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Financial Assets at Fair Value Through Other Comprehensive Income - Securities (Tables) | 12 Months Ended
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Dec. 31, 2018
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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:
|  | 12/31/2018 |  |  | 12/31/2017 |
|  | 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) |  |  | 27,064 |  |  |  | 775 |  |  |  | 0 |  |  |  | 27,839 |  |  |  | 31,933 |  |  |  | 993 |  |  |  | — |  |  |  | 32,926 |
Other |  |  | 36 |  |  |  | 0 |  |  |  | (36 | ) |  |  | 0 |  |  |  | 36 |  |  |  | — |  |  |  | (36 | ) |  |  | — |
Government securities – abroad (1b) |  |  | 18,844 |  |  |  | (70 | ) |  |  | (2 | ) |  |  | 18,772 |  |  |  | 16,583 |  |  |  | (41 | ) |  |  | — |  |  |  | 16,542 |
Germany |  |  | 22 |  |  |  | 0 |  |  |  | 0 |  |  |  | 22 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Colombia |  |  | 5,491 |  |  |  | 14 |  |  |  | 0 |  |  |  | 5,505 |  |  |  | 2,928 |  |  |  | 92 |  |  |  | — |  |  |  | 3,020 |
Chile |  |  | 7,647 |  |  |  | 7 |  |  |  | (1 | ) |  |  | 7,653 |  |  |  | 9,554 |  |  |  | (4 | ) |  |  | — |  |  |  | 9,550 |
United States |  |  | 2,634 |  |  |  | (16 | ) |  |  | 0 |  |  |  | 2,618 |  |  |  | 1,568 |  |  |  | (18 | ) |  |  | — |  |  |  | 1,550 |
France |  |  | 891 |  |  |  | 0 |  |  |  | 0 |  |  |  | 891 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Paraguay |  |  | 1,601 |  |  |  | (71 | ) |  |  | (1 | ) |  |  | 1,529 |  |  |  | 1,915 |  |  |  | (115 | ) |  |  | — |  |  |  | 1,800 |
Uruguay |  |  | 557 |  |  |  | (4 | ) |  |  | 0 |  |  |  | 553 |  |  |  | 618 |  |  |  | 4 |  |  |  | — |  |  |  | 622 |
Other |  |  | 1 |  |  |  | 0 |  |  |  | 0 |  |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Corporate securities (1c) |  |  | 2,719 |  |  |  | 40 |  |  |  | (47 | ) |  |  | 2,712 |  |  |  | 2,656 |  |  |  | 73 |  |  |  | (48 | ) |  |  | 2,681 |
Shares |  |  | 77 |  |  |  | 84 |  |  |  | 0 |  |  |  | 161 |  |  |  | 73 |  |  |  | 75 |  |  |  | — |  |  |  | 148 |
Bank deposit certificates |  |  | 1,053 |  |  |  | 0 |  |  |  | 0 |  |  |  | 1,053 |  |  |  | 685 |  |  |  | — |  |  |  | — |  |  |  | 685 |
Debentures |  |  | 44 |  |  |  | 0 |  |  |  | (42 | ) |  |  | 2 |  |  |  | 44 |  |  |  | — |  |  |  | (43 | ) |  |  | 1 |
Eurobonds and others |  |  | 1,542 |  |  |  | (44 | ) |  |  | (2 | ) |  |  | 1,496 |  |  |  | 1,851 |  |  |  | (2 | ) |  |  | (2 | ) |  |  | 1,847 |
Other |  |  | 3 |  |  |  | 0 |  |  |  | (3 | ) |  |  | 0 |  |  |  | 3 |  |  |  | — |  |  |  | (3 | ) |  |  | — |
Total |  |  | 48,663 |  |  |  | 745 |  |  |  | (85 | ) |  |  | 49,323 |  |  |  | 51,208 |  |  |  | 1,025 |  |  |  | (84 | ) |  |  | 52,149 |
(1) | Financial assets at fair value through other comprehensive income - Securities pledged in guarantee of funding transactions of financial institutions and clients were: a) R$ 25,147 (R$ 26,953 at 12/31/2017), b) R$ 3,583 (R$ 37 at 12/31/2017) and c) R$ 237 (R$ 479 at 12/31/2017), totaling R$ 28,967 (R$ 27,469 at 12/31/2017);
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:
|  | 12/31/2018 |  |  | 12/31/2017 |
|  | Gross carrying amount |  |  | Fair value |  |  | Gross carrying amount |  |  | Fair value |
Current |  |  | 10,666 |  |  |  | 10,684 |  |  |  | 9,546 |  |  |  | 9,666 |
Non-stated maturity |  |  | 77 |  |  |  | 161 |  |  |  | 73 |  |  |  | 148 |
Up to one year |  |  | 10,589 |  |  |  | 10,523 |  |  |  | 9,473 |  |  |  | 9,518 |
Non-current |  |  | 37,997 |  |  |  | 38,639 |  |  |  | 41,662 |  |  |  | 42,483 |
From one to five years |  |  | 21,417 |  |  |  | 21,650 |  |  |  | 23,138 |  |  |  | 23,415 |
From five to ten years |  |  | 11,906 |  |  |  | 12,029 |  |  |  | 11,368 |  |  |  | 11,680 |
After ten years |  |  | 4,674 |  |  |  | 4,960 |  |  |  | 7,156 |  |  |  | 7,388 |
Total |  |  | 48,663 |  |  |  | 49,323 |  |  |  | 51,208 |  |  |  | 52,149 |
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:
|  | 12/31/2018 |
| Gross carrying amount |  |  | Adjustments to fair value (in Stockholders’ equity) |  |  | Expected loss |  |  | Fair Value |
Negotiable shares |  |  | 77 |  |  |  | 84 |  |  |  | 0 |  |  |  | 161 |
Total |  |  | 77 |  |  |  | 84 |  |  |  | 0 |  |  |  | 161 |
|  | 12/31/2017 |
| Gross carrying amount |  |  | Adjustments to fair value (in Stockholders’ equity) |  |  | Expected loss |  |  | Fair Value |
Negotiable shares |  |  | 73 |  |  |  | 75 |  |  |  | — |  |  |  | 148 |
Total |  |  | 73 |  |  |  | 75 |  |  |  | — |  |  |  | 148 |
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.
