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Interest and similar income and expenses and Income of financial assets and liabilities at fair value through profit or loss - Summary of Income of Financial Assets and Liabilities at Fair Value through Profit or Loss (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of financial assets and liabilities measured at fair value [Line Items] |  |  |
Income of financial assets and liabilities at fair value through profit or loss | R$ 16,678 | R$ 6,553 | R$ 26,230
Derivatives [member] |  |  |
Disclosure of financial assets and liabilities measured at fair value [Line Items] |  |  |
Income of financial assets and liabilities at fair value through profit or loss | 9,716 | (9,393) | (70)
Financial Assets Designated At Fair Value Through Profit Or Loss Equity Securities [member] |  |  |
Disclosure of financial assets and liabilities measured at fair value [Line Items] |  |  |
Income of financial assets and liabilities at fair value through profit or loss | (483) | (118) | (64)
Securities [member] |  |  |
Disclosure of financial assets and liabilities measured at fair value [Line Items] |  |  |
Income of financial assets and liabilities at fair value through profit or loss | 7,439 | 16,035 | 26,388
Other financial assets at fair value through profit or loss [member] |  |  |
Disclosure of financial assets and liabilities measured at fair value [Line Items] |  |  |
Income of financial assets and liabilities at fair value through profit or loss | 838 |  |
Financial liabilities at fair value through profit or loss, category [member] |  |  |
Disclosure of financial assets and liabilities measured at fair value [Line Items] |  |  |
Income of financial assets and liabilities at fair value through profit or loss | (843) | (9) |
Financial Liability designated at fair value [Member] |  |  |
Disclosure of financial assets and liabilities measured at fair value [Line Items] |  |  |
Income of financial assets and liabilities at fair value through profit or loss | R$ 11 | R$ 38 | R$ (24)

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- Definition Adjustments for gains (losses) on changes in the fair value of derivatives to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: At fair value [member]; Derivatives [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_20&doctype=Standard -URIDate 2021-03-24 + Details
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