Significant Accounting Policies (Schedule of Supplemental Cash Flow Information) (Detail) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021
Significant noncash investing and financing activities:(1)
Accrued capital expenditures	[1]	$ 745	$ 374
Leases	[2]	129	75
Virginia Electric and Power Company
Significant noncash investing and financing activities:(1)
Accrued capital expenditures		454	238
Leases	[3]	$ 113	$ 59

[1] See Note 10 for noncash investing activities related to the acquisition of a noncontrolling interest in Dominion Privatization and Notes 16 and 17 for noncash financing activities related to the remarketing of Series A Preferred Stock and the issuance of common stock and transfer of property associated with the settlement of litigation.

[2] See Note 10 for noncash investing activities related to the acquisition of a noncontrolling interest in Dominion Privatization and Notes 16 and 17 for noncash financing activities related to the remarketing of Series A Preferred Stock and the issuance of common stock and transfer of property associated with the settlement of litigation.

[3] Includes $20 million and $24 million of financing leases at September 30, 2022 and 2021, respectively, and $93 million and $35 million of operating leases at September 30, 2022 and 2021, respectively