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Operating Segments (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Gain loss on investments held in nuclear decommissioning trust funds, after tax | $ (94) | $ 18 |  | $ (77) | $ 163
Revision to future ash pond and landfill closure costs |  |  |  | (113) |
SCANA |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Merger and integration related costs |  |  |  | 570 |
Merger and integration-related costs, after tax |  |  |  | 429 |
Charge related to a voluntary retirement program |  |  |  | 444 |
Charge related to a voluntary retirement program, after-tax |  |  |  | 332 |
Income tax related to regulatory assets acquired | 264 |  |  | 264 |
Income tax related to regulatory assets acquired, after tax | 198 |  |  | 198 |
Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain loss on investments held in nuclear decommissioning trust funds, after tax | (15) | 3 |  | (29) | 8
Revision to future ash pond and landfill closure costs |  |  |  | (113) |
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain loss on investments held in nuclear decommissioning trust funds, after tax | (27) | $ 10 |  | (44) | 16
Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
After- tax net expenses |  |  |  | 2,000 | 188
Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
After- tax net expenses |  |  |  | 653 | 226
Charge related to a voluntary retirement program |  |  |  | 197 |
Charge related to a voluntary retirement program, after-tax |  |  |  | 146 |
Operating Segments | Virginia Electric and Power Company | Virginia Legislation |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
One-time rate credit amount |  |  | $ 215 |  | 215
One-time rate credit amount after tax |  |  | 160 |  | 160
Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
After- tax net expenses |  |  |  |  | 99
Corporate and Other | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
After- tax net expenses |  |  |  | 2,100 | 253
Corporate and Other | Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
After- tax net expenses |  |  |  | 673 | 229
Corporate and Other | Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
After- tax net expenses |  |  |  | 53 | 100
Southeast Energy |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Charge for refund of amounts from customers | $ 1,000 |  |  | 1,000 |
Charge for refund of amounts from customers, after tax |  |  |  | 760 |
Charge for property, plant and equipment acquired but committed to forgo recovery |  |  |  | 114 |
Charge for property, plant and equipment acquired but committed to forgo recovery, after tax |  |  |  | 86 |
Southeast Energy | SCANA |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Merger and integration-related costs, after tax |  |  |  | 160 |
Litigation settlement expense |  |  |  | 316 |
Litigation settlement expense, after tax |  |  |  | 237 |
Power Generation | SCANA |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Merger and integration-related costs, after tax |  |  |  | 110 |
Power Generation | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Asset early retirement expense |  |  |  | 369 |
Asset early retirement expense, after tax |  |  |  | 275 |
Contract termination with a non-utility generator |  |  |  | 135 |
Contract termination with a non-utility generator, after tax |  |  |  | 100 |
Power Generation | Virginia Electric and Power Company | Virginia Legislation |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Benefit from revision of future closure costs |  |  |  | 113 |
Benefit from revision of future closure costs, after tax |  |  |  | 84 |
Power Generation | Operating Segments |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain loss on investments held in nuclear decommissioning trust funds |  |  |  | 364 | 156
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  |  | 272 | 121
Power Generation | Operating Segments | Virginia Regulation |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revision to future ash pond and landfill closure costs |  |  |  |  | 81
Environmental Remediation Expense, net of tax |  |  |  |  | 60
Power Generation | Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Charge related to a voluntary retirement program, after-tax |  |  |  | 72 |
Asset early retirement expense |  |  |  | 369 |
Asset early retirement expense, after tax |  |  |  | 275 |
Contract termination with a non-utility generator |  |  |  | 135 |
Contract termination with a non-utility generator, after tax |  |  |  | 100 |
Abandonment expense |  |  |  | 62 |
Abandonment expense, after tax |  |  |  | 46 |
Power Generation | Operating Segments | Virginia Electric and Power Company | Virginia Legislation |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Benefit from revision of future closure costs |  |  |  | 113 |
Benefit from revision of future closure costs, after tax |  |  |  | 84 |
Charge associated with one-time rate credits of certain amounts to utility customers, after tax |  |  | 109 |  | 109
Revision to future ash pond and landfill closure costs |  |  |  |  | 81
Environmental Remediation Expense, net of tax |  |  |  |  | 60
Power Delivery | SCANA |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Merger and integration-related costs, after tax |  |  |  | 77 |
Power Delivery | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Asset early retirement expense |  |  |  | 160 |
Asset early retirement expense, after tax |  |  |  | 119 |
Power Delivery | Operating Segments | Virginia Electric and Power Company |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Charge related to a voluntary retirement program, after-tax |  |  |  | 74 |
Asset early retirement expense |  |  |  | 160 |
Asset early retirement expense, after tax |  |  |  | 119 |
Power Delivery | Operating Segments | Virginia Electric and Power Company | Virginia Legislation |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Charge associated with one-time rate credits of certain amounts to utility customers, after tax |  |  | $ 51 |  | 51
Gas Infrastructure | SCANA |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Merger and integration-related costs, after tax |  |  |  | 82 |
Gas Infrastructure | Operating Segments | FERC-Regulated Plant |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Charge for disallowance of FERC-regulated plant |  |  |  |  | 124
Charge for disallowance of FERC-regulated plant, after tax |  |  |  |  | 88
Gas Infrastructure | Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Charge related to a voluntary retirement program |  |  |  | 63 |
Charge related to a voluntary retirement program, after-tax |  |  |  | $ 48 |
Gas Infrastructure | Operating Segments | Dominion Energy Gas Holdings, LLC | FERC-Regulated Plant |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Charge for disallowance of FERC-regulated plant |  |  |  |  | 124
Charge for disallowance of FERC-regulated plant, after tax |  |  |  |  | $ 88

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