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Income Taxes | 3 Months Ended
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Mar. 31, 2017
Income Tax Disclosure [Abstract] |
Income Taxes | Income Taxes 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 | Virginia Power | Dominion Gas
Three Months Ended March 31, | 2017 | 2016 | 2017 | 2016 | 2017 | 2016
U.S. statutory rate | 35.0 | % | 35.0 | % | 35.0 | % | 35.0 | % | 35.0 | % | 35.0 | %
Increases (reductions) resulting from: |  |  |  |  |  |
State taxes, net of federal benefit | 2.8 |  | 4.3 |  | 3.8 |  | 4.2 |  | 0.3 |  | 3.9 |
Investment tax credits | (4.2 | ) | (10.9 | ) | (0.8 | ) | (1.3 | ) | — |  | — |
Production tax credits | (0.8 | ) | (0.8 | ) | (0.6 | ) | (0.6 | ) | — |  | — |
Other, net | (3.8 | ) | (2.4 | ) | (0.6 | ) | (0.6 | ) | (0.6 | ) | (0.1 | )
Effective tax rate | 29.0 | % | 25.2 | % | 36.8 | % | 36.7 | % | 34.7 | % | 38.8 | %
The effective tax rate in 2017 for Dominion and Dominion Gas reflects the completion of audits by state tax authorities that resulted in the recognition of previously unrecognized tax benefits. Otherwise, as of March 31, 2017, there have been no material changes in the Companies' unrecognized tax benefits or possible changes that could reasonably be expected to occur during the next twelve months. See Note 5 to the Consolidated Financial Statements in the Companies' Annual Report on Form 10-K for the year ended December 31, 2016 for a discussion of these unrecognized tax benefits.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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