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Stockholders' equity - Company's remuneration policy (Details)
R$ / shares in Units, R$ in Millions, $ in Millions
 1 Months Ended 6 Months Ended 12 Months Ended
Jul. 29, 2020
Sep. 30, 2020
BRL (R$)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
BRL (R$)
R$ / shares
Dec. 31, 2019
USD ($)
Jun. 30, 2020
BRL (R$)
R$ / shares
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Stockholders' equity                
Percentage of adjusted EBITDA less capital expenditures 30.00%              
Remuneration - Interest on capital       R$ 7,253 $ 1,324     $ 1,767
Dividends recognised as distributions to owners   R$ 18,637 $ 3,350     R$ 12,350 $ 2,191  
Remuneration (in dollars per share)           R$ 2.407510720    
Stockholders' remuneration based on interest on capital       R$ 6,287 $ 1,159      
Interest on capital (in dollars per share)       R$ 1.414364369        
Income tax amount paid | $               $ 165