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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of geographical areas [line items]      
Non-current assets R$ 26,631 R$ 26,742 R$ 25,098
Income related to financial operations 131,317 149,572 174,984
Income related to insurance and private pension operations before claim and selling expenses 3,961 4,699 5,265
Banking service fees 36,809 34,448 31,918
Brazil [Member]      
Disclosure of geographical areas [line items]      
Non-current assets 22,991 23,411 22,974
Income related to financial operations 108,362 131,689 155,030
Income related to insurance and private pension operations before claim and selling expenses 3,812 4,551 5,133
Banking service fees 33,211 31,296 29,061
Abroad [Member]      
Disclosure of geographical areas [line items]      
Non-current assets 3,640 3,331 2,124
Income related to financial operations 22,955 17,883 19,954
Income related to insurance and private pension operations before claim and selling expenses 149 148 132
Banking service fees R$ 3,598 R$ 3,152 R$ 2,857