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Note 21 - Changes in Equity - Capital Reserves (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Balance, capital reserves R$ 64,230.0  
Balance, capital reserves 63,361.2 R$ 64,230.0
Treasury shares [member]    
Statement Line Items [Line Items]    
Balance, capital reserves (908.7) (1,003.5)
Purchase of shares and result on treasury shares 13.7 94.8
Share-based payments, capital reserve
Balance, capital reserves (895.0) (908.7)
Share premium [member]    
Statement Line Items [Line Items]    
Balance, capital reserves 53,662.8 53,662.8
Purchase of shares and result on treasury shares
Share-based payments, capital reserve
Balance, capital reserves 53,662.8 53,662.8
Other reserves [member]    
Statement Line Items [Line Items]    
Balance, capital reserves 700.9 700.9
Purchase of shares and result on treasury shares
Share-based payments, capital reserve
Balance, capital reserves 700.9 700.9
Reserve of share-based payments [member]    
Statement Line Items [Line Items]    
Balance, capital reserves 1,074.9 1,013.4
Purchase of shares and result on treasury shares
Share-based payments, capital reserve 157.4 61.5
Balance, capital reserves 1,232.3 1,074.9
Capital reserve [member]    
Statement Line Items [Line Items]    
Balance, capital reserves 54,529.9 54,373.6
Purchase of shares and result on treasury shares 13.7 94.8
Share-based payments, capital reserve 157.4 61.5
Balance, capital reserves R$ 54,701.0 R$ 54,529.9