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Segment Information - Summary of Result of Non-Current Assets and Main Services and Products by Geographic Region (Detail) - BRL (R$)
R$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of geographical areas [line items]      
Non-current assets R$ 26,885 R$ 26,631  
Income related to financial operations 145,308 131,317 R$ 149,572
Income related to insurance and private pension operations before claim and selling expenses 4,553 3,961 4,699
Banking service fees 39,032 36,809 34,448
Brazil [Member]      
Disclosure of geographical areas [line items]      
Non-current assets 16,123 15,435  
Income related to financial operations 117,541 108,362 131,689
Income related to insurance and private pension operations before claim and selling expenses 4,423 3,812 4,551
Banking service fees 35,283 33,211 31,296
Abroad [Member]      
Disclosure of geographical areas [line items]      
Non-current assets 10,762 11,196  
Income related to financial operations 27,767 22,955 17,883
Income related to insurance and private pension operations before claim and selling expenses 130 149 148
Banking service fees R$ 3,749 R$ 3,598 R$ 3,152