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Significant Accounting Policies (Narrative) (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment | $ 75,810 | $ 68,862 | [1] | $ 18
Virginia Electric and Power Company |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment | $ 58,189 | $ 52,517 | [2] |
Virginia Power |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment |  |  |  | $ 25
OSWP | Stonepeak |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of equity interest sold to noncontrolling interest owners | 50.00% |  |  |
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Virginia Power’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.

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