Intangible assets - Additional Information (Details)	12 Months Ended
Dec. 31, 2025
Disclosure of detailed information about intangible assets [abstract]
Explaration of period over which management has projected cash flow estimates	When evaluating the value in use, 5.5 years of cash flow estimates are used in projection and the value thereafter is reflected as terminal value. However, 99 years of cash flow estimates for Shinhan Life Insurance Co., Ltd. is applied and the present value of the future cash flows thereafter is not applied as it is not significant.

The explanation of the period over which management has projected cash flows based on financial budgets/forecasts approved by management including, when a period greater than five years is used for a cash-generating unit (group of units), an explanation of why that longer period is justified. [Refer: Total for all cash-generating units [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2025-01-01
-Paragraph 134
-Subparagraph d
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_134_d_iii&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2025-01-01
-Paragraph 134
-Subparagraph e
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_134_e_iii&doctype=Standard
-URIDate 2025-03-27

Name:	ifrs-full_ExplanationOfPeriodOverWhichManagementHasProjectedCashFlows
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration