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Operating Segments (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  | $ (225.0) | $ (31.0)
SCANA |  |  |
Segment Reporting Information [Line Items] |  |  |
Litigation settlement expense | $ 192.5 |  |
Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
Asset early retirement expense after tax |  |  | 119.0
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  | (46.0) | (5.0)
Benefit from revision of future closure costs |  |  | 113.0
Benefit from revision of future closure costs, after tax |  |  | 84.0
Asset early retirement expense |  |  | 160.0
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
After- tax net expenses |  | 1,000.0 | 1,300.0
Gain loss on investments held in nuclear decommissioning trust funds |  | 538.0 |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  | 410.0 | 197.0
Operating Segments | Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
After- tax net expenses |  | 634.0 | 324.0
Asset early retirement expense after tax |  | 561.0 | 275.0
Gain loss on investments held in nuclear decommissioning trust funds |  | 62.0 |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  | 46.0 |
Asset early retirement expense |  | 754.0 | 369.0
Operating revenue recorded charge |  |  | 29.0
Operating revenue recorded charge, after tax |  |  | 22.0
Corporate and Other | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
After- tax net expenses |  | 1,200.0 | 1,600.0
Corporate and Other | Operating Segments | Virginia Electric and Power Company |  |  |
Segment Reporting Information [Line Items] |  |  |
After- tax net expenses |  | 700.0 | 344.0
Dominion Energy South Carolina Inc |  |  |
Segment Reporting Information [Line Items] |  |  |
Charge for refund of amounts from customers |  |  | 1,000.0
Charge for refund of amounts from customers, after tax |  |  | 756.0
Dominion Energy South Carolina Inc | SCANA |  |  |
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
Litigation settlement expense |  |  | 178.0
Litigation settlement expense, after tax |  |  | 133.0
Merger and integration-related costs |  |  | 106.0
Merger and integration-related costs, after tax |  |  | 81.0
Charge for property, plant and equipment acquired but committed to forgo recovery |  |  | 105.0
Charge for property, plant and equipment acquired but committed to forgo recovery, after tax |  |  | 79.0
Dominion Energy Virginia | Virginia Electric and Power Company | 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 | Virginia Electric and Power Company | 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] |  |  |
Gain loss on investments held in nuclear decommissioning trust funds |  |  | 253.0
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  | 46.0 | 22.0
Dominion Energy Virginia | Operating Segments | Virginia Electric and Power Company | Electric Generation Facilities |  |  |
Segment Reporting Information [Line Items] |  |  |
Asset early retirement expense |  | 754.0 | 369.0
Asset early retirement expense after tax |  | 566.0 | 275.0
Contracted Generation | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  | $ 364.0 | $ 175.0

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