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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Income Taxes [Line Items] |  |  |  |
Income Tax Expense (Benefit) | $ (117) | $ (47) | $ 119 | $ 165
Income tax expense (benefit) from discontinued operations | $ (2) | 4 | 4 | 11
Continuing Operations |  |  |  |
Income Taxes [Line Items] |  |  |  |
Deferred income tax expense (benefit) |  |  | $ (21) |
Hope Gas Inc |  |  |  |
Income Taxes [Line Items] |  |  |  |
Percentage of equity interests expected to be sold | 100.00% |  | 100.00% |
Income Tax Expense (Benefit) |  |  | $ 90 |
Virginia Electric and Power Company |  |  |  |
Income Taxes [Line Items] |  |  |  |
Income Tax Expense (Benefit) |  | $ 69 | 61 | $ 139
Virginia Electric and Power Company | Continuing Operations |  |  |  |
Income Taxes [Line Items] |  |  |  |
Deferred income tax expense (benefit) |  |  | $ (16) |

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