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Financial risk management - Maturity analysis for derivatives parenthetical (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Carrying value
Statements [Line Items]
Demand Deposit Account Less Than 1 Month	₩ 172,840,771	₩ 160,031,760

X

- Definition

Demand deposit account Less than 1 month.

+ References

No definition available.

+ Details

Name:	shg_DemandDepositAccountLessThan1Month
Namespace Prefix:	shg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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

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- Details

Name:	ifrs-full_MeasurementAxis=shg_CarryingValueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: