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Note 29 - Collateral and Contractual Commitments with Suppliers, Advances From Customers and Other - Future Contractual Commitments (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Future contractual commitments R$ 11,096.3 R$ 4,319.2
Not later than one year [member]    
Statement Line Items [Line Items]    
Future contractual commitments 3,812.8 3,325.7
Later than one year and not later than two years [member]    
Statement Line Items [Line Items]    
Future contractual commitments 2,995.7 420.8
Later than two years [member]    
Statement Line Items [Line Items]    
Future contractual commitments R$ 4,287.8 R$ 572.7