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Note 12 - Income Tax and Social Contribution (Tables)
 12 Months Ended
Dec. 31, 2018
Statement Line Items [Line Items]  
Disclosure of income tax [text block]
      2018       2017       2016  
Income tax expense - current    
(1,833.5
 )    
(5,332.3
 )    
(413.9
 )
                         
Deferred tax expense on temporary differences    
(246.1
 )    
891.9
      
(732.5
 )
Deferred tax over taxes losses carryforwards movements  in the current period    
290.0
      
(638.9
 )    
831.4
  
Total deferred tax (expense)/income    
43.9
      
253.0
      
98.9
  
                         
Total income tax expenses    
(1,789.6
 )    
(5,079.3
 )    
(315.0
 )
Disclosure of reconciliation from the weighted nominal to the effective tax rate [text block]
      2018       2017       2016  
Profit before tax    
13,167.0
      
12,929.8
      
13,398.4
  
Adjustment on taxable basis                        
Others non-taxable income    
(400.8
 )    
(310.9
 )    
(392.0
 )
Government grants related to sales taxes    
(1,807.3
 )    
(1,889.1
 )    
(1,528.6
 )
Share of result of joint ventures    
(1.0
 )    
3.1
      
5.0
  
Non-deductible expenses    
305.5
      
91.1
      
539.3
  
Complement of income tax of foreign subsidiaries due in Brazil    
503.0
      
560.4
      
148.0
  
Results of intercompany transactions    
(693.4
 )    
(547.5
 )    
640.7
  
     
11,073.0
      
10,836.9
      
12,810.8
  
Aggregated weighted nominal tax rate    
29.98
 %    
29.22
 %    
30.16
 %
Taxes payable – nominal rate    
(3,319.5
 )    
(3,166.6
 )    
(3,864.0
 )
Adjustment on tax expense                        
Income tax Incentives    
219.7
      
304.6
      
264.5
  
Deductible interest on shareholders' equity    
1,710.4
      
1,649.0
      
1,867.7
  
Tax savings from goodwill amortization    
72.3
      
175.2
      
142.0
  
Withholding income tax    
(220.0
 )    
(356.9
 )    
153.1
  
Recognition / write-off of deferred charges on tax losses    
(41.6
 )    
(178.9
 )    
796.7
  
PERT 2017    
–
      
(2,784.7
 )    
–
  
Effect of application of IAS 29 (hyperinflation)    
(107.3
 )    
–
      
–
  
Others with reduced taxation    
(103.6
 )    
(721.0
 )    
325.0
  
Income tax and social contribution expense    
(1,789.6
 )    
(5,079.3
 )    
(315.0
 )
Effective tax rate    
13.59
 %    
39.28
 %    
2.35
 %