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v3.19.3

Operating Segments (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |
Gain loss on investments held in nuclear decommissioning trust funds, after tax | $ 48 |  | $ 13 |  | $ 17 | $ 145
Revision to future ash pond and landfill closure costs |  |  |  |  | (113) |
SCANA |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Merger and integration related costs |  |  |  |  | 548 |
Merger and integration-related costs, after tax |  |  |  |  | 418 |
Charge related to a voluntary retirement program |  |  |  |  | 425 |
Charge related to a voluntary retirement program, after-tax |  |  |  |  | 317 |
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 | (9) |  |  |  | (14) | 5
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 | 5 |  | $ (6) |  | (18) | 7
Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
After- tax net expenses |  |  |  |  | 1,900 | 310
Operating Segments | Virginia Electric and Power Company |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
After- tax net expenses |  |  |  |  | 607 | 230
Charge related to a voluntary retirement program |  |  |  |  | 192 |
Charge related to a voluntary retirement program, after-tax |  |  |  |  | 143 |
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 |  |  |  |  | 43 | 89
Corporate and Other | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
After- tax net expenses |  |  |  |  | 2,100 | 349
Corporate and Other | Operating Segments | Virginia Electric and Power Company |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
After- tax net expenses |  |  |  |  | 652 | 237
Corporate and Other | Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
After- tax net expenses |  |  |  |  | 44 | 91
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 |  |  |  |  | 156 |
Litigation settlement expense |  |  |  |  | 278 |
Litigation settlement expense, after tax |  |  |  |  | 209 |
Power Generation | SCANA |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Merger and integration-related costs, after tax |  |  |  |  | 109 |
Power Generation | Virginia Electric and Power Company |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Asset retirement obligations |  |  |  |  | 369 |
Asset retirement obligations, 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 |  |  |  |  | 336 |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  |  |  | 251 |
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 retirement obligations |  |  |  |  | 369 |
Asset retirement obligations, 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 |  |  |  |  | 73 |
Power Delivery | Virginia Electric and Power Company |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Asset retirement obligations |  |  |  |  | 160 |
Asset retirement obligations, 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 |  |  |  |  | 71 |
Asset retirement obligations |  |  |  |  | 160 |
Asset retirement obligations, 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 |  |  |  |  | 80 |
Gas Infrastructure | Operating Segments | FERC-Regulated Plant |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Charge for disallowance of FERC-regulated plant |  |  |  |  |  | 122
Charge for disallowance of FERC-regulated plant, after tax |  |  |  |  |  | 89
Gas Infrastructure | Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Charge related to a voluntary retirement program |  |  |  |  | 42 |
Charge related to a voluntary retirement program, after-tax |  |  |  |  | $ 31 |
Gas Infrastructure | Operating Segments | Dominion Energy Gas Holdings, LLC | FERC-Regulated Plant |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Charge for disallowance of FERC-regulated plant |  |  |  |  |  | 122
Charge for disallowance of FERC-regulated plant, after tax |  |  |  |  |  | $ 89

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