Operating Revenue (Schedule of Operating Revenue) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		$ 4,085	$ 3,524
Other revenues	[1],[2]	(9)	108
Total operating revenue		4,076	3,632
Regulated Electric Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		1,569	1,365
Regulated Electric Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	[3]	1,238	1,094
Regulated Electric Sales | Industrial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		194	213
Regulated Electric Sales | Government and Other Retail
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		308	257
Regulated Electric Sales | Wholesale
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		43	36
Nonregulated Electric Sales
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		372	220
Regulated Gas Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		172	151
Regulated Gas Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		53	48
Regulated Gas Sales | Other
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		27	19
Regulated Gas Transportation and Storage
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		6	4
Other Regulated Revenue
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		44	88
Other Nonregulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	[2],[4],[5]	59	29
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		2,751	2,417
Other revenues	[1],[2]	14	72
Total operating revenue		2,765	2,489
Virginia Electric and Power Company | Regulated Electric Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		1,224	1,052
Virginia Electric and Power Company | Regulated Electric Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	[3]	1,027	881
Virginia Electric and Power Company | Regulated Electric Sales | Industrial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		97	106
Virginia Electric and Power Company | Regulated Electric Sales | Government and Other Retail
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		291	241
Virginia Electric and Power Company | Regulated Electric Sales | Wholesale
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		37	29
Virginia Electric and Power Company | Nonregulated Electric Sales
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		23	14
Virginia Electric and Power Company | Other Regulated Revenue
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		39	84
Virginia Electric and Power Company | Other Nonregulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	[2],[4],[5]	$ 13	$ 10

[1] Includes alternative revenue of $22 million and $28 million for the three months ended March 31, 2025 and 2024, respectively, at both Dominion Energy and Virginia Power.

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

[3] Includes large scale users including certain data center customers.

[4] Includes revenue from transition services agreements of $27 million and $4 million for the three months ended March 31, 2025 and 2024, respectively, at Dominion Energy.

[5] Includes sales of renewable energy credits of $10 million and $5 million for the three months ended March 31, 2025 and 2024, respectively, at Dominion Energy and $4 million and $2 million for the three months ended March 31, 2025 and 2024, respectively, at Virginia Power.