Basis of preparation of financial statements - Presentation currency (Details)	12 Months Ended
Dec. 31, 2021 R$ / $	Dec. 31, 2021 R$ / $ R$ / $	Dec. 31, 2021 R$ / $ R$ / €	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, 2021 R$ / $	Dec. 31, 2021 R$ / €	Dec. 31, 2020 R$ / $	Dec. 31, 2020 R$ / €	Dec. 31, 2019 R$ / $	Dec. 31, 2019 R$ / €
Exchange rates used to translate operations
Closing rate	5.5805	5.5805	5.5805	5.1967	5.1967	5.1967	4.0307	4.0307	4.0307	4.3882	6.3210	4.0771	6.3779	3.1034	4.5305
Average rate	5.3956	4.3042	6.3784	5.1578	3.8480	5.8989	3.9461	2.9746	4.4159

The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2021-03-24

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant