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Property, Plant and Equipment (Narrative) (Detail) $ in Millions	1 Months Ended			12 Months Ended
	Nov. 30, 2021 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 MW	Dec. 31, 2021 USD ($) MW	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Aug. 31, 2021 USD ($)
Property Plant And Equipment [Line Items]
Property, plant and equipment				$ 59,774	$ 57,848
Impairment of assets and other charges				$ 195	2,105	$ 1,520
Dominion Energy
Property Plant And Equipment [Line Items]
Impairment of assets and other charges					665
Asset impairment charges after tax					293
Impairment of assets and other charges attributable to noncontrolling interest					267
Property, plant and equipment down to estimated fair value					1,400
Wexpro | Natural Gas Gathering Systems
Property Plant And Equipment [Line Items]
Payments to acquire existing natural gas gathering systems	$ 41
Wexpro | Natural Gas Gathering Systems | Colorado, Utah and Wyoming
Property Plant And Equipment [Line Items]
Payments to acquire existing natural gas gathering systems		$ 38
Terra Nova Renewable Partners | Nonregulated Solar Projects | S B L Holdco L L C
Property Plant And Equipment [Line Items]
Percentage of controlling interest				67.00%
Disposal group, total value of consideration				$ 456
Gain (loss) on held for sale				19
Gain (loss) on held for sale, after tax				15
Clearway Energy Inc | Four Brothers And Three Cedars
Property Plant And Equipment [Line Items]
Percentage of controlling interest							50.00%
Disposal group, total value of consideration							$ 335
Gain (loss) on held for sale				229
Gain (loss) on held for sale, after tax				176
Virginia Electric and Power Company
Property Plant And Equipment [Line Items]
Aggregate generation capacity | MW			1,292
Property, plant and equipment				34,656	$ 32,569
Virginia Electric and Power Company | Virginia Regulation
Property Plant And Equipment [Line Items]
Impairment of assets and other charges				318
Acquisition of Solar Project at Schools in Virginia
Property Plant And Equipment [Line Items]
Anticipated projected cost				$ 30
Aggregate generation capacity | MW				15
Project cost				$ 34
Aggregate generation capacity of service solar facilities | MW				17

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