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Financial Assets at Fair Value Through Other Comprehensive Income - Securities (Tables) | 12 Months Ended
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Dec. 31, 2019
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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:
|  | 12/31/2019 |  |  | 12/31/2018 |
| Gross carrying amount |  |  | Fair value adjustments (in stockholders’ equity) |  |  | Expected loss |  |  | Fair value |  |  | Gross carrying amount |  |  | Fair value adjustments (in stockholders’ equity) |  |  | Expected loss |  |  | Fair value |
Brazilian government securities (1a) |  |  | 48,718 |  |  |  | 2,014 |  |  |  | — |  |  |  | 50,732 |  |  |  | 27,064 |  |  |  | 775 |  |  |  | — |  |  |  | 27,839 |
Other government securities |  |  | 36 |  |  |  | — |  |  |  | (36 | ) |  |  | — |  |  |  | 36 |  |  |  | — |  |  |  | (36 | ) |  |  | — |
Government securities – abroad (1b) |  |  | 20,638 |  |  |  | (64 | ) |  |  | (3 | ) |  |  | 20,571 |  |  |  | 18,844 |  |  |  | (70 | ) |  |  | (2 | ) |  |  | 18,772 |
Germany |  |  | 23 |  |  |  | — |  |  |  | — |  |  |  | 23 |  |  |  | 22 |  |  |  | — |  |  |  | — |  |  |  | 22 |
Colombia |  |  | 3,851 |  |  |  | 27 |  |  |  | — |  |  |  | 3,878 |  |  |  | 5,491 |  |  |  | 14 |  |  |  | — |  |  |  | 5,505 |
Chile |  |  | 11,119 |  |  |  | 89 |  |  |  | — |  |  |  | 11,208 |  |  |  | 7,647 |  |  |  | 7 |  |  |  | (1 | ) |  |  | 7,653 |
United States |  |  | 2,758 |  |  |  | (2 | ) |  |  | — |  |  |  | 2,756 |  |  |  | 2,634 |  |  |  | (16 | ) |  |  | — |  |  |  | 2,618 |
France |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 891 |  |  |  | — |  |  |  | — |  |  |  | 891 |
Italy |  |  | 328 |  |  |  | 1 |  |  |  | — |  |  |  | 329 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Paraguay |  |  | 1,957 |  |  |  | (174 | ) |  |  | (3 | ) |  |  | 1,780 |  |  |  | 1,601 |  |  |  | (71 | ) |  |  | (1 | ) |  |  | 1,529 |
Uruguay |  |  | 602 |  |  |  | (5 | ) |  |  | — |  |  |  | 597 |  |  |  | 557 |  |  |  | (4 | ) |  |  | — |  |  |  | 553 |
Other |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | 1 |
Corporate debt securities (1c) |  |  | 5,308 |  |  |  | 96 |  |  |  | (47 | ) |  |  | 5,357 |  |  |  | 2,719 |  |  |  | 40 |  |  |  | (47 | ) |  |  | 2,712 |
Negotiable Shares |  |  | 83 |  |  |  | 66 |  |  |  | — |  |  |  | 149 |  |  |  | 77 |  |  |  | 84 |  |  |  | — |  |  |  | 161 |
Bank deposit certificates |  |  | 2,371 |  |  |  | — |  |  |  | — |  |  |  | 2,371 |  |  |  | 1,053 |  |  |  | — |  |  |  | — |  |  |  | 1,053 |
Securitized real estate loans |  |  | 25 |  |  |  | 1 |  |  |  | — |  |  |  | 26 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Debentures |  |  | 387 |  |  |  | (10 | ) |  |  | (43 | ) |  |  | 334 |  |  |  | 44 |  |  |  | — |  |  |  | (42 | ) |  |  | 2 |
Eurobonds and others |  |  | 2,439 |  |  |  | 39 |  |  |  | (1 | ) |  |  | 2,477 |  |  |  | 1,542 |  |  |  | (44 | ) |  |  | (2 | ) |  |  | 1,496 |
Other |  |  | 3 |  |  |  | — |  |  |  | (3 | ) |  |  | — |  |  |  | 3 |  |  |  | — |  |  |  | (3 | ) |  |  | — |
Total |  |  | 74,700 |  |  |  | 2,046 |  |  |  | (86 | ) |  |  | 76,660 |  |  |  | 48,663 |  |  |  | 745 |  |  |  | (85 | ) |  |  | 49,323 |
(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$ 27,864 (R$ 25,147 at 12/31/2018), b) R$ 590 (R$ 3,583 at 12/31/2018) and c) with no amount as of that date (R$ 237 at 12/31/2018), totaling R$ 28,454 (R$ 28,967 at 12/31/2018).
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:
|  | 12/31/2019 |  |  | 12/31/2018 |
| Gross carrying amount |  |  | Fair value |  |  | Gross carrying amount |  |  | Fair value |
Current |  |  | 10,258 |  |  |  | 10,272 |  |  |  | 10,666 |  |  |  | 10,684 |
Non-stated maturity |  |  | 83 |  |  |  | 149 |  |  |  | 77 |  |  |  | 161 |
Up to one year |  |  | 10,175 |  |  |  | 10,123 |  |  |  | 10,589 |  |  |  | 10,523 |
Non-current |  |  | 64,442 |  |  |  | 66,388 |  |  |  | 37,997 |  |  |  | 38,639 |
From one to five years |  |  | 45,704 |  |  |  | 46,456 |  |  |  | 21,417 |  |  |  | 21,650 |
From five to ten years |  |  | 11,101 |  |  |  | 11,649 |  |  |  | 11,906 |  |  |  | 12,029 |
After ten years |  |  | 7,637 |  |  |  | 8,283 |  |  |  | 4,674 |  |  |  | 4,960 |
Total |  |  | 74,700 |  |  |  | 76,660 |  |  |  | 48,663 |  |  |  | 49,323 |
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:
|  | 12/31/2019 |
|  | Gross carrying amount |  |  | Adjustments to fair value (in Stockholders’ equity) |  |  | Expected loss |  |  | Fair Value |
Negotiable shares |  |  | 83 |  |  |  | 66 |  |  |  | — |  |  |  | 149 |
Total |  |  | 83 |  |  |  | 66 |  |  |  | — |  |  |  | 149 |
|  | 12/31/2018 |
|  | Gross carrying amount |  |  | Adjustments to fair value (in Stockholders’ equity) |  |  | Expected loss |  |  | Fair Value |
Negotiable shares |  |  | 77 |  |  |  | 84 |  |  |  | — |  |  |  | 161 |
Total |  |  | 77 |  |  |  | 84 |  |  |  | — |  |  |  | 161 |
ITAÚ UNIBANCO HOLDING adopted the option of designating equity instruments at fair value through other comprehensive income due to the particularities of a certain market.
|  | 12/31/2019 |  |  | 12/31/2018 |
|  | Gross carrying amount |  |  | Fair Value |  |  | Gross carrying amount |  |  | Fair Value |
Current |  |  | 83 |  |  |  | 149 |  |  |  | 77 |  |  |  | 161 |
Non-stated maturity |  |  | 83 |  |  |  | 149 |  |  |  | 77 |  |  |  | 161 |
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 12/31/2018 |  |  | Gains / (Losses) |  |  | Purchases |  |  | Settlements |  |  | Transfer to stage 2 |  |  | Transfer to stage 3 |  |  | Expected loss 12/31/2019 |
Financial assets at fair value through other comprehensive income |  |  | (85 | ) |  |  |  |  |  |  | (1 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (86 | )
Government securities - abroad |  |  | — |  |  |  | (2 | ) |  |  | (1 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3 | )
Brazilian government securities |  |  | (36 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (36 | )
Other |  |  | (36 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (36 | )
Corporate debt securities |  |  | (49 | ) |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (47 | )
Debentures |  |  | (43 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (43 | )
Eurobonds and others |  |  | (3 | ) |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1 | )
Other |  |  | (3 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3 | )
Stage 1 |  | Expected loss 12/31/2017 |  |  | Gains / (Losses) |  |  | Purchases |  |  | Settlements |  |  | Transfer to stage 2 |  |  | Transfer to stage 3 |  |  | Expected loss 12/31/2018 |
Financial assets at fair value through other comprehensive income |  |  | (84 | ) |  |  | (1 | ) |  |  | (2 | ) |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | (85 | )
Brazilian government securities |  |  | (36 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (36 | )
Other |  |  | (36 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (36 | )
Corporate debt securities |  |  | (48 | ) |  |  | (1 | ) |  |  | (2 | ) |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | (49 | )
Debentures |  |  | (43 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (43 | )
Eurobond and others |  |  | (2 | ) |  |  | (1 | ) |  |  | (2 | ) |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | (3 | )
Other |  |  | (3 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3 | )

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