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Number of solar development projects acquired.

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Fractional interest owned based on working interests or other economic arrangements of area spaced or assigned to productive wells.

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Property Plant and Equipment (Narrative) (Detail) $ in Millions	1 Months Ended								6 Months Ended		12 Months Ended
	Apr. 30, 2019 USD ($) MW	Jan. 31, 2019 MW	Aug. 31, 2018 project	Jun. 30, 2018 USD ($) a field	Mar. 31, 2018 USD ($) a field	Feb. 28, 2018 USD ($)	Jan. 31, 2018 a	Sep. 30, 2017 project	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($) a field	Dec. 31, 2021 USD ($) MW	Dec. 31, 2020 USD ($) MW	Dec. 31, 2019 USD ($) MW	Dec. 31, 2018 USD ($)	Nov. 30, 2014 a field
Property Plant And Equipment [Line Items]
Cost of project									$ 152	$ 51
Virginia Electric and Power Company
Property Plant And Equipment [Line Items]
Cost of project									$ 150	$ 43
MW Capacity \| MW		1,292
Virginia Electric and Power Company \| Solar Development Project in Virginia
Property Plant And Equipment [Line Items]
Cost of project	$ 37
MW Capacity \| MW	20
Virginia Electric and Power Company \| Solar Development Project in Virginia \| Scenario Forecast
Property Plant And Equipment [Line Items]
Cost of project											$ 260	$ 160
MW Capacity \| MW											150	88
Virginia Electric and Power Company \| Two Solar Development Projects \| North Carolina and Virginia
Property Plant And Equipment [Line Items]
Number of Projects \| project			2
Virginia Electric and Power Company \| Two Solar Development Projects \| North Carolina
Property Plant And Equipment [Line Items]
Number of Projects \| project								2
Virginia Electric and Power Company \| Two Solar Development Projects \| Scenario Forecast \| North Carolina and Virginia
Property Plant And Equipment [Line Items]
MW Capacity \| MW													155
Virginia Electric and Power Company \| Two Solar Development Projects \| Scenario Forecast \| North Carolina
Property Plant And Equipment [Line Items]
MW Capacity \| MW													155
Virginia Electric and Power Company \| First Solar Development Project \| North Carolina
Property Plant And Equipment [Line Items]
Cost of project														$ 140
Virginia Electric and Power Company \| First Solar Development Project \| Scenario Forecast \| North Carolina and Virginia
Property Plant And Equipment [Line Items]
Cost of project												$ 130
Virginia Electric and Power Company \| Second Solar Development Project \| Scenario Forecast \| North Carolina and Virginia
Property Plant And Equipment [Line Items]
Cost of project													$ 120
Virginia Electric and Power Company \| Second Solar Development Project \| Scenario Forecast \| North Carolina
Property Plant And Equipment [Line Items]
Cost of project													$ 140
Dominion Energy Gas Holdings, LLC \| Marcellus Shale \| Oil and Gas Properties
Property Plant And Equipment [Line Items]
Development rights (number of acres) \| a				9,000			18,000			9,000					24,000
Number of natural gas storage fields \| field				1						1					1
Gas and oil area developed net remaining interest conveyed percentage							50.00%
Amount of consideration				$ 6		$ 28				$ 6
Gain on sale				6
After tax gain on sale				$ 4
Dominion Energy Gas Holdings, LLC \| Marcellus Shale \| Other operations and maintenance \| Oil and Gas Properties
Property Plant And Equipment [Line Items]
Gain on sale						28
After tax gain on sale						$ 20
Dominion Energy Gas Holdings, LLC \| Utica and Point Pleasant Shale \| Oil and Gas Properties
Property Plant And Equipment [Line Items]
Development rights (number of acres) \| a					11,000
Number of natural gas storage fields \| field					1
Amount of consideration					$ 16
Gain on sale					16
After tax gain on sale					12
Proceeds from assignment of Shale Development Rights					$ 16