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Income Taxes (Narrative) (Detail) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Income Taxes [Line Items] |  |  |  |
Income tax expense (benefit) from discontinued operations | $ 0 | $ (6,000,000) | $ 4,000,000 | $ 5,000,000
GT&S Transaction |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax expense (benefit) from discontinued operations |  | $ (18,000,000) |  |
Continuing Operations |  |  |  |
Income Taxes [Line Items] |  |  |  |
Deferred income tax expense (benefit) |  |  | (21,000,000) |
Discontinued Operations | GT&S Transaction |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income tax benefit related to finalizing income tax returns |  |  |  | $ 15,000,000
Maximum |  |  |  |
Income Taxes [Line Items] |  |  |  |
Decrease in unrecognized tax benefits | $ 26,000,000 |  | 26,000,000 |
Amount that earnings could potentially increase if changes were to occur |  |  | $ 26,000,000 |
Hope Gas Inc |  |  |  |
Income Taxes [Line Items] |  |  |  |
Percentage of equity interests sold | 100.00% |  | 100.00% |
Virginia Electric and Power Company | Continuing Operations |  |  |  |
Income Taxes [Line Items] |  |  |  |
Deferred income tax expense (benefit) |  |  | $ (16,000,000) |

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