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Liabilities related to associates and joint ventures - Changes on the provisions (Details)
R$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2021
BRL (R$)
Dec. 31, 2020
USD ($)
Events with significant effect on the income statement      
Balance at the beginning $ 4,522    
Balance at the end 4,580   $ 4,522
Current liabilities 15,198   14,594
Non-current liabilities 38,938   42,592
Total liabilities 54,136   57,186
Fundao dam rupture and de-characterization of germano dam      
Events with significant effect on the income statement      
Balance at the beginning 2,074   1,700
Additional provision 1,700   1,095
Disbursements (392)   (394)
Present value valuation (91)   64
Translation adjustment (179)   (391)
Balance at the end 3,112   2,074
Current liabilities 1,785   876
Non-current liabilities 1,327   1,198
Total liabilities 3,112   2,074
Samarco      
Events with significant effect on the income statement      
Additional provision 1,519 R$ 8,476  
Current liabilities 10,902   8,370
Non-current liabilities 7,040   6,385
Total liabilities $ 17,942   $ 14,755