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Property, Plant and Equipment (Narrative) (Detail) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) MW | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Aug. 31, 2021 USD ($)
Property Plant And Equipment [Line Items] |  |  |  |  |
Impairment of assets and other charges |  | $ 2,062 | $ 194 | $ 2,104 |
Dominion Energy |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Impairment of assets and other charges |  | 1,500 |  | 665 |
Asset impairment charges after tax |  | 1,100 |  | 293 |
Property, plant and equipment, intangible assets and right-of-use lease assets down to estimated fair value |  | 665 |  |  |
Impairment of assets and other charges attributable to noncontrolling interest |  |  |  | 267 |
Property, plant and equipment down to estimated fair value |  |  |  | $ 1,400 |
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 |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] | Gain Loss On Disposition Of Assets |  |  |  |
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 |  |  |  |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] | Gain Loss On Disposition Of Assets |  |  |  |
Gain (loss) on held for sale, after tax | $ 176 |  |  |  |
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 |  | $ 39 |  |  |
Aggregate generation capacity | MW |  | 17 |  |  |
Project cost |  | $ 48 |  |  |
Aggregate generation capacity of service solar facilities | MW |  | 23 |  |  |
Utility Property |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Sale of utility property |  | $ 20 |  |  |
Gain on sale of asset |  | 20 |  |  |
Gain on sale of asset after tax |  | $ 15 |  |  |

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