Operating Segments (Schedule of Segment Reporting Information, by Segment, Virginia Power) (Detail) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024		Dec. 31, 2023		Dec. 31, 2022
Segment Reporting Information [Line Items]
Operating Revenue		$ 3,400	$ 3,941	$ 3,486	$ 3,632	$ 3,534	$ 3,810	$ 3,166	$ 3,883	$ 14,459		$ 14,393		$ 13,938
Electric fuel and other energy-related purchases										3,614	[1]	3,935	[2]	3,711	[3]
Purchased electric capacity										74	[1]	55	[2]	59	[3]
Other operations and maintenance										4,188	[1],[4]	3,440	[2],[5]	5,178	[3],[6]
Depreciation and amortization										2,345	[1]	2,580	[2]	2,442	[3]
Other taxes										731	[1]	684	[2]	675	[3]
Total operating expenses										11,212		10,979		12,491
Interest and related charges (benefit)										1,887	[1]	1,674	[2]	1,002	[3]
Income tax expense (benefit)										308	[1]	568	[2]	59	[3]
Other income (expense)										694	[7]	903	[8]	(247)	[9]
Interest income										125	[7]	107	[8]	109	[9]
Noncontrolling Interests		(53)	0	0	0					(53)		0		0
Net Income (Loss)		145	$ 958	$ 580	$ 441	331	$ 153	$ 575	$ 972	2,124		2,031		1,191
Capital expenditures										12,427		10,235		7,758
Total assets (billions)		102,415				109,080				102,415		109,080
Virginia Electric and Power Company
Segment Reporting Information [Line Items]
Operating Revenue	[10]									10,235		9,573		9,654
Electric fuel and other energy-related purchases	[10],[11]									2,743		2,918		2,913
Purchased electric capacity	[11]									68		46		46
Other operations and maintenance	[11],[12]									2,529		1,966		2,608
Depreciation and amortization	[11]									1,644		1,871		1,736
Other taxes	[11]									333		298		303
Total operating expenses										7,317		7,099		7,606
Interest and related charges (benefit)	[10],[11]									848		764		642
Income tax expense (benefit)	[11]									408		389		294
Other income (expense)	[13]									169		116		(17)
Interest income	[13]									26		15		17
Noncontrolling Interests										(53)	[13]	0		0
Net Income (Loss)										1,910		1,452		1,112
Capital expenditures										9,968		7,196		5,187
Total assets (billions)		68,387				58,618				68,387		58,618
Virginia Electric and Power Company | Dominion Energy Virginia
Segment Reporting Information [Line Items]
Operating Revenue										10,235		9,573		9,643
Electric fuel and other energy-related purchases	[11]									2,743		2,918		2,913
Purchased electric capacity	[11]									68		46		38
Other operations and maintenance	[11],[12]									2,217		1,842		1,956
Depreciation and amortization	[11]									1,635		1,622		1,452
Other taxes	[11]									332		298		301
Total operating expenses										6,995		6,726		6,660
Interest and related charges (benefit)	[11]									856		772		645
Income tax expense (benefit)	[11]									443		471		514
Other income (expense)	[13]									100		65		64
Interest income	[13]									20		15		17
Noncontrolling Interests	[13]									50
Net Income (Loss)										2,011		1,684		1,905
Capital expenditures										9,968		7,196		5,187
Total assets (billions)		68,400				58,600				68,400		58,600
Virginia Electric and Power Company | Corporate and Other
Segment Reporting Information [Line Items]
Operating Revenue										0		0		11
Electric fuel and other energy-related purchases	[11]									0		0		0
Purchased electric capacity	[11]									0		0		8
Other operations and maintenance	[11],[12]									312		124		652
Depreciation and amortization	[11]									9		249		284
Other taxes	[11]									1		0		2
Total operating expenses										322		373		946
Interest and related charges (benefit)	[11]									(8)		(8)		(3)
Income tax expense (benefit)	[11]									(35)		(82)		(220)
Other income (expense)	[13]									69		51		(81)
Interest income	[13]									6		0		0
Noncontrolling Interests	[13]									(103)
Net Income (Loss)										(101)		(232)		(793)
Capital expenditures										0		0		$ 0
Total assets (billions)		$ 0				$ 0				$ 0		$ 0

[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] Includes impairment of assets and other charges (benefits) and losses (gains) on sale of assets.

[5] Includes impairment of assets and other charges (benefits) and losses (gains) on sale of assets.

[6] Includes impairment of assets and other charges (benefits) and losses (gains) on sale of assets.

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

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

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

[10] See Note 25 for amounts attributable to affiliates.

[11] 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.

[12] Includes impairment of assets and other charges (benefits).

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