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Note 32 - Related Parties - Expenses Realted to Management Members (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Short-term benefits (i) [1] R$ 33.4 R$ 21.7 R$ 32.1
Share-based payments (ii) [2] 38.9 36.2 39.0
Total key management remuneration R$ 72.3 R$ 57.9 R$ 71.1
[1] These correspond substantially to management's salaries and profit sharing (including performance bonuses).
[2] These correspond to the compensation cost of stock options and restricted stocks granted to management. These amounts exclude remuneration paid to members of the Fiscal Council.