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Earnings per share | 12 Months Ended
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Dec. 31, 2019
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Earnings per share | Note 25 – Earnings per share a) Basic earning 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 |
Potential anti-dilution effects of shares under our share-based payment, excluded from the calculation of diluted earnings per share, totaled 538,312 preferred shares at 12/31/2017. In the years 2019 and 2018 there was no such effect.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2019-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&doctype=Standard&dita_xref=IAS33_g70-73A_TI -URIDate 2019-03-27 + Details
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