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Significant Financing Transactions (Narrative) (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 7 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2025 | Feb. 28, 2025 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Dec. 31, 2024 | Jan. 31, 2025 | Jun. 30, 2024 | Mar. 31, 2023 | Nov. 30, 2020 | Nov. 30, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | [1] |  |  | $ 6,000,000,000 |  | $ 6,000,000,000 |  |  |  |  |  |  |
Short-term debt |  |  |  | 2,084,000,000 |  | $ 2,084,000,000 | $ 2,500,000,000 | [2] |  |  |  |  |
Line of credit issued |  |  |  | $ 0 | $ 3,000,000,000 |  |  |  |  |  |  |  |
Preferred stock shares authorized |  |  |  | 20,000,000 |  | 20,000,000 |  |  |  |  |  |  |
Dividend stock |  |  |  | $ 11,000,000 | 20,000,000 |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  | 0 |  | $ 0 | 0 |  |  |  |  |  |
Issuance of common stock |  |  |  | $ 35,000,000 | $ 31,000,000 |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maturity date |  | Apr. 30, 2026 |  |  |  |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, shares |  |  |  | 0 |  |  |  |  |  |  |  |  |
Issuance of stock (in shares) |  |  |  | 1,000,000 | 0 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Dividends per share |  |  |  |  | $ 11.625 |  |  |  |  |  |  |  |
Various Programs |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock |  |  |  | $ 35,000,000 | $ 31,000,000 |  |  |  |  |  |  |  |
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 |  |  |  | $ 55.34 |  |  |  |  |  |  |  |  |
Forward sale agreements, number of shares of common stock to be settled |  |  |  | 8,800,000 |  | 8,800,000 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Floating Rate Demand Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  | $ 446,000,000 |  | $ 446,000,000 | 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 |  |  |  | 500,000,000 |  | 500,000,000 |  |  |  |  |  |  |
Short-term indebtedness outstanding |  |  |  | 1,800,000,000 |  |  |  |  |  |  |  |  |
DESC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |
GENCO |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term indebtedness outstanding |  |  |  | 300,000,000 |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  | 6,000,000,000 |  | 6,000,000,000 |  |  |  |  |  |  |
Short-term debt |  |  |  | $ 244,000,000 |  | $ 244,000,000 | $ 950,000,000 | [3] |  |  |  |  |
Issuance of stock (in shares) |  |  |  | 0 | 0 |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  | 3,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company | Senior Notes Due In 2035 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity year |  |  |  | 2035 |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 5.15% |  | 5.15% |  |  |  |  |  |  |
Debt issued amount |  |  |  | $ 625,000,000 |  | $ 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% |  | 5.65% |  |  |  |  |  |  |
Debt issued amount |  |  |  | $ 625,000,000 |  | $ 625,000,000 |  |  |  |  |  |  |
Dominion Energy | Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock shares outstanding |  |  |  | 1,000,000 |  | 1,000,000 | 1,000,000 |  |  |  |  |  |
Dividend stock |  |  |  | $ 11,000,000 | $ 11,000,000 |  |  |  |  |  |  |  |
Preferred stock dividend per share |  |  |  | $ 10.875 | $ 10.875 |  |  |  |  |  |  |  |
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% |  | 5.00% |  |  |  |  |  |  |
Debt issued amount |  |  |  | $ 800,000,000 |  | $ 800,000,000 |  |  |  |  |  |  |
Dominion Energy | Senior Notes Due In 2035 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity year |  |  |  | 2035 |  |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 5.45% |  | 5.45% |  |  |  |  |  |  |
Debt issued amount |  |  |  | $ 700,000,000 |  | $ 700,000,000 |  |  |  |  |  |  |
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 |  | 6,000,000,000 |  |  |  |  |  |  |
Joint Revolving Credit Facility | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  | 7,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |
Letters of credit issued and outstanding |  |  |  | 44,000,000 |  | 44,000,000 | $ 48,000,000 |  |  |  |  |  |
Letter of Credit | Credit Facility, Maturing in June 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  | $ 275,000,000 |  |  |
Letters of credit issued and outstanding |  |  |  | 89,000,000 |  | 89,000,000 | 88,000,000 |  |  |  |  |  |
Letter of Credit | Credit Facility Maturing In April 2030 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Letter of Credit | Credit Facility Through March 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  |  | 50,000,000 |  | 50,000,000 |  |  |  |  |  |  |
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 | 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 |  |  |  |  | $ 300,000,000 |  |
Line of credit issued |  |  |  | 161,000,000 |  |  | 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 |  |  |
Letters of credit issued and outstanding |  |  |  | 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 |  |  |  |  |  |  |
Line of Credit Sub-limit [Member] | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  | $ 1,750,000,000 |  | $ 1,750,000,000 |  |  |  |  |  |  |
Sustainability Revolving Credit Facility | Credit Facility Maturing In June 2025 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
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 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maturity date |  | Apr. 30, 2030 |  |  |  |  |  |  |  |  |  |  |
[1] | This credit facility, as amended in April 2025, matures in April 2030, with the potential to be extended by the borrowers to April 2032, 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 $3.0 billion of letters of credit
[2] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | Virginia Power’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.

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