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Variable Interest Entities - (Narrative) (Detail) - Virginia Electric and Power Company - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Variable Interest Entity [Line Items] |  |  |  |
Payables to affiliates | $ 203 |  | $ 255 | [1]
Variable Interest Entity, Not Primary Beneficiary | DES |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Shared Services Purchased | 113 | $ 98 |  |
Payables to affiliates | $ 28 |  | $ 28 |
[1] | 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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