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Financial Assets at Fair Value Through Other Comprehensive Income-Securities - Summary of Reconciliation of Expected Loss for Financial Assets at Fair Value Through Other Comprehensive Instrument-Securities, Segregated by Stages (Detail) - BRL (R$) R$ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financial assets at fair value through other comprehensive income [line items]
Gains / (Losses)	R$ (628)	R$ 254	R$ 128
Level 1 [Member]
Financial assets at fair value through other comprehensive income [line items]
Expected loss, beginning balance	(85)	(84)
Gains / (Losses)		(1)
Purchases	(1)	(2)
Settlements		2
Expected loss, ending balance	(86)	(85)	(84)
Level 1 [Member] | Brazilian government securities [member]
Financial assets at fair value through other comprehensive income [line items]
Expected loss, beginning balance	(36)	(36)
Expected loss, ending balance	(36)	(36)	(36)
Level 1 [Member] | Corporate debt securities [member]
Financial assets at fair value through other comprehensive income [line items]
Expected loss, beginning balance	(49)	(48)
Gains / (Losses)	2	(1)
Purchases		(2)
Settlements		2
Expected loss, ending balance	(47)	(49)	(48)
Level 1 [Member] | Government securities - abroad [member]
Financial assets at fair value through other comprehensive income [line items]
Gains / (Losses)	(2)
Purchases	(1)
Expected loss, ending balance	(3)
Level 1 [Member] | Other [member] | Brazilian government securities [member]
Financial assets at fair value through other comprehensive income [line items]
Expected loss, beginning balance	(36)	(36)
Expected loss, ending balance	(36)	(36)	(36)
Level 1 [Member] | Other [member] | Corporate debt securities [member]
Financial assets at fair value through other comprehensive income [line items]
Expected loss, beginning balance	(3)	(3)
Expected loss, ending balance	(3)	(3)	(3)
Level 1 [Member] | Debentures [member]
Financial assets at fair value through other comprehensive income [line items]
Expected loss, beginning balance	(43)	(43)
Expected loss, ending balance	(43)	(43)	(43)
Level 1 [Member] | Eurobonds and others [member]
Financial assets at fair value through other comprehensive income [line items]
Expected loss, beginning balance	(3)	(2)
Gains / (Losses)	2	(1)
Purchases		(2)
Settlements		2
Expected loss, ending balance	R$ (1)	R$ (3)	R$ (2)

X

- Definition

The gains (losses) recognised in other comprehensive income on financial assets measured at fair value through other comprehensive income, net of tax. [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 2019-01-01
-Paragraph 91
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