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Operating Segments - Virginia Power (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |  |
Charge for RGGI compliance cost, after tax | $ 134 |  |  |
Charge in connection with comprehensive settlement agreement for fuel expenses, after-tax | 142 |  |  |
Gain (loss) on investments |  | $ 474 | $ (505) | $ 639
Charge for the write-off of certain previously deferred amounts |  | 307 | 1,401 | 194
Virginia Electric and Power Company |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Charge for RGGI compliance cost, after tax | 134 |  |  |
Charge in connection with comprehensive settlement agreement for fuel expenses, after-tax | $ 142 |  |  |
Gain (loss) on investments |  | 68 | (66) | 81
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 expenses |  | 405 | (2,400) | (316)
Charge associated with storm damage and service restoration |  |  | 125 |
Charge associated with storm damage and service restoration, after tax |  |  | 93 |
Gain (loss) on investments |  | 411 | (559) | 568
Gain (loss) on investments, after tax |  | $ 305 | $ (451) | $ 445
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] |  |  |  |
Charges associated with budget process related to customer arrears |  |  |  | $ 77
Charges associated with budget process related to customer arrears, after tax |  |  |  | 57
Charge associated with storm damage and service restoration |  |  | $ 117 | 68
Charge associated with storm damage and service restoration, after tax |  |  | 87 | 50
Loss from unbilled revenue reduction |  |  |  | 151
Loss from unbilled revenue reduction, after tax |  |  |  | 112
Net charge associated with settlement of the 2021 Triennial Review |  |  |  | 125
Net charge associated with settlement of the 2021 Triennial Review, after tax |  |  |  | 93
Easement charge related to CVOW Commercial Project |  | $ 65 |  |
Easement charge related to CVOW Commercial Project, after tax |  | 48 |  |
Amortization of regulatory asset |  | 244 | 243 | 61
Amortization of regulatory asset after tax |  | 182 | 181 | 45
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 |  | 59 | (78) |
Gain (loss) on investments, after tax |  | $ 43 | $ (58) |
Investment, Type [Extensible Enumeration] |  | Nuclear Decommissioning Trust Fund [Member] | Nuclear Decommissioning Trust Fund [Member] |
Charges for Dismantling cost |  |  | $ 167 |
Charges for Dismantling cost, after tax |  |  | 124 |
Benefit for change in CCRO reserve |  |  |  | 130
Benefit for change in CCRO reserve, after tax |  |  |  | 97
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 |  |
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 expenses |  | (166) | (1,300) | 873
After- tax net expenses for specific items |  | 251 | (1,300) | 991
Operating Segments | Corporate and Other | Virginia Electric and Power Company |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
After- tax net expenses |  | (232) | (793) | (201)
After- tax net expenses for specific items |  | $ (232) | $ (773) | $ (201)

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