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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

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