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Financial Assets at Fair Value Through Other Comprehensive Income-Securities - Summary of Fair Value and Corresponding Gross Carrying Amount of Financial Assets at Fair Value Through Other Comprehensive Income-Securities Assets (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | R$ 108,555 | R$ 107,435 |
Fair value adjustments (in stockholders' equity) | (2,849) | 2,600 | [1]
Expected loss | (84) | (93) |
Fair value | 105,622 | 109,942 |
Brazilian government securities [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 71,298 | 65,235 |
Fair value adjustments (in stockholders' equity) | (1,656) | 2,714 | [1]
Fair value | 69,642 | 67,949 |
Government securities - abroad [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 30,507 | 34,365 |
Fair value adjustments (in stockholders' equity) | (313) | 38 | [1]
Expected loss | 0 | (1) |
Fair value | 30,194 | 34,402 |
Corporate debt securities [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 6,714 | 7,799 |
Fair value adjustments (in stockholders' equity) | (880) | (152) | [1]
Expected loss | (48) | (56) |
Fair value | 5,786 | 7,591 |
Colombia [member] | Government securities - abroad [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 1,942 | 3,913 |
Fair value adjustments (in stockholders' equity) | (95) | 73 | [1]
Fair value | 1,847 | 3,986 |
Chile [member] | Government securities - abroad [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 19,885 | 21,639 |
Fair value adjustments (in stockholders' equity) | (151) | 12 | [1]
Fair value | 19,734 | 21,651 |
United States [member] | Government securities - abroad [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 4,520 | 3,751 |
Fair value adjustments (in stockholders' equity) | (2) | (1) | [1]
Fair value | 4,518 | 3,750 |
Paraguay [member] | Government securities - abroad [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 1,516 | 3,008 |
Fair value adjustments (in stockholders' equity) | (57) | (60) | [1]
Expected loss | 0 | (1) |
Fair value | 1,459 | 2,947 |
Uruguay [member] | Government securities - abroad [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 1,207 | 874 |
Fair value adjustments (in stockholders' equity) | 2 | 13 | [1]
Expected loss |  | 0 |
Fair value | 1,209 | 887 |
Mexico [Member] | Government securities - abroad [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 1,028 | 1,180 |
Fair value adjustments (in stockholders' equity) | (6) | 1 | [1]
Fair value | 1,022 | 1,181 |
ARGENTINA | Government securities - abroad [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 409 |  |
Fair value adjustments (in stockholders' equity) | (4) |  |
Fair value | 405 |  |
Other [member] | Brazilian government securities [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 36 | 36 |
Fair value adjustments (in stockholders' equity) | 0 |  |
Expected loss | (36) | (36) |
Other [member] | Corporate debt securities [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 57 | 3 |
Fair value adjustments (in stockholders' equity) | 3 |  |
Expected loss | (3) | (3) |
Fair value | 57 |  |
Shares [member] | Corporate debt securities [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 1,629 | 1,640 |
Fair value adjustments (in stockholders' equity) | (886) | (258) | [1]
Fair value | 743 | 1,382 |
Bank deposit certificates [member] | Corporate debt securities [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 132 | 305 |
Fair value adjustments (in stockholders' equity) | (1) | 2 | [1]
Fair value | 131 | 307 |
Debentures [member] | Corporate debt securities [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 392 | 956 |
Fair value adjustments (in stockholders' equity) | 3 | (23) | [1]
Expected loss | (44) | (44) |
Fair value | 351 | 889 |
Eurobonds and others [member] | Corporate debt securities [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 4,498 | 4,895 |
Fair value adjustments (in stockholders' equity) | 1 | 127 | [1]
Expected loss | (1) | (9) |
Fair value | 4,498 | R$ 5,013 |
Financial bills [Member] | Corporate debt securities [member] |  |  |
Disclosure of fair value of investments in equity instruments designated at fair value through other comprehensive income [line items] |  |  |
Gross carrying amount | 6 |  |
Fair value | R$ 6 |  |
[1] | Includes the effects of the allocation of the surplus from the pension fund of Itaubanco Defined Contribution Plan.

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