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Leases - Summary of the right-of-use assets by the lessee's underlying asset type (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Disclosure of quantitative information about right-of-use assets [line items] |  |
Right-of-use assets | ₩ 768,027 | ₩ 875,250
Real estate |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Right-of-use assets | 735,414 | 836,925
Vehicle |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Right-of-use assets | 21,122 | 25,993
Others |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Right-of-use assets | 11,491 | 12,332
Acquisition cost |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Right-of-use assets | 1,782,396 | 1,717,665
Acquisition cost | Real estate |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Right-of-use assets | 1,687,919 | 1,621,125
Acquisition cost | Vehicle |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Right-of-use assets | 56,741 | 57,737
Acquisition cost | Others |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Right-of-use assets | 37,736 | 38,803
Accumulated depreciation |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Right-of-use assets | (1,014,369) | (842,415)
Accumulated depreciation | Real estate |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Right-of-use assets | (952,505) | (784,200)
Accumulated depreciation | Vehicle |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Right-of-use assets | (35,619) | (31,744)
Accumulated depreciation | Others |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Right-of-use assets | ₩ (26,245) | ₩ (26,471)

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term that do not meet the definition of investment property. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2025-01-01 -Paragraph 53 -Subparagraph j -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2025-en-r&anchor=para_53_j&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2025-01-01 -Paragraph 47 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2025-en-r&anchor=para_47_a&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 115 -Subparagraph i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_115_i&doctype=Standard -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 115 -Subparagraph i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_115_i&doctype=Standard -URIDate 2025-03-27 + Details
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