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Cash and cash equivalents (Details) - BRL (R$) R$ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Cash and Cash Equivalents [Line Items]
Cash and banks	R$ 5,293,540	R$ 6,561,558
Cash and cash equivalents	R$ 7,246,498	8,345,871	R$ 11,860,415	R$ 9,505,951
Cash and banks | Fixed
Cash and Cash Equivalents [Line Items]
Average yield p.a. %	5.26%
Domestic market (Brazil)
Cash and Cash Equivalents [Line Items]
Fixed-term deposits (compromised)	R$ 1,952,958	R$ 1,784,313
Domestic market (Brazil) | Fixed-term deposits | CDI
Cash and Cash Equivalents [Line Items]
Percentage of basis used to calculate interest rate	102.30%

X

- Definition

The amount of cash balances held at banks.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2023-01-01
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- 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
-Number 7
-IssueDate 2023-01-01
-Paragraph 45
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

A classification of cash equivalents representing short-term investments. [Refer: Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The percentage of the basis (reference rate) used for calculation of the interest rate.

+ References

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Cash and Cash Equivalents [Line Items]

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- Definition

Rate of interest on investment.

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