XML 301 R72.htm IDEA: XBRL DOCUMENT
v3.25.4

Risk management and management of capital - Interest rate exposures explanatory (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
-200 bps parallel shift in interest rates, percent | (2.00%) |  |
200 bps parallel shift in interest rates | 2.00% |  |
Interest rate risk |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
-200 bps parallel shift in interest rates | $ (1) | $ (20) | $ (29)
200 bps parallel shift in interest rates | 1 | 19 | 27
SEK | Interest rate risk |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
-200 bps parallel shift in interest rates | 10 | 4 | 5
200 bps parallel shift in interest rates | (10) | (4) | (5)
EUR | Interest rate risk |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
-200 bps parallel shift in interest rates | (28) | (34) | (43)
200 bps parallel shift in interest rates | 26 | 32 | 41
USD | Interest rate risk |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
-200 bps parallel shift in interest rates | 10 | 3 | 5
200 bps parallel shift in interest rates | (9) | (2) | (5)
GBP | Interest rate risk |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
-200 bps parallel shift in interest rates | 6 | 6 | 4
200 bps parallel shift in interest rates | (6) | (6) | (4)
Other | Interest rate risk |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
-200 bps parallel shift in interest rates | 1 | 1 | 0
200 bps parallel shift in interest rates | $ (1) | $ (1) | $ 0

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable Decrease, Impact On Economic Value of Equity + References No definition available. + Details
Name: | klar_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableDecreaseImpactOnEconomicValueOfEquity
Namespace Prefix: | klar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable Decrease, Percent + References No definition available. + Details
Name: | klar_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableDecreasePercent
Namespace Prefix: | klar_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable Increase, Impact On Economic Value of Equity + References No definition available. + Details
Name: | klar_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableIncreaseImpactOnEconomicValueOfEquity
Namespace Prefix: | klar_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable Increase, Percent + References No definition available. + Details
Name: | klar_SensitivityAnalysisForTypesOfMarketRiskReasonablyPossibleChangeInRiskVariableIncreasePercent
Namespace Prefix: | klar_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_InterestRateRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_SEK
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_EUR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_USD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_GBP
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=srt_OtherCurrencyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |