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Operating Segments - Dominion Energy (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Asset early retirement expense |  |  |  |  |  |  | $ 114.0 | $ 134.0 |
Charge associated with the sale of Fowler Ridge, net of tax |  |  |  | $ 170.0 |  |  |  |  |
Charge for expected CCRO, net of tax |  |  |  | 149.0 |  |  |  |  |
Charges associated with legislation enacted related to customer arrears, net of tax |  |  | $ 94.0 |  |  |  |  |  |
Gain loss on investments |  |  |  |  |  |  | 412.0 | 626.0 | $ (102.0)
2017 Tax Reform Act |  |  |  |  |  |  | 0.0 | 0.0 | 46.0
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Asset early retirement expense |  |  |  |  |  |  | 85.0 | 81.0 |
Charge for expected CCRO, net of tax |  |  |  | $ 149.0 |  |  |  |  |
Charges associated with legislation enacted related to customer arrears, net of tax |  |  | $ 94.0 |  |  |  |  |  |
2017 Tax Reform Act |  |  |  |  |  |  | 0.0 | 0.0 | 21.0
Payment for contract termination |  |  |  |  |  |  |  | 135.0 |
Payment for contract termination after tax |  |  |  |  |  |  |  | 100.0 |
SCANA |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Litigation settlement, amount received from SCANA | $ 32.5 | $ 192.5 |  |  |  |  |  |  |
Merger and integration-related costs |  |  |  |  |  | $ 1,300.0 |  | 427.0 |
Merger and integration-related costs, after tax |  |  |  |  |  |  |  | 320.0 |
Charge related to a voluntary retirement program |  |  |  |  |  |  |  | 394.0 |
Charge related to a voluntary retirement program, after-tax |  |  |  |  |  |  |  | 295.0 |
Electric Generation Facilities |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Asset early retirement expense after tax |  |  |  |  | $ 566.0 |  |  |  |
Electric Generation Facilities | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Asset early retirement expense after tax |  |  |  |  | $ 561.0 |  |  |  |
Operating Segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
After-tax net expense (income) |  |  |  |  |  |  | 1,200.0 | 1,900.0 | 196.0
Operating Segments | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
After-tax net expense (income) |  |  |  |  |  |  | 863.0 |  |
Asset early retirement expense after tax |  |  |  |  |  |  | 559.0 | 257.0 |
Charge for expected CCRO |  |  |  |  |  |  | 130.0 |  |
Charge for expected CCRO, net of tax |  |  |  |  |  |  | 97.0 |  |
Charges associated with legislation enacted related to customer arrears |  |  |  |  |  |  | 127.0 |  |
Charges associated with legislation enacted related to customer arrears, net of tax |  |  |  |  |  |  | 94.0 |  |
Charge related to a voluntary retirement program |  |  |  |  |  |  |  | 198.0 |
Charge related to a voluntary retirement program, after-tax |  |  |  |  |  |  |  | 146.0 |
Benefit from revision of future closure costs |  |  |  |  |  |  |  | 113.0 |
Benefit from revision of future closure costs, after tax |  |  |  |  |  |  |  | 84.0 |
One-time rate credit amount |  |  |  |  |  |  |  |  | 215.0
One-time rate credit amount after tax |  |  |  |  |  |  |  |  | 160.0
Charge associated with major storm damage and service restoration |  |  |  |  |  |  |  |  | 70.0
Charge associated with major storm damage and service restoration, after tax |  |  |  |  |  |  |  |  | 52.0
Operating Segments | Virginia Electric and Power Company | Virginia Regulation |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Charge associated with asset retirement obligations for ash ponds and landfills at certain utility generation facilities |  |  |  |  |  |  |  |  | 81.0
Environmental remediation expense net of tax |  |  |  |  |  |  |  |  | 60.0
Operating Segments | Nuclear Decommissioning Trust Funds |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Gain loss on investments |  |  |  |  |  |  | 335.0 | 553.0 | 170.0
Gain loss on investments, net of tax |  |  |  |  |  |  | 264.0 | 411.0 | 134.0
Corporate and Other | Operating Segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
After-tax net expense (income) |  |  |  |  |  |  | 3,700.0 | 1,800.0 | (117.0)
After- tax net expense (income) for specific items |  |  |  |  |  |  | 3,400.0 | 1,500.0 | (322.0)
Corporate and Other | Operating Segments | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
After-tax net expense (income) |  |  |  |  |  |  | 863.0 | 634.0 | 312.0
After- tax net expense (income) for specific items |  |  |  |  |  |  | 915.0 | 627.0 | 312.0
Dominion Energy Virginia | Virginia Legislation |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Benefit from revision of future closure costs |  |  |  |  |  |  |  | 113.0 |
Benefit from revision of future closure costs, after tax |  |  |  |  |  |  |  | 84.0 |
