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Acquisitions and Dispositions (Sale of Kewaunee) (Narrative) (Detail) - Dominion Energy Kewaunee, Inc - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	May 31, 2021
Business Acquisition And Dispositions [Line Items]
Percentage of equity interests expected to be sold		100.00%
Disposal group, expected to recognized a loss	$ 725
Disposal group, expected to recognized a loss after tax	$ 570

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- Definition

Business acquisition and dispositions line items.

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- Definition

Disposal group including discontinued operation gain (loss) on disposal.

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- Definition

Disposal group including discontinued operation gain (loss) on disposal after tax.

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- Definition

Percentage of equity interests expected to be sold.

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