Earnings Per Share (Calculation of Basic and Diluted EPS) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Net income attributable to Dominion Energy from continuing operations		$ 491	$ 415	$ 1,051	$ 1,115
Preferred stock dividends (see Note 16)		(19)	(20)	(39)	(40)
Preferred stock deemed dividends (see Note 16)		(9)	0	(9)	0
Net income attributable to Dominion Energy from continuing operations - Basic		463	395	1,003	1,075
Net income attributable to Dominion Energy from continuing operations - Diluted		463	395	1,003	1,075
Net income (loss) attributable to Dominion Energy		$ 81	$ 168	$ 195	$ 449
Average shares of common stock outstanding – Basic		838.3	836.0	838.0	835.6
Net effect of dilutive securities	[1]	0.0	0.2	0.0	0.3
Average shares of common stock outstanding – Diluted		838.3	836.2	838.0	835.9
EPS from continuing operations – Basic		$ 0.55	$ 0.47	$ 1.2	$ 1.28
EPS from discontinued operations – Basic		0.1	0.2	0.23	0.54
Net income attributable to Dominion Energy		0.65	0.67	1.43	1.82
EPS from continuing operations – Diluted		0.55	0.47	1.2	1.28
EPS from discontinued operations – Diluted		0.1	0.2	0.23	0.54
Net income attributable to Dominion Energy		$ 0.65	$ 0.67	$ 1.43	$ 1.82

[1] Certain of the forward sales agreements entered into in the second quarter of 2024 are considered dilutive securities but have an inconsequential impact for the three and six months ended June 30, 2024 (applying the treasury stock method). Dilutive securities for the three and six months ended June 30, 2023 include stock potentially to be issued to satisfy the obligation under a settlement agreement with the SCDOR (applying the if converted method). See Notes 16 and 17 for additional information.