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Related Parties - Summary of Transactions Between Related Parties (Detail) - BRL (R$) R$ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Short-term Interbank investments |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | R$ 2,301 | R$ 18,539 |
Revenue / (expenses) | R$ 84 | 63 | R$ 58
Short-term Interbank investments | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | 9.15 |  |
Assets / (liabilities) | R$ 2,301 | 18,539 |
Revenue / (expenses) | 84 | 63 | 58
Loan Operations [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 654 | 727 |
Revenue / (expenses) | R$ 35 | 56 | 6
Loan Operations [Member] | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | 100% CDI /2.5% to 6% |  |
Assets / (liabilities) | R$ 108 | 212 |
Revenue / (expenses) | R$ 4 | 37 | 6
Loan Operations [Member] | Dexco S.A. [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | CDI + 1.45% |  |
Assets / (liabilities) | R$ 546 | 515 |
Revenue / (expenses) | 31 | 19 |
Securities and derivative financial instruments - assets and liabilities [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 5,397 | 1,716 |
Revenue / (expenses) | R$ 303 | 6 |
Securities and derivative financial instruments - assets and liabilities [Member] | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | CDI + 3.5% |  |
Assets / (liabilities) | R$ 514 | (112) |
Revenue / (expenses) | 30 | (10) |
Securities and derivative financial instruments - assets and liabilities [Member] | Investment funds [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 183 | 107 |
Revenue / (expenses) | R$ 34 | 14 |
Securities and derivative financial instruments - assets and liabilities [Member] | Itaúsa S.A.[member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | CDI + 2% to 2.4% |  |
Assets / (liabilities) | R$ 1,200 | 771 |
Revenue / (expenses) | R$ 74 | 1 |
Securities and derivative financial instruments - assets and liabilities [Member] | Copagaz – Distribuidora de Gás S.A. [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | CDI + 1.7% to 2.95% |  |
Assets / (liabilities) | R$ 1,082 | 950 |
Revenue / (expenses) | R$ 71 | 1 |
Securities and derivative financial instruments - assets and liabilities [Member] | Aguas do Rio 4 SPE S.A. [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | CDI + 3.5% |  |
Assets / (liabilities) | R$ 1,574 |  |
Revenue / (expenses) | R$ 60 |  |
Securities and derivative financial instruments - assets and liabilities [Member] | Aegea Saneamento e Participaes S.A. [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | CDI + 1.5% to 2.9% |  |
Assets / (liabilities) | R$ 844 |  |
Revenue / (expenses) | 34 |  |
Deposits [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue / (expenses) | (2) | (1) | (1)
Deposits [member] | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue / (expenses) | (2) | (1) | (1)
Deposits received under securities repurchase agreements [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | (443) | (165) |
Revenue / (expenses) | R$ (34) | (13) | (14)
Deposits received under securities repurchase agreements [member] | Alpargatas SA [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | 99% to 101% CDI |  |
Assets / (liabilities) | R$ (22) | (107) |
Revenue / (expenses) | R$ (1) | (11) |
Deposits received under securities repurchase agreements [member] | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | 75% to 96% CDI |  |
Assets / (liabilities) | R$ (203) | (9) |
Revenue / (expenses) | R$ (23) |  | (12)
Deposits received under securities repurchase agreements [member] | Dexco S.A. [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | 82% to 99% CDI |  |
Assets / (liabilities) | R$ (15) | (49) |
Revenue / (expenses) | R$ (1) | (2) | (2)
Deposits received under securities repurchase agreements [member] | Aguas do Rio 4 SPE S.A. [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | 99% CDI |  |
Assets / (liabilities) | R$ (32) |  |
Revenue / (expenses) | R$ (3) |  |
Deposits received under securities repurchase agreements [member] | Aegea Saneamento e Participaes S.A. [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | 97% to 99.3% CDI |  |
Assets / (liabilities) | R$ (158) |  |
Revenue / (expenses) | R$ (5) |  |
Deposits received under securities repurchase agreements [member] | Aguas do Rio 1 SPE S.A. [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Annual rate | 99% CDI |  |
Assets / (liabilities) | R$ (13) |  |
Revenue / (expenses) | (1) |  |
Amounts receivable (payable) / Commissions and/or Other General and Administrative expenses [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | (273) | (26) |
Revenue / (expenses) | (122) | 26 | 3
Amounts receivable (payable) / Commissions and/or Other General and Administrative expenses [Member] | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 18 | (1) |
Revenue / (expenses) | 1 |  | 5
Amounts receivable (payable) / Commissions and/or Other General and Administrative expenses [Member] | Olimpia Promocao e Servicos S.A. [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | (5) | (9) |
Revenue / (expenses) |  | (45) | (31)
Amounts receivable (payable) / Commissions and/or Other General and Administrative expenses [Member] | ConectCar Solucoes de Mobilidade Eletronica S.A [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | (8) | (46) |
Revenue / (expenses) | (4) | 7 | 7
Amounts receivable (payable) / Commissions and/or Other General and Administrative expenses [Member] | Instituto Unibanco [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) |  | 123 |
Revenue / (expenses) | 3 | 3 |
Amounts receivable (payable) / Commissions and/or Other General and Administrative expenses [Member] | Fundação Itaú Unibanco – Previdência Complementar [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | (78) | (93) |
Revenue / (expenses) | 37 | 42 | 43
Amounts receivable (payable) / Commissions and/or Other General and Administrative expenses [Member] | Itaúsa S.A.[member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | (10) | 1 |
Revenue / (expenses) | 13 | 12 | (28)
Amounts receivable (payable) / Commissions and/or Other General and Administrative expenses [Member] | FUNBEP – Fundo de Pensão Multipatrocinado [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | (158) | (1) |
Revenue / (expenses) | (172) | 7 | 7
Amounts receivable (payable) / Commissions and/or Other General and Administrative expenses [Member] | Aguas do Rio 4 SPE S.A. [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | (20) |  |
Amounts receivable (payable) / Commissions and/or Other General and Administrative expenses [Member] | Aguas do Rio 1 SPE S.A. [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | (12) |  |
Rent [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue / (expenses) | (37) | (31) | (39)
Rent [Member] | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue / (expenses) |  |  | (1)
Rent [Member] | Fundação Itaú Unibanco – Previdência Complementar [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue / (expenses) | (34) | (28) | (32)
Rent [Member] | FUNBEP – Fundo de Pensão Multipatrocinado [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue / (expenses) | (3) | (3) | (6)
Donation [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) |  | (500) |
Revenue / (expenses) |  | (1,002) | (35)
Donation [Member] | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue / (expenses) |  | (2) |
Donation [Member] | Fundação Itaú para a Educação e Cultura [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) |  | (500) |
Revenue / (expenses) |  | (1,000) | (35)
Sponsorship [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 12 | 12 |
Revenue / (expenses) | (14) | (16) | (15)
Sponsorship [member] | Other [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Revenue / (expenses) |  |  | (1)
Sponsorship [member] | Associação Cubo Coworking Itaú [Member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Assets / (liabilities) | 12 | 12 |
Revenue / (expenses) | R$ (14) | R$ (16) | R$ (14)

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