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Significant Accounting Policies (Narrative) (Detail) $ / shares in Units, $ in Millions	1 Months Ended				3 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($)	May 31, 2019 USD ($)	Mar. 31, 2019 USD ($) Facility MW	Jan. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) MWh	Dec. 31, 2019 USD ($) MWh		Dec. 31, 2018 USD ($) MWh $ / shares	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)
Significant Accounting Policies [Line Items]
Accrued unbilled revenue					$ 626	$ 896		$ 626
Percentage of fuel currently subject to deferred fuel accounting						84.00%
Federal statutory income tax rate						21.00%		21.00%	35.00%
Recognized interest income									$ 11
Margin deposit assets					$ 95	$ 42		$ 95
Margin liabilities						2
Capitalized interest costs and Capitalized interest costs and AFUDC						89		134	236
Impairment of assets and other charges						$ 1,535		$ 403	15
Estimated proved developed or proved gas and oil reserves rate per unit | MWh					1.89	1.80		1.89
Unrealized gains reclassified from AOCI to retained earnings					$ 1,100			$ 1,100
Unrealized gains reclassified from AOCI to retained earnings after-tax								734
Net unrealized gains on equity securities previously classified as cost method investments					36			36
Net unrealized gains on equity securities previously classified as cost method investments, after tax								22
Net unrealized losses in other income								190
Net unrealized losses in other income, after tax								$ 142
Gain per share from unrealized loss on securities | $ / shares								$ 0.22
Operating lease assets						$ 499	[1]			$ 504
Operating lease liabilities						$ 478
Tax reform, reclassification of tax benefit from AOCI to retained earnings								$ 289
Finite Lived Intangible Asset Useful Life						30 years
Accounting Standards Update 2014-09 [Member] | Cumulative Effect Of Changes In Accounting Principle [Member]
Significant Accounting Policies [Line Items]
Change in accounting principle to retained earnings and membership interests					3			3
Accounting Standards Update 2017-05 [Member] | Cumulative Effect Of Changes In Accounting Principle [Member]
Significant Accounting Policies [Line Items]
Change in accounting principle to retained earnings and membership interests						$ 127
Current Regulatory Liabilities [Member]
Significant Accounting Policies [Line Items]
Net unrealized gains on equity securities previously classified as cost method investments						33
Retained Earnings
Significant Accounting Policies [Line Items]
Net unrealized gains on equity securities previously classified as cost method investments						$ 3
Maximum [Member]
Significant Accounting Policies [Line Items]
Margin liabilities					1			$ 1
Lessee Operating Lease Renewal Term						70 years
Maximum [Member] | Nonutility Gas Gathering and Processing
Significant Accounting Policies [Line Items]
Estimated useful lives						50 years
Minimum [Member]
Significant Accounting Policies [Line Items]
Lessee Operating Lease Renewal Term						1 year
Minimum [Member] | Nonutility Gas Gathering and Processing
Significant Accounting Policies [Line Items]
Estimated useful lives						3 years
Change in Depreciation Rates from New Depreciation Study
Significant Accounting Policies [Line Items]
Increase (decrease) in EPS | $ / shares								$ 0.07
Change in Estimated Useful Life [Member] | Merchant generation assets
Significant Accounting Policies [Line Items]
Increase (decrease) in depreciation expense								$ (30)	26
Increase (decrease) in depreciation expense, after tax								(23)	16
Performing Processing And Fractionation Services [Member] | Accounting Standards Update 2014-09 [Member]
Significant Accounting Policies [Line Items]
Other energy-related purchases								107
Transportation And Storage Arrangements [Member] | Accounting Standards Update 2014-09 [Member]
Significant Accounting Policies [Line Items]
Purchased gas									$ 111
Virginia Electric and Power Company
Significant Accounting Policies [Line Items]
Accrued unbilled revenue					392	$ 512		$ 392
Federal statutory income tax rate						21.00%		21.00%	35.00%
Recognized interest income									$ 11
Margin deposit assets					0			$ 0
Margin liabilities					0	$ 0		0
Capitalized interest costs and Capitalized interest costs and AFUDC						34		56	37
AFUCD recorded as regulatory asset					4	11		4	22
Impairment of assets and other charges				$ 160		757
Asset Impairment Charges After Tax				$ 119
Unrealized gains reclassified from AOCI to retained earnings					119			119
Unrealized gains reclassified from AOCI to retained earnings after-tax								73
