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Financial risk management - Credit risk exposures per credit quality of derivative assets (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Disclosure of Credit quality of derivative assets [Line Items] |  |
Derivative assets | ₩ 7,153,950 | ₩ 10,279,257
Grade 1 |  |
Disclosure of Credit quality of derivative assets [Line Items] |  |
Derivative assets | 6,797,321 | 9,578,458
Grade 2 |  |
Disclosure of Credit quality of derivative assets [Line Items] |  |
Derivative assets | ₩ 356,629 | ₩ 700,799

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- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_InternalCreditGradesAxis=shg_InternalCreditRatingOfBBBPlusOrAboveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_InternalCreditGradesAxis=shg_InternalCreditRatingOfBelowBBBPlusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |