Consolidated Statements of Equity (Unaudited) - USD ($) $ in Millions	Total		Cumulative-effect of Changes in Accounting Principles	Preferred Stock	Common Stock	Retained Earnings	Retained Earnings Cumulative-effect of Changes in Accounting Principles	AOCI	Total Shareholders' Equity	Total Shareholders' Equity Cumulative-effect of Changes in Accounting Principles	Noncontrolling Interests
Beginning balance at Dec. 31, 2019	$ 34,033		$ (48)	$ 2,387	$ 23,824	$ 7,576	$ (48)	$ (1,793)	$ 31,994	$ (48)	$ 2,039
Beginning balance (in shares) at Dec. 31, 2019				2,000,000	838,000,000
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
Net income (loss) including noncontrolling interests	$ (1,240)					(1,083)			(1,083)		(157)
Issuance of stock	481				$ 481				481
Issuance of stock (in shares)					6,000,000
Stock repurchases	(2,385)				$ (2,385)				(2,385)
Stock repurchases (in shares)					(28,000,000)
Stock awards (net of change in unearned compensation)	22				$ 22				22
Preferred stock dividends (see Note 16)	(48)					(48)			(48)
Common stock dividends and distributions	(2,515)					(2,362)			(2,362)		(153)
Other comprehensive income (loss), net of tax	(223)							(223)	(223)
Other	(11)				(12)				(12)		1
Ending balance at Sep. 30, 2020	28,066			$ 2,387	$ 21,930	4,035		(2,016)	26,336		1,730
Ending balance (in shares) at Sep. 30, 2020				2,000,000	816,000,000
Beginning balance at Jun. 30, 2020	30,884			$ 2,387	$ 23,984	4,480		(1,980)	28,871		2,013
Beginning balance (in shares) at Jun. 30, 2020				2,000,000	840,000,000
Net income (loss) including noncontrolling interests	131					356			356		(225)
Issuance of stock	333				$ 333				333
Issuance of stock (in shares)					4,000,000
Stock repurchases	(2,385)				$ (2,385)				(2,385)
Stock repurchases (in shares)					(28,000,000)
Stock awards (net of change in unearned compensation)	9				$ 9				9
Preferred stock dividends (see Note 16)	(16)					(16)			(16)
Common stock dividends and distributions	(844)					(785)			(785)		(59)
Other comprehensive income (loss), net of tax	(36)							(36)	(36)
Other	(10)				(11)				(11)		1
Ending balance at Sep. 30, 2020	28,066			$ 2,387	$ 21,930	4,035		(2,016)	26,336		1,730
Ending balance (in shares) at Sep. 30, 2020				2,000,000	816,000,000
Beginning balance at Dec. 31, 2020	26,461	[1]		$ 2,387	$ 21,258	4,189		(1,717)	26,117		344
Beginning balance (in shares) at Dec. 31, 2020				2,000,000	806,000,000
Net income (loss) including noncontrolling interests	1,969					1,947			1,947		22
Issuance of stock	292				$ 292				292
Issuance of stock (in shares)					4,000,000
Stock repurchases (in shares)					0
Stock awards (net of change in unearned compensation)	24				$ 24				24
Preferred stock dividends (see Note 16)	(48)					(48)			(48)
Common stock dividends and distributions	(1,566)					(1,526)			(1,526)		(40)
Other comprehensive income (loss), net of tax	101							101	101
Other	(1)				(1)				(1)
Ending balance at Sep. 30, 2021	27,232			$ 2,387	$ 21,573	4,562		(1,616)	26,906		326
Ending balance (in shares) at Sep. 30, 2021				2,000,000	810,000,000
Beginning balance at Jun. 30, 2021	26,884			$ 2,387	$ 21,369	4,434		(1,640)	26,550		334
Beginning balance (in shares) at Jun. 30, 2021				2,000,000	807,000,000
Net income (loss) including noncontrolling interests	666					654			654		12
Issuance of stock	195				$ 195				195
Issuance of stock (in shares)					3,000,000
Stock awards (net of change in unearned compensation)	9				$ 9				9
Preferred stock dividends (see Note 16)	(16)					(16)			(16)
Common stock dividends and distributions	(529)					(510)			(510)		(19)
Other comprehensive income (loss), net of tax	24							24	24
Other	(1)										(1)
Ending balance at Sep. 30, 2021	$ 27,232			$ 2,387	$ 21,573	$ 4,562		$ (1,616)	$ 26,906		$ 326
Ending balance (in shares) at Sep. 30, 2021				2,000,000	810,000,000

[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2020 has been derived from the audited Consolidated Balance Sheet at that date.