Net unrealized losses in other income								24
Net unrealized losses in other income, after tax								18
Operating lease assets						212	[1]			209
Operating lease liabilities						187
Tax reform, reclassification of tax benefit from AOCI to retained earnings								3
MW capacity | MW			1,292
Number Of Facilities In Cold Reserve Units Retired | Facility			6
Virginia Electric and Power Company | Affiliated Entity
Significant Accounting Policies [Line Items]
Income tax payable					36	35		36
Virginia Electric and Power Company | Impairment Of Assets And Other Charges [Member]
Significant Accounting Policies [Line Items]
Impairment of assets and other charges	$ 17	$ 62	$ 346
Asset Impairment Charges After Tax	12	$ 46	$ 257
Virginia Electric and Power Company | Maximum [Member]
Significant Accounting Policies [Line Items]
Margin deposit assets						1
Virginia Electric and Power Company | Change in Depreciation Rates from New Depreciation Study
Significant Accounting Policies [Line Items]
Increase (decrease) in depreciation expense								60	(40)
Increase (decrease) in depreciation expense, after tax								(44)	$ 25
Virginia Electric and Power Company | Federal | Affiliated Entity
Significant Accounting Policies [Line Items]
Income tax payable					34	15		34
Virginia Electric and Power Company | State | Affiliated Entity
Significant Accounting Policies [Line Items]
Income tax payable					2	20		2
Dominion Energy Gas Holdings, LLC
Significant Accounting Policies [Line Items]
Accrued unbilled revenue					101	$ 104		$ 101
Federal statutory income tax rate						21.00%		21.00%	35.00%
Margin deposit assets					0	$ 0		$ 0
Margin liabilities					0			0
Capitalized interest costs and Capitalized interest costs and AFUDC						31		25	$ 34
Impairment of assets and other charges					219	13		163	15
Inventory under LIFO method					12	19		12
Amount exceeded on LIFO basis					87	60		87
Operating lease assets						37	[1]			$ 64
Operating lease liabilities						35
Tax reform, reclassification of tax benefit from AOCI to retained earnings								26
Dominion Energy Gas Holdings, LLC | Affiliated Entity
Significant Accounting Policies [Line Items]
Income tax payable						$ 209
Receivable from affiliate					271			271
Dominion Energy Gas Holdings, LLC | Impairment Of Assets And Other Charges [Member]
Significant Accounting Policies [Line Items]
Impairment of assets and other charges	26
Dominion Energy Gas Holdings, LLC | Maximum [Member] | Nonutility Gas Gathering and Processing
Significant Accounting Policies [Line Items]
Estimated useful lives						40 years
Dominion Energy Gas Holdings, LLC | Transportation And Storage Arrangements [Member] | Accounting Standards Update 2014-09 [Member]
Significant Accounting Policies [Line Items]
Purchased gas									$ 71
Dominion Energy Gas Holdings, LLC | Federal
Significant Accounting Policies [Line Items]
Federal income taxes receivable					277			277
Dominion Energy Gas Holdings, LLC | Federal | Affiliated Entity
Significant Accounting Policies [Line Items]
Income tax payable					6	$ 212		6
Dominion Energy Gas Holdings, LLC | State
Significant Accounting Policies [Line Items]
Noncurrent income taxes receivable					$ 15	10		$ 15
Dominion Energy Gas Holdings, LLC | State | Affiliated Entity
Significant Accounting Policies [Line Items]
Income tax payable						3
Dominion Energy Gas Holdings, LLC | Discontinued Operations [Member]
Significant Accounting Policies [Line Items]
Operating lease assets						25
Operating lease liabilities						$ 25
Dominion Energy | Impairment Of Assets And Other Charges [Member]
Significant Accounting Policies [Line Items]
Asset Impairment Charges After Tax	$ 19
Four Brothers and Three Cedars
Significant Accounting Policies [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired						50.00%
Terra Nova Renewable Partners | Four Brothers and Three Cedars
Significant Accounting Policies [Line Items]
Percentage of equity interest sold to noncontrolling interest owners						33.00%
Dominion Energy Midstream Partners, LP
Significant Accounting Policies [Line Items]
Federal statutory income tax rate								21.00%	35.00%
Dominion Energy Midstream Partners, LP | Dominion Energy Gas Holdings, LLC
Significant Accounting Policies [Line Items]
Percentage ownership in total units						25.00%
Merchant Solar Projects | Dominion Energy Midstream Partners, LP | Call Option
Significant Accounting Policies [Line Items]
Percentage ownership in total units						67.00%
[1] Included in other deferred charges and other assets in the Companies’ Consolidated Balance Sheets.

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