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Financial Instruments - Changes in Fair Value of Financial Assets and Financial Liabilities Classified as Level 3 (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Disclosure of fair value measurement of assets [line items] |  |
Beginning | ₩ 103,443,735 |
Ending | 105,287,678 | ₩ 103,443,735
Fair value [member] | Level 3 [member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Beginning | 1,234,777 | 875,091
Acquisition | 122,766 | 398,296
Gain on valuation of financial assets | 6,426 | 48,336
Other comprehensive income(loss) | 1,941 | (13,066)
Disposal and others | (106,619) | (73,880)
Ending | ₩ 1,259,291 | ₩ 1,234,777

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- Definition The gains (losses) including exchange differences recognised in other comprehensive income on the fair value measurement of assets. [Refer: At fair value [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2025-01-01 -Paragraph 93 -Subparagraph e -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_e_ii&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 95 -Subparagraph d -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_d_ii&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 95 -Subparagraph d -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_d_ii&doctype=Standard -URIDate 2025-03-27 + Details
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