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Investment properties - Summary of income and expenses on investment property (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Rental income from investment property, net of direct operating expense [abstract]
Rental income	₩ 35,725	₩ 28,708	₩ 24,472
Direct operating expenses for investment properties that generated rental income	₩ 12,733	₩ 11,385	₩ 12,905

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- References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 40
-IssueDate 2025-01-01
-Paragraph 75
-Subparagraph f
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2025-en-r&anchor=para_75_f_ii&doctype=Standard
-URIDate 2025-03-27

+ Details

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Period Type:	duration

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- Definition

The amount of rental income arising from investment property recognised in profit or loss. [Refer: Investment property]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 40
-IssueDate 2025-01-01
-Paragraph 75
-Subparagraph f
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2025-en-r&anchor=para_75_f_i&doctype=Standard
-URIDate 2025-03-27

+ Details

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Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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