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Fair Value of Financial Instruments - Summary of Breakdown of Fair Value Hierarchy Levels (Detail) - BRL (R$) R$ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | R$ 434,169 | R$ 465,581 |
Financial assets at fair value through other comprehensive income | 105,622 | 109,942 |
Financial assets designated at fair value through profit or loss | 3,044 | 3,740 |
Financial liabilities designated at fair value through profit or loss | 114 | 143 |
Other Financial Liabilities Designated At Fair Value Through Profit Or Loss | 161 | 5 |
Structured notes [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial liabilities designated at fair value through profit or loss | 114 | 143 |
Peru [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 8 |  |
Italy [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss |  | 130 |
Financial Assets Designated As At Fair Value Through Profit And Loss [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 361,923 | 385,331 |
Brazilian government securities [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 221,755 | 285,885 |
Financial assets at fair value through other comprehensive income | 69,642 | 67,949 |
Brazilian external debt bonds [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets designated at fair value through profit or loss | 3,044 | 3,740 |
Government securities - other countries [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 5,561 | 8,210 |
Financial assets at fair value through other comprehensive income | 30,194 | 34,402 |
Government securities - other countries [member] | Argentina [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 930 | 1,498 |
Financial assets at fair value through other comprehensive income | 405 |  |
Government securities - other countries [member] | Chile [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 837 | 840 |
Financial assets at fair value through other comprehensive income | 19,734 | 21,651 |
Government securities - other countries [member] | Colombia [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 1,059 | 3,603 |
Financial assets at fair value through other comprehensive income | 1,847 | 3,986 |
Government securities - other countries [member] | United States [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 2,671 | 2,085 |
Financial assets at fair value through other comprehensive income | 4,518 | 3,750 |
Government securities - other countries [member] | Mexico [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 19 | 5 |
Financial assets at fair value through other comprehensive income | 1,022 | 1,181 |
Government securities - other countries [member] | Paraguay [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 10 | 3 |
Financial assets at fair value through other comprehensive income | 1,459 | 2,947 |
Government securities - other countries [member] | Peru [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss |  | 5 |
Government securities - other countries [member] | Uruguay [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 27 | 41 |
Financial assets at fair value through other comprehensive income | 1,209 | 887 |
Government securities - other countries [member] | Other [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 1,261 | 640 |
Corporate debt securities [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 114,468 | 77,032 |
Financial assets at fair value through other comprehensive income | 5,786 | 7,591 |
Corporate debt securities [member] | Negotiable Shares [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 19,357 | 19,047 |
Financial assets at fair value through other comprehensive income | 743 | 1,382 |
Corporate debt securities [member] | Bank deposit certificates [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 150 | 729 |
Financial assets at fair value through other comprehensive income | 131 | 307 |
Corporate debt securities [member] | Real estate receivables certificates [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 1,012 | 548 |
Corporate debt securities [member] | Debentures [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 65,788 | 29,937 |
Financial assets at fair value through other comprehensive income | 351 | 889 |
Corporate debt securities [member] | Eurobonds and others [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 5,253 | 2,383 |
Financial assets at fair value through other comprehensive income | 4,498 | 5,013 |
Corporate debt securities [member] | Financial credit bills [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 10,111 | 15,783 |
Financial assets at fair value through other comprehensive income | 6 |  |
Corporate debt securities [member] | Promissory and Commercial notes [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 4,684 | 5,616 |
Corporate debt securities [member] | Other [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through other comprehensive income | 57 |  |
Corporate debt securities [member] | Rural product note [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 6,852 | 2,349 |
Corporate debt securities [member] | Other Financial Assets [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 157 | 6 |
Investment funds [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 20,139 | 14,204 |
Level 1 [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through other comprehensive income | 104,018 | 108,018 |
Financial assets designated at fair value through profit or loss | 3,044 | 3,740 |
Level 1 [Member] | Peru [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 8 |  |
Level 1 [Member] | Financial Assets Designated As At Fair Value Through Profit And Loss [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 259,868 | 312,572 |
Level 1 [Member] | Brazilian government securities [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 215,405 | 279,180 |
Financial assets at fair value through other comprehensive income | 68,457 | 66,701 |
Level 1 [Member] | Brazilian external debt bonds [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets designated at fair value through profit or loss | 3,044 | 3,740 |
Level 1 [Member] | Government securities - other countries [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 5,561 | 8,210 |
Financial assets at fair value through other comprehensive income | 30,194 | 34,402 |
Level 1 [Member] | Government securities - other countries [member] | Argentina [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 930 | 1,498 |
Financial assets at fair value through other comprehensive income | 405 |  |
Level 1 [Member] | Government securities - other countries [member] | Chile [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 837 | 840 |
Financial assets at fair value through other comprehensive income | 19,734 | 21,651 |
Level 1 [Member] | Government securities - other countries [member] | Colombia [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 1,059 | 3,603 |
Financial assets at fair value through other comprehensive income | 1,847 | 3,986 |
