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Note 17 - Deferred Income Tax and Social Contribution - Deferred Income Tax and Social Contribution by Type of Temporary Difference (Details) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Gross deferred tax assets R$ 3,208.6 R$ 3,409.6  
Gross deferred tax liabilities (3,258.5) (3,471.1)  
Net deferred tax assets / (liabilities) (49.9) (61.5) R$ 276.3
Netting by taxable entity, deferred tax assets (929.3) (1,141.4)  
Netting by taxable entity, deferred tax liabilities 929.3 1,141.4  
Net deferred tax assets 2,279.3 2,268.2  
Net deferred tax liabilities (2,329.2) (2,329.7)  
Temporary differences, investment securities [member]      
Statement Line Items [Line Items]      
Gross deferred tax assets 39.0 9.0  
Gross deferred tax liabilities  
Net deferred tax assets / (liabilities) 39.0 9.0  
Temporary differences, intangible assets [member]      
Statement Line Items [Line Items]      
Gross deferred tax assets 0.7  
Gross deferred tax liabilities (719.5) (733.9)  
Net deferred tax assets / (liabilities) (719.5) (733.2)  
Temporary differences, employee benefits [member]      
Statement Line Items [Line Items]      
Gross deferred tax assets 631.1 467.6  
Gross deferred tax liabilities  
Net deferred tax assets / (liabilities) 631.1 467.6  
Temporary differences, trade payables [member]      
Statement Line Items [Line Items]      
Gross deferred tax assets 1,382.4 977.4  
Gross deferred tax liabilities (314.2) (531.3)  
Net deferred tax assets / (liabilities) 1,068.2 446.1  
Temporary differences, trade receivable [member]      
Statement Line Items [Line Items]      
Gross deferred tax assets 52.3 42.7  
Gross deferred tax liabilities  
Net deferred tax assets / (liabilities) 52.3 42.7  
Temporary differences, derivatives [member]      
Statement Line Items [Line Items]      
Gross deferred tax assets 6.8 71.1  
Gross deferred tax liabilities (5.8) (110.7)  
Net deferred tax assets / (liabilities) 1.0 (39.6)  
Temporary differences, inventories [member]      
Statement Line Items [Line Items]      
Gross deferred tax assets 248.7 267.4  
Gross deferred tax liabilities (18.1) (13.8)  
Net deferred tax assets / (liabilities) 230.6 253.6  
Temporary differences, property, plant and equipment [member]      
Statement Line Items [Line Items]      
Gross deferred tax assets  
Gross deferred tax liabilities (920.5) (905.7)  
Net deferred tax assets / (liabilities) (920.5) (905.7)  
Temporary differences, withholding tax over undistributed profits and royalties [member]      
Statement Line Items [Line Items]      
Gross deferred tax assets  
Gross deferred tax liabilities (788.6) (684.8)  
Net deferred tax assets / (liabilities) (788.6) (684.8)  
Temporary differences, investments in associates [member]      
Statement Line Items [Line Items]      
Gross deferred tax assets  
Gross deferred tax liabilities (421.6) (421.6)  
Net deferred tax assets / (liabilities) (421.6) (421.6)  
Unused tax losses [member]      
Statement Line Items [Line Items]      
Gross deferred tax assets 501.0 1,139.9  
Gross deferred tax liabilities  
Net deferred tax assets / (liabilities) 501.0 1,139.9  
Temporary differences, provisions [member]      
Statement Line Items [Line Items]      
Gross deferred tax assets 347.3 448.9  
Gross deferred tax liabilities (39.7) (44.6)  
Net deferred tax assets / (liabilities) 307.6 404.3  
Temporary differences, other items [member]      
Statement Line Items [Line Items]      
Gross deferred tax assets (15.1)  
Gross deferred tax liabilities (30.5) (24.7)  
Net deferred tax assets / (liabilities) R$ (30.5) R$ (39.8)