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v3.25.1

Property, Plant and Equipment (Narrative) (Detail) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 USD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2024 USD ($) MVA
Property, Plant and Equipment [Line Items] |  |  |  |  |
Noncontrolling Interests |  |  | $ 46 | $ 0 |
Income tax expense (benefit) | [1] |  | 55 | 55 |
Virginia Electric and Power Company |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Noncontrolling Interests |  |  | 46 | 0 |
Income tax expense (benefit) | [2] |  | 92 | $ 128 |
Virginia Electric and Power Company | CVOW Commercial Project |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Anticipated projected cost |  |  | 100 |  |
Ownership percentage |  |  |  |  | 50.00%
Charge for costs not expected to be recovered |  |  | 45 |  |
Noncontrolling Interests |  |  | 22 |  |
Income tax expense (benefit) |  |  | $ (6) |  |
Percentage of remaining construction costs, including contingency |  |  | 6.00% |  |
Virginia Electric and Power Company | CVOW Commercial Project | End of 2026 |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Targeted capacity provided by legislation | MVA |  |  |  |  | 2.6
Anticipated projected cost |  |  |  |  | $ 10,800
Virginia Electric and Power Company | CVOW Commercial Project | End of 2026 | Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Anticipated projected cost |  |  | $ 400 |  |
Virginia Electric and Power Company | CVOW Commercial Project | Scenario Forecast |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Charge for costs not expected to be recovered |  | $ 15 |  |  |
Noncontrolling Interests |  | $ 8 |  |  |
[1] | The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.
[2] | The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Virginia Power’s CODM.

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