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Income tax expense - Summary of deferred tax expenses by origination and reversal of deferred assets and liabilities and temporary differences (Parenthetical) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Changes in deferred tax liability (asset) [abstract]
Decrease in deferred tax assets from overseas subsidiaries	₩ 1,128	₩ 6,721

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No definition available.

+ Details

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- Definition

Decrease in deferred tax assets from overseas subsidiaries.

+ References

No definition available.

+ Details

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Namespace Prefix:	shg_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration