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Liabilities related to associates and joint ventures - Movements (Details)
R$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Events with significant effect on the income statement      
Balance at beginning of the period R$ 1,916 $ 3,960  
Balance at end of the period R$ 3,989 4,220 $ 3,960
Current liabilities   14,594 13,845
Non-current liabilities   42,592 38,875
Total liabilities   57,186 52,720
Fundao dam rupture and de-characterization of germano dam      
Events with significant effect on the income statement      
Balance at beginning of the period   1,700 1,121
Provision   1,095 758
Disbursements   (394) (315)
Present value valuation   64 200
Translation adjustment   (391) (64)
Balance at end of the period   2,074 1,700
Current liabilities   876 516
Non-current liabilities   1,198 1,184
Total liabilities   2,074 $ 1,700
Renova Foundation      
Events with significant effect on the income statement      
Provision   $ 1,069