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Significant Financing Transactions (Narrative) (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 5 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2024 | Sep. 30, 2024 | Aug. 31, 2024 | Jun. 30, 2024 | May 31, 2024 | Mar. 31, 2024 | Jan. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Oct. 31, 2023 | Mar. 31, 2023 | Nov. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | [1],[2] |  | $ 6,000,000,000 |  |  |  |  |  | $ 6,000,000,000 |  | $ 6,000,000,000 | $ 6,000,000,000 |  |  |  |  |  |
Short-term debt |  |  | $ 4,104,000,000 |  |  |  |  |  | $ 4,104,000,000 |  | $ 4,104,000,000 | 4,104,000,000 |  | $ 3,956,000,000 | [3] |  |  |
Line of credit issued |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000,000 | $ 3,475,000,000 |  |  |  |  |
Preferred stock shares authorized |  |  | 20,000,000 |  |  |  |  |  | 20,000,000 |  | 20,000,000 | 20,000,000 |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  |  | $ 102,000,000 | $ 91,000,000 |  |  |  |  |
Securities due within one year | [4] |  | $ 1,820,000,000 |  |  |  |  |  | $ 1,820,000,000 |  | $ 1,820,000,000 | $ 1,820,000,000 |  | 6,589,000,000 | [3] |  |  |
Period of deferral |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, shares |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  | 1,000,000 | 0 |  | 2,000,000 | 2,000,000 |  |  |  |  |
Stock repurchase program, authorized amount |  |  | $ 900,000,000 |  |  |  |  |  | $ 900,000,000 |  | $ 900,000,000 | $ 900,000,000 |  |  |  |  |  | $ 1,000,000,000
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded dividend |  |  |  |  |  |  |  |  | $ 4,000,000 | $ 9,000,000 |  | $ 21,000,000 | $ 27,000,000 |  |  |  |  |
Recorded dividends per share |  |  |  |  |  |  |  |  | $ 11.625 | $ 11.625 |  | $ 33.172 | $ 34.875 |  |  |  |  |
Preferred stock tendered, aggregate liquidation preference |  |  |  |  | $ 440,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Deemed dividend |  |  |  |  |  |  |  |  |  |  |  | $ 9,000,000 |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded dividend |  |  |  |  |  |  |  |  | $ 11,000,000 | $ 11,000,000 |  | $ 33,000,000 | $ 33,000,000 |  |  |  |  |
Recorded dividends per share |  |  |  |  |  |  |  |  | $ 10.875 | $ 10.875 |  | $ 32.625 | $ 32.625 |  |  |  |  |
Various Programs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  |  |  |  | $ 102,000,000 | $ 91,000,000 |  |  |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 | 2,000,000 |  |  |  |  |
At-the-Market Program | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock authorized amount |  |  |  |  |  | $ 1,800,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Forward Sale Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average initial forward price per share |  |  | $ 57.62 |  |  |  |  |  |  |  | $ 53.23 |  |  |  |  |  |  |
Forward sale agreements, number of shares of common stock to be settled |  |  | 3,800,000 |  |  |  |  |  |  |  | 11,400,000 |  |  |  |  |  |  |
Floating Rate Demand Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000,000 |  |  |  |
Short-term debt |  |  | $ 482,000,000 |  |  |  |  |  | $ 482,000,000 |  | $ 482,000,000 | $ 482,000,000 |  | 409,000,000 |  |  |  |
DESC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | 500,000,000 |  |  |  |  |  | 500,000,000 |  | 500,000,000 | 500,000,000 |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | [5],[6] |  | 6,000,000,000 |  |  |  |  |  | 6,000,000,000 |  | 6,000,000,000 | 6,000,000,000 |  |  |  |  |  |
Short-term debt |  |  | 740,000,000 |  |  |  |  |  | $ 740,000,000 |  | 740,000,000 | $ 740,000,000 |  | 455,000,000 | [7] |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  | 0 | 0 |  | 0 | 0 |  |  |  |  |
Securities due within one year |  |  | $ 540,000,000 |  |  |  |  |  | $ 540,000,000 |  | $ 540,000,000 | $ 540,000,000 |  | $ 381,000,000 | [7] |  |  |
Interest Rate |  |  |  |  |  | 3.80% |  |  |  |  |  |  |  |  |  |  |  |
Aggregate outstanding principal |  |  |  |  |  | $ 243,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt, maturity month and year |  |  |  |  |  | 2027-05 |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Senior Notes Due in 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity year |  |  |  | 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 5.05% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued amount |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Senior Notes Due in 2054 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity year |  |  |  | 2054 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 5.55% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued amount |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  | 1,400,000 |  |  |  |  |  | 1,400,000 |  | 1,400,000 | 1,400,000 |  | 1,800,000 |  |  |  |
Preferred stock shares outstanding |  |  | 1,400,000 |  |  |  |  |  | 1,400,000 |  | 1,400,000 | 1,400,000 |  | 1,800,000 |  |  |  |
Dominion Energy | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  | 400,000 |  |  |  |  |  | 400,000 |  | 400,000 | 400,000 |  | 800,000 |  |  |  |
Preferred stock shares outstanding |  |  | 400,000 |  |  |  |  |  | 400,000 |  | 400,000 | 400,000 |  | 800,000 |  |  |  |
Stock repurchased, shares |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy | Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares issued |  |  | 1,000,000 |  |  |  |  |  | 1,000,000 |  | 1,000,000 | 1,000,000 |  | 1,000,000 |  |  |  |
