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Operating Segments - Virginia Power (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments | $ 294 | $ 134
Virginia Electric and Power Company |  |
Segment Reporting Information [Line Items] |  |
Gain (loss) on investments | 39 | 19
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
After- tax net benefits (expenses) | 124 | 304
Gain (loss) on investments | 266 | 123
Gain (loss) on investments, after tax | $ 202 | $ 90
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) | $ 48 | $ 393
After- tax net benefits (expenses) for specific items | 191 | 466
Operating Segments | Virginia Electric and Power Company |  |
Segment Reporting Information [Line Items] |  |
Charge for amortization of a regulatory asset, 2021 Triennial Review |  | 61
Charge for amortization of a regulatory asset, 2021 Triennial Review, after tax |  | 45
Gain (loss) on investments | 37 |
Gain (loss) on investments, after tax | $ 27 |
Investment, Type [Extensible Enumeration] | 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) | $ 41 | (31)
After- tax net benefits (expenses) for specific items | $ 39 | $ (32)

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