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Related parties - Key management personnel compensation (Details) - KRW (₩) ₩ in Millions		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Key management personnel compensation [Abstract]
Short-term employee benefits		₩ 21,268	₩ 21,963	₩ 25,007
Severance benefits		701	824	809
Share-based payment transactions	[1]	24,840	12,478	11,862
Key management personnel compensation		₩ 46,809	₩ 35,265	₩ 37,678
[1] The above share-based compensation expenses are costs related to share-based compensation arrangements that are still within the vesting period.

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- References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2025-01-01
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-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
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-Note Effective 2027-01-01
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- References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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No definition available.

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