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Note 17 - Deferred Income Tax and Social Contribution - Deferred Taxes Not Related to Tax Losses (Details) - BRL (R$)
R$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) R$ (49.9) R$ (61.5) R$ 276.3
Temporary differences, investment securities [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) 39.0 9.0  
Temporary differences, investment securities [member] | Not later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities)    
Temporary differences, investment securities [member] | Later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) 39.0    
Temporary differences, intangible assets [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) (719.5) (733.2)  
Temporary differences, intangible assets [member] | Not later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities)    
Temporary differences, intangible assets [member] | Later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) (719.5)    
Temporary differences, employee benefits [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) 631.1 467.6  
Temporary differences, employee benefits [member] | Not later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) 112.8    
Temporary differences, employee benefits [member] | Later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) 518.3    
Temporary differences, trade payables [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) 1,068.2 446.1  
Temporary differences, trade payables [member] | Not later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) 1,382.4    
Temporary differences, trade payables [member] | Later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) (314.2)    
Temporary differences, trade receivable [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) 52.3 42.7  
Temporary differences, trade receivable [member] | Not later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) 47.3    
Temporary differences, trade receivable [member] | Later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) 5.0    
Temporary differences, derivatives [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) 1.0 (39.6)  
Temporary differences, derivatives [member] | Not later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) 1.0    
Temporary differences, derivatives [member] | Later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities)    
Temporary differences, inventories [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) 230.6 253.6  
Temporary differences, inventories [member] | Not later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) 230.6    
Temporary differences, inventories [member] | Later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities)    
Temporary differences, property, plant and equipment [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) (920.5) (905.7)  
Temporary differences, property, plant and equipment [member] | Not later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) (58.1)    
Temporary differences, property, plant and equipment [member] | Later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) (862.4)    
Temporary differences, withholding tax over undistributed profits and royalties [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) (788.6) (684.8)  
Temporary differences, withholding tax over undistributed profits and royalties [member] | Not later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities)    
Temporary differences, withholding tax over undistributed profits and royalties [member] | Later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) (788.6)    
Temporary differences, investments in associates [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) (421.6) (421.6)  
Temporary differences, investments in associates [member] | Not later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities)    
Temporary differences, investments in associates [member] | Later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) (421.6)    
Temporary differences, provisions [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) 307.6 404.3  
Temporary differences, provisions [member] | Not later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) 91.7    
Temporary differences, provisions [member] | Later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) 215.9    
Temporary differences, other items [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) (30.5) R$ (39.8)  
Temporary differences, other items [member] | Not later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities)    
Temporary differences, other items [member] | Later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) (30.5)    
Deferred taxes not related to tax losses [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) (550.9)    
Deferred taxes not related to tax losses [member] | Not later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) 1,807.7    
Deferred taxes not related to tax losses [member] | Later than one year [member]      
Statement Line Items [Line Items]      
Net deferred tax assets / (liabilities) R$ (2,358.6)