Operating Revenue (Schedule of Operating Revenue) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		$ 3,785	$ 3,758	$ 10,764	$ 10,290
Other revenues	[1],[2]	156	52	295	569
Total operating revenue		3,941	3,810	11,059	10,859
Regulated Electric Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		1,535	1,558	4,184	3,968
Regulated Electric Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		1,248	1,236	3,533	3,453
Regulated Electric Sales | Industrial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		216	227	642	658
Regulated Electric Sales | Government and Other Retail
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		303	288	812	764
Regulated Electric Sales | Wholesale
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		39	53	108	133
Nonregulated Electric Sales
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		239	229	693	611
Regulated Gas Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		30	28	223	207
Regulated Gas Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		24	25	100	106
Regulated Gas Sales | Other
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		15	19	50	58
Regulated Gas Transportation and Storage
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		6	4	15	13
Other regulated revenue
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		87	61	293	204
Other Nonregulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	[2],[3],[4]	43	30	111	115
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		2,705	2,598	7,590	7,133
Other revenues	[1],[2]	57	47	198	148
Total operating revenue		2,762	2,645	7,788	7,281
Virginia Electric and Power Company | Regulated Electric Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		1,155	1,133	3,183	2,975
Virginia Electric and Power Company | Regulated Electric Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		998	962	2,851	2,745
Virginia Electric and Power Company | Regulated Electric Sales | Industrial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		113	109	330	324
Virginia Electric and Power Company | Regulated Electric Sales | Government and Other Retail
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		285	269	763	711
Virginia Electric and Power Company | Regulated Electric Sales | Wholesale
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		29	37	82	88
Virginia Electric and Power Company | Nonregulated Electric Sales
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		30	22	69	55
Virginia Electric and Power Company | Other regulated revenue
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		84	57	282	193
Virginia Electric and Power Company | Other Nonregulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	[2],[3],[4]	$ 11	$ 9	$ 30	$ 42

[1] Includes alternative revenue of $24 million and $34 million for the three months ended September 30, 2024 and 2023, respectively, and $85 million and $111 million for the nine months ended September 30, 2024 and 2023, respectively, at both Dominion Energy and Virginia Power.

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

[3] Includes revenue from transition services agreements of $17 million and $3 million for the three months ended September 30, 2024 and 2023, respectively, and $34 million and $16 million for the nine months ended September 30, 2024 and 2023, respectively, at Dominion Energy.

[4] Sales of renewable energy credits were $10 million and $7 million for the three months ended September 30, 2024 and 2023, respectively, and $22 million and $36 million for the nine months ended September 30, 2024 and 2023, respectively, at Dominion Energy and $4 million and $2 million for the three months ended September 30, 2024 and 2023, respectively, and $9 million and $24 million for the nine months ended September 30, 2024 and 2023, respectively, at Virginia Power.