The amount of cash balances held at banks.

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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]

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

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

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Cash and Cash Equivalents [Line Items]

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Rate of interest on investment.

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Cash and cash equivalents (Details) - BRL (R$) R$ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Cash and Cash Equivalents [Line Items]
Cash and banks	R$ 6,086,977	R$ 9,881,326
Cash and cash equivalents	R$ 12,176,019	15,179,753	R$ 9,914,505	R$ 9,018,818
Cash and banks \| Fixed
Cash and Cash Equivalents [Line Items]
Average yield p.a. %	3.87%
Country of domicile
Cash and Cash Equivalents [Line Items]
Fixed-term deposits	R$ 3,434,978	3,204,403
Country of domicile \| Fixed-term deposits \| CDI
Cash and Cash Equivalents [Line Items]
Percentage of basis used to calculate interest rate	101.60%
Foreign countries
Cash and Cash Equivalents [Line Items]
Fixed-term deposits	R$ 2,654,064	R$ 2,094,024
Foreign countries \| Fixed-term deposits \| CDI
Cash and Cash Equivalents [Line Items]
Percentage of basis used to calculate interest rate	4.35%