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Property Plant and Equipment (Narrative) (Detail) $ in Millions	1 Months Ended										3 Months Ended					9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($)	Aug. 31, 2018 project	Jun. 30, 2018 USD ($) a field	Mar. 31, 2018 USD ($) a field	Feb. 28, 2018 USD ($)	Jan. 31, 2018 a	Dec. 31, 2017 USD ($)	Sep. 30, 2017 project	Aug. 31, 2017 USD ($) a	Jul. 31, 2017 USD ($) a	Mar. 31, 2019 USD ($) MW	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2020 USD ($) MW	Dec. 31, 2019 USD ($) MW	Dec. 31, 2013 USD ($) a	Oct. 31, 2018 USD ($)	Oct. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)	Nov. 30, 2014 a field
Property, Plant and Equipment [Line Items]
Cost of project																$ 108	$ 343
Virginia Electric and Power Company
Property, Plant and Equipment [Line Items]
Cost of project																98	16
Virginia Electric and Power Company | Two Solar Development Projects
Property, Plant and Equipment [Line Items]
Number of projects | project		2						2
Dominion Energy Gas Holdings, LLC | Utica and Point Pleasant Shale | Oil and Gas Properties
Property, Plant and Equipment [Line Items]
Amount of consideration				$ 16
Development rights (number of acres) | a				11,000
Number of natural gas storage fields | field				1
Proceeds from assignment of Shale Development Rights				$ 16
Dominion Energy Gas Holdings, LLC | Utica and Point Pleasant Shale | Oil and Gas Properties | Other operations and maintenance
Property, Plant and Equipment [Line Items]
Gain on sale				16
After tax gain on sale				$ 12
Dominion Energy Gas Holdings, LLC | Marcellus Shale | Oil and Gas Properties
Property, Plant and Equipment [Line Items]
Amount of consideration			$ 6		$ 28					$ 5
Development rights (number of acres) | a			9,000			18,000				2,000										100,000				24,000
Period for payments related to conveyance of natural gas storage fields																				9 years
Gas and oil area developed net remaining interest conveyed percentage						50.00%
Number of natural gas storage fields | field			1																					1
Dominion Energy Gas Holdings, LLC | Marcellus Shale | Oil and Gas Properties | Amended Agreement To Extend Conveyance Of Development Rights
Property, Plant and Equipment [Line Items]
Gain on sale														$ 9	$ 56
After tax gain on sale														5	33
Development rights (number of acres) | a									70,000
Gas and oil area developed net remaining interest conveyed percentage									68.00%
Total consideration	$ 65								$ 130					65
Dominion Energy Gas Holdings, LLC | Marcellus Shale | Oil and Gas Properties | Amended Agreement To Extend Conveyance Of Development Rights | Final Conveyance
Property, Plant and Equipment [Line Items]
Gain on sale	65
After tax gain on sale	47
Dominion Energy Gas Holdings, LLC | Marcellus Shale | Oil and Gas Properties | Other operations and maintenance
Property, Plant and Equipment [Line Items]
Gain on sale			$ 6		28					$ 5
After tax gain on sale			$ 4		$ 20					$ 3
Maximum | Dominion Energy Gas Holdings, LLC | Marcellus Shale | Oil and Gas Properties
Property, Plant and Equipment [Line Items]
Amount of consideration																				$ 200
Scenario, Forecast | Virginia Electric and Power Company
Property, Plant and Equipment [Line Items]
Cost of project											$ 37
MW capacity | MW											20
Scenario, Forecast | Virginia Electric and Power Company | Two Solar Development Projects
Property, Plant and Equipment [Line Items]
MW capacity | MW																		155	155
Scenario, Forecast | Virginia Electric and Power Company | First Solar Development Project
Property, Plant and Equipment [Line Items]
Cost of project												$ 140							$ 120
Scenario, Forecast | Virginia Electric and Power Company | Second Solar Development Project
Property, Plant and Equipment [Line Items]
Cost of project																		$ 130	$ 140
Retail Energy Marketing Assets | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Property, Plant and Equipment [Line Items]
Amount of consideration																						$ 143
Contractual term of agreement to use brand							10 years
Retail Energy Marketing Assets | Disposal Group, Disposed of by Sale, Not Discontinued Operations | First Phase of Agreements to Sell Certain Assets
Property, Plant and Equipment [Line Items]
Amount of consideration							$ 79							$ 79
Retail Energy Marketing Assets | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Scenario, Forecast
Property, Plant and Equipment [Line Items]
Gain on sale												65
After tax gain on sale												49
Fairless and Manchester
Property, Plant and Equipment [Line Items]
Amount of consideration	1,200												$ 1,200			1,200
Fairless and Manchester | Maximum
Property, Plant and Equipment [Line Items]
Sale of equity method investments, estimated decrease in tax expenses upon usage of tax incentives																50
Fairless and Manchester | Scenario, Forecast
Property, Plant and Equipment [Line Items]
Gain on sale of equity method investment												210
Gain on sale of equity method investments, net of tax												$ 150
Assignment of Tower Rental Portfolio | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Virginia Electric and Power Company
Property, Plant and Equipment [Line Items]
Amount of consideration																							$ 91
Amount recognized in operating revenue and other income from sale													2		$ 2	5	$ 10
Amount to be recognized in other income ratably through 2023	$ 30												$ 30			$ 30
Subsequent Event | Retail Energy Marketing Assets | Disposal Group, Disposed of by Sale, Not Discontinued Operations | Second Phase of Agreements to Sell Certain Assets
Property, Plant and Equipment [Line Items]
Amount of consideration																					$ 63

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