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Operating Segments - Virginia Power (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments | $ (116) | $ 294
Virginia Electric and Power Company |  |
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments | (11) | 39
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | (151) | 124
Gain (loss) on investments | (132) | 266
Gain (loss) on investments, after tax | $ (95) | $ 202
Investment, Type [Extensible Enumeration] | Nuclear Decommissioning Trust Fund [Member] | Nuclear Decommissioning Trust Fund [Member]
Operating Segments | Corporate and Other |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | $ (176) | $ (185)
After- tax net benefits (expenses) for specific items | (157) | (44)
Operating Segments | Virginia Electric and Power Company |  |
Segment Reporting Information [Line Items] |  |
Loss associated with severe weather events | 82 |
Loss associated with severe weather events, after-tax | 61 |
Share of costs not expected to be recovered from customers on the CVOW commercial project | 23 |
Share of costs not expected to be recovered from customers on the CVOW commercial project, after tax | 17 |
Gain (loss) on investments | (14) | 37
Gain (loss) on investments, after tax | $ (11) | $ 27
Investment, Type [Extensible Enumeration] | Nuclear Decommissioning Trust Fund [Member] | Nuclear Decommissioning Trust Fund [Member]
Operating Segments | Virginia Electric and Power Company | Corporate and Other |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | $ (79) | $ 41
After- tax net benefits (expenses) for specific items | $ (88) | $ 39

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