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Property, Plant and Equipment (Narrative) (Detail) $ in Millions | 1 Months Ended | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 | Feb. 28, 2021 USD ($) MW | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Oct. 31, 2018 USD ($)
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |
Impairment of assets and other charges |  |  |  |  | $ 2,105 | $ 1,520 | $ 12 |
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 | 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 | Subsequent Event |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |
Anticipated projected cost |  |  |  | $ 61 |  |  |  |
Aggregate generation capacity | MW |  |  |  | 30 |  |  |  |
Retail Energy Marketing Operations | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |
Gain on sale |  |  |  |  |  | 65 |  |
After tax gain on sale |  |  |  |  |  | $ 49 |  |
Commission receivable term |  |  | 10 years |  |  |  |  |
Retail Energy Marketing Operations | 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
Fairless and Manchester |  |  |  |  |  |  |  |
Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |
Amount of consideration |  | $ 1,200 |  |  |  |  | $ 1,200 |
Gain on sale of equity method investment |  | 210 |  |  |  |  |  |
Gain on sale of equity method investments, net of tax |  | $ 198 |  |  |  |  |  |

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