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Financial assets at fair value through other comprehensive income - Securities (Details 3) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
IfrsStatementLineItems [Line Items]
Gains / (Losses)	R$ (1,534)	R$ (2,086)	R$ 1,107
Level 1 of fair value hierarchy [member]
IfrsStatementLineItems [Line Items]
Expected loss, beginning balance	(84)	(93)
Gains / (Losses)	(14)	3
Purchases	(16)	(2)
Expected loss, ending balance	(114)	(84)	(93)
Settlements		8
Level 1 of fair value hierarchy [member] | Brazilian government securities [member]
IfrsStatementLineItems [Line Items]
Expected loss, beginning balance	(36)	(36)
Expected loss, ending balance	(36)	(36)	(36)
Level 1 of fair value hierarchy [member] | Brazilian government securities [member] | Other [member]
IfrsStatementLineItems [Line Items]
Expected loss, beginning balance	(36)	(36)
Expected loss, ending balance	(36)	(36)	(36)
Level 1 of fair value hierarchy [member] | Government Securities [member]
IfrsStatementLineItems [Line Items]
Expected loss, beginning balance		(1)
Gains / (Losses)		1
Purchases	(1)
Expected loss, ending balance	(1)		(1)
Level 1 of fair value hierarchy [member] | Corporate Debt Securitie [Member]
IfrsStatementLineItems [Line Items]
Expected loss, beginning balance	(48)	(56)
Gains / (Losses)	(14)	2
Purchases	(15)	(2)
Expected loss, ending balance	(77)	(48)	(56)
Settlements		8
Level 1 of fair value hierarchy [member] | Corporate Debt Securitie [Member] | Other [member]
IfrsStatementLineItems [Line Items]
Expected loss, beginning balance	(3)	(3)
Gains / (Losses)	1
Purchases	(2)
Expected loss, ending balance	(4)	(3)	(3)
Level 1 of fair value hierarchy [member] | Corporate Debt Securitie [Member] | Rural Product Note [Member]
IfrsStatementLineItems [Line Items]
Expected loss, beginning balance
Gains / (Losses)	(1)
Expected loss, ending balance	(1)
Level 1 of fair value hierarchy [member] | Corporate Debt Securitie [Member] | Debentures [Member]
IfrsStatementLineItems [Line Items]
Expected loss, beginning balance	(44)	(44)
Gains / (Losses)	(1)
Expected loss, ending balance	(45)	(44)	(44)
Level 1 of fair value hierarchy [member] | Corporate Debt Securitie [Member] | Eurobonds and others [Member]
IfrsStatementLineItems [Line Items]
Expected loss, beginning balance	(1)	(9)
Gains / (Losses)	(13)	2
Purchases	(13)	(2)
Expected loss, ending balance	R$ (27)	(1)	R$ (9)
Settlements		R$ 8

X

- Definition

The gains (losses) recognised in other comprehensive income on financial assets measured at fair value through other comprehensive income applying paragraph 4.1.2A of IFRS 9, net of tax, before reclassification adjustments. [Refer: Financial assets measured at fair value through other comprehensive income; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
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-URIDate 2022-03-24

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- Definition

Financial assets at fair value through other comprehensive income expected loss.

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