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Note 21 - Changes in Equity - Capital Reserves (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Statement Line Items [Line Items]    
Beginning balance, capital reserves R$ 63,361.2  
Final balance, capital reserves 70,215.3 R$ 63,361.2
Treasury shares [member]    
Statement Line Items [Line Items]    
Beginning balance, capital reserves (895.0) (908.7)
Purchase of shares and result on treasury shares 12.3 13.7
Share-based payments, capital reserve
Capital Increase  
Effect of application of IAS 29 (hyperinflation) (i) [1]  
Final balance, capital reserves (882.7) (895.0)
Share premium [member]    
Statement Line Items [Line Items]    
Beginning balance, capital reserves 53,662.8 53,662.8
Purchase of shares and result on treasury shares
Share-based payments, capital reserve
Capital Increase  
Effect of application of IAS 29 (hyperinflation) (i) [1]  
Final balance, capital reserves 53,662.8 53,662.8
Other reserves [member]    
Statement Line Items [Line Items]    
Beginning balance, capital reserves 700.9 700.9
Purchase of shares and result on treasury shares
Share-based payments, capital reserve
Capital Increase  
Effect of application of IAS 29 (hyperinflation) (i) [1]  
Final balance, capital reserves 700.9 700.9
Reserve of share-based payments [member]    
Statement Line Items [Line Items]    
Beginning balance, capital reserves 1,232.3 1,074.9
Purchase of shares and result on treasury shares
Share-based payments, capital reserve 166.1 157.4
Capital Increase (89.9)  
Effect of application of IAS 29 (hyperinflation) (i) [1] (8.2)  
Final balance, capital reserves 1,300.3 1,232.3
Capital reserve [member]    
Statement Line Items [Line Items]    
Beginning balance, capital reserves 54,701.0 54,529.9
Purchase of shares and result on treasury shares 12.3 13.7
Share-based payments, capital reserve 166.1 157.4
Capital Increase (89.9)  
Effect of application of IAS 29 (hyperinflation) (i) [1] (8.2)  
Final balance, capital reserves R$ 54,781.3 R$ 54,701.0
[1] As described in Note 1 (b) Application of inflation accounting and Financial Reporting in Hyperinflationary Economies.