Asset Impairment Charges After Tax

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- Definition

[Line Items] for Significant Accounting Policies [Table]

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Significant Accounting Policies (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Significant Accounting Policies [Line Items]
Impairment of assets and other charges	$ 95		$ 768
Virginia Electric and Power Company \| Impairment of Assets and Other Charges
Significant Accounting Policies [Line Items]
Impairment of assets and other charges	76	$ 127	754
Asset impairment charges after tax	$ 56		$ 561
Dominion Energy Midstream Partners, LP \| Terra Nova Renewable Partners \| Nonregulated Solar Projects \| Call Option
Significant Accounting Policies [Line Items]
Percentage ownership in total units	67.00%
Cove Point \| Brookfield
Significant Accounting Policies [Line Items]
Percentage of equity interest sold to noncontrolling interest owners	25.00%
Four Brothers and Three Cedars
Significant Accounting Policies [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	50.00%
Four Brothers and Three Cedars \| Dominion Energy Midstream Partners, LP \| Terra Nova Renewable Partners \| Nonregulated Solar Projects
Significant Accounting Policies [Line Items]
Percentage of equity interest sold to noncontrolling interest owners	33.00%