Application date of public utilities transmission.

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Common stock shares authorized amount but unissued.

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Facility expected cost, excluding financing costs.

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GW facility.

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Increase decrease in annual base fuel component recoveries.

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Increase in proposed base rate percentage.

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Issuance of bonds number of years of tenors.

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Kilo volt ampere.

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Kilo Volt Line.

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Kilo volt switchyard approval requested for construction.

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Number of existing corridor lines connected to substation.

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Percentage of all revenue collected required by legislation.

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Percentage of undivided interest owned in the plant and electrical output.

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Power generation, targeted capacity provided by legislation.

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

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Public utilities actual earned return on equity percentage.

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- Definition

Public utilities authorized return on equity percentage.

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

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

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Public utilities, length of transmission line.

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- Definition

Public utilities new project on stepdown conversion pilot program.

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- Definition

Public utilities number of overhead stepdown transformers.

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- Definition

Public utilities one time bill credits to residential customers.

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- Definition

Public utilities operating expense actual fuel expenses under recovered balance.

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Public utilities operating expense estimated fuel expenses under recovered balance.

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

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No definition available.

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- Definition

Public utilities property plant and equipment requested cost of construction.

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- Definition

Public utilities, proposed capital investment.

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- Definition

Public Utilities Proposed Earned Return On Equity Percentage

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Public utilities, proposed operations and maintenance investment.

+ References

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Public utilities proposed rate start date.

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- Definition

Public utilities proposes to number of additional feeders requested approval.

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Public utilities recovery of fuel cost requirement.

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Public Utilities, Requested Rate, Amount

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

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- Definition

Public utilities, storm damage increase (decrease), amount.

