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Financial risk management - Additional Information (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Disclosure of financial risk management [Line Items] |  |
Addition of capital conservation capital points | 2.50% |
Addtion of domestic system critical bank capital points | 1.00% |
Addition of economic response capital points | (2.50%) |
Financial assets related securitization transactions neither transferred nor derecognized | ₩ 10,815,348 | ₩ 11,369,662
Financial liabilities related securitization transactions neither transferred nor derecognized | ₩ 6,586,888 | ₩ 7,144,588
Bottom of range [member] |  |
Disclosure of financial risk management [Line Items] |  |
Minimum BIS capital ratio | 12.50% |
Capital conservation capital points | (2.50%) |
Domestic system critical bank capital points | (1.00%) |
Economic resource capital points | (1.00%) |
Top of range [member] |  |
Disclosure of financial risk management [Line Items] |  |
Economic response capital to be charged during credit expansion | 2.50% |
Criteria For Capital Adequacy To Be complied With [Member] |  |
Disclosure of financial risk management [Line Items] |  |
Increase in BIS capital ratio | 14.00% |

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- Definition Addition of capital conservation capital points. + References No definition available. + Details
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- Definition Addition of domestic system critical bank capital points + References No definition available. + Details
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- Definition Addition of economic response capital points. + References No definition available. + Details
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- Definition Capital conservation capital points. + References No definition available. + Details
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- Definition Domestic system critical bank capital points. + References No definition available. + Details
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- Definition Economic resource capital points. + References No definition available. + Details
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- Definition Economic response capital to be charged during credit expansion + References No definition available. + Details
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- Definition Financial assets related securitization transactions neither transferred nor derecognized. + References No definition available. + Details
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- Definition Financial liabilities related securitization transactions neither transferred nor derecognized. + References No definition available. + Details
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- Definition Increase in BIS capital ratio. + References No definition available. + Details
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- Definition Minimum BIS capital ratio. + References No definition available. + Details
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- Details
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