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Defer interest payments on the hybrids.

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Early Redemption Charges Paid

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Nominal or face amount used to calculate payments on the derivative liability.

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Long-Term Debt (Narrative) (Detail) - USD ($)	1 Months Ended					5 Months Ended
Long-Term Debt (Narrative) (Detail) - USD ($)	Nov. 30, 2024	Oct. 31, 2024	May 31, 2024	Aug. 31, 2020	Jun. 30, 2020	May 31, 2024	Jan. 31, 2025	Dec. 31, 2024	Feb. 29, 2024	Dec. 31, 2023	Mar. 31, 2023	Aug. 31, 2022	Aug. 31, 2021	Oct. 31, 2014
Debt Instrument [Line Items]
Debt, redeemed remaining principal outstanding								$ 144,000,000				$ 154,000,000	$ 39,000,000
Period of deferral			10 years
Other long-term debt								214,000,000		$ 192,000,000
Virginia Electric and Power Company
Debt Instrument [Line Items]
Other long-term debt								$ 110,000,000		$ 72,000,000
Dominion Energy \| 2024 Series A JSN
Debt Instrument [Line Items]
Interest rate percentage			6.875%			6.875%
Debt instrument maturity year						2055
Interest reset period			5 years
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]						us-gaap:UsTreasuryUstInterestRateMember
Interest rate spread						2.386%
Interest rate minimum reset			6.875%			6.875%
Dominion Energy \| 2024 Series B JSN
Debt Instrument [Line Items]
Interest rate percentage			7.00%			7.00%
Debt instrument maturity year						2054
Interest reset period			5 years
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]						us-gaap:UsTreasuryUstInterestRateMember
Interest rate spread			2.511%
Interest rate minimum reset			7.00%			7.00%
Dominion Energy \| 2024 Series C JSN
Debt Instrument [Line Items]
Junior subordinated notes	$ 1,250,000,000
Interest rate percentage	6.625%
Debt instrument maturity year						2055
Period of deferral	10 years
Interest reset period	5 years
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:UsTreasuryUstInterestRateMember
Interest rate spread	2.207%
Interest Rate Swap
Debt Instrument [Line Items]
Derivative notional value					$ 2,000,000,000
Derivative maturity month and year					2024-12
Other long-term debt				$ 443,000,000	$ 326,000,000
Derivative imputed interest rate					1.19%
Interest Rate Swap \| Virginia Electric and Power Company
Debt Instrument [Line Items]
Debt, redeemed remaining principal outstanding											$ 448,000,000
Derivative notional value				$ 900,000,000
Derivative maturity month and year				2023-12
Derivative maturity year				2020
Derivative imputed interest rate				0.34%
Junior Subordinated Debt \| Dominion Energy
Debt Instrument [Line Items]
Junior subordinated notes			$ 2,000,000,000			$ 2,000,000,000
Debt, redeemed remaining principal outstanding		$ 685,000,000
Debt instrument maturity year		2054
Early redemption charges paid		$ 7,000,000
Early redemption charges paid after tax		$ 5,000,000
Junior Subordinated Debt \| Dominion Energy \| 2024 Series A JSN
Debt Instrument [Line Items]
Junior subordinated notes			1,000,000,000			1,000,000,000
Junior Subordinated Debt \| Dominion Energy \| 2024 Series B JSN
Debt Instrument [Line Items]
Junior subordinated notes			$ 1,000,000,000			$ 1,000,000,000
October 2014 Hybrids \| Junior Subordinated Debt
Debt Instrument [Line Items]
Junior subordinated notes														$ 685,000,000
Interest rate percentage														5.75%
Senior Secured Deferred Fuel Cost Bonds due in May 2029 \| Virginia Electric and Power Company
Debt Instrument [Line Items]
Interest rate percentage									5.088%
Debt instrument, face amount									$ 439,000,000
Senior Secured Deferred Fuel Cost Bonds due in May 2033 \| Virginia Electric and Power Company
Debt Instrument [Line Items]
Interest rate percentage									4.877%
Debt instrument, face amount									$ 843,000,000
First Mortgage Bonds Due in 2035 \| Subsequent Event \| DESC
Debt Instrument [Line Items]
Interest rate percentage							5.30%
Debt instrument, face amount							$ 450,000,000