Operating Segments (Schedule of Segment Reporting Information, by Segment) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Operating Revenue		$ 3,486	$ 3,166	$ 7,118	$ 7,049
Net Income from discontinued operations including noncontrolling interest	[1]	81	168	195	449
Net income (loss) attributable to Dominion Energy		572	583	1,246	1,564
Operating Segments
Segment Reporting Information [Line Items]
Total revenue from external customers		3,486	3,166	7,118	7,049
Adjustments & Eliminations
Segment Reporting Information [Line Items]
Net Income from discontinued operations including noncontrolling interest		0	0	0	0
Net income (loss) attributable to Dominion Energy		0	0	0	0
Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue		0	0	0	0
Adjustments & Eliminations
Segment Reporting Information [Line Items]
Operating Revenue		(264)	(236)	(501)	(472)
Eliminations
Segment Reporting Information [Line Items]
Total revenue from external customers		0	0	0	0
Operating Revenue		(264)	(236)	(501)	(472)
Dominion Energy Virginia | Operating Segments
Segment Reporting Information [Line Items]
Total revenue from external customers		2,537	2,253	5,026	4,637
Operating Revenue		2,537	2,252	5,026	4,636
Net Income from discontinued operations including noncontrolling interest		0	0	0	0
Net income (loss) attributable to Dominion Energy		485	394	909	780
Dominion Energy Virginia | Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue		0	(1)	0	(1)
Dominion Energy South Carolina | Operating Segments
Segment Reporting Information [Line Items]
Total revenue from external customers		758	771	1,650	1,615
Operating Revenue		762	773	1,655	1,618
Net Income from discontinued operations including noncontrolling interest		0	0	0	0
Net income (loss) attributable to Dominion Energy		69	68	149	159
Dominion Energy South Carolina | Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue		4	2	5	3
Contracted Energy | Operating Segments
Segment Reporting Information [Line Items]
Total revenue from external customers		281	126	587	434
Operating Revenue		284	131	592	442
Net Income from discontinued operations including noncontrolling interest		0	0	0	0
Net income (loss) attributable to Dominion Energy		100	(45)	222	66
Contracted Energy | Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue		3	5	5	8
Corporate and Other | Operating Segments
Segment Reporting Information [Line Items]
Total revenue from external customers		(90)	16	(145)	363
Operating Revenue		167	246	346	825
Net Income from discontinued operations including noncontrolling interest		81	168	195	449
Net income (loss) attributable to Dominion Energy		(82)	166	(34)	559
Corporate and Other | Intersegment revenue
Segment Reporting Information [Line Items]
Operating Revenue		$ 257	$ 230	$ 491	$ 462

[1] Includes income tax expense (benefit) of $(19) million and $38 million for the three months ended June 30, 2024 and 2023, respectively, and $32 million and $94 million for the six months ended June 30, 2024 and 2023, respectively.