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Significant Accounting Policies (Narrative) (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 31, 2024 Station | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($)
Asset Retirement Obligations [Line Items] |  |  |  |  |  |
Impairment of assets and other charges |  | $ 122 |  | $ 1 | $ 219 | $ 136
Number of stations maintains inactive or closed units expected to be subject to final rule | Station | 19 |  |  |  |  |
Dominion Energy |  |  |  |  |  |
Asset Retirement Obligations [Line Items] |  |  |  |  |  |
Increase in asset retirement obligation |  |  | $ 1,100 |  |  |
Increase in regulatory assets |  |  | 536 |  |  |
Increase in property, plant, and equipment |  | (215) | 505 |  |  |
Virginia Electric and Power Company | Impairment of Assets and Other Charges |  |  |  |  |  |
Asset Retirement Obligations [Line Items] |  |  |  |  |  |
Impairment of assets and other charges |  | 25 |  |  |  |
Impairment of assets and other charges after tax |  | $ 18 |  |  |  |
Virginia Power |  |  |  |  |  |
Asset Retirement Obligations [Line Items] |  |  |  |  |  |
Number of stations maintains inactive or closed units expected to be subject to final rule | Station | 12 |  |  |  |  |
Increase in asset retirement obligation |  |  | 420 |  |  |
Increase in regulatory assets |  |  | 234 |  |  |
Increase in property, plant, and equipment |  |  | 152 |  |  |
Increase in other deferred charges and other assets |  |  | $ 34 |  |  |

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