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Financial risk management - Credit loss allowances of financial assets (Parenthetical) (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2025	Dec. 31, 2024
Financial assets at fair value through other comprehensive income
Impairment information by credit risk of financial assets [Line Items]
Credit loss allowance recognised	₩ 60,301	₩ 38,346

X

- Definition

Allowance for credit losses of financial assets.

+ References

No definition available.

+ Details

Name:	shg_AllowanceForCreditLossesOfFinancialAssets
Namespace Prefix:	shg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	shg_ImpairmentInformationByCreditRiskOfFinancialAssetsLineItems
Namespace Prefix:	shg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: