Significant Accounting Policies (Schedule of Supplemental Cash Flow Information) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Supplemental Cash Flow Information [Line Items]
Interest and related charges, excluding capitalized amounts		$ 1,991	$ 1,408	$ 1,340
Income taxes		286	139	160
Significant noncash investing and financing activities:
Accrued capital expenditures	[1],[2]	1,085	979	637
Leases	[3]	255	144	96
Virginia Electric and Power Company
Schedule Of Supplemental Cash Flow Information [Line Items]
Interest and related charges, excluding capitalized amounts		709	599	501
Income taxes		(47)	(54)	109
Significant noncash investing and financing activities:
Accrued capital expenditures		807	665	363
Leases	[4]	$ 203	$ 116	$ 79

[1] See Note 9 for noncash investing activities related to the acquisition of a noncontrolling interest in Wrangler and Dominion Privatization.

[2] See Notes 18, 19, 20 and 23 for noncash financing activities related to the contribution of stock to Dominion Energy’s defined benefit pension plan, remarketing of Series A Preferred Stock and the issuance of common stock and transfer of property associated with the settlement of litigation.

[3] Includes $44 million of finance leases and $211 million of operating leases entered in 2023, $34 million of finance leases and $110 million of operating leases entered in 2022 and $47 million of finance leases and $49 million of operating leases entered in 2021.

[4] Includes $30 million of finance leases and $173 million of operating leases entered in 2023, $26 million of finance leases and $90 million of operating leases entered in 2022 and $37 million of finance leases and $42 million of operating leases entered in 2021.