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Deposits - Summary of Breakdown of Deposits (Detail) - BRL (R$)
R$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of deposits [Line Items]    
Current R$ 334,197 R$ 307,832
Non-current 172,863 155,592
Total 507,060 463,424
Interest-bearing deposits [Member]    
Disclosure of deposits [Line Items]    
Current 251,882 235,248
Non-current 172,863 155,592
Total 424,745 390,840
Time deposits [Member]    
Disclosure of deposits [Line Items]    
Current 104,458 95,914
Non-current 172,708 155,386
Total 277,166 251,300
Interbank [member]    
Disclosure of deposits [Line Items]    
Current 2,866 2,469
Non-current 155 206
Total 3,021 2,675
Savings deposits [member]    
Disclosure of deposits [Line Items]    
Current 144,558 136,865
Total 144,558 136,865
Non-interest bearing deposits [Member]    
Disclosure of deposits [Line Items]    
Current 82,315 72,584
Total 82,315 72,584
Demand deposits [Member]    
Disclosure of deposits [Line Items]    
Current 82,306 72,581
Total 82,306 72,581
Other [Member]    
Disclosure of deposits [Line Items]    
Current 9 3
Total R$ 9 R$ 3