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Operating Segments - Dominion Energy (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2019 | May 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Asset early retirement expense |  |  | $ 89.0 |  |  |  |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  | 38.0 | $ 48.0 | $ (187.0) | $ 17.0 |
Virginia Electric and Power Company |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Charge related to a voluntary retirement program |  |  |  |  |  | 192.0 |
Charge related to a voluntary retirement program, after-tax |  |  |  |  |  | 143.0 |
Cancellation abandonment expense |  |  |  |  |  | 62.0 |
Cancellation abandonment expense, after tax |  |  |  |  |  | 46.0 |
Asset early retirement expense after tax |  |  |  |  |  | 275.0 |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  | $ 5.0 | (9.0) | (41.0) | (14.0) |
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 |  |  |  |  |  | 446.0 |
Merger and integration-related costs, after tax |  |  |  |  |  | 339.0 |
Charge related to a voluntary retirement program |  |  |  |  |  | 425.0 |
Charge related to a voluntary retirement program, after-tax |  |  |  |  |  | 317.0 |
Litigation settlement expense | $ 192.5 |  |  |  |  |  |
Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
After- tax net expenses |  |  |  |  | 2,900.0 | 1,800.0 |
Gain loss on investments held in nuclear decommissioning trust funds |  |  |  |  | 145.0 | 336.0 |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  |  |  | 115.0 | 251.0 |
Operating Segments | Virginia Electric and Power Company |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
After- tax net expenses |  |  |  |  | 654.0 | 607.0 |
Asset early retirement expense after tax |  |  |  |  | 559.0 |  |
Corporate and Other | Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
After- tax net expenses |  |  |  |  | 3,100.0 | 2,100.0 |
Corporate and Other | Operating Segments | Virginia Electric and Power Company |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
After- tax net expenses |  |  |  |  | 654.0 | 652.0 |
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 |  |  |  |  |  | 145.0 |
Dominion Energy Virginia | Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  |  |  | 15.0 | 29.0 |
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, Transmission & Storage | Atlantic Coast Pipeline | Supply Header Project |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Cancellation abandonment expense |  |  |  |  | 2,800.0 |  |
Cancellation abandonment expense, after tax |  |  |  |  | 2,200.0 |  |
Gas, Transmission & Storage | SCANA |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Charge related to a voluntary retirement program, after-tax |  |  |  |  |  | 39.0 |
Gas Distribution | SCANA |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Charge related to a voluntary retirement program, after-tax |  |  |  |  |  | 53.0 |
Contracted Generation | SCANA |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Charge related to a voluntary retirement program, after-tax |  |  |  |  |  | 38.0 |
Contracted Generation | Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  |  |  | $ 100.0 | $ 222.0 |

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