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Related Parties - Summary of Transactions Between Related Parties (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Short-term Interbank investments |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | R$ 1,000 |  |
Revenue / (expenses) | R$ 58 |  |
Short-term Interbank investments | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | 4.4 |  |
Assets / (liabilities) | R$ 1,000 |  |
Revenue / (expenses) | 58 |  |
Loan Operations [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 83 | R$ 144 |
Revenue / (expenses) | R$ 6 | 187 | R$ 6
Loan Operations [Member] | Alpargatas SA [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | 2.35% to 6% / 2% + CDI |  |
Assets / (liabilities) | R$ 30 | 49 |
Revenue / (expenses) | R$ 1 | 3 | 6
Loan Operations [Member] | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | 113% CDI |  |
Assets / (liabilities) | R$ 53 | 95 |
Revenue / (expenses) | 5 | 184 |
Derivative financial instruments - assets and liabilities [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 99 |  |
Revenue / (expenses) | 0 | (138) |
Derivative financial instruments - assets and liabilities [Member] | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 0 |  |
Revenue / (expenses) | 0 | (138) |
Deposits [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 0 | (70) |
Revenue / (expenses) | (1) | (10) | (1)
Deposits [member] | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 0 | (70) |
Revenue / (expenses) | 0 | (9) |
Deposits [member] | Olimpia Promocao e Servicos S.A. [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 0 |  |
Revenue / (expenses) | (1) | (1) | (1)
Deposits received under securities repurchase agreements |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | (374) | (29) |
Revenue / (expenses) | R$ (14) | (2) | (2)
Deposits received under securities repurchase agreements | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | 75% to 96% CDI / 3.75% |  |
Assets / (liabilities) | R$ (331) | (10) |
Revenue / (expenses) | R$ (12) | (1) | (1)
Deposits received under securities repurchase agreements | Duratex S.A. [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | 76% to 97.50% CDI |  |
Assets / (liabilities) | R$ (43) | (19) |
Revenue / (expenses) | (2) | (1) | (1)
Amounts Receivable from payable to related companies banking service fees expenses [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | (151) | (126) |
Revenue / (expenses) | 3 | 50 | 37
Amounts Receivable from payable to related companies banking service fees expenses [Member] | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | (8) | 9 |
Revenue / (expenses) | 12 | 14 | 10
Amounts Receivable from payable to related companies banking service fees expenses [Member] | Olimpia Promocao e Servicos S.A. [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | (5) | (3) |
Revenue / (expenses) | (31) | (25) | (18)
Amounts Receivable from payable to related companies banking service fees expenses [Member] | ConectCar Solucoes de Mobilidade Eletronica S.A [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | (46) | (34) |
Revenue / (expenses) | 7 | 4 | 3
Amounts Receivable from payable to related companies banking service fees expenses [Member] | Itau Unibanco Foundation - Supplementary Pensions [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | (93) | (98) |
Revenue / (expenses) | 43 | 51 | 37
Amounts Receivable from payable to related companies banking service fees expenses [Member] | Itasa Investimentos Ita SA [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 1 |  |
Revenue / (expenses) | (28) | 6 | 5
Rental revenues expenses [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 0 |  |
Revenue / (expenses) | (39) | (46) | (34)
Rental revenues expenses [Member] | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 0 |  |
Revenue / (expenses) | (1) | (3) | (7)
Rental revenues expenses [Member] | Itau Unibanco Foundation - Supplementary Pensions [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 0 |  |
Revenue / (expenses) | (32) | (36) | (27)
Rental revenues expenses [Member] | FUNBEP - Multisponsored Association [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 0 |  |
Revenue / (expenses) | (6) | (7) |
Donation expenses [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 0 |  |
Revenue / (expenses) | (35) | (95) | (93)
Sponsorship expenses [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 29 |  |
Revenue / (expenses) | (15) | (32) | (32)
Sponsorship expenses [member] | Ita Cubo Coworking Association [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 29 |  |
Revenue / (expenses) | (14) | (31) | (31)
Sponsorship expenses [member] | Ita Viver Mais Association [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 0 |  |
Revenue / (expenses) | R$ (1) | R$ (1) | R$ (1)

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