Preferred stock shares outstanding |  |  | 1,000,000 |  |  |  |  |  | 1,000,000 |  | 1,000,000 | 1,000,000 |  | 1,000,000 |  |  |  |
Dominion Energy | 2024 Series A EJSNs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity year |  |  |  |  |  | 2055 |  |  |  |  |  |  |  |  |  |  |  |
Interest reset period |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  | 6.875% |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread |  |  |  |  |  | 2.386% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  |  |  |  |  | us-gaap:UsTreasuryUstInterestRateMember |  |  |  |  |  |  |  |  |  |  |  |
Interest rate minimum reset |  |  |  |  |  | 6.875% |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy | 2024 Series B EJSNs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity year |  |  |  |  |  | 2054 |  |  |  |  |  |  |  |  |  |  |  |
Interest reset period |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread |  |  |  |  |  | 2.511% |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] |  |  |  |  |  | us-gaap:UsTreasuryUstInterestRateMember |  |  |  |  |  |  |  |  |  |  |  |
Interest rate minimum reset |  |  |  |  |  | 7.00% |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy | Senior Notes Due In February 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded interest expense |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |
Dominion Energy | Enhanced Junior Subordinated Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  |  |  |  | $ 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy | Enhanced Junior Subordinated Notes | 2024 Series A EJSNs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy | Enhanced Junior Subordinated Notes | 2024 Series B EJSNs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy | 3.80% Peninsula Ports Authority Due in 2033 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity year |  | 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  | 3.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, redeemed remaining principal outstanding |  | $ 27,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy | 3.80% Peninsula Ports Authority Due in 2033 | Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early redemption charges to be paid |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy | October 2014 Hybrids | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity year |  | 2054 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, redeemed remaining principal outstanding |  | $ 685,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early redemption charges to be paid |  | $ 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Joint Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | $ 6,000,000,000 |  |  |  |  |  | $ 6,000,000,000 |  | $ 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 |  |  | 48,000,000 |  |  |  |  |  | 48,000,000 |  | 48,000,000 | 48,000,000 |  | $ 54,000,000 |  |  |  |
Letter of Credit | Credit Facility, Maturing in June 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | 30,000,000 |  |  |  |  |  | 30,000,000 |  | 30,000,000 | $ 30,000,000 |  |  |  |  |  |
Letter of credit |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000,000 |  |  |  |
Line of credit facility, maturity date |  |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2024 |  |  |  |  |  |
Letter of Credit | Credit Facility in June 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  | 0 |  |  |  |  |  | 0 |  | 0 | $ 0 |  |  |  |  |  |
Letter of Credit | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |  | $ 300,000,000 |
Letter of credit |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Line of credit facility, maturity date |  |  |  |  |  |  |  | Jan. 31, 2026 |  |  |  |  |  |  |  |  |  |
Line of credit issued |  |  |  |  |  |  |  |  |  |  |  | 123,000,000 |  | 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 |  |  |  |
Letter of Credit | Virginia Electric and Power Company | Credit Facility in June 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  | $ 21,000,000 |  |  |  |  |  | $ 21,000,000 |  | $ 21,000,000 | $ 21,000,000 |  |  |  |  |  |
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 |  |  |  |  |  | 976,000,000 | 1,800,000,000 |  |  |  |  |  |  |  |  |  |  |
Securities due within one year |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |
Sustainability Revolving Credit Facility | Dominion Energy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maturity date |  |  |  |  | Jun. 30, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of borrowings |  |  |  |  |  | $ 450,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Securities due within one year |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 450,000,000 |  |  |  |
[1] | In May 2024, the joint revolving credit facility was amended to remove Questar Gas as a co-borrower
[2] | 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
[3] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2023 has been derived from the audited Consolidated Balance Sheet at that date.
[4] | See Note 15 for amounts attributable to VIEs.
[5] | In May 2024, the joint revolving credit facility was amended to remove Questar Gas as a co-borrower.
[6] | The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy 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 September 30, 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.
[7] | 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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