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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2020
Income Tax Disclosure [Abstract] |
Effective Income Tax | For continuing operations, including noncontrolling interests, the statutory U.S. federal income tax rate reconciles to the Companies’ effective income tax rate as follows:
|  | Dominion Energy |  |  | Virginia Power |  |  | Dominion Energy Gas |  |
Six Months Ended June 30, |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |  |
U.S. statutory rate |  |  | 21.0 | % |  |  | 21.0 | % |  |  | 21.0 | % |  |  | 21.0 | % |  |  | 21.0 | % |  |  | 21.0 | % |
Increases (reductions) resulting from: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State taxes, net of federal benefit |  |  | 5.6 |  |  |  | 0.7 |  |  |  | 4.9 |  |  |  | 4.7 |  |  |  | (255.3 | ) |  |  | 3.0 |  |
Investment tax credits |  |  | 3.9 |  |  |  | (3.8 | ) |  |  | (11.3 | ) |  |  | (5.2 | ) |  |  | — |  |  |  | — |  |
Production tax credits |  |  | 0.3 |  |  |  | (1.1 | ) |  |  | (2.0 | ) |  |  | (0.8 | ) |  |  | — |  |  |  | — |  |
Reversal of excess deferred income taxes |  |  | 1.5 |  |  |  | (6.9 | ) |  |  | (0.8 | ) |  |  | (4.2 | ) |  |  | (68.4 | ) |  |  | (0.9 | ) |
Write-off of regulatory assets |  |  | (4.2 | ) |  |  | (41.6 | ) |  |  | — |  |  |  | — |  |  |  | 189.4 |  |  |  | — |  |
AFUDC - equity |  |  | 0.5 |  |  |  | (1.9 | ) |  |  | (0.6 | ) |  |  | (0.1 | ) |  |  | (36.8 | ) |  |  | (0.5 | ) |
Other, net |  |  | 0.9 |  |  |  | (0.3 | ) |  |  | 1.1 |  |  |  | 0.4 |  |  |  | (467.1 | ) | (1) |  | (4.3 | ) | (1)
Effective tax rate |  |  | 29.5 | % |  |  | (33.9 | )% |  |  | 12.3 | % |  |  | 15.8 | % |  |  | (617.2 | )% |  |  | 18.3 | % |
(1) | Includes (276.0)% and (4.0)% relating to the absence of tax on noncontrolling interest in 2020 and 2019, respectively.

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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