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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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Variable Interest Entity [Line Items]
Payables to affiliates	$ 97		$ 97		$ 255	[1]
Variable Interest Entity, Not Primary Beneficiary | DES
Variable Interest Entity [Line Items]
Shared Services Purchased	113	$ 96	226	$ 194
Payables to affiliates	$ 27		$ 27		$ 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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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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