Schedule of post-employment health care plan amounts (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
IfrsStatementLineItems [Line Items]
Actuarial liabilities	R$ 584,288	R$ 758,426
Post Employment Healthcare Benefits [Member]
IfrsStatementLineItems [Line Items]
Present value of obligations	584,288	678,880	R$ 892,396
Actuarial liabilities	R$ 584,288	R$ 678,880	R$ 892,396	R$ 897,137

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 57
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_57_a&doctype=Standard
-URIDate 2021-03-24

Name:	ifrs-full_DefinedBenefitObligationAtPresentValue
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant