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Variable Interest Entities - (Narrative) (Detail) - Virginia Electric and Power Company - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Variable Interest Entity [Line Items] |  |  |  |  |  |
Payables to affiliates | $ 225 |  | $ 225 |  | $ 121 | [1]
Variable Interest Entity, Not Primary Beneficiary | DES |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |
Shared Services Purchased | 96 | $ 93 | 194 | $ 189 |  |
Payables to affiliates | $ 64 |  | $ 64 |  | $ 20 |
[1] | Virginia Power’s Consolidated Balance Sheet at December 31, 2021 has been derived from the audited Consolidated Balance Sheet at that date.

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