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Earnings per share (Tables) | 12 Months Ended
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Dec. 31, 2019
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Summary of Earnings Per Share | Net income attributable to ITAÚ UNIBANCO HOLDING’s shareholders is divided by the average number of outstanding shares in the period, excluding treasury shares.
|  | 01/01 to 12/31/2019 |  |  | 01/01 to 12/31/2018 |  |  | 01/01 to 12/31/2017 |
Net income attributable to owners of the parent company |  |  | 27,113 |  |  |  | 24,907 |  |  |  | 23,193 |
Minimum non-cumulative dividends on preferred shares |  |  | (105 | ) |  |  | (104 | ) |  |  | (105 | )
Retained earnings to be distributed to common equity owners in an amount per share equal to the minimum dividend payable to preferred equity owners |  |  | (109 | ) |  |  | (109 | ) |  |  | (110 | )
Retained earnings to be distributed, on a pro-rata basis, to common and preferred equity owners: |  |  |  |  |  |  |  |  |  |  |  |
Common |  |  | 13,693 |  |  |  | 12,599 |  |  |  | 11,828 |
Preferred |  |  | 13,206 |  |  |  | 12,095 |  |  |  | 11,150 |
Total net income available to equity owners: |  |  |  |  |  |  |  |  |  |  |  |
Common |  |  | 13,802 |  |  |  | 12,708 |  |  |  | 11,938 |
Preferred |  |  | 13,311 |  |  |  | 12,199 |  |  |  | 11,255 |
Weighted average number of shares outstanding |  |  |  |  |  |  |  |  |  |  |  |
Common |  |  | 4,958,290,359 |  |  |  | 4,958,290,359 |  |  |  | 5,021,834,934 |
Preferred |  |  | 4,781,855,588 |  |  |  | 4,759,872,085 |  |  |  | 4,734,030,111 |
Earnings per share – Basic – R$ |  |  |  |  |  |  |  |  |  |  |  |
Common |  |  | 2.78 |  |  |  | 2.56 |  |  |  | 2.38 |
Preferred |  |  | 2.78 |  |  |  | 2.56 |  |  |  | 2.38 |
b) Diluted earnings per share Calculated similarly to the basic earnings per share; however, it includes the conversion of all preferred shares potentially dilutable in the denominator.
|  | 01/01 to 12/31/2019 |  |  | 01/01 to 12/31/2018 |  |  | 01/01 to 12/31/2017 |
Net income available to preferred equity owners |  |  | 13,311 |  |  |  | 12,199 |  |  |  | 11,255 |
Dividends on preferred shares after dilution effects |  |  | 64 |  |  |  | 72 |  |  |  | 76 |
Net income available to preferred equity owners considering preferred shares after the dilution effect |  |  | 13,375 |  |  |  | 12,271 |  |  |  | 11,331 |
Net income available to ordinary equity owners |  |  | 13,802 |  |  |  | 12,708 |  |  |  | 11,938 |
Dividend on preferred shares after dilution effects |  |  | (64 | ) |  |  | (72 | ) |  |  | (76 | )
Net income available to ordinary equity owners considering preferred shares after the dilution effect |  |  | 13,738 |  |  |  | 12,636 |  |  |  | 11,862 |
Adjusted weighted average of shares |  |  |  |  |  |  |  |  |  |  |  |
Common |  |  | 4,958,290,359 |  |  |  | 4,958,290,359 |  |  |  | 5,021,834,934 |
Preferred |  |  | 4,826,925,107 |  |  |  | 4,815,473,777 |  |  |  | 4,796,645,028 |
Preferred |  |  | 4,781,855,588 |  |  |  | 4,759,872,085 |  |  |  | 4,734,030,111 |
Incremental as per share-based payment plans |  |  | 45,069,519 |  |  |  | 55,601,692 |  |  |  | 62,614,917 |
Diluted earnings per share – R$ |  |  |  |  |  |  |  |  |  |  |  |
Common |  |  | 2.77 |  |  |  | 2.55 |  |  |  | 2.36 |
Preferred |  |  | 2.77 |  |  |  | 2.55 |  |  |  | 2.36 |

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