000,000 |  |  |
364 Term loan facility | Credit Facility, Maturing In October 2024 | General Corporate Purposes |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Line of credit issued |  | $ 500,000,000 |  |  |  |  |  |  |
[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] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | See Note 15 for amounts attributable to VIEs.
[4] | 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, 2024, 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.
[5] | See Note 15 for amounts attributable to VIEs.
[6] | Virginia Power’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.

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