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Loans at amortized cost, etc. - Changes in deferred loan origination costs and fees (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Changes in deferred loan origination costs [Abstract] |  |
Beginning balance | ₩ 645,569 | ₩ 505,986
Loan origination | 306,840 | 344,963
Amortization, etc. | (224,660) | (205,380)
Ending balance | ₩ 727,749 | ₩ 645,569

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- Definition Amortization of deferred origination loan fees net. + References No definition available. + Details
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Namespace Prefix: | shg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | shg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | shg_LoansAtAmortizedCostDeferredLoanOriginationCostsAndFees
Namespace Prefix: | shg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | shg_LoansAtAmortizedCostDeferredLoanOriginationCostsAndFeesAbstract
Namespace Prefix: | shg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration