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 appeals filed.

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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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Public utilities, approved capital investment.

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Public utilities, approved operations and maintenance investment.

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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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Public utilities new project on stepdown conversion pilot program.

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Public utilities number of overhead stepdown transformers.

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Public utilities one time bill credits to residential customers.

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No definition available.

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Public utilities operating expense actual fuel expenses under recovered balance.

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No definition available.

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Public utilities operating expense estimated fuel expenses under recovered balance.

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No definition available.

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

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Public utilities property plant and equipment requested cost of construction.

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No definition available.

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Public utilities, proposed capital investment.

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No definition available.

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Public Utilities Proposed Earned Return On Equity Percentage

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No definition available.

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Public utilities, proposed operations and maintenance investment.

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Public utilities proposed rate start date.

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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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No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480100/505-10-S45-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-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)	Oct. 31, 2026 USD ($)	Oct. 30, 2026 USD ($)	Sep. 30, 2026 USD ($) Appeal	Aug. 31, 2026 USD ($) Appeal	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
North Carolina Regulation \| 2025 Fuel Filing
Public Utilities General Disclosures [Line Items]
Rate year beginning				Feb. 01, 2026
Increase (decrease) in revenue requirement				$ 23,000,000
North Carolina Regulation \| 2026 Fuel Filing
Public Utilities General Disclosures [Line Items]
Rate year beginning				Feb. 01, 2027
First Option \| North Carolina Regulation \| 2026 Fuel Filing
Public Utilities General Disclosures [Line Items]
Increase (decrease) in revenue requirement				$ 105,000,000
Estimated under-recovered fuel balances				$ 55,000,000
Second Option \| North Carolina Regulation \| 2026 Fuel Filing
Public Utilities General Disclosures [Line Items]
Rate year beginning				Feb. 01, 2027
Increase (decrease) in revenue requirement				$ 77,000,000
Estimated under-recovered fuel balances				$ 55,000,000
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
Number of appeals filed \| Appeal				2
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 \| GTSA Filing \| Subsequent Event
Public Utilities General Disclosures [Line Items]
Approved capital investment		$ 388,000,000
Approved 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 fuel 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			7 years			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 fuel balances			$ 932,000,000															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 fuel 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					$ 322,000,000		219,000,000							$ 331,000,000
Increase in proposed base rate percentage					12.70%
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 \| Natural Gas Rates \| Subsequent Event
Public Utilities General Disclosures [Line Items]
Increase (decrease) in revenue requirement	$ 675,000,000
Total revenue requirement	$ 21,000,000
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
Number of appeals filed \| Appeal			2
Dominion Energy South Carolina Inc \| 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