Level 1 [Member] | Government securities - other countries [member] | United States [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 2,671 | 2,085 |
Financial assets at fair value through other comprehensive income | 4,518 | 3,750 |
Level 1 [Member] | Government securities - other countries [member] | Mexico [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 19 | 5 |
Financial assets at fair value through other comprehensive income | 1,022 | 1,181 |
Level 1 [Member] | Government securities - other countries [member] | Paraguay [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 10 | 3 |
Financial assets at fair value through other comprehensive income | 1,459 | 2,947 |
Level 1 [Member] | Government securities - other countries [member] | Peru [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss |  | 5 |
Level 1 [Member] | Government securities - other countries [member] | Uruguay [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 27 | 41 |
Financial assets at fair value through other comprehensive income | 1,209 | 887 |
Level 1 [Member] | Government securities - other countries [member] | Other [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 12 | 85 |
Level 1 [Member] | Government securities - other countries [member] | Italy [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss |  | 130 |
Level 1 [Member] | Corporate debt securities [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 38,249 | 24,606 |
Financial assets at fair value through other comprehensive income | 5,367 | 6,915 |
Level 1 [Member] | Corporate debt securities [member] | Negotiable Shares [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 14,355 | 14,176 |
Financial assets at fair value through other comprehensive income | 743 | 1,382 |
Level 1 [Member] | Corporate debt securities [member] | Bank deposit certificates [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through other comprehensive income |  | 109 |
Level 1 [Member] | Corporate debt securities [member] | Debentures [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 18,638 | 7,962 |
Financial assets at fair value through other comprehensive income | 134 | 419 |
Level 1 [Member] | Corporate debt securities [member] | Eurobonds and others [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 5,244 | 2,383 |
Financial assets at fair value through other comprehensive income | 4,490 | 5,005 |
Level 1 [Member] | Investment funds [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 653 | 576 |
Level 2 [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through other comprehensive income | 1,604 | 1,924 |
Financial liabilities designated at fair value through profit or loss | 114 | 143 |
Other Financial Liabilities Designated At Fair Value Through Profit Or Loss | 161 | 5 |
Level 2 [Member] | Structured notes [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial liabilities designated at fair value through profit or loss | 114 | 143 |
Level 2 [Member] | Real estate receivables certificates [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 1,009 |  |
Level 2 [Member] | Financial Assets Designated As At Fair Value Through Profit And Loss [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 100,492 | 70,791 |
Level 2 [Member] | Brazilian government securities [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 6,350 | 6,705 |
Financial assets at fair value through other comprehensive income | 1,185 | 1,248 |
Level 2 [Member] | Government securities - other countries [member] | Other [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 1,249 |  |
Level 2 [Member] | Corporate debt securities [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 74,656 | 50,458 |
Financial assets at fair value through other comprehensive income | 419 | 676 |
Level 2 [Member] | Corporate debt securities [member] | Negotiable Shares [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 5,002 | 4,871 |
Level 2 [Member] | Corporate debt securities [member] | Bank deposit certificates [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 150 | 729 |
Financial assets at fair value through other comprehensive income | 131 | 198 |
Level 2 [Member] | Corporate debt securities [member] | Debentures [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 45,672 | 20,625 |
Financial assets at fair value through other comprehensive income | 217 | 470 |
Level 2 [Member] | Corporate debt securities [member] | Eurobonds and others [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 1 |  |
Financial assets at fair value through other comprehensive income | 8 | 8 |
Level 2 [Member] | Corporate debt securities [member] | Financial credit bills [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 10,098 | 15,777 |
Financial assets at fair value through other comprehensive income | 6 |  |
Level 2 [Member] | Corporate debt securities [member] | Promissory and Commercial notes [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 4,684 | 5,616 |
Level 2 [Member] | Corporate debt securities [member] | Other [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through other comprehensive income | 57 |  |
Level 2 [Member] | Corporate debt securities [member] | Rural product note [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 6,791 | 2,285 |
Level 2 [Member] | Corporate debt securities [member] | Other Financial Assets [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 157 | 6 |
Level 2 [Member] | Corporate debt securities [member] | Other [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss |  | 555 |
Level 2 [Member] | Investment funds [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 19,486 | 13,628 |
Level 3 [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 1,563 | 1,968 |
Financial assets at fair value through other comprehensive income |  |  | R$ 34
Level 3 [Member] | Financial Assets Designated As At Fair Value Through Profit And Loss [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 1,563 | 1,968 |
Level 3 [Member] | Corporate debt securities [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 1,563 | 1,968 |
Level 3 [Member] | Corporate debt securities [member] | Real estate receivables certificates [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 3 | 548 |
Level 3 [Member] | Corporate debt securities [member] | Debentures [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 1,478 | 1,350 |
Level 3 [Member] | Corporate debt securities [member] | Eurobonds and others [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 8 |  |
Level 3 [Member] | Corporate debt securities [member] | Financial credit bills [member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | 13 | 6 |
Level 3 [Member] | Corporate debt securities [member] | Rural product note [Member] |  |  |
Disclosure of financial assets measured at fair value [line items] |  |  |
Financial assets at fair value through profit or loss | R$ 61 | R$ 64 |

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