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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

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