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Variable Interest Entities (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Payable to affiliates | [1],[2] | $ 1,655 |  | $ 1,655 |  | $ 2,084 | [3]
Virginia Electric and Power Company |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Payable to affiliates | [4],[5] | 1,382 |  | 1,382 |  | $ 1,549 | [6]
Virginia Electric and Power Company | CVOW Commercial Project |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 50.00% |
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | DES |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Shared Services Purchased |  | 145 | $ 125 | 442 | $ 368 |  |
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company | DES | Related Party |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Payable to affiliates |  | 43 |  | 43 |  | $ 38 |
Variable Interest Entity Not Primary Beneficiary | OSWP [Member] |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Payable to affiliates |  | $ 7 |  | $ 7 |  | $ 0 |
[1] | See Note 10 for amounts attributable to related parties.
[2] | See Note 15 for amounts attributable to VIEs.
[3] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.
[4] | See Note 15 for amounts attributable to VIEs.
[5] | See Note 19 for amounts attributable to affiliates.
[6] | 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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