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Operating Segments - Dominion Energy (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2020 | Dec. 31, 2019 | May 31, 2019 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Asset early retirement expense |  |  |  |  | $ 89.0 |  |  |  |  |
Charge for Expected customer credit reinvestment offset |  |  |  |  |  |  |  | $ 200.0 |  |
Charge for Expected customer credit reinvestment offset, net of tax |  |  |  |  |  |  |  | 149.0 |  |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  |  | $ (36.0) |  | $ (94.0) |  | (223.0) | $ (77.0) |
Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Charge related to a voluntary retirement program |  |  |  |  |  |  |  |  | 197.0 |
Charge related to a voluntary retirement program, after-tax |  |  |  |  |  |  |  |  | 146.0 |
Asset early retirement expense after tax |  |  |  |  |  |  |  |  | 275.0 |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  |  | $ 5.0 |  | (15.0) |  | (36.0) | (29.0) |
Benefit from revision of future closure costs |  |  |  |  |  |  |  |  | 113.0 |
Benefit from revision of future closure costs, after tax |  |  |  |  |  |  |  |  | 84.0 |
Variable Interest Entity (VIE) or Potential VIE, Information Unavailability | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Payment for contract termination |  |  | $ 135.0 |  |  |  | $ 135.0 |  | 135.0 |
Payment for contract termination after tax |  |  |  |  |  |  | $ 100.0 |  | 100.0 |
SCANA |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Merger and integration-related costs |  |  |  |  |  |  |  |  | 408.0 |
Merger and integration-related costs, after tax |  |  |  |  |  |  |  |  | 306.0 |
Charge related to a voluntary retirement program |  |  |  |  |  |  |  |  | 394.0 |
Charge related to a voluntary retirement program, after-tax |  |  |  |  |  |  |  |  | 295.0 |
Litigation settlement expense | $ 32.5 | $ 192.5 |  |  |  |  |  |  |  |
Operating Segments |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
After- tax net expenses |  |  |  |  |  |  |  | 1,300.0 | 1,800.0 |
Charge associated with certain merchant solar generation facilities |  |  |  |  |  |  |  | 405.0 |  |
Charge associated with certain merchant solar generation facilities, net of tax |  |  |  |  |  |  |  | 298.0 |  |
Gain loss on investments held in nuclear decommissioning trust funds |  |  |  |  |  |  |  |  | 364.0 |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  |  |  |  |  |  |  | 272.0 |
Operating Segments | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
After- tax net expenses |  |  |  |  |  |  |  | 815.0 | 653.0 |
Asset early retirement expense after tax |  |  |  |  |  |  |  | 559.0 |  |
Charge for Expected customer credit reinvestment offset |  |  |  |  |  |  |  | 200.0 |  |
Charge for Expected customer credit reinvestment offset, net of tax |  |  |  |  |  |  |  | 149.0 |  |
Operating Segments | Fowler Ridge |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Charge associated with the sale of Fowler Ridge |  |  |  |  |  |  |  | 221.0 |  |
Charge associated with the sale of Fowler Ridge, net of tax |  |  |  |  |  |  |  | 171.0 |  |
Corporate and Other | Operating Segments |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
After- tax net expenses |  |  |  |  |  |  |  | 3,400.0 | 1,700.0 |
Corporate and Other | Operating Segments | Virginia Electric and Power Company |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
After- tax net expenses |  |  |  |  |  |  |  | 815.0 | 673.0 |
Dominion Energy South Carolina Inc | SCANA |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Charge for refund of amounts from customers |  |  |  |  |  | 1,000.0 |  |  | 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 |  |  |  |  |  |  |  |  | 64.0 |
Litigation settlement expense |  |  |  |  |  |  |  |  | 278.0 |
Litigation settlement expense, after tax |  |  |  |  |  |  |  |  | 209.0 |
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 |
Dominion Energy South Carolina Inc | SCANA | NND Project |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Tax benefit resulting from re-measurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  |  |  |  |  |  |  | 198.0 |
Income tax related to regulatory assets acquired |  |  |  |  |  | $ 264.0 |  |  | 264.0 |
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 | 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 | SCANA |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Charge related to a voluntary retirement program, after-tax |  |  |  |  |  |  |  |  | 149.0 |
Dominion Energy Virginia | Operating Segments |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  |  |  |  |  |  |  | 34.0 |
Dominion Energy Virginia | Operating Segments | Electric Generation Facilities |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Asset early retirement expense |  |  |  |  |  |  |  | 751.0 | 369.0 |
Asset early retirement expense after tax |  |  |  |  |  |  |  | $ 564.0 | 275.0 |
Gas Distribution | SCANA |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Charge related to a voluntary retirement program, after-tax |  |  |  |  |  |  |  |  | 55.0 |
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] |  |  |  |  |  |  |  |  |  |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  |  |  |  |  |  |  | $ 238.0 |

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