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Liabilities related to associates and joint ventures (Tables)
 12 Months Ended
Dec. 31, 2022
IfrsStatementLineItems [Line Items]  
Schedule of changes on the provisions related to samarco dam failure
                       
    December 31, 2021   Income statement   Monetary and present value adjustments   Disbursements   Translation adjustments   December 31, 2022
Renova Foundation reparation and compensation programs   2,910   110   243   (338)   199   3,124
De-characterization of the Germano dam   202   (21)   1   -   15   197
Liabilities    3,112    89    244    (338)    214    3,321
                         
Current liabilities   1,785                   1,911
Non-current liabilities   1,327                   1,410
Liabilities    3,112                    3,321
                         
Discount rate in nominal terms   5.48% - 8.79%                   6.20% - 9.51%
Samarco [Member]  
IfrsStatementLineItems [Line Items]  
Summarized financial information of samarco
       
    December 31, 2022   December 31, 2021
Current assets   454   561
Non-current assets   2,748   2,921
Total assets   3,202   3,482
         
Current liabilities   10,808   10,902
Non-current liabilities   7,401   7,040
Total liabilities   18,209   17,942
Negative reserves   (15,007)   (14,460)
         
Net income (loss) for the year ended   11   (3,208)