Operating Revenue (Schedule of Operating Revenue) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		$ 14,170	$ 13,752	$ 13,745
Other revenues	[1],[2]	(206)	420	656
Total operating revenue		13,964	14,172	14,401
Regulated Electric Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		4,509	4,833	4,325
Regulated Electric Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		3,194	3,102	3,219
Regulated Electric Sales | Industrial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		748	730	683
Regulated Electric Sales | Government and Other Retail
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		921	868	873
Regulated Electric Sales | Wholesale
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		175	128	176
Nonregulated Electric Sales
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		1,005	823	941
Regulated Gas Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		1,455	1,283	1,343
Regulated Gas Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		527	457	457
Regulated Gas Sales | Other
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		135	88	109
Nonregulated Gas Sales
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		96	174	495
Regulated Gas Transportation and Storage
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		945	801	742
Other Regulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		265	327	252
Other Nonregulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	[3],[4]	195	138	130
Virginia Electric and Power Company
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		7,470	7,661	8,036
Total operating revenue		7,470	7,763	8,108
Other revenues	[1],[4]		102	72
Virginia Electric and Power Company | Regulated Electric Sales | Residential
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		3,366	3,677	3,657
Virginia Electric and Power Company | Regulated Electric Sales | Commercial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		2,417	2,342	2,712
Virginia Electric and Power Company | Regulated Electric Sales | Industrial
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		367	380	455
Virginia Electric and Power Company | Regulated Electric Sales | Government and Other Retail
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		862	804	823
Virginia Electric and Power Company | Regulated Electric Sales | Wholesale
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		107	90	128
Virginia Electric and Power Company | Nonregulated Electric Sales
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		44	19	15
Virginia Electric and Power Company | Other Regulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers		234	299	190
Virginia Electric and Power Company | Other Nonregulated Revenues
Public Utilities General Disclosures [Line Items]
Operating revenue from contracts with customers	[3],[4]	$ 73	$ 50	$ 56

[1] Includes alternative revenue of $56 million, $119 million and $66 million at Dominion Energy and $44 million, $82 million and $52 million at Virginia Power for years ended December 31, 2021, 2020 and 2019, respectively.

[2] Includes revenue associated with services provided to discontinued operations of $5 million, $4 million and $6 million for the years ended December 31, 2021, 2020 and 2019, respectively.

[3] Includes sales which are considered to be goods transferred at a point in time of $34 million, $22 million and $37 million for the years ended December 31, 2021, 2020 and 2019, 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 $33 million, $20 million and $24 million for the years ended December 31, 2021, 2020 and 2019, respectively, at Dominion Energy and $21 million, $11 million and $17 million for the years ended December 31, 2021, 2020 and 2019, respectively, at Virginia Power.

[4] See Notes 9 and 25 for amounts attributable to related parties and affiliates.