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Liabilities related to associates and joint ventures - Additional Information (Details)
R$ in Millions, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2021
BRL (R$)
Mar. 31, 2021
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Framework agreement                
Equity results and other results in associates and joint ventures $ (454)     $ (535)   $ (470) $ (701)  
Samarco                
Framework agreement                
Proceeds from debt used for working capital 0   $ 21 $ 20 $ 56      
Short-term facilities available for operations 64         64    
Equity results and other results in associates and joint ventures           33    
De-characterization of Germano dam                
Framework agreement                
Provision           $ 225   $ 221
Renova Foundation                
Framework agreement                
Provision $ 560 R$ 2,820