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Income tax expense - Summary of the amount of temporary difference regarding investment in subsidiaries that are not recognized as deferred tax liabilities (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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The amount of temporary difference regarding investment in subsidiaries that are not recognized as deferred tax liabilities [Abstract] |  |
Investment in subsidiaries, etc. | ₩ (10,643,726) | ₩ (10,203,270)

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- Definition The aggregate amount of temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements, for which deferred tax liabilities have not been recognised as a result of satisfying both of the following conditions: (a) the parent, investor, joint venturer or joint operator is able to control the timing of the reversal of the temporary difference; and (b) it is probable that the temporary difference will not reverse in the foreseeable future. [Refer: Total for all associates [member]; Total for all subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries reported in separate financial statements] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2025-01-01 -Paragraph 81 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2025-en-r&anchor=para_81_f&doctype=Standard -URIDate 2025-03-27 + Details
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- References No definition available. + Details
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