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Material accounting policies - Additional Information (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2025 KRW (₩)
Accounting Policies [Line Items]
Low value assets	₩ 6

X

- Definition

Accounting policies.

+ References

No definition available.

+ Details

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

X

- Definition

Low value asset lease.

+ References

No definition available.

+ Details

Name:	shg_LowValueAssetLease
Namespace Prefix:	shg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration