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Assets Pledged as Collateral and Assets Held as Collateral - The fair value of collateral held that the Group has the right to sell or repledge regardless of pledger's default (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Fair value of collateral held that the Group has the right to sell or repledge regardless of pledger's default [Abstract] |  |
Assets held as collateral permitted to be sold or repledged at fair value | ₩ 3,607,427 | ₩ 5,676,715
Assets sold or repledged as collateral at fair value | ₩ 1,606,806 | ₩ 1,339,757

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- Definition The fair value of collateral held that is permitted to be sold or repledged in the absence of default by the owner of the collateral. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 15 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_15_a&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 The fair value of collateral sold or repledged that was permitted to be sold or repledged in the absence of default by the owner of the collateral. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 15 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_15_b&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_AssetsSoldOrRepledgedAsCollateralAtFairValue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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