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Financial Instruments - Aging and Impairment Losses of Trade Accounts and Notes Receivable and Other Receivables (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Trade accounts and notes receivable [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Financial assets | ₩ 11,778,600 | ₩ 11,215,376
Impairment | 574,918 | 366,109
Trade accounts and notes receivable [member] | Current (not due) [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Financial assets | 9,367,077 | 9,438,161
Impairment | 11,690 | 8,774
Trade accounts and notes receivable [member] | Over due less than 1 month [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Financial assets | 373,156 | 496,419
Impairment | 2,347 | 4,555
Trade accounts and notes receivable [member] | 1 month - 3 months [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Financial assets | 242,259 | 272,977
Impairment | 932 | 3,087
Trade accounts and notes receivable [member] | 3 months - 12 months [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Financial assets | 834,972 | 187,461
Impairment | 102,807 | 22,340
Trade accounts and notes receivable [member] | Over 12 months [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Financial assets | 961,136 | 820,358
Impairment | 457,142 | 327,353
Other receivables [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Financial assets | 4,125,355 | 3,487,784
Impairment | 790,186 | 748,261
Other receivables [member] | Current (not due) [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Financial assets | 3,476,605 | 2,870,906
Impairment | 459,628 | 442,293
Other receivables [member] | Over due less than 1 month [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Financial assets | 81,948 | 68,592
Impairment | 25 | 216
Other receivables [member] | 1 month - 3 months [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Financial assets | 113,474 | 146,091
Impairment | 36,268 | 19,349
Other receivables [member] | 3 months - 12 months [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Financial assets | 139,074 | 60,825
Impairment | 26,423 | 6,702
Other receivables [member] | Over 12 months [member] |  |
Disclosure of financial assets that are either past due or impaired [line items] |  |
Financial assets | 314,254 | 341,370
Impairment | ₩ 267,842 | ₩ 279,701

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Classes of financial instruments [domain]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_25&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35H&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 35M -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35M&doctype=Standard -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 35N -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35N&doctype=Standard -URIDate 2025-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 35I -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35I&doctype=Standard -URIDate 2025-03-27 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 66 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_66&doctype=Standard -URIDate 2025-03-27 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 71 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_71&doctype=Standard -URIDate 2025-03-27 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 70 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_70&doctype=Standard -URIDate 2025-03-27 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 70 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_70&doctype=Standard -URIDate 2025-03-27 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 66 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_66&doctype=Standard -URIDate 2025-03-27 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 71 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_71&doctype=Standard -URIDate 2025-03-27 + Details
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