Operating Revenue (Schedule of Operating Revenue) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		$ 3,685	$ 3,794	$ 8,441	$ 8,341
Other revenues	[1],[2]	109	(198)	605	(466)
Total operating revenue		3,794	3,596	9,046	7,875
Regulated Electric Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		1,124	1,117	2,410	2,404
Regulated Electric Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		1,147	1,089	2,217	1,987
Regulated Electric Sales | Industrial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		211	220	431	417
Regulated Electric Sales | Government and Other Retail
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		232	297	476	569
Regulated Electric Sales | Wholesale
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		36	68	80	115
Nonregulated Electric Sales
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		125	236	382	603
Regulated Gas Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		285	231	1,147	1,000
Regulated Gas Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		117	106	431	379
Regulated Gas Sales | Other
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		23	51	58	96
Nonregulated Gas Sales
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		6	4	7	5
Regulated Gas Transportation and Storage
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		252	241	563	538
Other Regulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		68	73	130	119
Other Nonregulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	[2],[3]	59	61	109	109
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		2,189	2,239	4,535	4,435
Other revenues	[1],[2]	62	(64)	(100)	(93)
Total operating revenue		2,251	2,175	4,635	4,342
Virginia Electric and Power Company | Regulated Electric Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		832	816	1,842	1,831
Virginia Electric and Power Company | Regulated Electric Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		917	874	1,783	1,591
Virginia Electric and Power Company | Regulated Electric Sales | Industrial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		99	110	215	213
Virginia Electric and Power Company | Regulated Electric Sales | Government and Other Retail
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		213	281	442	539
Virginia Electric and Power Company | Regulated Electric Sales | Wholesale
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		22	31	51	63
Virginia Electric and Power Company | Nonregulated Electric Sales
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		22	31	33	45
Virginia Electric and Power Company | Other Regulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		62	80	136	131
Virginia Electric and Power Company | Other Nonregulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	[2],[3]	$ 22	$ 16	$ 33	$ 22

[1] Includes alternative revenue of $57 million and $40 million for the three months ended June 30, 2023 and 2022, respectively, and $114 million and $70 million for the six months ended June 30, 2023 and 2022, respectively, at Dominion Energy and $50 million and $19 million for the three months ended June 30, 2023 and 2022, respectively, and $77 million and $27 million for the six months ended June 30, 2023 and 2022, respectively, at Virginia Power.

[2] See Note 19 for amounts attributable to affiliates

[3] Includes sales which are considered to be goods transferred at a point in time of $8 million and $14 million for the three months ended June 30, 2023 and 2022, respectively, and $16 million and $25 million for the six months ended June 30, 2023 and 2022, respectively, at Dominion Energy, primarily consisting of sales of commodities related to nonregulated extraction activities and other miscellaneous products. Additionally, sales of renewable energy credits were $24 million and $7 million for the three months ended June 30, 2023 and 2022, respectively, and $29 million and $11 million for the six months ended June 30, 2023 and 2022, respectively, at Dominion Energy and $19 million and less than $1 million for the three months ended June 30, 2023 and 2022, respectively, and $22 million and less than $1 million for the six months ended June 30, 2023 and 2022, respectively, at Virginia Power.