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- Definition

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

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

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Regulatory Matters (Narrative) (Detail)	1 Months Ended													12 Months Ended
Regulatory Matters (Narrative) (Detail)	Jul. 31, 2026 USD ($) CorridorLines mi kV	Jun. 30, 2026 USD ($)	May 31, 2026 USD ($)	Apr. 30, 2026 USD ($) GW	Apr. 30, 2026 USD ($)	Apr. 30, 2026 USD ($) MW	Apr. 30, 2026 USD ($)	Mar. 31, 2026 USD ($) Components Project $ / shares	Feb. 28, 2026 USD ($)	Jan. 31, 2026 USD ($)	Nov. 30, 2025 USD ($)	Oct. 31, 2025 USD ($) MW	Feb. 28, 2025	Jun. 30, 2026 USD ($) MW	Dec. 31, 2025 USD ($) kV	Jun. 30, 2025 USD ($)
Electric Base Rate Case
Public Utilities General Disclosures [Line Items]
Authorized return percentage			9.99%							9.94%
Percentage of earned return										4.78%
Percentage of proposed earned return										10.50%
Non-Fuel, Base Rate
Public Utilities General Disclosures [Line Items]
Authorized return percentage							9.95%
Percentage of earned return							7.53%
Percentage of proposed earned return							10.50%
Virginia Regulation \| 2025 Biennial Review
Public Utilities General Disclosures [Line Items]
Authorized return percentage											9.80%
Base rate increase effective January 2026											$ 566,000,000
Base rate increase effective January 2027											$ 210,000,000
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Common stock shares authorized but unissued shares			$ 3,600,000,000					$ 5,100,000,000
Common stock par value \| $ / shares								$ 0
Virginia Electric and Power Company \| Non-Fuel, Base Rate
Public Utilities General Disclosures [Line Items]
Increase (decrease) in revenue requirement					$ 37,000,000
Virginia Electric and Power Company \| Utility Scale Solar
Public Utilities General Disclosures [Line Items]
Targeted capacity provided by legislation \| MW						532						845
Virginia Electric and Power Company \| Energy Storage
Public Utilities General Disclosures [Line Items]
Targeted capacity provided by legislation \| MW												155		80
Virginia Electric and Power Company \| Utility Scale Solar and Energy Storage
Public Utilities General Disclosures [Line Items]
Proposed cost of project				$ 1,500,000,000	$ 1,500,000,000	$ 1,500,000,000	$ 1,500,000,000					$ 2,900,000,000
Virginia Electric and Power Company \| GTSA Filing
Public Utilities General Disclosures [Line Items]
Number of additional feeders request approval \| Components								41
New project on stepdown conversion pilot program \| Project								1
Number of overhead stepdown transformers \| Components								24
Kilo volt ampere								500 kVA and 333 kVA
Proposed capital investment								$ 983,000,000
Proposed operations and maintenance investment								$ 125,000,000
Virginia Electric and Power Company \| Virginia Regulation
Public Utilities General Disclosures [Line Items]
Percentage of all revenue collected required by legislation		45.00%
Virginia Electric and Power Company \| Virginia Regulation \| Annual Fuel Factor
Public Utilities General Disclosures [Line Items]
Rate year beginning			Jul. 01, 2026
Total revenue requirement			$ 2,700,000,000
Estimated under-recovered balances		$ 1,100,000,000												$ 1,000,000,000		$ 1,000,000,000
Actual under-recovered balances														66,000,000		66,000,000
Issuance of bonds number of years of tenors		15 years
Virginia Electric and Power Company \| Virginia Regulation \| Maximum \| Annual Fuel Factor
Public Utilities General Disclosures [Line Items]
Issuance of bonds number of years of tenors		10 years
Virginia Electric and Power Company \| End of Year 2045 \| Virginia Regulation \| Short-duration Energy Storage
Public Utilities General Disclosures [Line Items]
Targeted capacity provided by legislation \| GW				16
Virginia Electric and Power Company \| End of Year 2045 \| Virginia Regulation \| Long-duration Energy Storage
Public Utilities General Disclosures [Line Items]
Targeted capacity provided by legislation \| GW				4
Virginia Electric and Power Company \| End of Year 2030 \| Virginia Regulation \| Short-duration Energy Storage
Public Utilities General Disclosures [Line Items]
Targeted capacity provided by legislation \| GW				4
Virginia Electric and Power Company \| End of Year 2035 \| Virginia Regulation \| Long-duration Energy Storage
Public Utilities General Disclosures [Line Items]
Targeted capacity provided by legislation				2		800
Virginia Electric and Power Company \| First Option \| Virginia Regulation \| Annual Fuel Factor
Public Utilities General Disclosures [Line Items]
Recovery of fuel cost requirement			3,800,000,000
Increase (decrease) in revenue requirement			1,900,000,000
Virginia Electric and Power Company \| Second Option \| Virginia Regulation \| Annual Fuel Factor
Public Utilities General Disclosures [Line Items]
Estimated under-recovered balances														1,000,000,000
Actual under-recovered balances																$ 66,000,000
Virginia Electric and Power Company \| Securitization Option \| Virginia Regulation \| Annual Fuel Factor
Public Utilities General Disclosures [Line Items]
Increase (decrease) in revenue requirement			702,000,000
Estimated under-recovered balances														$ 1,000,000,000
Dominion Energy South Carolina Inc \| Electric Base Rate Case
Public Utilities General Disclosures [Line Items]
Increase (decrease) in revenue requirement			219,000,000							$ 331,000,000
Bill credits to residential customers			$ 5,000,000
Dominion Energy South Carolina Inc \| Natural Gas Rates
Public Utilities General Disclosures [Line Items]
Increase (decrease) in revenue requirement		$ 22,000,000
Total revenue requirement		$ 676,000,000
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										54,000,000
Dominion Energy South Carolina Inc \| South Carolina Regulation \| Cost of Fuel
Public Utilities General Disclosures [Line Items]
Rate year beginning													2026-05
Application date													2026-02
Increase decrease in annual base fuel component recoveries									$ 36,000,000
Dominion Energy South Carolina Inc \| South Carolina Regulation \| Electric Base Rate Case
Public Utilities General Disclosures [Line Items]
Increase (decrease) in net of storm damage										$ 9,000,000
Dominion Energy South Carolina Inc \| South Carolina Regulation \| Canadys Station
Public Utilities General Disclosures [Line Items]
Proposed cost of project															$ 100,000,000
Percentage of undivided interest owned in the plant and electrical output															50.00%
Facility expected cost, excluding financing costs															$ 5,000,000,000
GW facility															2.2
Kilo Volt Switchyard Approval Requested for Construction \| kV															230
Dominion Energy South Carolina Inc \| Subsequent Event \| Electric Base Rate Case
Public Utilities General Disclosures [Line Items]
Increase (decrease) in revenue requirement	$ 322,000,000
Increase in proposed base rate percentage	12.70%
Dominion Energy South Carolina Inc \| Subsequent Event \| South Carolina Regulation \| Electric Transmission Project
Public Utilities General Disclosures [Line Items]
Application date	2026-07
Cost Estimate	$ 110,000,000
Number of existing corridor lines connected to substation \| CorridorLines	5
Miles of Lines \| mi	84
Type of Line \| kV	230