Financial assets at fair value through other comprehensive income - Securities (Details 2) - BRL (R$) R$ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
IfrsStatementLineItems [Line Items]
Gross carrying amount	R$ 6,960	R$ 8,571
Adjustments to fair value (in Stockholders' equity)	(817)	(3,686)
Fair Value	6,143	4,885
Negotiable Shares [Member]
IfrsStatementLineItems [Line Items]
Gross carrying amount	6,960	8,571
Adjustments to fair value (in Stockholders' equity)	(817)	(3,686)
Fair Value	R$ 6,143	R$ 4,885

The amount of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: At fair value [member]; Other comprehensive income]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 11A
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_11A_c&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 8
-Subparagraph h
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_8_h&doctype=Standard
-URIDate 2023-03-23

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant