Consolidated Statements of Equity - USD ($) $ in Millions	Total	Cumulative-effect of Changes in Accounting Principles	Common Units	Preferred Stock	Common Stock	Common Stock Cumulative-effect of Changes in Accounting Principles	Retained Earnings	Retained Earnings Cumulative-effect of Changes in Accounting Principles	AOCI	AOCI Cumulative-effect of Changes in Accounting Principles	Total Shareholders' Equity	Total Shareholders' Equity Cumulative-effect of Changes in Accounting Principles	Noncontrolling Interests	Noncontrolling Interests Cumulative-effect of Changes in Accounting Principles	Noncontrolling Interests Common Units
Beginning balance at Dec. 31, 2017	$ 19,370	$ 6			$ 9,865	$ (127)	$ 7,936	$ 1,029	$ (659)	$ (1,023)	$ 17,142	$ (121)	$ 2,228	$ 127
Beginning balance (in shares) at Dec. 31, 2017					645,000,000
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Net income (loss) including noncontrolling interests	$ 2,549						2,447				2,447		102
Issuance of stock	2,461				$ 2,461						2,461
Issuance of stock (in shares)					36,000,000
Sale of Dominion Energy Midstream common units—net of offering costs			$ 4												$ 4
Remeasurement of noncontrolling interest in Dominion Energy Midstream					$ 375						375		(375)
Stock repurchases (in shares)					0
Stock awards (net of change in unearned compensation)	22				$ 22						22
Common dividends and distributions	(2,331)						(2,185)				(2,185)		(146)
Other comprehensive income (loss), net of tax	(17)								(18)		(18)		1
Other	(16)				(8)		(8)				(16)
Ending balance at Dec. 31, 2018	22,048				$ 12,588		9,219		(1,700)		20,107		1,941
Ending Balance (in shares) at Dec. 31, 2018					681,000,000
Net income (loss) including noncontrolling interests	1,376						1,358				1,358		18
Issuance of stock	$ 5,401			$ 2,387	$ 3,014						5,401
Issuance of stock (in shares)	6,100,000			2,000,000	39,000,000
Stock purchase contract component of 2019 Equity Units	$ (264)				$ (264)						(264)
Acquisition of SCANA	6,818				$ 6,818						6,818
Acquisition of SCANA (in shares)					96,000,000
Acquisition of public interest in Dominion Energy Midstream	(40)				$ 1,181						1,181		(1,221)
Acquisition of public interest in Dominion Energy Midstream (in shares)					22,000,000
Sale of interest in Cove Point	1,862				$ 476						476		1,386
Stock repurchases (in shares)					0
Stock awards (net of change in unearned compensation)	24				$ 24						24
Preferred stock dividends (See Note 19)	(17)						(17)				(17)
Common dividends and distributions	(3,068)						(2,983)				(2,983)		(85)
Other comprehensive income (loss), net of tax	(93)								(93)		(93)
Other	(14)				(13)		(1)				(14)
Ending balance at Dec. 31, 2019	$ 34,033	$ (48)		$ 2,387	$ 23,824		7,576	$ (48)	(1,793)		31,994	$ (48)	2,039
Ending 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	$ (550)						(401)				(401)		(149)
Issuance of stock	481				$ 481						481
Issuance of stock (in shares)					7,000,000
Stock repurchases	(3,080)				$ (3,080)						(3,080)
Stock repurchases (in shares)					(38,900,000)
Stock awards (net of change in unearned compensation)	29				$ 29						29
Preferred stock dividends (See Note 19)	(65)						(65)				(65)
Common dividends and distributions	(3,037)						(2,873)				(2,873)		(164)
Other comprehensive income (loss), net of tax	76								76		76
GT&S Transaction closing	(1,367)				17						17		(1,384)
Other	(11)				(13)						(13)		2
Ending balance at Dec. 31, 2020	$ 26,461			$ 2,387	$ 21,258		$ 4,189		$ (1,717)		$ 26,117		$ 344
Ending Balance (in shares) at Dec. 31, 2020				2,000,000	806,000,000