Significant Accounting Policies (Schedule of Supplemental Cash Flow Information) (Detail) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023
Significant noncash investing and financing activities:
Accrued capital expenditures	[1]	$ 929	$ 713
Leases	[2]	196	279
Virginia Electric and Power Company
Significant noncash investing and financing activities:
Accrued capital expenditures		749	550
Leases	[3]	$ 171	$ 242

[1] See Notes 3 and 17 for noncash financing activities related to debt assumed with closing of the East Ohio Transaction and the Questar Gas Transaction and the transfer of property associated with the settlement of litigation.

[2] Includes $51 million and $40 million of financing leases at June 30, 2024 and 2023, respectively, and $145 million and $239 million of operating leases at June 30, 2024 and 2023, respectively.

[3] Includes $42 million and $36 million of financing leases at June 30, 2024 and 2023, respectively, and $129 million and $206 million of operating leases at June 30, 2024 and 2023, respectively.