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Basis of preparation of the financial statements - Presentation currency (Details)
 12 Months Ended
Dec. 31, 2020
R$ / $
Dec. 31, 2020
R$ / $
R$ / €
Dec. 31, 2020
R$ / $
R$ / $
Dec. 31, 2019
R$ / $
Dec. 31, 2019
R$ / $
R$ / €
Dec. 31, 2019
R$ / $
R$ / $
Dec. 31, 2018
R$ / $
Dec. 31, 2018
R$ / $
R$ / €
Dec. 31, 2018
R$ / $
R$ / $
Dec. 31, 2020
R$ / €
Dec. 31, 2020
R$ / $
Dec. 31, 2019
R$ / €
Dec. 31, 2019
R$ / $
Dec. 31, 2018
R$ / €
Dec. 31, 2018
R$ / $
Exchange rates used to translate operations                              
Closing rate 5.1967 5.1967 5.1967 4.0307 4.0307 4.0307 3.8748 3.8748 3.8748 6.3779 4.0771 4.5305 3.1034 4.4390 2.8451
Average rate 5.1578 5.8989 3.8480 3.9461 4.4159 2.9746 3.6558 4.3094 2.8190