|  | 12/31/2018 |  |  | 12/31/2017 |
| Gross carrying amount |  |  | Fair Value |  |  | Gross carrying amount |  |  | Fair Value |
Current |  |  | 77 |  |  |  | 161 |  |  |  | 73 |  |  |  | 148 |
Non-stated maturity |  |  | 77 |  |  |  | 161 |  |  |  | 73 |  |  |  | 148 |
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 Financial assets at fair value through other comprehensive instrument - securities, segregated by stages:
Stage 1 |  | Expected loss 01/01/2018 |  |  | Gains / (Losses) |  |  | Purchases |  |  | Settlements |  |  | Expected loss 12/31/2018 |
Financial assets at fair value through other comprehensive income |  |  | (84 | ) |  |  | (1 | ) |  |  | (2 | ) |  |  | 2 |  |  |  | (85 | )
Brazilian government securities |  |  | (36 | ) |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | (36 | )
Other |  |  | (36 | ) |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | (36 | )
Corporate securities |  |  | (48 | ) |  |  | (1 | ) |  |  | (2 | ) |  |  | 2 |  |  |  | (49 | )
Debentures |  |  | (43 | ) |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | (43 | )
Eurobonds and others |  |  | (2 | ) |  |  | (1 | ) |  |  | (2 | ) |  |  | 2 |  |  |  | (3 | )
Other |  |  | (3 | ) |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | (3 | )
Stage 1 |  | Expected loss 01/01/2017 |  |  | Gains / (Losses) |  |  | Purchases |  |  | Settlements |  |  | Transfer to stage 2 |  |  | Transfer to stage 3 |  |  | Expected loss 12/31/2017 |
Financial assets at fair value through other comprehensive income |  |  | (93 | ) |  |  | — |  |  |  | (2 | ) |  |  | — |  |  |  | — |  |  |  | 11 |  |  |  | (84 | )
Brazilian government securities |  |  | (36 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (36 | )
Others |  |  | (36 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (36 | )
Corporate securities |  |  | (57 | ) |  |  | — |  |  |  | (2 | ) |  |  | — |  |  |  | — |  |  |  | 11 |  |  |  | (48 | )
Debentures |  |  | (43 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (43 | )
Eurobond and others |  |  | (11 | ) |  |  | — |  |  |  | (2 | ) |  |  | — |  |  |  | — |  |  |  | 11 |  |  |  | (2 | )
Others |  |  | (3 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3 | )
Stage 3 |  | Expected loss 01/01/2017 |  |  | Gains / (Losses) |  |  | Purchases |  |  | Settlements |  |  | Cure from stage 1 |  |  | Transfer to stage 2 |  |  | Expected loss 12/31/2017 |
Financial assets at fair value through other comprehensive income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 10 |  |  |  | (10 | ) |  |  | — |  |  |  | — |
Corporate securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 10 |  |  |  | (10 | ) |  |  | — |  |  |  | — |
Eurobonds and others |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 10 |  |  |  | (10 | ) |  |  | — |  |  |  | — |
Stage 1 |  | Expected loss 01/01/2016 |  |  | Gains / (Losses) |  |  | Purchases |  |  | Settlements |  |  | Transfer to stage 2 |  |  | Cure from stage 3 |  |  | Expected loss 12/31/2016 |
Financial assets at fair value through other comprehensive income |  |  | (82 | ) |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | — |  |  |  | (10 | ) |  |  | (93 | )
Brazilian government securities |  |  | (36 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (36 | )
Other |  |  | (36 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (36 | )
Corporate securities |  |  | (46 | ) |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | — |  |  |  | (10 | ) |  |  | (57 | )
Debentures |  |  | (43 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (43 | )
Other |  |  | (3 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3 | )
Stage 3 |  | Expected loss 01/01/2016 |  |  | Gains / (Losses) |  |  | Purchases |  |  | Settlements |  |  | Transfer to stage 1 |  |  | Transfer to stage 2 |  |  | Expected loss 12/31/2016 |
Financial assets at fair value through other comprehensive income |  |  | (13 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 13 |  |  |  | — |  |  |  | — |
Corporate securities |  |  | (13 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 13 |  |  |  | — |  |  |  | — |
Eurobonds and others |  |  | (13 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 13 |  |  |  | — |  |  |  | — |

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