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Related-Party Transactions (Narrative) (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Nov. 30, 2022 | Jun. 30, 2021
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Revolving credit facility maximum borrowing capacity | [1] |  | $ 6,000,000,000 | $ 6,000,000,000 |  |  |
Borrowing Interest Charges |  |  | 15,000,000 | 1,000,000 | $ 1,000,000 |  |
Revolving Credit Facility |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Revolving credit facility maximum borrowing capacity |  |  |  |  |  |  | $ 6,000,000,000.0
Virginia Electric and Power Company |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Revolving credit facility maximum borrowing capacity | [2] |  | 6,000,000,000 | 6,000,000,000 |  |  |
Payable to affiliates |  |  | 2,024,000,000 | 699,000,000 |  |  |
Outstanding borrowings, net of repayments, under money pool for non-regulated subsidiaries |  |  | $ 0 | $ 0 |  |  |
Issuance of common stock (in shares) |  |  | 0 | 0 | 0 |  |
Virginia Electric and Power Company | Subsequent Event |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Commencing Period |  | 20 months |  |  |  |  |
Lease commencement term |  | 2025-08 |  |  |  |  |
Related party transaction costs |  | $ 240,000,000 |  |  |  |  |
Virginia Electric and Power Company | Pension Benefits | Amounts Associated With Dominion Pension Plan |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Amounts due to Dominion, noncurrent |  |  | $ 422,000,000 | $ 522,000,000 |  |  |
Virginia Electric and Power Company | Medical Coverage for Local retirees | Amounts Associated with the Dominion Retiree Health and Welfare Plan |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Amounts due from Dominion, noncurrent |  |  | 518,000,000 | 431,000,000 |  |  |
Virginia Electric and Power Company | Affiliated Entity |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Derivative assets |  |  | 33,000,000 | 29,000,000 |  |  |
Derivative liabilities |  |  | 31,000,000 | 6,000,000 |  |  |
Virginia Electric and Power Company | Principal Owner | Short-Term Borrowing Arrangements |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Payable to affiliates |  |  | $ 2,000,000,000.0 | $ 699,000,000 |  |  |
Weighted- average interest rate percentage |  |  | 4.68% | 0.26% |  |  |
Virginia Electric and Power Company | Revolving Credit Facility |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Revolving credit facility maximum borrowing capacity |  |  |  |  |  | $ 3,000,000,000.0 |
[1] | 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.
[2] | The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Questar Gas 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, 2022, 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.

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