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Accumulated Other Comprehensive Income (Loss) (Schedule of Changes in AOCI Net of Tax and Reclassifications out of AOCI by Component) (Parenthetical) (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Total Derivative-Hedging Activities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amount of tax | $ 57 | $ 58 | $ 58 | $ 64 | $ 64 | $ 73
Total Derivative-Hedging Activities | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amount of tax | (7) | (8) | (10) | (6) | (8) | (5)
Investment Securities |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amount of tax | (5) | 0 | 9 | (8) | 6 | (1)
Investment Securities | Virginia Electric and Power Company |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amount of tax | 0 | 1 | 1 | (2) | 1 | 1
Pension and Other Postretirement Benefit Costs |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Amount of tax | $ (7) | $ (8) | $ (9) | $ (10) | $ (11) | $ (14)

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