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Significant Financing Transactions (Commercial Paper, Bank Loans and Letters of Credit Outstanding) (Parenthetical) (Detail) - USD ($) | Sep. 30, 2025 | Jul. 31, 2025 | Jun. 30, 2025 | Apr. 30, 2025 | Mar. 31, 2023
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Line of Credit Facility [Line Items] |  |  |  |  |  |
Facility Limit |  | $ 8,000,000,000 |  |  |  |
Virginia Electric and Power Company |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Facility Limit | [1] | 7,000,000,000 |  |  |  |
Letter of Credit Matures in April 2032 |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Facility Limit |  | 3,000,000,000 |  |  |  |
Letter of Credit Matures in April 2032 | Virginia Electric and Power Company |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Facility Limit |  |  | $ 4,000,000,000 | $ 3,000,000,000 | $ 1,750,000,000 |
Letter of Credit |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Facility Limit |  |  |  |  |  | $ 100,000,000
Letter of Credit | Virginia Electric and Power Company |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Facility Limit |  |  |  |  |  | $ 300,000,000
Letter of Credit | Virginia Electric and Power Company | Maximum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Facility Limit |  | $ 3,000,000,000 |  |  |  |
[1] | 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. In April 2025, the sub-limit for Virginia Power was increased from $1.75 billion to $3.0 billion. In July 2025, the sub-limit was increased to $4.0 billion. If Virginia Power has liquidity needs in excess of its current 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 April 2030, with the potential to be extended by the borrowers to April 2032. The credit facility can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $3.0 billion (or the sub-limit, whichever is less) of letters of credit.

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