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Significant Accounting Policies (Narrative) (Detail 2) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2023 | Apr. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2024 | Dec. 31, 2022 | Dec. 31, 2023 | Jan. 31, 2022
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Finite Lived Intangible Asset Useful Life |  |  |  |  |  | 35 years |
Impairment of Assets and Other Charges |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Inventory balances wrote off |  |  | $ 40 |  |  |  |
Inventory balances wrote off, after tax |  |  | 30 |  |  |  |
Minimum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Lease extend term |  |  |  |  |  | 1 year |
Maximum |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Lease extend term |  |  |  |  |  | 70 years |
Virginia Electric and Power Company |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Finite Lived Intangible Asset Useful Life |  |  |  |  |  |  | 35 years
Virginia Electric and Power Company | Biennial Review |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Authorized return percentage | 9.35% | 9.35% |  |  |  |  |
Virginia Electric and Power Company | Triennial Review |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Authorized return percentage |  | 70.00% |  |  | 70.00% |  |
Virginia Electric and Power Company | Forecast | Biennial Review |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Authorized return percentage |  |  |  | 9.70% |  |  |
Virginia Electric and Power Company | Impairment of Assets and Other Charges |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Inventory balances wrote off |  |  | 19 |  |  |  |
Inventory balances wrote off, after tax |  |  | 14 |  |  |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Inventory under LIFO method |  |  | 14 |  | $ 14 | $ 18 |
Amount exceeded on LIFO basis |  |  | $ 129 |  | $ 129 | $ 42 |

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