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Note 26 - Provisions - Changes in Provisions (Details)
R$ in Millions
 12 Months Ended
Dec. 31, 2017
BRL (R$)
Statement Line Items [Line Items]  
Balance R$ 934.0
Effect of changes in foreign (3.5)
Additions 558.5
Provisions used and reversed (807.4)
Balance 681.6
Restructuring provision [member]  
Statement Line Items [Line Items]  
Balance 7.4
Effect of changes in foreign 0.7
Additions
Provisions used and reversed
Balance 8.1
Provision for taxes other than income tax [member]  
Statement Line Items [Line Items]  
Balance 247.2
Effect of changes in foreign 0.2
Additions 113.9
Provisions used and reversed (135.0)
Balance 226.3
Provision for income tax [member]  
Statement Line Items [Line Items]  
Balance 323.4
Effect of changes in foreign 3.0
Additions 167.4
Provisions used and reversed (336.8)
Balance 157.0
Provisions for labor [member]  
Statement Line Items [Line Items]  
Balance 165.8
Effect of changes in foreign (1.4)
Additions 142.0
Provisions used and reversed (176.9)
Balance 129.5
Legal proceedings provision [member]  
Statement Line Items [Line Items]  
Balance 43.9
Effect of changes in foreign (0.1)
Additions 65.4
Provisions used and reversed (74.0)
Balance 35.2
Miscellaneous other provisions [member]  
Statement Line Items [Line Items]  
Balance 146.3
Effect of changes in foreign (5.9)
Additions 69.8
Provisions used and reversed (84.7)
Balance 125.5
Total contingent provisions [member]  
Statement Line Items [Line Items]  
Balance 926.6
Effect of changes in foreign (4.2)
Additions 558.5
Provisions used and reversed (807.4)
Balance R$ 673.5