Leases (Summary of Total Lease Cost) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Finance lease cost:
Finance lease cost, Amortization	[1]	$ 54	$ 50	$ 41
Finance lease cost, Interest	[2]	14	13	3
Operating lease cost	[3]	81	70	53
Short-term lease cost	[4]	22	32	31
Variable lease cost		6	6	4
Total lease cost		177	171	132
Virginia Electric and Power Company
Finance lease cost:
Finance lease cost, Amortization	[1]	24	24	15
Finance lease cost, Interest	[2]	5	4	3
Operating lease cost	[3]	60	43	32
Short-term lease cost	[4]	16	23	21
Variable lease cost		2	2	1
Total lease cost		$ 107	$ 96	$ 72

[1] Dominion Energy includes $— million, $3 million and $3 million for the years ended December 31, 2024, 2023 and 2022, respectively, reflected in discontinued operations in its Consolidated Statements of Income.

[2] Dominion Energy includes $— million, $1 million and $1 million for the years ended December 31, 2024, 2023 and 2022, respectively, reflected in discontinued operations in its Consolidated Statements of Income.

[3] Dominion Energy includes $— million, $5 million and $6 million for the years ended December 31, 2024, 2023 and 2022, respectively, reflected in discontinued operations in its Consolidated Statements of Income.

[4] Dominion Energy includes $— million, $2 million and $2 million for the years ended December 31, 2024, 2023 and 2022, respectively, reflected in discontinued operations in its Consolidated Statements of Income.