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Provisions - Asset retirement obligations (Details)
R$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Change in the provision for asset retirement obligations      
Balance at beginning of the period R$ 1,916 $ 3,960  
Balance at end of the period R$ 3,989 4,220 $ 3,960
Asset retirement obligations      
Provisions, current liabilities   1,826 1,230
Provisions, non-current liabilities   8,434 8,493
Asset retirement obligations      
Change in the provision for asset retirement obligations      
Balance at beginning of the period   3,960 3,115
Present value valuation   27 37
Settlements   (45) (47)
Revisions on cash flows estimates   509 812
Translation adjustment   (231) 43
Balance at end of the period   4,220 3,960
Asset retirement obligations      
Provisions, current liabilities   99 158
Provisions, non-current liabilities   $ 4,121 $ 3,802