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Regulatory Matters (Narrative) (Detail 3) - South Carolina Regulation $ in Millions	1 Months Ended								3 Months Ended	12 Months Ended
	Feb. 27, 2025 USD ($)	Jan. 31, 2025 USD ($)	Dec. 31, 2024 USD ($) mi kV	Sep. 30, 2024 USD ($)	Mar. 31, 2024 USD ($) mi kV	Jan. 31, 2024 USD ($)	Jul. 31, 2023 USD ($)	Mar. 31, 2023	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Public Utilities, General Disclosures [Line Items]
One-time bill credit			$ 7							$ 7
Impairment of assets and other charges (benefits)									$ 58
Impairment of assets and other charges (benefits) after tax									44
Materials and supplies inventory write down									50
Materials and fuel purchase									$ 50
Electric Base Rate Case
Public Utilities, General Disclosures [Line Items]
Increase (decrease) in revenue requirement							$ 219
Percentage of earned return					4.32%
Requested return on equity percentage							9.94%
Percentage of proposed earned return								10.60%
Authorized return percentage					9.50%
Dominion Energy South Carolina Inc | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Increase (decrease) in annual base fuel component recoveries	$ 154
Dominion Energy South Carolina Inc | Electric DSM Programs
Public Utilities, General Disclosures [Line Items]
Public energy efficiency programs cost rate adjustment approval request to recover amount						$ 47
Dominion Energy South Carolina Inc | Electric DSM Programs | Subsequent Event
Public Utilities, General Disclosures [Line Items]
Public energy efficiency programs cost rate adjustment approval request to recover amount		$ 46
Dominion Energy South Carolina Inc | Electric Base Rate Case
Public Utilities, General Disclosures [Line Items]
Increase (decrease) in revenue requirement				$ 291	$ 295
Increase (decrease) in net of storm damage						$ 4
Increase in proposed base rate percentage				12.59%
Dominion Energy South Carolina Inc | Cost of Fuel
Public Utilities, General Disclosures [Line Items]
Proposed increase (decrease) in annual base fuel component recoveries										315
Increase (decrease) in annual base fuel component recoveries					316
Dominion Energy South Carolina Inc | Electric Transmission Project
Public Utilities, General Disclosures [Line Items]
Cost Estimate			$ 55		$ 40					$ 55
Miles of Lines | mi			17		7
Type of Line | kV			230		230

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