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Financial Assets at Fair Value Through Profit or Loss - Summary of Financial Assets at Fair Value Through Profit or Loss (Parenthetical) (Detail) - BRL (R$) R$ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of financial assets at fair value through profit or loss [line items]
Securities pledged as Guarantee of Funding of Financial Institutions and Clients	R$ 33,848	R$ 27,469
Brazilian government securities [member]
Disclosure of financial assets at fair value through profit or loss [line items]
Securities pledged as Guarantee of Funding of Financial Institutions and Clients	24,988	26,953
Brazilian government securities [member] | Held-for-trading financial assets [Member]
Disclosure of financial assets at fair value through profit or loss [line items]
Securities pledged as Guarantee of Funding of Financial Institutions and Clients	30,114	30,325
Government securities - abroad [member]
Disclosure of financial assets at fair value through profit or loss [line items]
Securities pledged as Guarantee of Funding of Financial Institutions and Clients		479
Government securities - abroad [member] | Held-for-trading financial assets [Member]
Disclosure of financial assets at fair value through profit or loss [line items]
Securities pledged as Guarantee of Funding of Financial Institutions and Clients	131	46
Corporate securities [member]
Disclosure of financial assets at fair value through profit or loss [line items]
Securities pledged as Guarantee of Funding of Financial Institutions and Clients	8,860	37
Corporate securities [member] | Held-for-trading financial assets [Member]
Disclosure of financial assets at fair value through profit or loss [line items]
Securities pledged as Guarantee of Funding of Financial Institutions and Clients	R$ 30,245	R$ 30,399

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- Definition

The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Contingent liabilities [member]; Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 14
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_14_a&doctype=Standard
-URIDate 2017-03-09

+ Details

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X

- Definition

Disclosure of financial assets at fair value through profit or loss.

+ References

No definition available.

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