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Significant Financing Transactions (Narrative) (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 | May 31, 2025 | Apr. 30, 2025 | Feb. 28, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024 | Jul. 31, 2025 | Jan. 31, 2025 | Dec. 31, 2023 | Mar. 31, 2023 | Nov. 30, 2020 | Nov. 30, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | $ 8,000,000,000 |  |  |  |  | $ 8,000,000,000 |  |  | $ 8,000,000,000 |  |  |  |  |  |  |  |  |
Short-term debt | $ 3,775,000,000 |  |  |  |  | $ 3,775,000,000 |  |  | 3,775,000,000 |  | $ 2,500,000,000 | [1] |  |  |  |  |  |
Line of credit issued |  |  |  |  |  |  |  |  | $ 0 | $ 3,000,000,000 |  |  |  |  |  |  |  |
Preferred stock shares authorized | 20,000,000 |  |  |  |  | 20,000,000 |  |  | 20,000,000 |  |  |  |  |  |  |  |  |
Dividend stock |  |  |  |  |  | $ 11,000,000 |  | $ 28,000,000 | $ 22,000,000 | 48,000,000 |  |  |  |  |  |  |  |
Borrowings outstanding | $ 0 |  |  |  |  | 0 |  |  | 0 |  | 0 |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  | 70,000,000 | 66,000,000 |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  | $ 35,000,000 |  | $ 36,000,000 | $ 70,000,000 | $ 67,000,000 |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, shares |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |
Issuance of stock (in shares) |  |  |  |  |  | 0 |  | 1,000,000 | 1,000,000 | 1,000,000 |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  | $ 35,000,000 |  | $ 36,000,000 | $ 70,000,000 | $ 67,000,000 |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount | $ 900,000,000 |  |  |  |  | $ 900,000,000 |  |  | 900,000,000 |  |  |  |  |  |  |  | $ 1,000,000,000 |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock tendered, aggregate liquidation preference |  |  |  |  | $ 440,000,000 |  |  | 440,000,000 |  | 440,000,000 |  |  |  |  |  |  |  |
Deemed dividends |  |  |  |  | $ 9,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Various Programs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  |  |  |  | $ 70,000,000 | $ 66,000,000 |  |  |  |  |  |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |
Various Programs | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock (in shares) |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |
Sales Agency Agreements to Effect Sales Under At-the-market Program | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock authorized amount |  |  |  | $ 1,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward Sale Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average initial forward price per share |  |  |  |  |  | $ 55.83 |  |  | $ 55.34 |  |  |  |  |  |  |  |  |
Forward sale agreements, number of shares of common stock to be settled | 11,000,000 |  |  |  |  | 11,000,000 | 8,800,000 |  | 11,000,000 |  |  |  |  |  |  |  |  |
Aggregate Forward Sale Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average initial forward price per share |  |  |  |  |  |  |  |  | $ 56.62 |  |  |  |  |  |  |  |  |
Forward sale agreements, number of shares of common stock to be settled | 18,500,000 |  |  |  |  | 18,500,000 |  |  | 18,500,000 |  |  |  |  |  |  |  |  |
Floating Rate Demand Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt | $ 424,000,000 |  |  |  |  | $ 424,000,000 |  |  | $ 424,000,000 |  | 439,000,000 |  |  |  |  |  |  |
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 | 1,000,000,000 |  | $ 500,000,000 |  |  | 1,000,000,000 |  |  | 1,000,000,000 |  |  |  |  |  |  |  |  |
Short-term indebtedness outstanding |  |  |  |  |  |  | $ 1,800,000,000 |  |  |  |  |  |  |  |  |  |  |
DESC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  |  |  | $ 900,000,000 |  |  |  |  |
GENCO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term indebtedness outstanding |  |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | 7,000,000,000 |  |  |  |  | 7,000,000,000 |  |  | 7,000,000,000 |  |  |  |  |  |  |  |  |
Short-term debt | 1,745,000,000 |  |  |  |  | 1,745,000,000 |  |  | 1,745,000,000 |  | $ 950,000,000 | [2] |  |  |  |  |  |
Issuance of common stock | 2,100,000,000 |  |  |  |  |  |  |  | 2,100,000,000 | $ 0 |  |  |  |  |  |  |  |
Issuance of common stock | $ 3,500,000,000 |  |  |  |  | $ 2,100,000,000 |  |  | $ 2,100,000,000 |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock (in shares) | 30,006 |  |  |  |  | 30,000 |  |  | 30,000 |  | 0 |  |  |  |  |  |  |
Issuance of common stock |  |  |  |  |  | $ 2,100,000,000 |  |  | $ 2,100,000,000 |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Senior Notes Due In 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity year |  |  |  |  |  |  | 2035 |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  | 5.15% |  |  |  |  |  |  |  |  |  |  |
Debt issued amount |  |  |  |  |  |  | $ 625,000,000 |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Senior Notes Due In 2055 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity year |  |  |  |  |  |  | 2055 |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  | 5.65% |  |  |  |  |  |  |  |  |  |  |
Debt issued amount |  |  |  |  |  |  | $ 625,000,000 |  |  |  |  |  |  |  |  |  |  |
Dominion Energy | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |
Preferred stock shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |
Dividend stock |  |  |  |  |  |  |  | 17,000,000 |  | $ 26,000,000 |  |  |  |  |  |  |  |
Preferred stock dividend per share |  |  |  |  |  |  |  |  |  | $ 33.271 |  |  |  |  |  |  |  |
Stock repurchased, shares |  |  |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy | Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares outstanding | 1,000,000 |  |  |  |  | 1,000,000 |  |  | 1,000,000 |  | 1,000,000 |  |  |  |  |  |  |
Dividend stock |  |  |  |  |  | $ 11,000,000 |  | $ 11,000,000 | $ 22,000,000 | $ 22,000,000 |  |  |  |  |  |  |  |
Preferred stock dividend per share |  |  |  |  |  | $ 10.875 |  | $ 10.875 | $ 21.75 | $ 21.75 |  |  |  |  |  |  |  |
Dominion Energy | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend per share |  |  |  |  |  |  |  | $ 21.646 |  |  |  |  |  |  |  |  |  |
Dominion Energy | Senior Notes Due In February 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recorded interest expense |  |  |  |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |
Dominion Energy | Senior Notes Due In 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity year |  |  |  |  |  |  | 2030 |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |
Debt issued amount |  |  |  |  |  |  | $ 800,000,000 |  |  |  |  |  |  |  |  |  |  |
Dominion Energy | Senior Notes Due In 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity year |  |  |  |  |  |  | 2035 |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  | 5.45% |  |  |  |  |  |  |  |  |  |  |
Debt issued amount |  |  |  |  |  |  | $ 700,000,000 |  |  |  |  |  |  |  |  |  |  |
Dominion Energy | Senior Notes Due In 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity year |  | 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  | 4.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued amount |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DESC | First Mortgage Bonds Due in 2035 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.30% |  |  |  |
Debt issued amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 450,000,000 |  |  |  |
Joint Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | $ 6,000,000,000 |  | 7,000,000,000 |  |  | $ 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 | 84,000,000 |  |  |  |  | 84,000,000 |  |  | 84,000,000 |  | $ 48,000,000 |  |  |  |  |  |  |
Letter of Credit | Credit Facility, Maturing in June 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  | $ 275,000,000 |  |  | $ 275,000,000 |  | 275,000,000 |  |  |  |  |  |  |  |
Letters of credit issued and outstanding | 89,000,000 |  |  |  |  | 89,000,000 |  |  | 89,000,000 |  | 88,000,000 |  |  |  |  |  |  |
Letter of Credit | Credit Facility Maturing In April 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | $ 3,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maturity date |  |  | Apr. 30, 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | Credit Facility Maturing In June 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | 2,000,000,000 |  |  |  |  | 2,000,000,000 |  |  | $ 2,000,000,000 |  |  |  |  |  |  |  |  |
Line of credit facility, maturity date |  |  |  |  |  |  |  |  | Jun. 30, 2026 |  |  |  |  |  |  |  |  |
Letter of Credit | Credit Facility in January 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000 |  |  |  |
Letters of credit issued and outstanding | 52,000,000 |  |  |  |  | 52,000,000 |  |  | $ 52,000,000 |  |  |  |  |  |  |  |  |
Letter of Credit | DESC | Credit Facility, Maturing in June 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding | 89,000,000 |  |  |  |  | 89,000,000 |  |  | 89,000,000 |  | 88,000,000 |  |  |  |  |  |  |
Letter of Credit | DESC | Credit Facility in January 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |
Letter of Credit | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | 3,000,000,000 |  |  |  |  | 3,000,000,000 |  |  | 3,000,000,000 |  |  |  |  |  |  | $ 300,000,000 |  |
Line of credit issued |  |  |  |  |  |  |  |  | 159,000,000 |  | 112,000,000 |  |  |  |  |  |  |
Letter of Credit | Virginia Electric and Power Company | Credit Facility, Maturing in June 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  | $ 275,000,000 |  |  | $ 275,000,000 |  | $ 275,000,000 |  |  |  |  |  |  |  |
Letters of credit issued and outstanding | 78,000,000 |  |  |  |  | 78,000,000 |  |  | 78,000,000 |  | $ 77,000,000 |  |  |  |  |  |  |
Letter of Credit | Virginia Electric and Power Company | Credit Facility in January 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |
Letters of credit issued and outstanding | $ 50,000,000 |  |  |  |  | $ 50,000,000 |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |
Sustainability Revolving Credit Facility | Credit Facility Maturing In June 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | $ 900,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maturity date |  |  | Apr. 30, 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sustainability Revolving Credit Facility | Credit Facility Maturing In April 2028 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maturity date |  |  | Apr. 30, 2030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.

X
- Definition Debt instrument maturity year. + References No definition available. + Details
Name: | d_DebtInstrumentMaturityYear
Namespace Prefix: | d_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Definition Deemed Dividends. + References No definition available. + Details
Name: | d_DeemedDividends
Namespace Prefix: | d_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Letters of credit issued and outstanding amount. + References No definition available. + Details
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