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Income tax expense - Summary of deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences (Parenthetical) (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Changes in deferred tax liability (asset) [abstract] |  |
Decrease in deferred tax assets from overseas subsidiaries | ₩ 1,128 | ₩ 6,721

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

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- Definition Decrease in deferred tax assets from overseas subsidiaries. + References No definition available. + Details
Name: | shg_DecreaseInDeferredTaxAssetsFromOverseasSubsidiaries
Namespace Prefix: | shg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration