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Operating Segments - Dominion Energy (Narrative) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |
Asset early retirement expense | $ 129 | $ 165 |
Gain (loss) on investments | (505) | 639 | $ 412
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
After- tax net benefits (expenses) | (2,800) | (493) | (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) | (2,600) | (99) | (3,700)
After- tax net benefits (expenses) for specific items | (2,500) | 97 | (3,400)
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
Gas Distribution | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Benefit (loss) associated with sale of hope | 22 |  |
Benefit (loss) associated with sale of hope after tax | (78) |  |
Contracted Assets | 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 |  | 347 |
Loss related to economic hedging activities, after tax |  | 261 |
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 | 165 |  |
Gain related to economic hedging activities after tax | 133 |  |
Write-off of inventory charge, after tax | 16 |  |
Contracted Assets | Operating Segments | Nuclear Decommissioning Trust Fund |  |  |
Segment Reporting Information [Line Items] |  |  |
Gain (loss) on investments, after tax | $ (393) | $ 390 | $ 237

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