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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |  |  |  |
Federal statutory income tax rate |  |  |  | 35.00% | 35.00% | 35.00%
Percentage of bonus depreciation allowance for qualifying expenditures incurred |  | 50.00% |  | 50.00% | 50.00% | 50.00%
Percentage of investment tax credit for qualifying expenditures to be incurred in 2019 |  | 30.00% |  | 30.00% |  |
Percentage of investment tax credit for qualifying expenditures to be incurred in 2020 |  | 26.00% |  | 26.00% |  |
Percentage of investment tax credit for qualifying expenditures to be incurred in 2021 |  | 22.00% |  | 22.00% |  |
Percentage of investment tax credit for qualifying expenditures to be incurred in 2022 |  | 10.00% |  | 10.00% |  |
Percentage of investment tax credit for qualifying expenditures to be incurred thereafter |  | 10.00% |  | 10.00% |  |
Deferred income tax expense |  | $ (851) |  | $ (851) |  |
Provision for current income taxes |  |  |  | (27) | $ (70) | $ 51
Benefit for deferred income taxes |  |  |  |  | 96 |
Decrease in unrecognized tax benefits due to settlement |  |  |  | 23 | 8 | 5
Unrecognized tax benefits that would impact effective tax rate |  | 31 |  | 31 | 45 | 69
Decrease in accumulated deferred income tax liability |  | 3,100 |  | 3,100 |  |
Increase in regulatory liabilities |  |  |  | 4,200 |  |
Increase in deferred tax asset |  |  |  | 1,100 |  |
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  |  |  | $ (9) | $ (18) | $ (6)
Virginia Electric and Power Company |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Federal statutory income tax rate |  |  |  | 35.00% | 35.00% | 35.00%
Deferred income tax expense |  | (93) |  | $ (93) |  |
Provision for current income taxes |  |  |  | 505 | $ 258 | $ 408
Decrease in unrecognized tax benefits due to settlement | $ 8 |  |  | 8 |  |
Unrecognized tax benefits that would impact effective tax rate | 2 | 3 |  | 3 | 9 | $ 8
Interest income | $ 11 |  |  |  |  |
Decrease in accumulated deferred income tax liability |  | 1,900 |  | 1,900 |  |
Increase in regulatory liabilities |  |  |  | 2,600 |  |
Increase in deferred tax asset |  |  |  | 700 |  |
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  |  |  | $ (6) | $ 1 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Federal statutory income tax rate |  |  |  | 35.00% | 35.00% | 35.00%
Deferred income tax expense |  | (197) |  | $ (197) |  |
Provision for current income taxes |  |  |  | 24 | $ (23) | $ 120
Decrease in unrecognized tax benefits due to settlement |  |  |  | 7 | 4 |
Unrecognized tax benefits that would impact effective tax rate |  |  |  |  | 5 | 19
Decrease in accumulated deferred income tax liability |  | 800 |  | 800 |  |
Increase in regulatory liabilities |  |  |  | 1,000 |  |
Increase in deferred tax asset |  |  |  | 200 |  |
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  |  |  | (5) | (11) |
Maximum |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Decrease in Unrecognized tax benefits due to settlement negotiations and expiration of statutes of limitations |  | 13 |  | 13 |  |
Amount that earnings could potentially increase if changes were to occur |  |  |  | 12 |  |
Maximum | Virginia Electric and Power Company |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  |  |  |  |  | 1
Decrease in Unrecognized tax benefits due to settlement negotiations and expiration of statutes of limitations |  | 2 |  | 2 |  |
Amount that earnings could potentially increase if changes were to occur |  |  |  | 2 |  |
Maximum | Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Unrecognized tax benefits that would impact effective tax rate |  | 1 |  | 1 |  |
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  |  |  |  |  | 1
Decrease in Unrecognized tax benefits due to settlement negotiations and expiration of statutes of limitations |  | $ 1 |  | 1 |  |
Amount that earnings could potentially increase if changes were to occur |  |  |  | $ 1 |  |
Scenario, Forecast |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Federal statutory income tax rate |  |  | 21.00% |  |  |
Federal |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Federal tax credits |  |  |  |  | 129 |
Realizable domestic production activities deduction |  |  |  |  | 17 |
Federal | Dominion Midstream Partners, LP | Questar Pipeline, LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Provision for current income taxes |  |  |  |  | $ 212 |
Federal | IRS |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Benefit related to carryback recognized |  |  |  |  |  | $ 20
Tax year under ongoing examination |  |  |  | 2017 |  |

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