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Operating Segments - Virginia Power (Narrative) (Detail) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments | $ 442 | $ 589
Virginia Electric and Power Company |  |
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments | 65 | 85
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | 81 | 76
Gain (loss) on investments | 415 | 515
Gain (loss) on investments, after tax | 255 | $ 323
Investment, Type [Extensible Enumeration] |  | Nuclear Decommissioning Trust Fund [Member]
Operating Segments | Corporate and Other |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | (108) | $ (272)
After- tax net benefits (expenses) for specific items | 58 | 12
Operating Segments | Virginia Electric and Power Company |  |
Segment Reporting Information [Line Items] |  |
Loss associated with severe weather events | 106 |
Loss associated with severe weather events, after-tax | 79 |
Share of costs not expected to be recovered from customers on the CVOW commercial project | 112 |
Share of costs not expected to be recovered from customers on the CVOW commercial project, after tax | 84 |
Gain (loss) on investments | 59 | 74
Gain (loss) on investments, after tax | $ 34 | $ 45
Investment, Type [Extensible Enumeration] | Nuclear Decommissioning Trust Fund [Member] | Nuclear Decommissioning Trust Fund [Member]
Charge related to write-off of certain early stage development costs |  | $ 30
Charge related to write-off of certain early stage development costs after tax |  | 22
Operating Segments | Virginia Electric and Power Company | Corporate and Other |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | $ (101) | 17
After- tax net benefits (expenses) for specific items | $ (127) | $ 15

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