Operating Revenue (Schedule of Operating Revenue) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		$ 17,725	$ 14,170	$ 13,752
Other revenues	[1],[2],[3]	(551)	(206)	420
Total operating revenue		17,174	13,964	14,172
Regulated Electric Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		5,261	4,509	4,833
Regulated Electric Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		4,480	3,194	3,102
Regulated Electric Sales | Industrial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		901	748	730
Regulated Electric Sales | Government and Other Retail
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		1,235	921	868
Regulated Electric Sales | Wholesale
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		234	175	128
Nonregulated Electric Sales
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		1,249	1,005	823
Regulated Gas Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		1,816	1,455	1,283
Regulated Gas Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		714	527	457
Regulated Gas Sales | Other
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		208	135	88
Nonregulated Gas Sales
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		25	96	174
Regulated Gas Transportation and Storage
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		1,047	945	801
Other Regulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		313	265	327
Other Nonregulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	[3],[4]	242	195	138
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		9,868	7,470	7,661
Other revenues	[1],[2],[3]	(214)		102
Total operating revenue		9,654	7,470	7,763
Virginia Electric and Power Company | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		4,039	3,366	3,677
Virginia Electric and Power Company | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		3,647	2,417	2,342
Virginia Electric and Power Company | Industrial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		472	367	380
Virginia Electric and Power Company | Government and Other Retail
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		1,172	862	804
Virginia Electric and Power Company | Wholesale
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		132	107	90
Virginia Electric and Power Company | Nonregulated Electric Sales
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		68	44	19
Virginia Electric and Power Company | Other Regulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		277	234	299
Virginia Electric and Power Company | Other Nonregulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	[3],[4]	$ 61	$ 73	$ 50

[1] Includes alternative revenue of $95 million, $56 million and $119 million at Dominion Energy and $72 million, $44 million and $82 million at Virginia Power for years ended December 31, 2022, 2021 and 2020, respectively.

[2] Includes revenue associated with services provided to discontinued operations of $5 million and $4 million for the years ended December 31, 2021 and 2020, respectively, at Dominion Energy.

[3] See Note 25 for amounts attributable to related parties and affiliates.

[4] Includes sales which are considered to be goods transferred at a point in time of $45 million, $34 million and $22 million for the years ended December 31, 2022, 2021 and 2020, 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 $42 million, $33 million and $20 million for the years ended December 31, 2022, 2021 and 2020, respectively, at Dominion Energy and $18 million, $21 million and $11 million for the years ended December 31, 2022, 2021 and 2020, respectively, at Virginia Power.