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19. Deferred taxes and contributions (Details 3) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Deferred Taxes And Contributions Details 3Abstract |  |  |
Deferred tax assets (liabilities) net, beginning | R$ (36,754) | R$ 186,345 | R$ 128,242
Net change in the year - corresponding entry to the income statement | (224,596) | (101,517) | (60,667)
Net change in the year - corresponding entry to valuation adjustments to equity (Note 21 (b)) | 108 | (121,582) | 118,770
Total net change | (224,488) | (223,099) | 58,103
Deferred tax assets (liabilities) net, ending | R$ (261,242) | R$ (36,754) | R$ 186,345

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