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Property, Plant and Equipment (Narrative) (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) MW | Sep. 30, 2019 USD ($)
Property Plant And Equipment [Line Items] |  |  |  |  |
Impairment of assets and other charges |  | $ 1,151 | $ 85 | $ 1,963 | $ 1,219
Dominion Energy |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Impairment of assets and other charges |  | 665 |  | 665 |
Asset impairment charges after tax |  | 293 |  | 293 |
Impairment of assets and other charges attributable to noncontrolling interest |  | 267 |  | 267 |
Property, plant and equipment down to estimated fair value |  |  |  | 1,400 |
Wexpro | Natural Gas Gathering Systems | Colorado, Utah and Wyoming |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Payments to acquire existing natural gas gathering systems | $ 38 |  |  |  |
Acquisition of Solar Project at Schools in Virginia |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |
Anticipated projected cost |  | $ 41 |  | $ 41 |
Aggregate generation capacity | MW |  |  |  | 20 |

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