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v3.19.3.a.u2

Operating Segments (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
After-tax charge related to the impairment of gathering and processing assets |  |  |  | $ 164 |  |  |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  |  |  | $ (93) | $ (17) | $ 141
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act | [1] |  |  |  |  | 46 | (851)
Charges associated with equity method investments in wind-powered generation facilities |  |  |  |  |  |  | 158
Charge related to a voluntary retirement program |  |  |  |  | 320 |  |
Virginia Electric and Power Company |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  |  |  | (17) | 2 | 16
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act | [1] |  |  |  | 0 | 21 | (93)
Charge related to a voluntary retirement program |  |  |  |  | 116 |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  |  |  | (18) | (45) | 26
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act | [1] |  |  |  |  | (6) | (246)
Transaction and transition costs related to acquisition |  |  |  |  | 603 | 230 | 239
Charge related to a voluntary retirement program |  |  |  |  | 20 |  |
Virginia Legislation | Virginia Electric and Power Company |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Benefit from revision of future closure costs |  |  |  |  | 113 |  |
Benefit from revision of future closure costs, after tax |  |  |  |  | 84 |  |
Corporate and Other |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
After- tax net benefit (expenses) |  |  |  |  | (627) |  |
Dominion Energy Virginia | Virginia Electric and Power Company |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Asset early retirement expense |  |  |  |  | 160 |  |
Asset early retirement expense after tax |  |  |  |  | 119 |  |
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 |  |
Dominion Energy Virginia | Virginia Legislation | Virginia Electric and Power Company |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Benefit from revision of future closure costs |  |  |  |  | 113 |  |
Benefit from revision of future closure costs, after tax |  |  |  |  | 84 |  |
Dominion Energy South Carolina Inc |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Charge for refund of amounts from customers, after tax |  |  |  |  | 756 |  |
Charge for refund of amounts from customers |  |  |  |  | 1,000 |  |
Remeasured Subsequent To Initial Recognition |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  |  |  | 1,000 |  |
SCANA |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Gain loss on investments held in nuclear decommissioning trust funds |  |  |  |  | 150 |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  |  |  | 194 |  |
Transaction and transition costs related to acquisition |  |  | $ 1,300 |  | 484 |  |
Transaction and transition costs related to acquisition, after tax |  |  |  |  | 315 |  |
Income tax related to regulatory assets acquired |  |  |  |  | 258 |  |
Charge related to a voluntary retirement program |  |  |  |  | 444 |  |
Charge related to a voluntary retirement program, after-tax |  |  |  |  | 332 |  |
Charge related to a voluntary retirement program after tax |  | $ 316 |  |  |  |  |
SCANA | Dominion Energy Virginia |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Charge related to a voluntary retirement program, after-tax |  |  |  |  | 151 |  |
SCANA | Gas, Transmission & Storage |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Charge related to a voluntary retirement program, after-tax |  |  |  |  | 5 |  |
SCANA | Contracted Generation |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Charge related to a voluntary retirement program, after-tax |  |  |  |  | 38 |  |
SCANA | Dominion Energy South Carolina Inc |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  |  |  | 194 |  |
Transaction and transition costs related to acquisition |  |  |  |  | 641 |  |
Transaction and transition costs related to acquisition, after tax |  |  |  |  | 480 |  |
Income tax related to regulatory assets acquired |  |  | $ 258 |  |  |  |
Charge related to a voluntary retirement program, after-tax |  |  |  |  | 75 |  |
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 |  |
SCANA | Gas Distribution |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Charge related to a voluntary retirement program, after-tax |  |  |  |  | 56 |  |
Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Gain loss on investments held in nuclear decommissioning trust funds |  |  |  |  | 553 | 170 |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  |  |  | 411 | 134 |
After- tax net benefit (expenses) |  |  |  |  | (2,000) | (88) | 861
Benefit associated with sale of certain merchant generation facilities and equity method investments |  |  |  |  |  | 828 |
Benefit associated with sale of certain merchant generation facilities and equity method investments, after tax |  |  |  |  |  | 619 |
Operating Segments | Virginia Electric and Power Company |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  |  |  |  |  | 93
