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Note 29 - Collateral and Contractual Commitments with Suppliers, Advances From Customers and Other - Components of Collateral and Commiments (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Collateral given for own liabilities R$ 606.3 R$ 1,051.5
Other commitments 842.7 754.3
1,449.0 1,805.8
Commitments with suppliers (i) [1] 11,096.3 4,019.2
Commitments - Bond 2017 300.0
R$ 11,096.3 R$ 4,319.2
[1] Variation refers, mainly, a new contracts with a new suppliers of aluminum in 2017.