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13 Taxes (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Taxes Abstract      
Income before IRPJ and CSLL R$ 2,702,195 R$ 1,955,997 R$ 1,392,941
IRPJ and CSLL (34%) (918,746) (665,039) (473,600)
Tax effects on:      
Equity in income 36,297 46,203 36,555
Interest on own capital 222,848 98,917 90,440
Dividends 192 280 497
Non deductible expenses (16,571) (9,322) (26,292)
Tax incentives 17,804 16,465 14,973
Unrecognized income and social contribution tax loss carry-forwards (48,892) (15,383) (5,645)
Setting up and/or offset of income tax and social contribution losses of prior years   5,037 90,804
Difference between the calculation bases of deemed profit and taxable profit 72,175 11,076 (19,680)
Others (4,433) (227) 17,262
Current IRPJ and CSLL (433,555) (580,065) (379,943)
Deferred IRPJ and CSLL R$ (205,771) R$ 68,072 R$ 105,257
Effective rate - % 23.70% 26.20% 19.70%