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7 Cash and cash equivalents (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash and cash equivalents [abstract]
Cash and banks	R$ 74,033	R$ 176,497
Cash equivalents	322,368	2,076,713
Cash and cash equivalents	R$ 396,401	R$ 2,253,210	R$ 3,029,191	R$ 2,283,047

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- Definition

The amount of cash on hand and demand deposits. [Refer: Cash on hand]

+ References

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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

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- Definition

The amount of 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.

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