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Basis of preparation of the interim financial statements - Presentation currency (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
R$ / $
Jun. 30, 2021
R$ / $
R$ / $
Jun. 30, 2021
R$ / $
R$ / €
Jun. 30, 2020
R$ / $
Jun. 30, 2020
R$ / $
Jun. 30, 2020
R$ / €
Jun. 30, 2021
R$ / $
Jun. 30, 2021
R$ / $
R$ / $
Jun. 30, 2021
R$ / $
R$ / €
Jun. 30, 2020
R$ / $
Jun. 30, 2020
R$ / $
Jun. 30, 2020
R$ / €
Jun. 30, 2021
R$ / $
Jun. 30, 2021
R$ / €
Dec. 31, 2020
R$ / $
Dec. 31, 2020
R$ / $
Dec. 31, 2020
R$ / €
Exchange rates used to translate operations                                  
Closing rate 5.0022 5.0022 5.0022       5.0022 5.0022 5.0022       4.0334 5.9276 5.1967 4.0771 6.3779
Average rate 5.2907 4.3096 6.3789 5.3854 3.8882 5.9279 5.3862 4.3209 6.4902 4.9218 3.5992 5.4211