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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