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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |  |  |  |
Federal statutory income tax rate |  |  |  | 21.00% | 35.00% | 35.00%
State deferred income tax expense |  |  |  | $ (1) | $ 132 | $ 50
Current federal income taxes |  |  |  | 63 | (27) | (70)
Deferred income tax expense |  |  | $ (851) | 46 | (851) | 0
Benefit for deferred income taxes |  |  |  |  |  | 96
Increase (Decrease) to deferred income tax expense |  |  |  | 23 |  |
Increase (Decrease) in regulatory liabilities |  |  |  | 35 | 4,200 |
Decrease in unrecognized tax benefits due to settlement |  |  |  | 6 | 23 | 8
Unrecognized tax benefits that would impact effective tax rate |  |  | 31 | 37 | 31 | 45
Decrease in accumulated deferred income tax liability |  |  | 3,100 |  | 3,100 |
Increase in deferred tax asset |  |  |  |  | 1,100 |
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  |  |  | (5) | $ (9) | (18)
Operating Loss Carryforwards |  |  |  | 1,246 |  |
Continuing Operations [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Increase (Decrease) in regulatory liabilities |  |  |  | 10 |  |
Discontinued Operations [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  | 53 |  |
Discontinued operation, Non Current Liabilities |  |  |  | 23 |  |
Carryback claim for specified liability losses involving prior tax years |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Current federal income taxes |  |  |  | (47) |  |
Maximum |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
State deferred income tax expense |  |  |  | 1 |  |
Decrease in Unrecognized tax benefits due to settlement negotiations and expiration of statutes of limitations |  |  |  | 18 |  |
Amount that earnings could potentially increase if changes were to occur |  |  |  | 17 |  |
Federal |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Federal tax credits |  |  |  |  |  | 129
Realizable domestic production activities deduction |  |  |  |  |  | 17
Operating Loss Carryforwards |  |  |  | $ 120 |  |
Federal | Dominion Midstream Partners, LP | Questar Pipeline, LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Current federal income taxes |  |  |  |  |  | $ 212
Virginia Electric and Power Company |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Federal statutory income tax rate |  |  |  | 21.00% | 35.00% | 35.00%
State deferred income tax expense |  |  |  | $ 55 | $ 59 | $ 27
Current federal income taxes |  |  |  | 76 | 505 | 258
Deferred income tax expense |  |  | (93) | 21 | (93) | 0
Increase (Decrease) to deferred income tax expense |  |  |  | 23 |  |
Increase (Decrease) in regulatory liabilities | $ 14 |  |  | 31 | 2,600 |
Decrease in unrecognized tax benefits due to settlement |  | $ 8 |  | 1 | 8 |
Unrecognized tax benefits that would impact effective tax rate |  | 2 | 3 | 2 | 3 | 9
Interest income |  | $ 11 |  |  |  |
Decrease in accumulated deferred income tax liability |  |  | 1,900 |  | 1,900 |
Increase in deferred tax asset |  |  |  |  | 700 |
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  |  |  | (2) | $ (6) | $ 1
Operating Loss Carryforwards |  |  |  | 1 |  |
Virginia Electric and Power Company | Federal |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  | $ 1 |  |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Federal statutory income tax rate |  |  |  | 21.00% | 35.00% | 35.00%
State deferred income tax expense |  |  |  | $ (17) | $ 5 | $ (18)
Current federal income taxes |  |  |  | (196) | 88 | 208
Deferred income tax expense |  |  | (246) | (6) | (246) | 0
Increase (Decrease) to deferred income tax expense |  |  |  | 5 |  |
Increase (Decrease) in regulatory liabilities |  |  |  | 8 | 1,100 |
Decrease in unrecognized tax benefits due to settlement |  |  |  |  | 7 | 4
Unrecognized tax benefits that would impact effective tax rate |  |  | 2 | 2 | 2 | 9
Decrease in accumulated deferred income tax liability |  |  | 800 |  | 800 |
Increase in deferred tax asset |  |  |  |  | 300 |
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  |  |  | (1) | (5) | (11)
Operating Loss Carryforwards |  |  |  | 63 |  |
Increase in Income Tax Expense |  |  |  | 8 |  |
Discontinued operation, Non Current Liabilities |  |  | 2,917 | 2,896 | 2,917 |
Dominion Energy Gas Holdings, LLC | Disposal Group Discontinued Operation Liabilities Noncurrent [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Increase (Decrease) in regulatory liabilities |  |  |  | 500 |  |
Decrease in accumulated deferred income tax liability |  |  | 400 |  | 400 |
Increase in deferred tax asset |  |  |  | 100 |  |
Dominion Energy Gas Holdings, LLC | Discontinued Operations [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating Loss Carryforwards |  |  | $ 5 | 0 | 5 | 2
Dominion Energy Gas Holdings, LLC | Maximum |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Decrease in Unrecognized tax benefits due to settlement negotiations and expiration of statutes of limitations |  |  |  | 1 |  |
Amount that earnings could potentially increase if changes were to occur |  |  |  | 1 |  |
Dominion Energy Gas Holdings, LLC | Maximum | Discontinued Operations [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Current federal income taxes |  |  |  | 1 | $ 91 | $ 80
Dominion Energy Gas Holdings, LLC | Federal |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  | $ 1 |  |

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