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Significant Accounting Policies (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2022 | Jun. 30, 2021 | Sep. 30, 2022 | Dec. 31, 2022
Other Operations and Maintenance |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Asset retirement obligation, liabilities incurred |  | $ 44 |  |
Asset retirement obligation, liabilities incurred after tax |  | $ 35 |  |
Change in Depreciation Rates from New Depreciation Study |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Increase in EPS | $ 0.01 |  | $ 0.04 |
Change in Depreciation Rates from New Depreciation Study | Forecast |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Increase in EPS |  |  |  | $ 0.05
Virginia Electric and Power Company | Coal And Oil Fired Generating Units |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Charges recorded with dismantling | $ 18 |  | $ 60 |
Charges recorded with dismantling after tax | 14 |  | 45 |
Virginia Electric and Power Company | Change in Depreciation Rates from New Depreciation Study |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Increase (decrease) in depreciation expense | (15) |  | (45) |
Increase (decrease) in depreciation expense, after tax | $ (11) |  | $ (33) |
Virginia Electric and Power Company | Change in Depreciation Rates from New Depreciation Study | Forecast |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Increase (decrease) in depreciation expense |  |  |  | $ (60)
Increase (decrease) in depreciation expense, after tax |  |  |  | $ (45)
Four Brothers And Three Cedars | Dominion Energy Midstream Partners, LP | Terra Nova Renewable Partners | Nonregulated Solar Projects |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of equity interest sold to noncontrolling interest owners | 33.00% |  | 33.00% |

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