Dominion Energy Virginia | SCANA |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Charge related to a voluntary retirement program, after-tax |  |  |  |  |  |  |  | 151.0 |
Dominion Energy Virginia | Automated Meter Reading Program |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Asset early retirement expense |  |  |  |  |  |  |  | 160.0 |
Asset early retirement expense after tax |  |  |  |  |  |  |  | 119.0 |
Dominion Energy Virginia | Operating Segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Charge for expected CCRO |  |  |  |  |  |  | 130.0 |  |
Charge for expected CCRO, net of tax |  |  |  |  |  |  | 97.0 |  |
Charges associated with legislation enacted related to customer arrears |  |  |  |  |  |  | 127.0 |  |
Charges associated with legislation enacted related to customer arrears, net of tax |  |  |  |  |  |  | 94.0 |  |
Charge associated with major storm damage and service restoration |  |  |  |  |  |  |  |  | 70.0
Charge associated with major storm damage and service restoration, after tax |  |  |  |  |  |  |  |  | 52.0
Dominion Energy Virginia | Operating Segments | Virginia Legislation |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
One-time rate credit amount |  |  |  |  |  |  |  |  | 215.0
One-time rate credit amount after tax |  |  |  |  |  |  |  |  | 160.0
Dominion Energy Virginia | Operating Segments | Virginia Regulation |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Charge associated with asset retirement obligations for ash ponds and landfills at certain utility generation facilities |  |  |  |  |  |  |  |  | 81.0
Environmental remediation expense net of tax |  |  |  |  |  |  |  |  | 60.0
Dominion Energy Virginia | Operating Segments | Nuclear Decommissioning Trust Funds |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Gain loss on investments, net of tax |  |  |  |  |  |  | 27.0 | 49.0 | 14.0
Dominion Energy Virginia | Operating Segments | Electric Generation Facilities |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Asset early retirement expense |  |  |  |  |  |  | 751.0 | 346.0 |
Asset early retirement expense after tax |  |  |  |  |  |  | 564.0 | 257.0 |
Contracted Assets | SCANA |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Charge related to a voluntary retirement program, after-tax |  |  |  |  |  |  |  | 38.0 |
Contracted Assets | Operating Segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Charge associated with certain merchant solar generation facilities |  |  |  |  |  |  | 405.0 |  |
Charge associated with certain merchant solar generation facilities, net of tax |  |  |  |  |  |  | 325.0 |  |
Charge associated with the sale of Fowler Ridge |  |  |  |  |  |  | 221.0 |  |
Charge associated with the sale of Fowler Ridge, net of tax |  |  |  |  |  |  | 171.0 |  |
Benefit associated with sale of certain merchant generation facilities |  |  |  |  |  |  |  |  | 282.0
Benefit associated with sale of certain merchant generation facilities, after tax |  |  |  |  |  |  |  |  | 229.0
Contracted Assets | Operating Segments | Nuclear Decommissioning Trust Funds |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Gain loss on investments, net of tax |  |  |  |  |  |  | 237.0 | 362.0 | $ 120.0
Dominion Energy South Carolina Inc | SCANA |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Charge for refund of amounts from customers, current |  |  |  |  |  | $ 137.0 |  |  |
Charge for refund of amounts from customers, after tax |  |  |  |  |  |  |  | 756.0 |
Dominion Energy South Carolina Inc | SCANA | NND Project |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
2017 Tax Reform Act |  |  |  |  |  |  |  | 194.0 |
Income tax regulatory assets |  | 258.0 |  |  |  |  |  | 258.0 |
Dominion Energy South Carolina Inc | Operating Segments |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Litigation settlement, amount received from SCANA |  |  |  |  |  |  | 117.0 | 641.0 |
Litigation settlement expense, after tax |  |  |  |  |  |  | $ 93.0 | 480.0 |
Charge for refund of amounts from customers, current |  | $ 1,000.0 |  |  |  |  |  | 1,000.0 |
Charge for refund of amounts from customers, after tax |  |  |  |  |  |  |  | 756.0 |
Charge related to a voluntary retirement program, after-tax |  |  |  |  |  |  |  | 75.0 |
Charge for property, plant and equipment acquired but committed to forgo recovery |  |  |  |  |  |  |  | 114.0 |
Charge for property, plant and equipment acquired but committed to forgo recovery, after tax |  |  |  |  |  |  |  | 86.0 |
Gas Distribution | SCANA |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |
Charge related to a voluntary retirement program, after-tax |  |  |  |  |  |  |  | $ 56.0 |

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