Application date of public utilities transmission.

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- Definition

Asset impairment charge (benefit).

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Asset impairment charge (benefit), after tax.

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Charge for electric base rate case.

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Charge for electric base rate case after tax.

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Common stock shares authorized amount but unissued.

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- Definition

Increase (Decrease) In fuel component electric rates.

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- Definition

Kilo Volt Line.

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No definition available.

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- Definition

Percentage of energy efficiency target based on energy savings from previous year baseline.

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No definition available.

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Percentage of energy savings target for next twelve months

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- Definition

Percentage of energy savings target for three year.

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- Definition

Percentage of energy savings target for two year

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- Definition

Power generation, targeted capacity provided by legislation.

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- Definition

Proposed increase (decrease) in annual base fuel component recoveries.

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No definition available.

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- Definition

Public energy efficiency programs cost rate adjustment approval request to recover amount.

+ References

No definition available.

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- Definition

Public utilities actual earned return on equity percentage.

+ References

No definition available.

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- Definition

Public utilities approved base rate increase (decrease) amount Effective January 2026.

+ References

No definition available.

+ Details

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- Definition

Public utilities authorized return on equity percentage.

+ References

No definition available.

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- Definition

Public utilities base rate increase (decrease) effective January 2027.

+ References

No definition available.

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- Definition

Public utilities base rate increase (decrease) effective January 2026.

+ References

No definition available.

+ Details

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- Definition

Public utilities, length of transmission line.

+ References

No definition available.

+ Details

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- Definition

Public utilities materials and supplies inventory write down.

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No definition available.

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- Definition

Public utilities new project on remote sensing, image management and analytical program.

+ References

No definition available.

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- Definition

Public utilities number of mainfeeders requested approval.

+ References

No definition available.

+ Details

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- Definition

Public utilities operating expense estimated fuel expenses under recovered balance.

+ References

No definition available.

+ Details

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- Definition

Public utilities, property, plant and equipment, expected cost of construction.

+ References

No definition available.

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- Definition

Public utilities property plant and equipment requested cost of construction.

+ References

No definition available.

+ Details

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- Definition

Public utilities, proposed capital investment.

+ References

No definition available.

+ Details

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- Definition

Public utilities, proposed operations and maintenance investment.

+ References

No definition available.

+ Details

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- Definition

Public utilities proposes to number of additional feeders requested approval.

+ References

No definition available.

+ Details

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- Definition

Public utilities, purchased capacity expense.

+ References

No definition available.

+ Details

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- Definition

Public utilities requested alternative amount base rate increase (decrease) effective January 2016.

+ References

No definition available.

+ Details

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- Definition

Public utilities requested alternative amount base rate increase (decrease) effective January 2017.

+ References

No definition available.

+ Details

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- Definition

Public Utilities, Requested Rate, Amount

+ References

No definition available.

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- Definition

Public utilities, start date of proposed rate in month and year.

+ References

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- Definition

Face amount per share of no-par value common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Percentage of public utility's requested equity to capital, including debt and equity.

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- Definition

Amount of public utility's requested rate increase (decrease) with regulatory agency.

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No definition available.

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- Definition

Percentage of public utility's requested return on equity.

+ References

No definition available.

