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Earnings Per Share - Summary of Earnings Per Share (Detail) - BRL (R$) R$ / shares in Units, R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Earnings per share [line items] |  |  |
Net income | R$ 27,113 | R$ 24,907 | R$ 23,193
Minimum non-cumulative dividends on preferred shares | (105) | (104) | (105)
Total net income available to ordinary equity owners | 27,113 | 24,907 | 23,193
Retained earnings to be distributed to common equity owners in an amount per share equal to the minimum dividend payable to preferred equity owners | R$ (109) | R$ (109) | R$ (110)
Earnings per share - basic vv |  |  |
Preferred | 4,781,855,588 | 4,759,872,085 | 4,734,030,111
Incremental from stock options granted under our share-based payment | 45,069,519 | 55,601,692 | 62,614,917
Ordinary shares [member] |  |  |
Earnings per share [line items] |  |  |
Net income | R$ 13,802 | R$ 12,708 | R$ 11,938
Weighted average number of shares outstanding | 4,958,290,359 | 4,958,290,359 | 5,021,834,934
Total net income available to ordinary equity owners | R$ 13,802 | R$ 12,708 | R$ 11,938
Dividend on preferred shares after dilution effects | (64) | (72) | (76)
Retained earnings to be distributed, on a pro-rata basis, to common and preferred equity owners |  |  |
Retained earnings | 13,693 | 12,599 | 11,828
Net income available to ordinary equity owners considering preferred shares after the dilution effect | R$ 13,738 | R$ 12,636 | R$ 11,862
Earnings per share - basic vv |  |  |
Basic earnings per share | R$ 2.78 | R$ 2.56 | R$ 2.38
Preferred | 4,958,290,359 | 4,958,290,359 | 5,021,834,934
Common | 4,958,290,359 | 4,958,290,359 | 5,021,834,934
Common | R$ 2.77 | R$ 2.55 | R$ 2.36
Preference shares [member] |  |  |
Earnings per share [line items] |  |  |
Net income | R$ 13,311 | R$ 12,199 | R$ 11,255
Weighted average number of shares outstanding | 4,781,855,588 | 4,759,872,085 | 4,734,030,111
Total net income available to ordinary equity owners | R$ 13,311 | R$ 12,199 | R$ 11,255
Dividend on preferred shares after dilution effects | 64 | 72 | 76
Retained earnings to be distributed, on a pro-rata basis, to common and preferred equity owners |  |  |
Retained earnings | 13,206 | 12,095 | 11,150
Net income available to ordinary equity owners considering preferred shares after the dilution effect | R$ 13,375 | R$ 12,271 | R$ 11,331
Earnings per share - basic vv |  |  |
Basic earnings per share | R$ 2.78 | R$ 2.56 | R$ 2.38
Preferred | 4,826,925,107 | 4,815,473,777 | 4,796,645,028
Common | 4,781,855,588 | 4,759,872,085 | 4,734,030,111
Common | R$ 2.77 | R$ 2.55 | R$ 2.36

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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2019-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_66&doctype=Standard -URIDate 2019-03-27 + Details
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