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Brumadinho dam failure - De-characterization of the upstream dams (Details)
R$ in Millions, $ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Provisions.              
Balance at beginning of the period     R$ 1,916 $ 3,960      
Balance at end of the period R$ 3,989 $ 4,220 3,989 4,220 R$ 1,916 $ 3,960  
Judicial deposits released     6,900 1,313      
Total economic value 7,777   7,777       $ 1,701
Expense incurred in relation to Brumadinho event       510   730  
Brumadinho event              
Provisions.              
Balance at beginning of the period       5,472      
Impact on the income statement       5,257      
Present value adjustment       41      
Disbursements       (2,632)      
Translation adjustment       (1,274)      
Balance at end of the period           5,472  
Global Settlement for Brumadinho              
Provisions.              
Impact on the income statement     19,924 3,872      
Disbursements | R$         R$ 6,885    
Judicial deposits released R$ 1,500 274 R$ 5,400 1,039      
Global Settlement for Brumadinho | Brumadinho event              
Provisions.              
Balance at beginning of the period       1,916      
Impact on the income statement       3,872      
Present value adjustment       (5)      
Disbursements       (1,325)   1,720  
Translation adjustment       (469)      
Balance at end of the period           1,916  
Provision for individual indemnification and other commitments | Brumadinho event              
Provisions.              
Balance at beginning of the period       1,067      
Impact on the income statement       258      
Present value adjustment       10      
Disbursements       (504)      
Translation adjustment       (245)      
Balance at end of the period           1,067  
De-characterization of dams | Brumadinho event              
Provisions.              
Balance at beginning of the period       2,489      
Impact on the income statement       617      
Present value adjustment       36      
Disbursements       (293)      
Translation adjustment       (560)      
Balance at end of the period           $ 2,489  
Incurred expenses | Brumadinho event              
Provisions.              
Impact on the income statement       510      
Disbursements       (510)      
Samarco | De-characterization of upstream structures | Brumadinho event              
Provisions.              
Balance at end of the period   6,864   6,864      
Samarco | Global Settlement for Brumadinho | Brumadinho event              
Provisions.              
Balance at end of the period   3,989   3,989      
Samarco | Provision for individual indemnification and other commitments | Brumadinho event              
Provisions.              
Balance at end of the period   586   586      
Samarco | De-characterization of dams | Brumadinho event              
Provisions.              
Balance at end of the period   $ 2,289   $ 2,289