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Short-Term Debt and Credit Agreements (Narrative) (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2025 | May 31, 2024 | Mar. 31, 2024 | Oct. 31, 2023 | Sep. 30, 2023 | Jul. 31, 2023 | Mar. 31, 2023 | Jan. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Feb. 27, 2025 | Jun. 30, 2024 | Feb. 28, 2023 | Feb. 27, 2023 | Nov. 30, 2022 | Oct. 31, 2020 | Nov. 30, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  | $ 600,000,000 |  |  | $ 6,000,000,000 | [1],[2] | $ 6,000,000,000 | [2] |  |  |  |  |  |  |  |
Line of credit issued |  |  |  |  |  |  |  |  |  | 3,000,000,000 |  | 5,725,000,000 |  | $ 0 |  |  |  |  |  |  |
Securities due within one year | [3] |  |  |  |  |  |  |  |  | 1,725,000,000 |  | 6,589,000,000 |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  |  |  |  |  | $ 2,500,000,000 |  | $ 3,956,000,000 |  |  |  |  |  |  |  |  |
Weighted-average percentage interest rates |  |  |  |  |  |  |  |  |  | 4.74% |  | 5.69% |  |  |  |  |  |  |  |  |
Floating Rate Demand Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  |  |  |  |  | $ 439,000,000 |  | $ 409,000,000 |  |  |  |  |  |  |  |  |
Weighted-average percentage interest rates |  |  |  |  |  |  |  |  |  | 0.50% |  | 5.50% |  |  |  |  |  |  |  |  |
Floating Rate Demand Notes | Shelf Registration for Sale of Demand Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000,000
Debt instrument, maximum principal outstanding amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000,000 |
Dominion Energy South Carolina Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |
Short-term indebtedness outstanding |  |  |  |  |  |  |  | $ 2,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, maturity month and year |  |  |  |  |  |  |  | 2025-03 |  |  |  |  |  |  |  |  |  |  |  |  |
Dominion Energy South Carolina Inc | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term indebtedness outstanding |  | $ 1,800,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GENCO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term indebtedness outstanding |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, maturity month and year |  |  |  |  |  |  |  | 2025-03 |  |  |  |  |  |  |  |  |  |  |  |  |
GENCO | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term indebtedness outstanding |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit | [5] |  |  |  |  |  |  |  |  | 6,000,000,000 | [4] | $ 6,000,000,000 |  |  |  |  |  |  |  |  |
Securities due within one year | [6] |  |  |  |  |  |  |  |  | 548,000,000 |  | 381,000,000 |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  |  |  |  |  |  | $ 950,000,000 |  | $ 455,000,000 |  |  |  |  |  |  |  |  |
Weighted-average percentage interest rates |  |  |  |  |  |  |  |  |  | 4.73% |  | 5.65% |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  | $ 6,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000,000 |  |
Credit facility, maturity date |  |  |  |  |  |  |  |  |  | Dec. 31, 2027 |  |  |  |  |  |  |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit issued |  |  |  |  |  |  |  |  |  | $ 112,000,000 |  | $ 124,000,000 |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  |  |  |  |  |  |  |  | 48,000,000 |  | 54,000,000 |  |  |  |  |  |  |  |  |
Letter of Credit | Credit Facility, Maturing in June 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  |  |  |  |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |  |  |
Letter of Credit | Credit Facility Maturing In June 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  | $ 30,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  |  |  |  |  |  |  | Jun. 30, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | Credit Facility in June 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 275,000,000 |  |  |  |  |
Letters of credit issued and outstanding |  |  |  |  |  |  |  |  |  | 88,000,000 |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | Credit Facility in January 2025 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | Credit Facility Through February 2025 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |
Letter of Credit | Dominion Energy South Carolina Inc | Credit Facility in June 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  |  |  |  |  |  |  |  | 88,000,000 |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | Dominion Energy South Carolina Inc | Credit Facility in January 2025 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  | $ 300,000,000 |  | 2,000,000,000 |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |
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 Maturing In June 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  |  |  |  |  |  |  |  | 77,000,000 |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | Virginia Electric and Power Company | Credit Facility, Maturing in January 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  |  |  | $ 125,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  |  |  |  |  |  |  |  | Jan. 31, 2026 |  |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | Virginia Electric and Power Company | Credit Facility in June 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  |  |  |  |  |  |  |  | $ 77,000,000 |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | Virginia Electric and Power Company | Credit Facility in January 2025 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letter of Credit | Virginia Electric and Power Company | Credit Facility Entered in January 2025-Through February 2025 | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit issued and outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |
364 Term loan facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  | $ 500,000,000 |  |  |  | $ 2,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  |  |  | $ 225,000,000 | 750,000,000 | 1,000,000,000 | $ 1,000,000,000 |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |
Securities due within one year |  |  |  |  |  |  |  |  |  |  |  | 2,500,000,000 |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  |  |  |  |  |  |  |  | Jan. 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Repayments of borrowings |  |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility remaining borrowing and terminated |  |  |  |  | 225,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
364 Term loan facility | Term Loan Facility, Maturing in July 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  |  |  |  |  |  | Jul. 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of borrowings |  |  |  | $ 2,500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
364 Term loan facility | Term Loan Facility, Maturing in Oct 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Facility Limit |  |  |  |  | $ 2,250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit issued |  |  |  | 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities due within one year |  |  |  |  |  |  |  |  |  |  |  | $ 2,250,000,000 |  |  |  |  |  |  |  |  |
Credit facility, maturity date |  |  |  |  | Oct. 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of borrowings |  |  | $ 976,000,000 | 1,800,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
364 Term loan facility | General Corporate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, outstanding amount |  |  |  |  |  |  |  | $ 750,000,000 | $ 1,000,000,000 |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |
364 Term loan facility | General Corporate | Term Loan Facility, Maturing in Oct 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit issued |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[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] | See Note 16 for amounts attributable to VIEs.
[4] | In May 2024, the joint revolving credit facility was amended to remove Questar Gas as a co-borrower
[5] | 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 December 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.
[6] | See Note 16 for amounts attributable to VIEs.

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