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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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[Line Items] for Significant Accounting Policies [Table]

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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