Charge related to a voluntary retirement program |  |  |  |  | 198 |  |
Charge related to a voluntary retirement program, after-tax |  |  |  |  | 146 |  |
Operating Segments | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
After- tax net benefit (expenses) |  |  |  |  |  | (107) | (156)
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  |  |  |  |  | 169
Charge for disallowance of FERC-regulated plant |  |  |  |  |  | 124 |
After-tax charge for disallowance of FERC-regulated plant |  |  |  |  |  | 88 |
Charge for disallowance of FERC-regulated plant |  |  |  |  |  | 124 |
Operating Segments | Virginia Regulation |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Charge associated with asset retirement obligations for ash ponds and landfills at certain utility generation facilities |  |  |  |  |  | 81 |
Charge associated with asset retirement obligations for ash ponds and landfills at certain utility generation facilities, after tax |  |  |  |  |  | 60 |
Operating Segments | Corporate and Other |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
After- tax net benefit (expenses) |  |  |  |  | (2,600) | (611) | 377
Operating Segments | Corporate and Other | Virginia Electric and Power Company |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
After- tax net benefit (expenses) |  |  |  |  | (634) | (312) | 74
Operating Segments | Corporate and Other | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
After- tax net benefit (expenses) |  |  |  |  | 127 | (90) | $ 389
Tax benefit resulting from changes in tax status ofsubsidiaries |  |  |  |  | 48 |  |
Charge related to a voluntary retirement program |  |  |  |  | 42 |  |
Charge related to a voluntary retirement program after tax |  |  |  |  | 31 |  |
Operating Segments | Gas Infrastructure |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Benefit associated with sale of certain merchant generation facilities and equity method investments, after tax |  |  |  |  |  | 390 |
Operating Segments | Dominion Energy Virginia |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  |  |  | 49 | 14 |
Operating Segments | Dominion Energy Virginia | Virginia Electric and Power Company |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Asset early retirement expense |  |  |  |  | 346 |  |
Asset early retirement expense after tax |  |  |  |  | 257 |  |
Operating Segments | Dominion Energy Virginia | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
After- tax net benefit (expenses) |  |  |  |  | 12 |  |
Asset early retirement expense |  |  |  |  | 346 |  |
Asset early retirement expense after tax |  |  |  |  | 257 |  |
Operating Segments | Dominion Energy Virginia | Virginia Legislation |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
One-time rate credit amount |  |  |  |  |  | 215 |
One-time rate credit amount after tax |  |  |  |  |  | 160 |
Operating Segments | Power Delivery |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Charge associated with major storm damage and service restoration |  |  |  |  |  | 70 |
Charge associated with major storm damage and service restoration, after tax |  |  |  |  |  | 52 |
Benefit associated with sale of certain merchant generation facilities and equity method investments, after tax |  |  |  |  |  | 229 |
Operating Segments | Gas, Transmission & Storage |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
After-tax charge related to the impairment of gathering and processing assets |  |  |  |  |  | 164 |
Charge related to impairment of certain gathering and processing assets |  |  |  |  |  | 219 |
Operating Segments | Contracted Generation |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Gain loss on investments held in nuclear decommissioning trust funds, after tax |  |  |  |  | 362 | $ 120 |
Charges associated with equity method investments in wind-powered generation facilities |  |  |  |  | 158 |  |
Charges associated with equity method investments in wind-powered generation facilities, after tax |  |  |  |  | 96 |  |
Operating Segments | Remeasured Subsequent To Initial Recognition | Dominion Energy Virginia |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  |  |  | 83 |  |
Operating Segments | Remeasured Subsequent To Initial Recognition | Gas, Transmission & Storage |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  |  |  | 302 |  |
Operating Segments | Remeasured Subsequent To Initial Recognition | Contracted Generation |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  |  |  | 569 |  |
Operating Segments | Remeasured Subsequent To Initial Recognition | Gas Distribution |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Tax benefit resulting from remeasurement of deferred income taxes as a result of the 2017 Tax Reform Act |  |  |  |  | $ 56 |  |
[1] | The 2017 Tax Reform Act impact for Dominion Energy Gas includes an expense of $8 million for the year ended December 31, 2018 and a benefit of $93 million for the year ended December 31, 2017 arising from discontinued operations.

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