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Financial Assets at Fair Value Through Other Comprehensive Income - Securities (Tables) | 12 Months Ended
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Dec. 31, 2021
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Summary of Fair Value and Corresponding Gross Carrying Amount of Financial Assets at Fair Value Through Other Comprehensive Income-Securities Assets | The fair value and corresponding gross carrying amount of Financial Assets at Fair Value Through Other Comprehensive Income - Securities assets are as follows:
|  | 12/31/2021 |  |  | 12/31/2020 |
|  | Gross carrying amount |  |  | Fair value adjustments (in stockholders’ equity) |  |  | Expected loss |  |  | Fair value |  |  | Gross carrying amount |  |  | Fair value adjustments (in stockholders’ equity) (2) |  |  | Expected loss |  |  | Fair value |
Brazilian government securities (1a) |  |  | 71,298 |  |  |  | (1,656 | ) |  |  | — |  |  |  | 69,642 |  |  |  | 65,235 |  |  |  | 2,714 |  |  |  | — |  |  |  | 67,949 |
Other government securities |  |  | 36 |  |  |  | — |  |  |  | (36 | ) |  |  | — |  |  |  | 36 |  |  |  | — |  |  |  | (36 | ) |  |  | — |
Government securities – abroad (1b) |  |  | 30,507 |  |  |  | (313 | ) |  |  | — |  |  |  | 30,194 |  |  |  | 34,365 |  |  |  | 38 |  |  |  | (1 | ) |  |  | 34,402 |
Argentina |  |  | 409 |  |  |  | (4 | ) |  |  | — |  |  |  | 405 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Colombia |  |  | 1,942 |  |  |  | (95 | ) |  |  | — |  |  |  | 1,847 |  |  |  | 3,913 |  |  |  | 73 |  |  |  | — |  |  |  | 3,986 |
Chile |  |  | 19,885 |  |  |  | (151 | ) |  |  | — |  |  |  | 19,734 |  |  |  | 21,639 |  |  |  | 12 |  |  |  | — |  |  |  | 21,651 |
United States |  |  | 4,520 |  |  |  | (2 | ) |  |  | — |  |  |  | 4,518 |  |  |  | 3,751 |  |  |  | (1 | ) |  |  | — |  |  |  | 3,750 |
Mexico |  |  | 1,028 |  |  |  | (6 | ) |  |  | — |  |  |  | 1,022 |  |  |  | 1,180 |  |  |  | 1 |  |  |  | — |  |  |  | 1,181 |
Paraguay |  |  | 1,516 |  |  |  | (57 | ) |  |  | — |  |  |  | 1,459 |  |  |  | 3,008 |  |  |  | (60 | ) |  |  | (1 | ) |  |  | 2,947 |
Uruguay |  |  | 1,207 |  |  |  | 2 |  |  |  | — |  |  |  | 1,209 |  |  |  | 874 |  |  |  | 13 |  |  |  | — |  |  |  | 887 |
Corporate securities (1c) |  |  | 6,714 |  |  |  | (880 | ) |  |  | (48 | ) |  |  | 5,786 |  |  |  | 7,799 |  |  |  | (152 | ) |  |  | (56 | ) |  |  | 7,591 |
Shares |  |  | 1,629 |  |  |  | (886 | ) |  |  | — |  |  |  | 743 |  |  |  | 1,640 |  |  |  | (258 | ) |  |  | — |  |  |  | 1,382 |
Bank deposit certificates |  |  | 132 |  |  |  | (1 | ) |  |  | — |  |  |  | 131 |  |  |  | 305 |  |  |  | 2 |  |  |  | — |  |  |  | 307 |
Debentures |  |  | 392 |  |  |  | 3 |  |  |  | (44 | ) |  |  | 351 |  |  |  | 956 |  |  |  | (23 | ) |  |  | (44 | ) |  |  | 889 |
Eurobonds and other |  |  | 4,498 |  |  |  | 1 |  |  |  | (1 | ) |  |  | 4,498 |  |  |  | 4,895 |  |  |  | 127 |  |  |  | (9 | ) |  |  | 5,013 |
Financial bills |  |  | 6 |  |  |  | — |  |  |  | — |  |  |  | 6 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Other |  |  | 57 |  |  |  | 3 |  |  |  | (3 | ) |  |  | 57 |  |  |  | 3 |  |  |  | — |  |  |  | (3 | ) |  |  | — |
Total |  |  | 108,555 |  |  |  | (2,849 | ) |  |  | (84 | ) |  |  | 105,622 |  |  |  | 107,435 |  |  |  | 2,600 |  |  |  | (93 | ) |  |  | 109,942 |
(1) | Financial assets at fair value through other comprehensive income - Securities pledged in guarantee of funding transactions of financial institutions and customers were: a) R$ 43,500 (R$ 35,203 at 12/31/2020), b) R$ 2,385 (R$ 2,398 at 12/31/2020) and c) R$ 778 (R$ 518 at 12/31/2020), totaling R$ 40,723 (R$ 38,119 at 12/31/2020).
(2) | 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).
Summary of Gross Carrying Amount and Fair Value of Financial Assets Through Other Comprehensive Income-Securities by Maturity | The gross carrying amount and the fair value of financial assets through other comprehensive income - securities by maturity are as follows:
|  | 12/31/2021 |  |  | 12/31/2020 |
|  | Gross carrying amount |  |  | Fair value |  |  | Gross carrying amount |  |  | Fair value |
Current |  |  | 27,398 |  |  |  | 26,428 |  |  |  | 33,094 |  |  |  | 32,872 |
Non-stated maturity |  |  | 1,629 |  |  |  | 743 |  |  |  | 1,640 |  |  |  | 1,382 |
Up to one year |  |  | 25,769 |  |  |  | 25,685 |  |  |  | 31,454 |  |  |  | 31,490 |
Non-current |  |  | 81,157 |  |  |  | 79,194 |  |  |  | 74,341 |  |  |  | 77,070 |
From one to five years |  |  | 64,034 |  |  |  | 63,256 |  |  |  | 52,825 |  |  |  | 54,452 |
From five to ten years |  |  | 12,017 |  |  |  | 11,557 |  |  |  | 14,084 |  |  |  | 14,852 |
After ten years |  |  | 5,106 |  |  |  | 4,381 |  |  |  | 7,432 |  |  |  | 7,766 |
Total |  |  | 108,555 |  |  |  | 105,622 |  |  |  | 107,435 |  |  |  | 109,942 |
Summary of Equity Instruments at Fair Value Through Other Comprehensive Income-Securities | Equity instruments at fair value through other comprehensive income - securities are presented in the table below:
|  | 12/31/2021 |
|  | Gross carrying amount |  |  | Adjustments to fair value (in Stockholders’ equity) |  |  | Expected loss |  |  | Fair Value |
Shares |  |  | 1,629 |  |  |  | (886 | ) |  |  | — |  |  |  | 743 |
Total |  |  | 1,629 |  |  |  | (886 | ) |  |  | — |  |  |  | 743 |
|  | 12/31/2020 |
|  | Gross carrying amount |  |  | Adjustments to fair value (in Stockholders’ equity) |  |  | Expected loss |  |  | Fair Value |
Shares |  |  | 1,640 |  |  |  | (258 | ) |  |  | — |  |  |  | 1,382 |
Total |  |  | 1,640 |  |  |  | (258 | ) |  |  | — |  |  |  | 1,382 |
|  | 12/31/2021 |  |  | 12/31/2020 |
|  | Gross carrying amount |  |  | Fair Value |  |  | Gross carrying amount |  |  | Fair Value |
Current |  |  | 1,629 |  |  |  | 743 |  |  |  | 1,640 |  |  |  | 1,382 |
Non-stated maturity |  |  | 1,629 |  |  |  | 743 |  |  |  | 1,640 |  |  |  | 1,382 |
Summary of Reconciliation of Expected Loss for Financial Assets at Fair Value Through Other Comprehensive Instrument-Securities, Segregated by Stages | Reconciliation of expected loss for Other financial assets, segregated by stages:
Stage 1 |  | Expected loss 12/31/2020 |  |  | Gains / (Losses) |  |  | Purchases |  |  | Settlements |  |  | Transfer to stage 2 |  |  | Transfer to stage 3 |  |  | Cure from stage 2 |  |  | Cure from stage 3 |  |  | Expected loss 12/31/2021 |
Financial assets at fair value through other comprehensive income |  |  | (93 | ) |  |  | 3 |  |  |  | (2 | ) |  |  | 8 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (84 | )
Brazilian government securities |  |  | (36 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (36 | )
Other |  |  | (36 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (36 | )
Government securities - abroad |  |  | (1 | ) |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Corporate securities |  |  | (56 | ) |  |  | 2 |  |  |  | (2 | ) |  |  | 8 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (48 | )
Debentures |  |  | (44 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (44 | )
Eurobonds and other |  |  | (9 | ) |  |  | 2 |  |  |  | (2 | ) |  |  | 8 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1 | )
Other |  |  | (3 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3 | )
Stage 1 |  | Expected loss 12/31/2019 |  |  | Gains / (Losses) |  |  | Purchases |  |  | Settlements |  |  | Transfer to stage 2 |  |  | Transfer to stage 3 |  |  | Cure from stage 2 |  |  | Cure from stage 3 |  |  | Expected loss 12/31/2020 |
Financial assets at fair value through other comprehensive income |  |  | (86 | ) |  |  | (8 | ) |  |  | (17 | ) |  |  | 18 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (93 | )
Brazilian government securities |  |  | (36 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (36 | )
Other |  |  | (36 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (36 | )
Government securities - abroad |  |  | (3 | ) |  |  | 2 |  |  |  | (1 | ) |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1 | )
Corporate securities |  |  | (47 | ) |  |  | (10 | ) |  |  | (16 | ) |  |  | 17 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (56 | )
Debentures |  |  | (43 | ) |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (44 | )
Eurobonds and other |  |  | (1 | ) |  |  | (10 | ) |  |  | (15 | ) |  |  | 17 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (9 | )
Other |  |  | (3 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3 | )

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