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Provision for credit loss allowance - Summary of provision for allowance for credit loss on financial assets (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Provision for allowance for credit loss [Line Items] |  |  |
Allowance provided for credit loss | ₩ (2,110,087) | ₩ (2,017,585) | ₩ (2,244,639)
Allowance provided (reversed) for credit loss | (2,002,965) | (2,013,274) | (2,244,503)
Allowance Reversed For Credit Loss | 107,122 | 4,311 | 136
Loans at amortized cost net category |  |  |
Provision for allowance for credit loss [Line Items] |  |  |
Allowance provided for credit loss | (2,014,137) | (1,862,013) | (2,114,442)
Others |  |  |
Provision for allowance for credit loss [Line Items] |  |  |
Allowance provided for credit loss | (70,035) | (113,662) | (90,770)
Securities at FVOCI |  |  |
Provision for allowance for credit loss [Line Items] |  |  |
Allowance provided for credit loss | (25,915) | 0 | (2,271)
Allowance Reversed For Credit Loss | 0 | 2,699 | 0
Unused credit line and financial guarantee |  |  |
Provision for allowance for credit loss [Line Items] |  |  |
Allowance provided for credit loss | 0 | (41,910) | (37,156)
Allowance Reversed For Credit Loss | 105,879 | 0 | 0
Securities at amortized cost |  |  |
Provision for allowance for credit loss [Line Items] |  |  |
Allowance Reversed For Credit Loss | ₩ 1,243 | ₩ 1,612 | ₩ 136

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- Definition Allowance provided for credit loss. + References No definition available. + Details
Name: | shg_AllowanceProvidedForCreditLoss
Namespace Prefix: | shg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | shg_AllowanceProvidedReversedForCreditLoss
Namespace Prefix: | shg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Allowance reversed for credit loss. + References No definition available. + Details
Name: | shg_AllowanceReversedForCreditLoss
Namespace Prefix: | shg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=shg_LoansAtAmortizedCostMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=ifrs-full_OtherAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=shg_UnusedCreditLineAndFinancialGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=shg_DebtSecuritiesAtAmortisedCostMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |