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Financial Assets at Fair Value Through Profit or Loss - Summary of Financial Assets at Fair Value Through Profit or Loss (Detail) - Held-for-trading financial assets [Member] - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | R$ 365,586 | R$ 385,999
Accumulated gain / (loss) reflected in income | [1] | (3,663) | (668)
Fair value |  | 361,923 | 385,331
Investment funds [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | 20,130 | 15,407
Accumulated gain / (loss) reflected in income | [1] | 9 | (1,203)
Fair value |  | 20,139 | 14,204
Brazilian government securities [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost | [2] | 223,529 | 284,280
Accumulated gain / (loss) reflected in income | [2] | (1,774) | 1,605
Fair value | [2] | 221,755 | 285,885
Government securities - abroad [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost | [2] | 5,581 | 8,199
Accumulated gain / (loss) reflected in income | [2] | (20) | 11
Fair value | [2] | 5,561 | 8,210
Corporate securities [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost | [2] | 116,346 | 78,113
Accumulated gain / (loss) reflected in income | [2] | (1,878) | (1,081)
Fair value | [2] | 114,468 | 77,032
Argentina [Member] | Government securities - abroad [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | 901 | 1,480
Accumulated gain / (loss) reflected in income | [1] | 29 | 18
Fair value |  | 930 | 1,498
Chile [member] | Government securities - abroad [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | 839 | 839
Accumulated gain / (loss) reflected in income | [1] | (2) | 1
Fair value |  | 837 | 840
Colombia [member] | Government securities - abroad [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | 1,071 | 3,599
Accumulated gain / (loss) reflected in income | [1] | (12) | 4
Fair value |  | 1,059 | 3,603
United States [member] | Government securities - abroad [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | 2,706 | 2,096
Accumulated gain / (loss) reflected in income | [1] | (35) | (11)
Fair value |  | 2,671 | 2,085
Mexico [Member] | Government securities - abroad [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | 19 | 5
Fair value |  | 19 | 5
Paraguay [member] | Government securities - abroad [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | 10 | 3
Fair value |  | 10 | 3
Peru [Member] | Government securities - abroad [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | 8 | 4
Accumulated gain / (loss) reflected in income | [1] |  | 1
Fair value |  | 8 | 5
Uruguay [member] | Government securities - abroad [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | 27 | 40
Accumulated gain / (loss) reflected in income | [1] |  | 1
Fair value |  | 27 | 41
ITALY | Government securities - abroad [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | 0 | 133
Accumulated gain / (loss) reflected in income | [1] |  | (3)
Fair value |  |  | 130
Other [Member] | Government securities - abroad [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  |  | 654
Fair value |  |  | 640
Negotiable shares [member] | Corporate securities [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | 20,293 | 20,063
Accumulated gain / (loss) reflected in income | [1] | (936) | (1,016)
Fair value |  | 19,357 | 19,047
Rural product note [Member] | Corporate securities [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | 6,752 | 2,371
Accumulated gain / (loss) reflected in income | [1] | 100 | (22)
Fair value |  | 6,852 | 2,349
Bank deposit certificates [member] | Corporate securities [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | 150 | 729
Fair value |  | 150 | 729
Real estate receivables certificates [member] | Corporate securities [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | 1,075 | 561
Accumulated gain / (loss) reflected in income | [1] | (63) | (13)
Fair value |  | 1,012 | 548
Debentures [member] | Corporate securities [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | 66,730 | 30,022
Accumulated gain / (loss) reflected in income | [1] | (942) | (85)
Fair value |  | 65,788 | 29,937
Eurobonds and others [member] | Corporate securities [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | 5,293 | 2,341
Accumulated gain / (loss) reflected in income | [1] | (40) | 42
Fair value |  | 5,253 | 2,383
Financial bills [Member] | Corporate securities [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | 10,128 | 15,784
Accumulated gain / (loss) reflected in income | [1] | (17) | (1)
Fair value |  | 10,111 | 15,783
Promissory and Commercial notes [Member] | Corporate securities [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | 4,655 | 5,588
Accumulated gain / (loss) reflected in income | [1] | 29 | 28
Fair value |  | 4,684 | 5,616
Other [member] | Corporate securities [member] |  |  |
Disclosure of financial assets at fair value through profit or loss [line items] |  |  |
Cost |  | 1,270 |
Accumulated gain / (loss) reflected in income | [1] | (9) | R$ (14)
Fair value |  | R$ 1,261 |
[1] | In the period, the result of Adjustment to Fair Value of Financial Assets (particularly private securities) had their amounts affected by oscillations of rates and other market variables arising from the impact of the COVID-19 pandemic on the macroeconomic scenario in the period (Note 33a).
[2] | Financial assets at fair value through profit or loss – Securities pledged as Guarantee of Funding of Financial Institutions and Customers were: a) R$ 50,116 (R$ 12,181 at 12/31/2020), b) R$ 171 (R$ 765 at 12/31/2020) and c) R$ 15,984 (R$ 8,556 at 12/31/2020), totaling R$ 66,271 (R$ 21,502 at 12/31/2020).

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- Definition The amount of financial assets at fair value through profit or loss classified as held for trading. A financial asset is classified as held for trading if: (a) it is acquired principally for the purpose of selling it in the near term; (b) on initial recognition it is part of a portfolio of identified financial instruments that are managed together and for which there is evidence of a recent actual pattern of short-term profit-taking; or (c) it is a derivative (except for a derivative that is a financial guarantee contract or a designated and effective hedging instrument). [Refer: At fair value [member]; Financial assets at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -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-2017-en-b&anchor=para_8_a&doctype=Standard&book=b -URIDate 2021-03-24 + Details
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- Definition The gains (losses) on financial assets at fair value through profit or loss classified as held for trading. [Refer: Financial assets at fair value through profit or loss, classified as held for trading; Gains (losses) on financial assets at fair value through profit or loss] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -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-2017-en-b&anchor=para_20_a_i&doctype=Standard&book=b -URIDate 2021-03-24 + Details
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