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Related Parties - Summary of Transactions Between Related Parties (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Loan Operations [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | R$ 144 | R$ 96 |
Revenue / (expenses) | R$ 187 | 6 |
Loan Operations [Member] | Alpargatas SA [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | 2.5% to 6% / SELIC + 2.35% / CDI + 3.15% |  |
Assets / (liabilities) | R$ 49 | 96 |
Revenue / (expenses) | R$ 3 | 6 |
Loan Operations [Member] | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | 113% of CDI |  |
Assets / (liabilities) | R$ 95 |  |
Revenue / (expenses) | 184 |  |
Derivative financial instruments - assets and liabilities [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue / (expenses) | (138) |  |
Derivative financial instruments - assets and liabilities [Member] | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue / (expenses) | (138) |  |
Deposit [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | (70) |  |
Revenue / (expenses) | R$ (9) |  |
Deposit [member] | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | 75% to 96% of CDI |  |
Assets / (liabilities) | R$ (70) |  |
Revenue / (expenses) | (9) |  |
Securities sold under repurchase agreements [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | (29) | (48) |
Revenue / (expenses) | R$ (3) | (5) | R$ (19)
Securities sold under repurchase agreements [member] | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | 50.01% to 100.15% of CDI |  |
Assets / (liabilities) | R$ (10) | (26) |
Revenue / (expenses) | R$ (2) | (3) | (15)
Securities sold under repurchase agreements [member] | Duratex S.A. [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | 95% to 97.5% of CDI |  |
Assets / (liabilities) | R$ (19) | (22) |
Revenue / (expenses) | (1) | (2) | (4)
Amounts Receivable from payable to related companies banking service fees expenses [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | (92) | (108) |
Revenue / (expenses) | 46 | 39 | 28
Amounts Receivable from payable to related companies banking service fees expenses [Member] | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 9 |  |
Revenue / (expenses) | 20 | 15 | 9
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) | (3) | (2) |
Revenue / (expenses) | (25) | (23) | (25)
Amounts Receivable from payable to related companies banking service fees expenses [Member] | Pension plan - FIU [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | (98) | (106) |
Revenue / (expenses) | 51 | 47 | 44
Rental revenues expenses [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue / (expenses) | (46) | (62) | (59)
Rental revenues expenses [Member] | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue / (expenses) | (3) | (2) | (2)
Rental revenues expenses [Member] | Pension plan - FIU [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue / (expenses) | (36) | (49) | (44)
Rental revenues expenses [Member] | Pension plan - FUNBEP [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue / (expenses) | (7) | (11) | (13)
Sponsorship expenses [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue / (expenses) | (31) | (10) | (6)
Sponsorship expenses [member] | Associacao Cubo Coworking Itau [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue / (expenses) | (31) | (10) | (6)
Donation expenses [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue / (expenses) | (96) | (94) | (88)
Donation expenses [Member] | Instituto Itau Cultural [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue / (expenses) | (95) | (93) | (87)
Donation expenses [Member] | Associacao Itau Viver Mais [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue / (expenses) | R$ (1) | R$ (1) | R$ (1)

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