Variable Interest Entities - Schedule of Balance Sheet Included Balances for VPFS and OSWP (Detail) - USD ($) $ in Millions		Mar. 31, 2025		Dec. 31, 2024		Mar. 31, 2024	Dec. 31, 2023
Variable Interest Entity [Line Items]
Cash and cash equivalents	[1]	$ 355		$ 310	[2]
Customer receivables	[1]	2,045		2,169	[2]
Regulatory assets-current	[1]	996		992	[2]
Property, plant and equipment		71,169		68,862	[2]
Other Assets, Current	[1]	671		584	[2]
Regulatory assets-noncurrent	[1]	8,341		8,288	[2]
Other deferred charges and other assets	[1]	6,125		5,959	[2]
Total assets		104,555		102,415	[2]
Securities due within one year	[3]	2,070		1,725	[4]
Accrued interest, payroll and taxes	[3]	897		1,045	[4]
Other current liabilities	[5]	2,220		2,291	[4]
Securitization bonds		39,949		37,525	[4]
Other	[3]	8,702		8,731	[4]
Total liabilities		73,833		72,223	[4]
Virginia Electric and Power Company
Variable Interest Entity [Line Items]
Cash and cash equivalents		180	[6]	160	[6],[7]	$ 119	$ 90
Customer receivables	[6]	1,551		1,612	[7]
Regulatory assets-current	[6]	659		697	[7]
Property, plant and equipment		54,514		52,517	[7]
Other Assets, Current	[6]	267		194	[7]
Regulatory assets-noncurrent	[6]	4,565		4,537	[7]
Other deferred charges and other assets	[6],[8]	2,986		2,789	[7]
Total assets		70,303		68,387	[7]
Securities due within one year	[6]	1,298		548	[7]
Accrued interest, payroll and taxes	[6]	453		366	[7]
Other current liabilities	[8]	1,613		1,688	[7]
Securitization bonds		20,527		20,038	[7]
Other	[6],[8]	6,320		6,300	[7]
Total liabilities		44,254		43,234	[7]
Variable Interest Entity Not Primary Beneficiary | Virginia Electric and Power Company
Variable Interest Entity [Line Items]
Prepayments	[9]	0		0
Regulatory assets-current		119		124
Other Assets, Current		108		41
Regulatory assets-noncurrent		998		1,040
Total assets		1,225		1,205
Securities due within one year		163		163
Accrued interest, payroll and taxes		37		10
Securitization bonds		1,054		1,054
Total liabilities		1,254		1,227
Variable Interest Entity Not Primary Beneficiary | OSWP
Variable Interest Entity [Line Items]
Cash and cash equivalents		159		70
Customer receivables		0		0
Prepayments	[10]	7		10
Regulatory assets-current		4		6
Property, plant and equipment		6,632		5,844
Regulatory assets-noncurrent		52		52
Other deferred charges and other assets		0		0
Total assets		6,854		5,982
Accrued interest, payroll and taxes		0		0
Other current liabilities		6		0
Asset retirement obligations - noncurrent	[11]	67		38
Other		4		0
Total liabilities		$ 77		$ 38

[1] See Note 15 for amounts attributable to VIEs.

[2] Dominion Energy’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.

[3] See Note 15 for amounts attributable to VIEs.

[4] Dominion Energy’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.

[5] See Note 10 for amounts attributable to related parties.

[6] See Note 15 for amounts attributable to VIEs.

[7] Virginia Power’s Consolidated Balance Sheet at December 31, 2024 has been derived from the audited Consolidated Balance Sheet at that date.

[8] See Note 19 for amounts attributable to affiliates.

[9] Prepayments are presented in other current assets in the Companies’ Consolidated Balance Sheets.

[10] Prepayments are presented in other current assets in the Companies’ Consolidated Balance Sheets.

[11] Asset retirement obligation-noncurrent are presented in other deferred credits and other liabilities in the Companies’ Consolidated Balance Sheets.