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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

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No definition available.

+ Details

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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
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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: