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Insurance Risk - Summary of interest rate risk and interest rate changes on profit and loss (Details) - Interest rate risk [member] - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Interest Rate Risk Arising From Insurance Contracts [Line Items] |  |  |
Exposure to financial products measured at fair value | [1] | ₩ 47,717,387 | ₩ 48,843,348
Insurance contract exposure | [2] | 38,728,601 | 39,820,036
Net exposure (financial products - insurance contracts) |  | 8,988,786 | 9,023,312
Insurance Contract Non Participating [Member] |  |  |
Interest Rate Risk Arising From Insurance Contracts [Line Items] |  |  |
Insurance Contract Participating Exposure | [2] | 4,738,480 | 4,979,280
Insurance Contract Non Participating Exposure | [2] | 28,289,432 | 29,628,025
Insurance Contract Variable Exposure | [2] | 5,528,259 | 4,773,118
Insurance Contract Others Exposure | [2] | ₩ 172,430 | ₩ 439,613
[1] | It is the total amount of financial assets measured at fair value through profit or loss, financial assets measured at fair value through other comprehensive income, and derivative assets (liabilities).
[2] | It is the total amount excluding the contractual service margin from the remaining coverage component of insurance contract liabilities and reinsurance contract assets (liabilities).

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- Definition Exposure to financial products measured at fair value. + References No definition available. + Details
Name: | shg_ExposureToFinancialProductsMeasuredAtFairValue
Namespace Prefix: | shg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Insurance contract exposure. + References No definition available. + Details
Name: | shg_InsuranceContractExposure
Namespace Prefix: | shg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Insurance contract non participating exposure. + References No definition available. + Details
Name: | shg_InsuranceContractNonParticipatingExposure
Namespace Prefix: | shg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Insurance contract others exposure. + References No definition available. + Details
Name: | shg_InsuranceContractOthersExposure
Namespace Prefix: | shg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Insurance contract participating exposure. + References No definition available. + Details
Name: | shg_InsuranceContractParticipatingExposure
Namespace Prefix: | shg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Insurance contract variable exposure. + References No definition available. + Details
Name: | shg_InsuranceContractVariableExposure
Namespace Prefix: | shg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Interest rate risk arising from insurance contracts. + References No definition available. + Details
Name: | shg_InterestRateRiskArisingFromInsuranceContractsLineItems
Namespace Prefix: | shg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Net exposure financial products - insurance contracts. + References No definition available. + Details
Name: | shg_NetExposureFinancialProductsInsuranceContracts
Namespace Prefix: | shg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_InterestRateRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_InsuranceContractsByComponentsAxis=shg_InsuranceContractNonParticipatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |