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Commitments and contingencies - Summary of pending litigations (Details) (Parenthetical) - KRW (₩) ₩ in Millions | Feb. 12, 2026 | Feb. 11, 2026 | Feb. 05, 2026 | Dec. 31, 2025 | Feb. 14, 2025
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Loss Claim One [Member] |  |  |  |  |
litigations [Line Items] |  |  |  |  |
Litigation Settlement Payment |  |  |  |  | ₩ 63,200
Loss Claim Two [Member] |  |  |  |  |
litigations [Line Items] |  |  |  |  |
Litigation Settlement Payment |  |  | ₩ 41,500 |  |
Litigation Provision |  |  |  | ₩ 40,100 |
Loss claim regarding responsibility [Member] |  |  |  |  |
litigations [Line Items] |  |  |  |  |
Claim Amount first instance |  |  |  | 169,930 |
Claim Amount second instance |  |  |  | 91,700 |
Other litigations [Member] |  |  |  |  |
litigations [Line Items] |  |  |  |  |
Claim Amount first instance |  | ₩ 7,005 |  |  |
Claim Amount second instance | ₩ 5,000 |  |  |  |
Litigation Provision first instance |  |  |  | 3,694 |
Litigation Provision second instance |  |  |  | ₩ 7,379 |

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- Definition Claim amount first instance + References No definition available. + Details
Name: | shg_ClaimAmountFirstInstance
Namespace Prefix: | shg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Claim Amount second instance + References No definition available. + Details
Name: | shg_ClaimAmountSecondInstance
Namespace Prefix: | shg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Litigation Provision + References No definition available. + Details
Name: | shg_LitigationProvision
Namespace Prefix: | shg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Litigation provision first instance + References No definition available. + Details
Name: | shg_LitigationProvisionFirstInstance
Namespace Prefix: | shg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Litigation provision second instance + References No definition available. + Details
Name: | shg_LitigationProvisionSecondInstance
Namespace Prefix: | shg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

X
- Details
Name: | shg_LitigationsStatusAxis=shg_LossClaimOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | shg_LitigationsStatusAxis=shg_LossClaimTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | shg_LitigationsStatusAxis=shg_LossclaimregardingresponsibilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | shg_LitigationsStatusAxis=shg_OtherLitigationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |