Earnings Per Share (Calculation of Basic and Diluted EPS) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Net income attributable to Dominion Energy from continuing operations										$ 1,927	$ 2,156	$ 269	[1]
Preferred stock dividends (See Note 19)										(68)	(81)	(93)	[1]
Preferred stock deemed dividends (See Note 19)										(10)	0	0	[1]
Net income attributable to Dominion Energy from continuing operations - Basic										1,849	2,075	176	[1]
Dilutive effect of 2019 Equity Units	[1]									0	0	0
Net income attributable to Dominion Energy from continuing operations - Diluted										1,849	2,075	176	[1]
Net income (loss) attributable to Dominion Energy from discontinued operations - Basic & Diluted										$ 197	$ (125)	$ 922	[1]
Average shares of common stock outstanding – Basic										839.2	836.4	823.9	[1]
Net effect of dilutive securities	[2]									0.2	0.1	0.9	[1]
Average shares of common stock outstanding – Diluted										839.4	836.5	824.8	[1]
EPS from continuing operations - Basic		$ 0.15	$ 1.14	$ 0.54	$ 0.36	$ 0.41	$ 0.81	$ 0.46	$ 0.8	$ 2.2	$ 2.48	$ 0.22	[1]
EPS from discontinued operations - Basic		0	(0.02)	0.12	0.14	(0.04)	(0.65)	0.2	0.34	0.24	(0.15)	1.11	[1]
Net income attributable to Dominion Energy		0.15	1.12	0.66	0.50	0.37	0.16	0.66	1.14	2.44	2.33	1.33	[1]
EPS from continuing operations - Diluted		0.15	1.14	0.54	0.36	0.41	0.81	0.46	0.8	2.2	2.48	0.22	[1]
EPS from discontinued operations - Diluted		0	(0.02)	0.12	0.14	(0.04)	(0.65)	0.2	0.34	0.24	(0.15)	1.11	[1]
Net income attributable to Dominion Energy		$ 0.15	$ 1.12	$ 0.66	$ 0.5	$ 0.37	$ 0.16	$ 0.66	$ 1.14	$ 2.44	$ 2.33	$ 1.33	[1]

[1] As discussed in Note 19, effective in June 2022 through its redemption in September 2022, the Series A Preferred Stock was considered to be mandatorily redeemable and was classified in current liabilities.

[2] Dilutive securities for 2024 consists of certain of the forward sales agreements entered into in 2024 with certain of these securities settling in 2024 (applying the treasury stock method). Dilutive securities for 2023 and 2022 consist primarily of stock potentially to be issued to satisfy the obligation under a settlement agreement with the SCDOR (applying the if converted method). Additionally, in 2022, dilutive securities include forward sales agreements entered into in November 2021 and settled in December 2022 (applying the treasury stock method). See Notes 20 and 23 for additional information.