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Costs and expenses by nature - Tax on mineral production (Details) - bbl
 1 Months Ended 6 Months Ended
Mar. 31, 2021
Jun. 30, 2021
Disclosure of operating segments [line items]    
Increase in state decree rate per metric ton 11.19  
Until the production of 10 million metric tons    
Disclosure of operating segments [line items]    
Rates per metric ton   3.72
Over the production of 10 million metric tons    
Disclosure of operating segments [line items]    
Rates per metric ton 0.74  
Minimum    
Disclosure of operating segments [line items]    
Rates per metric ton   0.50
Maximum    
Disclosure of operating segments [line items]    
Rates per metric ton   3.72