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Intangible assets - Total recoverable amount and total carrying value of CGUs to which goodwill has been allocated (Details) ₩ in Millions | Dec. 31, 2025 KRW (₩)
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Total Recoverable Amount And Total Carrying Value Of CGUs To Which Goodwill Has Been Allocated, Are As Follows [Abstract] |  |
Total recoverable amount | ₩ 63,569,922 |
Total carrying amount | 55,556,858 | [1]
Difference | ₩ 8,013,064 |
[1] | It is the carrying amount after reflecting the impairment loss in the securities.

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- Definition The amount by which a cash-generating unit's (group of units') recoverable amount exceeds its carrying amount. [Refer: Carrying amount [member]; Total for all cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2025-01-01 -Paragraph 134 -Subparagraph f -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_134_f_i&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2025-01-01 -Paragraph 135 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_135_e_i&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The higher of an asset’s (or cash-generating unit’s) fair value less costs of disposal and its value in use. [Refer: Total for all cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2025-01-01 -Paragraph 130 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_130_e&doctype=Standard -URIDate 2025-03-27 + Details
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