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Other assets - Summary of other assets (Details) - BRL (R$) R$ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Other Assets [Line Items] |  |
Pending settlements | R$ 148,995 | R$ 67,926
Advance payment of third-party services | 39,724 | 7,316
Advance payment of administrative expenses | 17,677 | 2,365
Others advances | 1,203 | 688
Mastercard |  |
Other Assets [Line Items] |  |
Pending settlements | 123,527 | 49,399
B3 exchange |  |
Other Assets [Line Items] |  |
Pending settlements | R$ 25,468 | R$ 15,696
Inter Seguros |  |
Other Assets [Line Items] |  |
Ownership interest of subsidiary sold | 40.00% |
Cash consideration for sale of interest | R$ 45,000 |

X
- Definition Represents the amount of advance payment of administrative expenses. + References No definition available. + Details
Name: | b3_AdvancePaymentOfAdministrativeExpenses
Namespace Prefix: | b3_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount of advance payment of third-party services. + References No definition available. + Details
Name: | b3_AdvancePaymentOfThirdPartyServices
Namespace Prefix: | b3_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount of cash consideration for sale of interest + References No definition available. + Details
Name: | b3_CashConsiderationForSaleOfOwnershipInterestInSubsidiary
Namespace Prefix: | b3_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The table relating to information on other assets. + References No definition available. + Details
Name: | b3_OtherAssetsLineItems
Namespace Prefix: | b3_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of others advances. + References No definition available. + Details
Name: | b3_OthersAdvances
Namespace Prefix: | b3_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the ownership interest of subsidiary sold. + References No definition available. + Details
Name: | b3_OwnershipInterestOfSubsidiarySold
Namespace Prefix: | b3_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of pending settlements as of balance sheet date. + References No definition available. + Details
Name: | b3_PendingSettlements
Namespace Prefix: | b3_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_CounterpartiesAxis=b3_MastercardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=b3_B3ExchangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=b3_InterSegurosMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |