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Consolidated Statement of Changes in Equity (Parenthetical) - R$ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of changes in equity [abstract]      
Statutory dividends per share R$ 0.51 R$ 0.16 R$ 0.84
Interest on equity per share     R$ 0.16