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Note 12 - Income Tax and Social Contribution - Reconciliation From the Weighted Nominal to the Effective Tax Rate (Details) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement Line Items [Line Items] |  |  |
Income before tax | R$ 12,929.8 | R$ 13,398.4 | R$ 16,513.4
Adjustment on taxable basis |  |  |
Non-taxable income | (310.9) | (392.0) | (999.9)
Government grants related to sales taxes | (1,889.1) | (1,528.6) | (1,360.7)
Share of results of joint ventures | 3.1 | 5.0 | (3.1)
Non-deductible expenses | 91.1 | 539.3 | 415.9
Complement of income tax of foreign subsidiaries due in Brazil | 560.4 | 148.0 | 1,965.2
Results of intercompany transactions non-taxable/not deductible in Brazil | (547.5) | 640.7 | (1,313.2)
| R$ 10,836.9 | R$ 12,810.8 | R$ 15,217.6
Aggregated weighted nominal tax rate | 29.22% | 30.16% | 31.59%
Taxes payable – nominal rate | R$ (3,166.6) | R$ (3,864.0) | R$ (4,806.9)
Adjustment on tax expense |  |  |
Regional incentives - income taxes | 304.6 | 264.5 | 257.8
Deductible interest on shareholders' equity | 1,649.0 | 1,867.7 | 1,646.1
Tax savings from goodwill amortization on tax books | 175.2 | 142.0 | 142.4
Withholding tax over undistributed profits | (356.9) | 153.1 | (672.4)
Recognition / write-off of deferred charges on tax losses | (178.9) | 796.7 | 138.1
PERT 2017 | (2,784.7) |  |
Others with reduced taxation | (721.0) | 325.0 | (339.3)
Income tax and social contribution expense | R$ (5,079.3) | R$ (315.0) | R$ (3,634.2)
Effective tax rate | 39.28% | 2.35% | 22.01%

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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to sharing results of joint ventures. + References No definition available. + Details
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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2017-03-09 + Details
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