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Operating Segments - Dominion Energy (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |  |  |
Asset early retirement expense |  |  |  | $ 125 | $ 155 |
Charges associated with impairment of nonregulated solar generation facilities net of tax | $ 1,100 |  |  |  |  |
Gain (loss) on investments |  |  |  | (505) | 639 | $ 412
Loss associated with sale of Kewaunee, after tax |  | $ 513 |  |  |  |
Charge for RGGI compliance cost, after tax |  | 134 |  |  |  |
Charge in connection with comprehensive settlement agreement for fuel expenses, after-tax |  | $ 142 |  |  |  |
Charges associated with the settlement of the South Carolina electric base rate case, after tax |  |  | $ 199 |  |  |
Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
After- tax net benefits (expenses) |  |  |  | (2,900) | (485) | (1,200)
Charge associated with storm damage and service restoration |  |  |  | 125 |  |
Charge associated with storm damage and service restoration, after tax |  |  |  | 93 |  |
Write-off of inventory charge |  |  |  | 40 |  |
Write-off of inventory charge, after tax |  |  |  | 30 |  |
Operating Segments | Nuclear Decommissioning Trust Fund |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gain (loss) on investments |  |  |  | 559 | 568 | 335
Gain (loss) on investments, after tax |  |  |  | 451 | 445 | 264
Corporate and Other | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
After- tax net benefits (expenses) |  |  |  | (1,700) | 705 | (2,900)
After- tax net benefits (expenses) for specific items |  |  |  | (1,700) | 821 | (2,700)
Dominion Energy South Carolina Inc | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Litigation settlement expense |  |  |  |  | 70 | 117
Litigation settlement expense, after tax |  |  |  |  | 53 | 93
Charges associated with the settlement of the South Carolina electric base rate case |  |  |  |  | 266 |
Charges associated with the settlement of the South Carolina electric base rate case, after tax |  |  |  |  | 199 |
Dominion Energy Virginia | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Charge for expected CCRO |  |  |  |  |  | 130
Charge for expected CCRO, net of tax |  |  |  |  |  | 97
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 |  |
Benefit for change in expected CCRO reserve |  |  |  |  | 130 |
Benefit for change in expected CCRO reserve, after tax |  |  |  |  | 97 |
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 |  |  |  |  | 68 |
Charge associated with storm damage and service restoration, after tax |  |  |  | 87 | 50 |
Amortization of regulatory asset |  |  |  | 243 | 61 |
Amortization of regulatory asset after tax |  |  |  | 181 | 45 |
Charges for Dismantling cost |  |  |  | 167 |  |
Charges for Dismantling cost, after tax |  |  |  | 124 |  |
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 |
Charges associated with legislation enacted related to customer arrears |  |  |  |  |  | 127
Charges associated with legislation enacted related to customer arrears, net of tax |  |  |  |  |  | 94
Write-off of inventory charge, after tax |  |  |  | 14 |  |
Dominion Energy Virginia | Operating Segments | Nuclear Decommissioning Trust Fund |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gain (loss) on investments, after tax |  |  |  | (58) | 55 | 27
Dominion Energy Virginia | Operating Segments | Electric Generation Facilities |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Asset early retirement expense |  |  |  |  |  | 751
Asset early retirement expense after tax |  |  |  |  |  | 564
Contracted Energy | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Charges associated with impairment of nonregulated solar generation facilities |  |  |  | 1,500 |  |
Charges associated with impairment of nonregulated solar generation facilities net of tax |  |  |  | 1,100 |  |
Charge associated with the sale of Fowler Ridge |  |  |  |  |  | 221
Charge associated with the sale of Fowler Ridge, net of tax |  |  |  |  |  | 171
Loss associated with sale of Kewaunee |  |  |  | 649 |  |
Loss associated with sale of Kewaunee, after tax |  |  |  | 513 |  |
Loss related to economic hedging activities |  |  |  |  | 337 |
Loss related to economic hedging activities, after tax |  |  |  |  | 254 |
Net loss on the sale of non-wholly-owned nonregulated solar facilities |  |  |  |  | 211 |
Net loss on the sale of non-wholly-owned nonregulated solar facilities after tax |  |  |  |  | 161 |
Charge associated with storm damage and service restoration, after tax |  |  |  | 6 |  |
Charge associated with revision in estimated recovery of spent nuclear fuel costs associated with the decommissioning of Kewaunee |  |  |  |  | 44 |
Charge associated with revision in estimated recovery of spent nuclear fuel costs associated with the decommissioning of Kewaunee, after tax |  |  |  |  | 35 |
Charge associated with certain nonregulated solar generation facilities |  |  |  |  |  | 405
Charge associated with certain nonregulated solar generation facilities, net of tax |  |  |  |  |  | 325
Gain related to economic hedging activities |  |  |  | 67 |  |
Gain related to economic hedging activities after tax |  |  |  | 49 |  |
Write-off of inventory charge, after tax |  |  |  | 16 |  |
Contracted Energy | Operating Segments | Nuclear Decommissioning Trust Fund |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gain (loss) on investments, after tax |  |  |  | $ 393 | $ 390 | $ 237

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