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Operating Segments - Virginia Power (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |  |  |
Gain (loss) on investments |  |  | $ 669 | $ 474 | $ (505)
Gain (loss) on investments, after tax | $ 132 | $ 202 |  |  |
Investment, Type [Extensible Enumeration] | Nuclear Decommissioning Trust Fund [Member] | Nuclear Decommissioning Trust Fund [Member] |  |  |
Charge for the write-off of certain previously deferred amounts |  |  | 600 | 307 | 1,401
Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain (loss) on investments |  |  | 97 | 68 | (66)
Virginia Electric and Power Company | Deferred rider costs for Virginia electric utility |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Charge for the write-off of certain previously deferred amounts |  |  |  | 36 |
Charge for the write-off of certain previously deferred amounts, after tax |  |  |  | 27 |
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
After- tax net income (expenses) |  |  | (132) | 405 | (2,400)
Charge associated with storm damage and service restoration |  |  |  |  | 125
Charge associated with storm damage and service restoration, after tax |  |  |  |  | 93
Gain (loss) on investments |  |  | 565 | 411 | (559)
Gain (loss) on investments, after tax |  |  | $ 434 | $ 305 | $ (451)
Investment, Type [Extensible Enumeration] |  |  | Nuclear Decommissioning Trust Fund [Member] | Nuclear Decommissioning Trust Fund [Member] | Nuclear Decommissioning Trust Fund [Member]
Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Charge associated with storm damage and service restoration |  |  |  |  | $ 117
Charge associated with storm damage and service restoration, after tax |  |  |  |  | 87
Easement charge related to CVOW Commercial Project |  |  |  | $ 65 |
Easement charge related to CVOW Commercial Project, after tax |  |  |  | 48 |
Amortization of regulatory asset |  |  |  | 244 | 243
Amortization of regulatory asset after tax |  |  |  | 182 | 181
Charge for RGGI compliance cost |  |  |  |  | 213
Charge for RGGI compliance cost, after tax |  |  |  |  | 159
Charge in connection with comprehensive settlement agreement for fuel expenses |  |  |  |  | 191
Charge in connection with comprehensive settlement agreement for fuel expenses, after-tax |  |  |  |  | 142
Gain (loss) on investments |  |  | $ 83 | 59 | (78)
Gain (loss) on investments, after tax |  |  | $ 62 | $ 43 | $ (58)
Investment, Type [Extensible Enumeration] |  |  | Nuclear Decommissioning Trust Fund [Member] | Nuclear Decommissioning Trust Fund [Member] | Nuclear Decommissioning Trust Fund [Member]
Share of costs not expected to be recovered from customers on the CVOW commercial project |  |  | $ 103 |  |
Share of costs not expected to be recovered from customers on the CVOW commercial project, after tax |  |  | 77 |  |
Charges for Dismantling cost |  |  | 40 |  | $ 167
Charges for Dismantling cost, after tax |  |  | 30 |  | 124
Charge related to the abandonment of certain regulated solar generation facilities and other facilities |  |  |  | $ 25 |
Charge related to the abandonment of certain regulated solar generation facilities and other facilities, after tax |  |  |  | 19 |
Charge for write-off of certain early stage development costs |  |  | 30 |  |
Charge for write-off of certain early stage development costs after tax |  |  | 22 |  |
Charge associated with an accrual for remediation costs |  |  | 25 |  |
Charge associated with an accrual for remediation costs after tax |  |  | 19 |  |
Operating Segments | Virginia Electric and Power Company | Deferred rider costs for Virginia electric utility |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Charge for the write-off of certain previously deferred amounts |  |  |  | 36 |
Charge for the write-off of certain previously deferred amounts, after tax |  |  |  | 27 |
Operating Segments | Corporate and Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
After- tax net income (expenses) |  |  | (644) | (129) | (1,400)
After- tax net income (expenses) for specific items |  |  | (268) | 316 | (1,500)
Operating Segments | Corporate and Other | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
After- tax net income (expenses) |  |  | (101) | (232) | (793)
After- tax net income (expenses) for specific items |  |  | $ (102) | $ (232) | $ (773)

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