Risk and Capital Management - Summary of Financial Assets Individually Evaluated Classified by Rating (Parenthetical) (Detail) - BRL (R$) R$ in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure of financial assets individually evaluated classified by rating[Abstract]
Derivatives	R$ 69,045	R$ 76,504

The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 55
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-URIDate 2021-03-24

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