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Liabilities related to associates and joint ventures - Movements (Details)
R$ in Millions, $ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2021
BRL (R$)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Events with significant effect on the income statement          
Balance at beginning of the period     $ 3,989    
Balance at end of the period $ 4,021   4,021   $ 3,989
Current liabilities 14,335   14,335   14,594
Non-current liabilities 40,022   40,022   42,592
Total liabilities 54,357   54,357   57,186
Fundao dam rupture and de-characterization of germano dam          
Events with significant effect on the income statement          
Balance at beginning of the period     2,074 $ 1,700 1,700
Provision     560 566  
Payments     (137) (169)  
Present value valuation     (71) 40  
Translation adjustment     65 (468)  
Balance at end of the period 2,491   2,491 $ 1,669 2,074
Current liabilities 1,467   1,467   876
Non-current liabilities 1,024   1,024   1,198
Total liabilities 2,491   $ 2,491   $ 2,074
Renova Foundation          
Events with significant effect on the income statement          
Provision $ 560 R$ 2,820