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Significant Accounting Policies (Schedule of Supplemental Cash Flow Information) (Detail) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Significant noncash investing and financing activities: |  |  |
Accrued capital expenditures | [1] | $ 891 | $ 930
Leases | [1],[2] | 315 | 183
Virginia Electric and Power Company |  |  |
Significant noncash investing and financing activities: |  |  |
Accrued capital expenditures |  | 727 | 738
Leases | [3] | $ 317 | $ 156
[1] | See Note 3 for noncash financing activities related to debt assumed with the closing of the East Ohio, Questar Gas and PSNC Transactions.
[2] | Includes $281 million and $100 million of financing leases entered in during the nine months ended September 30, 2025 and 2024, respectively, and $34 million and $83 million of operating leases entered in during the nine months ended September 30, 2025 and 2024, respectively.
[3] | Includes $62 million and $89 million of financing leases entered in during the nine months ended September 30, 2025 and 2024, respectively, and $255 million and $67 million of operating leases entered in during the nine months ended September 30, 2025 and 2024, respectively. Property, Plant and Equipment Virginia Power recorded a $25 million ($18 million after-tax) charge during the third quarter of 2024 within impairment of assets and other charges in its Consolidated Statements of Income related to the write-off of early-stage development costs associated with a hydroelectric pumped storage facility that it is no longer considering constructing.

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