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Income Taxes (Narrative) (Detail) - USD ($) $ in Millions | 1 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Oct. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |  |  |
Federal statutory income tax rate |  |  |  | 21.00% | 21.00% | 35.00%
State deferred income tax expense |  |  |  | $ (93.0) | $ (1.0) | $ 132.0
Current federal income taxes |  |  |  | 135.0 | 63.0 | (27.0)
Taxes charged to common shareholders' equity |  |  |  | 215.0 |  |
Deferred income tax expense | [1] |  |  |  | 46.0 | (851.0)
Increase (Decrease) to deferred income tax expense |  |  |  |  | 23.0 |
Increase (Decrease) in regulatory liabilities |  |  |  |  | 35.0 | 4,200.0
Decrease in unrecognized tax benefits due to settlement |  |  |  | 7.0 | 6.0 | 23.0
Unrecognized tax benefits that would impact effective tax rate |  |  |  | 141.0 | 37.0 | 31.0
Decrease in accumulated deferred income tax liability |  |  |  |  |  | 3,100.0
Increase (decrease) in deferred tax asset |  |  |  |  |  | 1,100.0
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  |  |  | 3.0 | 5.0 | (9.0)
Operating Loss Carryforwards |  |  |  | 4,435.0 |  |
Income tax expense (benefit) |  |  |  | 351.0 | 580.0 | (30.0)
Deferred tax liabilities noncurrent |  |  |  | 6,277.0 | 5,116.0 |
Regulatory liability noncurrent |  |  |  | 11,001.0 | 6,840.0 |
Dominion Cove Point L N G L P [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Current federal income taxes |  |  |  | 362.0 |  |
Benefit for deferred income taxes |  |  |  | 147.0 |  |
Federal tax credits |  |  |  | $ 208.0 |  |
Ownership interest percentage of limited partner interests |  |  |  | 25.00% |  |
SCANA |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Deferred income tax expense |  |  |  | $ 194.0 |  |
Noncurrent Liabilities [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Increase (Decrease) in regulatory liabilities |  |  |  |  | $ 23.0 |
Discontinued Operations [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Income tax expense (benefit) |  |  | $ 33.0 |  |  | 5.0
Deferred tax liabilities noncurrent |  |  |  |  |  | $ 0.4
Carryback claim for specified liability losses involving prior tax years |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Current federal income taxes |  |  |  | 47.0 |  |
Maximum |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
State deferred income tax expense |  |  |  | 1.0 |  |
Decrease in Unrecognized tax benefits due to settlement negotiations and expiration of statutes of limitations |  |  |  | 86.0 |  |
Amount that earnings could potentially increase if changes were to occur |  |  |  | 23.0 |  |
Federal |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  | $ 1,361.0 |  |
Virginia Electric and Power Company |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Federal statutory income tax rate |  |  |  | 21.00% | 21.00% | 35.00%
State deferred income tax expense |  |  |  | $ 22.0 | $ 55.0 | $ 59.0
Current federal income taxes |  |  |  | 344.0 | 76.0 | 505.0
Deferred income tax expense | [1] |  |  | 0.0 | 21.0 | (93.0)
Increase (Decrease) to deferred income tax expense |  |  |  |  | 23.0 |
Increase (Decrease) in regulatory liabilities |  |  |  |  | 31.0 | 2,600.0
Decrease in unrecognized tax benefits due to settlement |  | $ 8.0 |  | 2.0 | 1.0 | 8.0
Unrecognized tax benefits that would impact effective tax rate |  | 2.0 |  | 1.0 | 2.0 | 3.0
Interest income |  | $ 11.0 |  |  |  |
Decrease in accumulated deferred income tax liability |  |  |  |  |  | 1,900.0
Increase (decrease) in deferred tax asset |  |  |  |  |  | 700.0
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  |  |  | (2.0) |  | (6.0)
Income tax expense (benefit) |  |  |  | 264.0 | 300.0 | $ 774.0
Deferred tax liabilities noncurrent |  |  |  | 2,962.0 | 3,017.0 |
Regulatory liability noncurrent |  |  |  | $ 5,074.0 | $ 4,647.0 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Federal statutory income tax rate |  |  |  | 21.00% | 21.00% | 35.00%
State deferred income tax expense |  |  |  | $ (10.0) | $ (17.0) | $ 5.0
Current federal income taxes |  |  |  | 147.0 | (196.0) | 88.0
Deferred income tax expense | [1] |  |  |  | (6.0) | (246.0)
Increase (Decrease) to deferred income tax expense |  |  |  |  | (5.0) |
Increase (Decrease) in regulatory liabilities |  |  |  |  | (8.0) | 1,100.0
Decrease in unrecognized tax benefits due to settlement |  |  |  | 0.0 | 0.0 | 7.0
Decrease in accumulated deferred income tax liability |  |  |  |  |  | 800.0
Increase (decrease) in deferred tax asset |  |  |  |  |  | 300.0
Increase (Decrease) in tax expense as a result of changes in unrecognized tax benefits |  |  |  |  | (1.0) | (5.0)
Operating Loss Carryforwards |  |  |  | 1.0 |  |
Income tax expense (benefit) |  |  |  | 101.0 | 124.0 | (65.0)
Deferred tax liabilities noncurrent |  |  |  | 1,288.0 | 1,330.0 |
Regulatory liability noncurrent |  |  |  | 800.0 | 765.0 |
Dominion Energy Gas Holdings, LLC | Discontinued Operations [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Increase (Decrease) to deferred income tax expense |  |  |  |  | 8.0 |
Increase (Decrease) in regulatory liabilities |  |  |  |  | 10.0 |
Income tax expense (benefit) |  |  |  |  | 91.0 |
Deferred tax liabilities noncurrent |  |  |  |  |  | 0.1
Regulatory liability noncurrent |  |  |  |  |  | 0.5
Dominion Energy Gas Holdings, LLC | Maximum |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Unrecognized tax benefits that would impact effective tax rate |  |  |  | 2.0 | 2.0 | $ 2.0
Decrease in Unrecognized tax benefits due to settlement negotiations and expiration of statutes of limitations |  |  |  | 1.0 |  |
Amount that earnings could potentially increase if changes were to occur |  |  |  | 1.0 |  |
Dominion Energy Gas Holdings, LLC | Maximum | Discontinued Operations [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  | $ 1.0 |
Dominion Energy Gas Holdings, LLC | Federal |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Deferred income tax expense |  |  |  | $ 48.0 |  |
[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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