Asset Impairment Charges After Tax

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Capacity of facility of company owned solar distribution generation facilities.

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Number of facilities in cold reserve units retired.

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[Line Items] for Significant Accounting Policies [Table]

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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.

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

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Indicates (true false) whether lessee has option to extend operating lease.

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Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability.

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Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

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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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Amount of lessee's right to use underlying asset under operating lease.

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Significant Accounting Policies (Narrative) (Detail) $ in Millions	1 Months Ended		3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) Facility	Jan. 31, 2019 USD ($) MW	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018	Jan. 01, 2019 USD ($)
Significant Accounting Policies [Line Items]
Asset impairment charges			$ 835	$ 1
Option to extend, description, operating lease			Certain of the Companies’ leases include one or more options to renew, with renewal terms that can extend the lease from one to 70 years.
Option to extend, existence, operating lease			true
Estimated useful life of finite-lived intangible asset			30 years
Operating lease assets	$ 486		$ 486			$ 504
Minimum
Significant Accounting Policies [Line Items]
Lease renewal term, operating lease	1 year		1 year
Maximum [Member]
Significant Accounting Policies [Line Items]
Lease renewal term, operating lease	70 years		70 years
Virginia Electric and Power Company
Significant Accounting Policies [Line Items]
Asset impairment charges			$ 546
MW Capacity \| MW		1,292
Number of facilities in cold reserve units retired \| Facility	6
Operating lease assets	$ 202		202			209
Virginia Electric and Power Company \| Impairment of Assets and Other Charges
Significant Accounting Policies [Line Items]
Asset impairment charges	369	$ 160
Asset impairment charges after tax	275	$ 119
Dominion Energy Gas Holdings, LLC
Significant Accounting Policies [Line Items]
Operating lease assets	$ 63		$ 63			$ 64
Dominion Energy Midstream Partners, LP \| Common and Subordinated Units
Significant Accounting Policies [Line Items]
Ownership interest percentage of limited partner interests					60.90%
Dominion Energy Midstream Partners, LP \| Convertible Preferred Units
Significant Accounting Policies [Line Items]
Ownership interest percentage of limited partner interests					37.50%
Merchant Solar Projects \| Terra Nova Renewable Partners
Significant Accounting Policies [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	50.00%		50.00%
Percentage of equity interest sold to noncontrolling interest owners	33.00%		33.00%
Merchant Solar Projects \| Terra Nova Renewable Partners \| Call Option
Significant Accounting Policies [Line Items]
Percentage ownership in total units	67.00%		67.00%