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Variable Interest Entities - (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Payable to affiliates | [1] | $ 1,655 |  | $ 1,655 |  | $ 1,697 | [2]
Virginia Electric and Power Company |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Payable to affiliates |  | 1,213 |  | 1,213 |  | 1,176 | [3]
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DES |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Shared Services Purchased |  | 113 | $ 96 | 339 | $ 290 |  |
Variable Interest Entity, Not Primary Beneficiary | Virginia Electric and Power Company | DES | Related Party |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Payable to affiliates |  | $ 29 |  | $ 29 |  | $ 28 |
Variable Interest Entity, Not Primary Beneficiary | Cove Point |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Percentage of variable interest sold |  | 50.00% |  | 50.00% |  |  |
[1] | See Note 10 for amounts attributable to related parties.
[2] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date and recast for certain events as discussed in Note 1.
[3] | Virginia Power’s Consolidated Balance Sheet at December 31, 2022 has been derived from the audited Consolidated Balance Sheet at that date.

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