Operating Revenue (Schedule of Operating Revenue) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		$ 3,455	$ 3,080	$ 6,979	$ 6,532
Other revenues	[1],[2]	31	86	139	517
Total operating revenue		3,486	3,166	7,118	7,049
Regulated Electric Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		1,284	1,124	2,649	2,410
Regulated Electric Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		1,191	1,147	2,285	2,217
Regulated Electric Sales | Industrial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		213	211	426	431
Regulated Electric Sales | Government and Other Retail
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		252	232	509	476
Regulated Electric Sales | Wholesale
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		33	36	69	80
Nonregulated Electric Sales
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		234	125	454	382
Regulated Gas Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		42	43	193	179
Regulated Gas Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		28	28	76	81
Regulated Gas Sales | Other
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		16	16	35	39
Regulated Gas Transportation and Storage
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		5	5	9	9
Other regulated revenue
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		118	65	206	143
Other Nonregulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	[2],[3]	39	48	68	85
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		2,468	2,189	4,885	4,535
Other revenues	[1],[2]	69	63	141	101
Total operating revenue		2,537	2,252	5,026	4,636
Virginia Electric and Power Company | Regulated Electric Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		976	832	2,028	1,842
Virginia Electric and Power Company | Regulated Electric Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		972	917	1,853	1,783
Virginia Electric and Power Company | Regulated Electric Sales | Industrial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		111	99	217	215
Virginia Electric and Power Company | Regulated Electric Sales | Government and Other Retail
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		237	213	478	442
Virginia Electric and Power Company | Regulated Electric Sales | Wholesale
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		24	22	53	51
Virginia Electric and Power Company | Nonregulated Electric Sales
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		25	22	39	33
Virginia Electric and Power Company | Other regulated revenue
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		114	62	198	136
Virginia Electric and Power Company | Other Nonregulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	[2],[3]	$ 9	$ 22	$ 19	$ 33

[1] Includes alternative revenue of $33 million and $50 million for the three months ended June 30, 2024 and 2023, respectively, and $61 million and $77 million for the six months ended June 30, 2024 and 2023, respectively, at both Dominion Energy and Virginia Power.

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

[3] Sales of renewable energy credits were $7 million and $24 million for the three months ended June 30, 2024 and 2023, respectively, and $12 million and $29 million for the six months ended June 30, 2024 and 2023, respectively, at Dominion Energy and $3 million and $19 million for the three months ended June 30, 2024 and 2023, respectively, and $5 million and $22 million for the six months ended June 30, 2024 and 2023, respectively, at Virginia Power.