Property, Plant and Equipment (Narrative) (Detail)			1 Months Ended				3 Months Ended					12 Months Ended
		Nov. 08, 2023 USD ($)	Oct. 31, 2024 USD ($)	Jul. 31, 2024 USD ($) a mi MW	Feb. 29, 2024 USD ($)	Sep. 30, 2019 USD ($) MW	Dec. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2024 USD ($) MW		Dec. 31, 2023 USD ($)		Dec. 31, 2022 USD ($)
Property Plant And Equipment [Line Items]
Income tax expense (benefit)												$ 308,000,000	[1]	$ 568,000,000	[2]	$ 59,000,000	[3]
Noncontrolling interests							$ (53,000,000)	$ 0	$ 0	$ 0		(53,000,000)		0		0
Impairment of assets and other charges												600,000,000		307,000,000		1,401,000,000
CVOW Commercial Project Excluding Financing Costs
Property Plant And Equipment [Line Items]
Total project costs			$ 9,800,000,000
Maximum
Property Plant And Equipment [Line Items]
Additional capital contribution percentage					83.00%
Maximum | CVOW Commercial Project Excluding Financing Costs Condition Two
Property Plant And Equipment [Line Items]
Total project costs			$ 11,300,000,000
Minimum
Property Plant And Equipment [Line Items]
Additional capital contribution percentage					67.00%
Dominion Energy
Property Plant And Equipment [Line Items]
Impairment of assets and other charges																908,000,000
Asset impairment charges after tax																685,000,000
Property, plant and equipment, intangible assets and right-of-use lease assets down to estimated fair value																665,000,000
Virginia Power and Stonepeak | CVOW Commercial Project
Property Plant And Equipment [Line Items]
Remaining capital percentage					50.00%
Virginia Power and Stonepeak | Maximum
Property Plant And Equipment [Line Items]
Total project costs					$ 11,300,000,000
Corporate Office Building
Property Plant And Equipment [Line Items]
Sale of office building														40,000,000
Sale of utility property							19,000,000
Level 3 | Corporate Office Building
Property Plant And Equipment [Line Items]
Long-lived assets, estimated fair value							23,000,000					23,000,000		35,000,000
Level 3 | Nonregulated renewable natural gas facilities | Minimum
Property Plant And Equipment [Line Items]
Long-lived assets, estimated fair value							$ 1,000,000					1,000,000
Impairment of Assets and Other Charges | Corporate Office Building
Property Plant And Equipment [Line Items]
Impairment of assets and other charges												17,000,000		93,000,000
Asset impairment charges after tax												12,000,000		69,000,000
Impairment of Assets and Other Charges | Nonregulated renewable natural gas facilities
Property Plant And Equipment [Line Items]
Impairment of assets and other charges								27,000,000	33,000,000
Asset impairment charges after tax								$ 21,000,000	$ 25,000,000
Acquisition of Wind Project
Property Plant And Equipment [Line Items]
Offshore wind project price expected				$ 160,000,000
Virginia Electric and Power Company
Property Plant And Equipment [Line Items]
Income tax expense (benefit)	[4]											$ 408,000,000		389,000,000		294,000,000
Percentage of remaining construction costs, including contingency							5.00%					5.00%
Noncontrolling interests												$ (53,000,000)	[5]	0		0
Percentage of proceeds from sale of non controlling interests in CVOW commercial project			50.00%
Project easement cost paid		$ 65,000,000
Easement charges before tax		65,000,000
Easement charges after tax		$ 49,000,000
Virginia Electric and Power Company | CVOW Commercial Project
Property Plant And Equipment [Line Items]
Ownership percentage			50.00%		50.00%
Income tax expense (benefit)							$ (26,000,000)
Charge for costs not expected to be recovered							$ 206,000,000
Percentage of remaining construction costs, including contingency							5.00%					5.00%
Noncontrolling interests							$ 103,000,000
Anticipated projected cost						$ 600,000,000	10,700,000,000					$ 10,700,000,000
Increase for increased contingency for remaining construction activities						300,000,000
Virginia Electric and Power Company | CVOW Commercial Project Excluding Financing Costs
Property Plant And Equipment [Line Items]
Initial withholding amount			$ 100,000,000
Virginia Electric and Power Company | CVOW Commercial Project Excluding Financing Costs Condition Two
Property Plant And Equipment [Line Items]
Proceeds from sale of non controlling interests in CVOW commercial project			2,600,000,000
Virginia Electric and Power Company | Maximum | CVOW Commercial Project
Property Plant And Equipment [Line Items]
Incremental cost recovery amount												11,300,000,000
Incremental cost excluded from recovery amount												13,700,000,000
Construction costs												13,700,000,000
Virginia Electric and Power Company | Minimum
Property Plant And Equipment [Line Items]
Total project costs					$ 13,700,000,000
Virginia Electric and Power Company | Minimum | CVOW Commercial Project
Property Plant And Equipment [Line Items]
Initial withholding amount			$ 145,000,000
Incremental cost recovery amount												10,300,000,000
Incremental cost excluded from recovery amount												11,300,000,000
Virginia Electric and Power Company | Impairment of Assets and Other Charges
Property Plant And Equipment [Line Items]
Impairment of assets and other charges											$ 191,000,000	25,000,000
Asset impairment charges after tax											$ 142,000,000	18,000,000
Virginia Electric and Power Company | End of 2026 | CVOW Commercial Project
Property Plant And Equipment [Line Items]
Anticipated projected cost						$ 10,700,000,000
Targeted capacity provided by legislation | MW						2,600
Stonepeak | Maximum
Property Plant And Equipment [Line Items]
Total project costs					13,700,000,000
Additional capital costs					11,300,000,000
Stonepeak | Minimum
Property Plant And Equipment [Line Items]
Total project costs					$ 11,300,000,000
Acquisition of Solar Project at Schools in Virginia
Property Plant And Equipment [Line Items]
Anticipated projected cost							5,000,000					$ 5,000,000
Aggregate generation capacity | MW												3
Project cost							$ 16,000,000					$ 16,000,000
Aggregate generation capacity of service solar facilities | MW												7
Utility Property
Property Plant And Equipment [Line Items]
Sale of utility property														12,000,000		20,000,000
Gain on sale of asset														11,000,000		20,000,000
Gain on sale of asset after tax														$ 8,000,000		$ 15,000,000
Acquisition of Offshore Wind Project
Property Plant And Equipment [Line Items]
Date Agreement Entered				2024-07
Acres Of Area Acquired | a				40,000
Miles Of Area Acquired | mi				27
Date Agreement Closed												October 2024
Power generating capacity | MW				800

[1] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.

[2] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.

[3] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Dominion Energy’s CODM.

[4] The significant expense categories and amounts in the segment information presented above align with the segment-level information that is regularly provided to Virginia Power’s CODM.

[5] Items designated are other segment items for each reportable segment.