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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, 2018
Dec. 31, 2017
Disclosure of credit risk exposure [line items]    
Common Equity Tier I, Required R$ 36,813 R$ 34,052
Additional Tier I Capital, Required 0 0
Tier I (Common Equity Tier I + Additional Tier I Capital), Required 49,084 45,402
Tier II, Required 0 0
Referential Equity (Tier I + Tier II), Required 70,559 69,995
Common Equity Tier I 123,358 122,396
Additional Tier I Capital 7,796 57
Tier I (Common Equity Tier I + Additional Tier I Capital) 131,154 122,453
Tier II 15,874 19,799
Referential Equity (Tier I + Tier II) R$ 147,028 R$ 142,252
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) 8.625% 9.25%
Amount Required for Additional Common Equity Tier I (ACP) R$ 19,429 R$ 11,351
Additional Common Equity Tier I (ACP) 2.375% 1.50%
Required ratio [Member]    
Disclosure of credit risk exposure [line items]    
Common Equity Tier I 4.50% 4.50%
Additional Tier I Capital 0.00% 0.00%
Tier I (Common Equity Tier I + Additional Tier I Capital) 6.00% 6.00%
Tier II 0.00% 0.00%
Referential Equity (Tier I + Tier II) 8.625% 9.25%
Current ratio [Member]    
Disclosure of credit risk exposure [line items]    
Common Equity Tier I 15.10% 16.20%
Additional Tier I Capital 0.00% 0.00%
Tier I (Common Equity Tier I + Additional Tier I Capital) 16.00% 16.20%
Tier II 0.00% 0.00%
Referential Equity (Tier I + Tier II) 18.00% 18.80%