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Financial Assets Held for Trading and Designated at Fair Value Through Profit or Loss - Summary of Financial Assets Designated 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
Disclosure of financial assets designated as measured at fair value through profit or loss [Line Items] |  |
Fair value | R$ 434,169 | R$ 465,581
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently, category [member] |  |
Disclosure of financial assets designated as measured at fair value through profit or loss [Line Items] |  |
Cost | 3,075 | 3,699
Fair value | 3,044 | 3,740
Financial assets at fair value through profit or loss, designated upon initial recognition or subsequently, category [member] | Brazilian external debt bonds [Member] |  |
Disclosure of financial assets designated as measured at fair value through profit or loss [Line Items] |  |
Cost | 3,075 | 3,699
Accumulated gain / (loss) reflected in income | (31) | 41
Fair value | R$ 3,044 | R$ 3,740

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- Definition The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_8_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The gains (losses) on financial assets at fair value through profit or loss. [Refer: Financial assets at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 20 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_20_a_i&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Disclosure of financial assets designated as measured at fair value through profit or loss. + References No definition available. + Details
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