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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Earnings per share [line items] |  |  |
Net income | R$ 24,907 | R$ 23,193 | R$ 21,627
Minimum non-cumulativedividend on preferred shares | (104) | (105) | (105)
Total net income available to ordinary equity owners | 24,907 | 23,193 | 21,627
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$ (110) | R$ (111)
Earnings per share - basic vv |  |  |
Incremental from stock options granted under our share-based payment | 55,601,692 | 62,614,917 | 65,040,790
Ordinary shares [member] |  |  |
Earnings per share [line items] |  |  |
Net income | R$ 12,708 | R$ 11,938 | R$ 11,113
Weighted average number of shares outstanding | 4,958,290,359 | 5,021,834,934 | 5,027,611,714
Total net income available to ordinary equity owners | R$ 12,708 | R$ 11,938 | R$ 11,113
Dividend on preferred shares after dilution effects | (72) | (76) | (74)
Retained earnings to be distributed, on a pro-rata basis, to common and preferred equity owners |  |  |
Retained earnings | 12,599 | 11,828 | 11,002
Net income available to ordinary equity owners considering preferred shares after the dilution effect | R$ 12,636 | R$ 11,862 | R$ 11,039
Earnings per share - basic vv |  |  |
Basic earnings per share | R$ 2.56 | R$ 2.38 | R$ 2.21
Preferred | 4,958,290,359 | 5,021,834,934 | 5,027,611,714
Common | 4,958,290,359 | 5,021,834,934 | 5,027,611,714
Common | R$ 2.55 | R$ 2.36 | R$ 2.20
Preference shares [member] |  |  |
Earnings per share [line items] |  |  |
Net income | R$ 12,199 | R$ 11,255 | R$ 10,514
Weighted average number of shares outstanding | 4,759,872,085 | 4,734,030,111 | 4,756,823,490
Total net income available to ordinary equity owners | R$ 12,199 | R$ 11,255 | R$ 10,514
Dividend on preferred shares after dilution effects | 72 | 76 | 74
Retained earnings to be distributed, on a pro-rata basis, to common and preferred equity owners |  |  |
Retained earnings | 12,095 | 11,150 | 10,409
Net income available to ordinary equity owners considering preferred shares after the dilution effect | R$ 12,271 | R$ 11,331 | R$ 10,588
Earnings per share - basic vv |  |  |
Basic earnings per share | R$ 2.56 | R$ 2.38 | R$ 2.21
Preferred | 4,815,473,777 | 4,796,645,028 | 4,821,864,280
Common | 4,759,872,085 | 4,734,030,111 | 4,756,823,490
Common | R$ 2.55 | R$ 2.36 | R$ 2.20

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