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Investment properties - Summary of income and expenses on investment property (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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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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- 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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