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Investment properties - Summary of the fair value of investment property (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
The fair value of investment property [Line Items] |  |
Land and buildings | ₩ 1,160,058 | ₩ 741,547
At fair value [member] |  |
The fair value of investment property [Line Items] |  |
Fair value of investment property when entity applies cost model | 1,160,058 | 741,547
At fair value [member] | Market approach |  |
The fair value of investment property [Line Items] |  |
Fair value of investment property when entity applies cost model | 875,056 | 741,547
At fair value [member] | Income approach |  |
The fair value of investment property [Line Items] |  |
Fair value of investment property when entity applies cost model | ₩ 285,002 | ₩ 0

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- Definition The amount of fair value of investment property when an entity applies the cost model to measure the investment property. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2025-01-01 -Paragraph 79 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2025-en-r&anchor=para_79_e&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 271 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_271_e&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 271 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_271_e&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of property, plant and equipment representing land and depreciable buildings and similar structures for use in operations. [Refer: Buildings; Land; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 16 -IssueDate 2025-01-01 -Paragraph 37 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2025-en-r&anchor=para_37_b&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The fair value of investment property + References No definition available. + Details
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