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Litigations - Changes (Details)
R$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Litigation        
Balance at beginning of the period R$ 1,916 $ 3,960    
Balance at end of the period R$ 3,989 4,220 $ 3,960  
Provisions, current liabilities   1,826 1,230  
Provisions, non-current liabilities   8,434 8,493  
Legal proceedings reserved   423 536  
Legal proceedings guaranteed   487 616  
Provision for litigations        
Litigation        
Balance at beginning of the period   1,462 1,357  
Additions and reversals, net   73 291 $ 185
Disbursements   112 (201)  
Indexation and interest   (28) 70  
Translation adjustment   (304) (55)  
Balance at end of the period   1,091 1,462 1,357
Provisions, current liabilities   87    
Provisions, non-current liabilities   1,004 1,462  
Provisions   1,091    
Tax litigation        
Litigation        
Balance at beginning of the period   696 729  
Additions and reversals, net   29 10  
Disbursements   23 (33)  
Indexation and interest   (85) 9  
Translation adjustment   (132) (19)  
Balance at end of the period   485 696 729
Provisions, current liabilities   8    
Provisions, non-current liabilities   477    
Provisions   485    
Civil litigation        
Litigation        
Balance at beginning of the period   300 166  
Additions and reversals, net   26 168  
Disbursements   30 (58)  
Indexation and interest   30 42  
Translation adjustment   (66) (18)  
Balance at end of the period   260 300 166
Provisions, current liabilities   15    
Provisions, non-current liabilities   246    
Provisions   260    
Labor litigation        
Litigation        
Balance at beginning of the period   455 459  
Additions and reversals, net   16 106  
Disbursements   59 (110)  
Indexation and interest   26 18  
Translation adjustment   (103) (18)  
Balance at end of the period   335 455 459
Provisions, current liabilities   64    
Provisions, non-current liabilities   271    
Provisions   335    
Environmental litigation        
Litigation        
Balance at beginning of the period   11 3  
Additions and reversals, net   2 7  
Disbursements   0    
Indexation and interest   1 1  
Translation adjustment   (3)    
Balance at end of the period   11 $ 11 $ 3
Provisions, non-current liabilities   11    
Provisions   $ 11