Acquisitions and Dispositions - (Schedule of Results of Operations of Disposal Groups Reported As Discontinued Operations) (Details) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2023		Sep. 30, 2022		Sep. 30, 2023		Sep. 30, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense (benefit)		$ 1,200		$ 53		$ 1,300		$ 185
Net income (loss) attributable to Dominion Energy	[1]	(554)		152		(105)		775
East Ohio | Enbridge
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenue		214		206		761		738
Operating expense		128	[2]	140		497	[2]	503
Other income (expense)		7		7		22		21
Interest and related charges		19		12		51		21
Income (loss) before income taxes		74		61		235		235
Income tax expense (benefit)		39	[3]	5		58	[3]	29
Net income (loss) attributable to Dominion Energy		35	[4]	56	[5]	177	[4]	206	[5]
PSNC | Enbridge
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenue		86		93		532		539
Operating expense		80	[2]	94		386	[2]	406
Other income (expense)		3		3		8		6
Interest and related charges		13		11		38		30
Income (loss) before income taxes		(4)		(9)		116		109
Income tax expense (benefit)		383	[3]	(2)		409	[3]	23
Net income (loss) attributable to Dominion Energy		(387)	[4]	(7)	[5]	(293)	[4]	86	[5]
Questar Gas and Wexpro | Enbridge
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenue		150		114		1,151		846
Operating expense		127	[2]	100		939	[2]	658
Other income (expense)		3				6
Interest and related charges		17		11		50		31
Income (loss) before income taxes		9		3		168		157
Income tax expense (benefit)		525	[3]	(2)		557	[3]	29
Net income (loss) attributable to Dominion Energy		(516)	[4]	5	[5]	(389)	[4]	128	[5]
Other Sales | Tredegar Solar Fund I, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenue		2				5		3
Operating expense		7	[2]	1		29	[2]	4
Interest and related charges						1
Income (loss) before income taxes		(5)		(1)		(25)		(1)
Income tax expense (benefit)	[3]	(2)				7
Net income (loss) attributable to Dominion Energy		$ (3)	[4]	$ (1)	[5]	$ (18)	[4]	$ (1)	[5]

[1] Includes income tax expense of $1.2 billion and $53 million for the three months ended September 30, 2023 and 2022, respectively, and $1.3 billion and $185 million for the nine months ended September 30, 2023 and 2022, respectively.

[2] Other includes a charge of $15 million ($11 million after-tax) recorded in the second quarter of 2023 associated with the impairment of certain nonregulated solar assets.

[3] Includes amounts recorded in the third quarter of 2023 to reflect the recognition of deferred taxes on the outside basis of the applicable entities' stock upon meeting the classification as held for sale.

[4] Excludes $6 million and $2 million of income tax expense attributable to consolidated state and interim period tax allocation adjustments for the three and nine months ended September 30, 2023, respectively.

[5] Excludes $20 million and $7 million of income tax expense attributable to consolidated state and interim period tax allocation adjustments for the three and nine months ended September 30, 2022, respectively.