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Regulatory Matters (Narrative) (Detail)	1 Months Ended										3 Months Ended		9 Months Ended
Regulatory Matters (Narrative) (Detail)	Oct. 31, 2025 USD ($) MW	Sep. 30, 2025 USD ($)	Aug. 31, 2025 USD ($)	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($) Components Project MW	Feb. 28, 2025	Jan. 31, 2025 USD ($)	Dec. 31, 2024 USD ($) mi kV	Oct. 31, 2024 USD ($) MW	Apr. 30, 2020	Sep. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Sep. 30, 2025 USD ($)	Apr. 30, 2025 USD ($) $ / shares
Targeted To Reach By End Of Year Five [Member]
Public Utilities General Disclosures [Line Items]
Energy efficiency target percentage. based on energy savings from 2019 baseline										5.00%
Virginia Regulation \| 2025 Biennial Review
Public Utilities General Disclosures [Line Items]
Requested alternative amount base rate increase effective January 2026					$ 458,000,000
Requested alternative amount base rate increase effective January 2027					173,000,000
Percentage of earned return													7.77%
Authorized return percentage													9.70%
Base rate increase effective January 2026			$ 706,000,000		822,000,000
Base rate increase effective January 2027			$ 256,000,000		$ 345,000,000
Proposed base rates reflect an ROE													52.10%
Common equity capitalization to total capitalization ratio													10.40%
South Carolina Regulation
Public Utilities General Disclosures [Line Items]
Write down certain materials and supplies inventory											$ 50,000,000
South Carolina Regulation \| Operating Segments
Public Utilities General Disclosures [Line Items]
Charge in connection with the electric base rate case											58,000,000
Charge in connection with the electric base rate case, after tax											$ 44,000,000
Subsequent Event \| North Carolina Regulation \| Virginia Power Fuel Filing
Public Utilities General Disclosures [Line Items]
Increase (Decrease) In fuel component of electric rates	$ 49,000,000
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Common stock shares authorized but unissued shares														$ 3,500,000,000
Common stock par value \| $ / shares														$ 0
Percentage of energy savings target for 2026						3.00%
Percentage of energy savings target for 2027						4.00%
Percentage of energy savings target for 2028						5.00%
Virginia Electric and Power Company \| Impairment of Assets and Other Charges
Public Utilities General Disclosures [Line Items]
Impairment of assets and other charges (benefits)												$ (17,000,000)
Impairment of assets and other charges (benefits) after tax												$ (12,000,000)
Virginia Electric and Power Company \| Utility Scale Solar
Public Utilities General Disclosures [Line Items]
Proposed cost of project									$ 605,000,000
Targeted capacity provided by legislation \| MW									208
Virginia Electric and Power Company \| GTSA Filing
Public Utilities General Disclosures [Line Items]
Number of Mainfeeders Requested Approval for power undertook \| Components					3
Number of additional feeders request approval \| Components					20
New project on remote sensing, image management and analytical program \| Project					1
Proposed capital investment					$ 278,000,000
Proposed operations and maintenance investment					5,000,000
Virginia Electric and Power Company \| Chesterfield Energy Reliability Center
Public Utilities General Disclosures [Line Items]
Proposed cost of project					$ 1,500,000,000
Targeted capacity provided by legislation \| MW					944
Virginia Electric and Power Company \| Virginia Regulation \| Annual Fuel Factor
Public Utilities General Disclosures [Line Items]
Total revenue requirement					$ 2,600,000,000
Rate year beginning					2025-07
Increase (decrease) in revenue requirement					$ 860,000,000
Estimated under-recovered balances					205,000,000
Purchased capacity expense					$ 120,000,000
Virginia Electric and Power Company \| Subsequent Event \| Utility Scale Solar
Public Utilities General Disclosures [Line Items]
Targeted capacity provided by legislation \| MW	5
Virginia Electric and Power Company \| Subsequent Event \| Energy Storage
Public Utilities General Disclosures [Line Items]
Targeted capacity provided by legislation \| MW	155
Virginia Electric and Power Company \| Subsequent Event \| Utility Scale Solar and Energy Storage
Public Utilities General Disclosures [Line Items]
Proposed cost of project	$ 2,900,000,000
Dominion Energy South Carolina Inc \| Natural Gas Rates
Public Utilities General Disclosures [Line Items]
Total revenue requirement		$ 594,000,000		$ 596,000,000
Approved base rate increase effective January 2026		$ 15,000,000
Base rate increase effective January 2026				$ 17,000,000
Dominion Energy South Carolina Inc \| South Carolina Regulation \| Electric DSM Programs
Public Utilities General Disclosures [Line Items]
Public energy efficiency programs cost rate adjustment approval request to recover amount							$ 46,000,000
Dominion Energy South Carolina Inc \| South Carolina Regulation \| Cost of Fuel
Public Utilities General Disclosures [Line Items]
Rate year beginning						2025-05
Application date						2025-02
Proposed increase (decrease) in annual base fuel component recoveries													$ 154,000,000
Dominion Energy South Carolina Inc \| South Carolina Regulation \| Electric Transmission Projects
Public Utilities General Disclosures [Line Items]
Application date								2024-12
Type of Line \| kV								230
Miles of Lines \| mi								17
Cost Estimate								$ 55,000,000