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Stockholders' equity (Details 2) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Notes and other explanatory information [abstract]
Statutory net income	R$ 37,318	R$ 33,389	R$ 29,695
Legal reserve	(1,406)	(1,669)	(1,485)
Dividend calculation basis	35,912	31,720	28,210
Mandatory dividend	8,978	7,930	7,053
Dividends and Interest on Capital Paid / Accrued	R$ 25,724	R$ 21,468	R$ 8,368

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- Definition

A component of equity representing reserves created based on legal requirements.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

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