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Transactions with related parties (Details 4) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Postemployment Benefits [Abstract]      
Defined contribution supplementary pension plans R$ 473,663 R$ 251,250 R$ 311,670
Total R$ 473,663 R$ 251,250 R$ 311,670