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Significant Accounting Policies (Schedule of Supplemental Cash Flow Information) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Significant noncash investing and financing activities: |  |  |
Accrued capital expenditures | [1] | $ 1,037 | $ 753
Leases | [1],[2] | 68 | 161
Virginia Electric and Power Company |  |  |
Significant noncash investing and financing activities: |  |  |
Accrued capital expenditures |  | 851 | 566
Leases | [3] | $ 50 | $ 142
[1] | See Note 3 for noncash financing activities related to debt assumed with the closing of the East Ohio Transaction.
[2] | Includes $11 million and $26 million of financing leases at March 31, 2025 and 2024, respectively, and $57 million and $135 million of operating leases at March 31, 2025 and 2024, respectively.
[3] | Includes $9 million and $22 million of financing leases at March 31, 2025 and 2024, respectively, and $41 million and $120 million of operating leases at March 31, 2025 and 2024, respectively.

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