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Derivatives and Hedge Accounting Activities (Schedule of Offsetting Liabilities) (Parenthetical) (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
Derivative liabilities, not subject to a master netting or similar arrangement | $ 4 | $ 7
Virginia Electric and Power Company |  |
Offsetting Liabilities [Line Items] |  |
Derivative liabilities, not subject to a master netting or similar arrangement | $ 10 | $ 17

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