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Risk and Capital Management - Summary of Off Balance Sheet (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of contractual maturities of assets and liabilities and off balance sheet commitments [line items]    
Financial guarantees R$ 66,720 R$ 66,105
Commitments to be released 305,422 272,843
Letters of credit to be released 15,013 10,747
Contractual commitments-Fixed assets and Intangible 273 678
Total 387,428 350,373
0-30 days [Member]    
Disclosure of contractual maturities of assets and liabilities and off balance sheet commitments [line items]    
Financial guarantees 1,286 1,305
Commitments to be released 125,664 110,909
Letters of credit to be released 15,013 10,747
Contractual commitments-Fixed assets and Intangible 0  
Total 141,963 122,961
31 - 365 days [Member]    
Disclosure of contractual maturities of assets and liabilities and off balance sheet commitments [line items]    
Financial guarantees 19,447 17,314
Commitments to be released 22,818 25,977
Letters of credit to be released 0  
Contractual commitments-Fixed assets and Intangible 273 405
Total 42,538 43,696
366 - 720 days [Member]    
Disclosure of contractual maturities of assets and liabilities and off balance sheet commitments [line items]    
Financial guarantees 9,359 5,509
Commitments to be released 7,064 5,796
Letters of credit to be released 0  
Contractual commitments-Fixed assets and Intangible 0 273
Total 16,423 11,578
Over 720 days [Member]    
Disclosure of contractual maturities of assets and liabilities and off balance sheet commitments [line items]    
Financial guarantees 36,628 41,977
Commitments to be released 149,876 130,161
Letters of credit to be released 0  
Contractual commitments-Fixed assets and Intangible 0  
Total R$ 186,504 R$ 172,138