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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)
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
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
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 |  |  |  | $ (4) | $ 20 | $ 1
Current federal income taxes |  |  |  | 53 | 24 | (23)
Deferred income tax expense |  |  | (197) | (11) | (197) | 0
Increase (Decrease) to deferred income tax expense |  |  |  | 11 |  |
Increase (Decrease) in regulatory liabilities |  |  |  | (16) | 1,000 |
Decrease in unrecognized tax benefits due to settlement |  |  |  |  | 7 | 4
Unrecognized tax benefits that would impact effective tax rate |  |  |  |  |  | 5
Decrease in accumulated deferred income tax liability |  |  | 800 |  | 800 |
Increase in deferred tax asset |  |  |  |  | 200 |
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  |  |  | (1) | (5) | $ (11)
Dominion Energy Gas Holdings, LLC | Maximum |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Unrecognized tax benefits that would impact effective tax rate |  |  | $ 1 | 1 | $ 1 |
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 |  |

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