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Note 12 - Income Tax and Social Contribution (Tables)
 12 Months Ended
Dec. 31, 2017
Statement Line Items [Line Items]  
Disclosure of income tax [text block]
    2017     2016     2015  
Income tax expense - current    
(5,332.3
 )    
(413.9
 )    
(1,227.8
 )
                         
Deferred tax expense on temporary differences    
891.9
      
(732.5
 )    
(2,192.4
 )
Deferred tax over taxes losses carryforwards movements  in the current period    
(638.9
 )    
831.4
      
(214.0
 )
Total deferred tax (expense)/income    
253.0
      
98.9
      
(2,406.4
 )
                         
Total income tax expenses    
(5,079.3
 )    
(315.0
 )    
(3,634.2
 )
Disclosure of reconciliation from the weighted nominal to the effective tax rate [text block]
    2017     2016     2015  
Income before tax    
12,929.8
      
13,398.4
      
16,513.4
  
Adjustment on taxable basis                        
Non-taxable income    
(310.9
 )    
(392.0
 )    
(999.9
 )
Government grants related to sales taxes    
(1,889.1
 )    
(1,528.6
 )    
(1,360.7
 )
Share of results of joint ventures    
3.1
      
5.0
      
(3.1
 )
Non-deductible expenses    
91.1
      
539.3
      
415.9
  
Complement of income tax of foreign subsidiaries due in Brazil    
560.4
      
148.0
      
1,965.2
  
Results of intercompany transactions non-taxable/not deductible in Brazil    
(547.5
 )    
640.7
      
(1,313.2
 )
     
10,836.9
      
12,810.8
      
15,217.6
  
Aggregated weighted nominal tax rate    
29.22
 %    
30.16
 %    
31.59
 %
Taxes payable – nominal rate    
(3,166.6
 )    
(3,864.0
 )    
(4,806.9
 )
Adjustment on tax expense                        
Regional incentives - income taxes    
304.6
      
264.5
      
257.8
  
Deductible interest on shareholders' equity    
1,649.0
      
1,867.7
      
1,646.1
  
Tax savings from goodwill amortization on tax books    
175.2
      
142.0
      
142.4
  
Withholding tax over undistributed profits    
(356.9
 )    
153.1
      
(672.4
 )
Recognition / write-off of deferred charges on tax losses    
(178.9
 )    
796.7
      
138.1
  
PERT 2017    
(2,784.7
 )    
-
      
-
  
Others with reduced taxation    
(721.0
 )    
325.0
      
(339.3
 )
Income tax and social contribution expense    
(5,079.3
 )    
(315.0
 )    
(3,634.2
 )
Effective tax rate    
39.28
 %    
2.35
 %    
22.01
 %