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Risk and Capital Management - Summary of Exposure Weighted by Credit Risk Amount and Ratio Required and Current (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of credit risk exposure [line items]    
Common Equity Tier I, Required R$ 40,108 R$ 36,813
Tier I (Common Equity Tier I + Additional Tier I Capital), Required 53,478 49,084
Tier II, Required 0  
Referential Equity (Tier I + Tier II), Required 71,304 70,559
Common Equity Tier I 117,328 123,358
Additional Tier I Capital 11,368 7,796
Tier I (Common Equity Tier I + Additional Tier I Capital) 128,696 131,154
Tier II 11,900 15,874
Referential Equity (Tier I + Tier II) R$ 140,596 R$ 147,028
Common Equity Tier I 4.50% 4.50%
Tier I (Common Equity Tier I + Additional Tier I Capital) 6.00% 6.00%
Referential Equity (Tier I + Tier II) 8.00% 8.625%
Amount Required for Additional Capital Buffers (ACP) R$ 31,195 R$ 19,429
Additional Capital Buffers (ACP) 3.50% 2.375%
Required ratio [Member]    
Disclosure of credit risk exposure [line items]    
Additional Tier I Capital, Required R$ 0  
Common Equity Tier I 4.50% 4.50%
Additional Tier I Capital 0.00%  
Tier I (Common Equity Tier I + Additional Tier I Capital) 6.00% 6.00%
Tier II 0.00%  
Referential Equity (Tier I + Tier II) 8.00% 8.625%
Current ratio [Member]    
Disclosure of credit risk exposure [line items]    
Common Equity Tier I 13.20% 15.10%
Additional Tier I Capital 0.00%  
Tier I (Common Equity Tier I + Additional Tier I Capital) 14.40% 16.00%
Tier II 0.00%  
Referential Equity (Tier I + Tier II) 15.80% 18.00%