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Pledged assets, guarantees and commitments - Additional Information (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Disclosure of assets pledged, Guarantees And Commitments [Line Items] |  |
Contingent liabilities and commitments | $ 3,963 | $ 1,655
Commitments for loan funding |  |
Disclosure of assets pledged, Guarantees And Commitments [Line Items] |  |
Contingent liabilities and commitments | $ 3,963 | $ 1,655

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- Definition Contingent Liabilities And Commitments + References No definition available. + Details
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Namespace Prefix: | klar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disclosure of assets pledged, Guarantees And Commitments + References No definition available. + Details
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Namespace Prefix: | klar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=ifrs-full_LoanCommitmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |