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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