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Securities at fair value through other comprehensive income and securities at amortized cost - Additional Information (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Securities at fair value through other comprehensive income and securities at amortized cost [Abstract]
Dividends recognized related to eauity securities at fair value through other comprehensive income	₩ 71,328	₩ 86,107	₩ 60,139

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- Definition

The amount of dividends related to investments in equity instruments that the entity has designated at fair value through other comprehensive income, held at the end of the reporting period. [Refer: Investments in equity instruments designated at fair value through other comprehensive income [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 11A
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_11A_d&doctype=Standard
-URIDate 2025-03-27

+ Details

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Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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Period Type:	duration