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Significant Accounting Policies (Schedule of Supplemental Cash Flow Information) (Detail) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Significant noncash investing and financing activities: |  |  |
Accrued capital expenditures | [1] | $ 871 | $ 929
Leases | [1],[2] | 37 | 196
Virginia Electric and Power Company |  |  |
Significant noncash investing and financing activities: |  |  |
Accrued capital expenditures |  | 685 | 749
Leases | [3] | $ 29 | $ 171
[1] | See Note 3 for noncash financing activities related to debt assumed with the closing of the East Ohio and Questar Gas Transactions.
[2] | Includes $25 million and $51 million of financing leases at June 30, 2025 and 2024, respectively, and $12 million and $145 million of operating leases at June 30, 2025 and 2024, respectively.
[3] | Includes $22 million and $42 million of financing leases at June 30, 2025 and 2024, respectively, and $7 million and $129 million of operating leases at June 30, 2025 and 2024, respectively.

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