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Financial risk management - Maturity analysis for derivatives parenthetical (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Carrying value |  |
Statements [Line Items] |  |
Demand Deposit Account Less Than 1 Month | ₩ 172,840,771 | ₩ 160,031,760

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- Definition Demand deposit account Less than 1 month. + 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
Name: | shg_StatementsLineItems
Namespace Prefix: | shg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_MeasurementAxis=shg_CarryingValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |