Significant Accounting Policies (Schedule of Supplemental Cash Flow Information) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Significant noncash investing and financing activities:
Accrued capital expenditures	[1]	$ 753	$ 671
Leases	[2]	161	117
Virginia Electric and Power Company
Significant noncash investing and financing activities:
Accrued capital expenditures		566	460
Leases	[3]	$ 142	$ 99

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

[2] Includes $26 million and $32 million of financing leases at March 31, 2024 and 2023, respectively, and $135 million and $85 million of operating leases at March 31, 2024 and 2023, respectively.

[3] Includes $22 million and $31 million of financing leases at March 31, 2024 and 2023, respectively, and $120 million and $68 million of operating leases at March 31, 2024 and 2023, respectively.