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7. Cash and cash equivalents (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash And Cash Equivalents Details Abstract
Cash and banks	R$ 151,558	R$ 171,951
Cash equivalents	2,877,633	2,111,096
Cash and cash equivalents	R$ 3,029,191	R$ 2,283,047	R$ 1,886,221	R$ 1,639,214

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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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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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