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Cash and cash equivalents - cash and cash equivalents (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash and cash equivalents
Cash and cash equivalents in national currency	R$ 444,212	R$ 474,395
Cash and cash equivalents in foreign currency	20,643	27,595
Reverse repurchase agreements* (90 days)	35,591	1,652,697
Total of cash and cash equivalents	R$ 500,446	R$ 2,154,687	R$ 3,114,789	R$ 1,546,065

X

- Definition

The amount of cash and cash equivalents in national currency.

+ References

No definition available.

+ Details

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X

- Definition

The amount of cash and cash equivalents in foreign currency.

+ References

No definition available.

+ Details

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Namespace Prefix:	b3_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2021-01-01
-Paragraph 45
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-URIDate 2021-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2021-01-01
-Paragraph B13
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-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B
-URIDate 2021-03-24

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-Paragraph 54
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- References

No definition available.

+ Details

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X

- Definition

The amount of instruments purchased for resale in reverse repurchase agreements and cash collateral on securities borrowed. [Refer: Repurchase agreements and cash collateral on securities lent]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard
-URIDate 2021-03-24

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