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Financial Instruments - Summary of Carrying Amount and Fair Values of Financial Assets and Financial Liabilities by Fair value (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Short-term financial instruments | ₩ 491,841 | ₩ 1,212,643
Cash and cash equivalents | 7,049,800 | 6,767,898
Other receivables | 1,920,685 | 2,261,323
Borrowings | 28,492,000 | 25,997,367
Financial guarantee liabilities | 18,135 |
Other financial liabilities book value | 2,734,725 |
Assets measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Financial assets | 31,867,194 | 30,556,986
Liabilities measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Financial liabilities | 37,831,991 | 36,247,865
Financial assets at fair value through profit or loss [member] | Assets measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Derivative assets | 656,181 | 946,393
Short-term financial instruments | 491,841 | 1,212,643
Equity securities | 95,230 | 52,222
Debt securities | 137,647 | 113,728
Other securities | 696,148 | 762,177
Derivative hedging instruments | 6,392 | 16,483
Financial assets at fair value through other comprehensive income [member] | Assets measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Equity securities | 1,626,209 | 1,119,322
Assets held for sale | 7,276 | 604,439
Financial assets at financial assets measured at amortized cost [member] | Assets measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Debt securities | 962,120 | 402,644
Assets held for sale | 2,238 |
Cash and cash equivalents | 7,049,800 | 6,767,898
Trade accounts and notes receivable | 9,633,285 | 9,374,086
Other receivables | 3,335,169 | 2,739,523
Deposit instruments | 7,167,658 | 6,445,428
Financial liabilities at fair value through profit or loss [Member] | Liabilities measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Derivative liabilities | 41,131 | 105,187
Borrowings | 44,509 | 39,053
Derivative hedging instruments | 16,443 | 5,835
Financial liabilities measured at amortized cost [member] | Liabilities measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Trade accounts and notes payable | 5,106,921 | 6,161,177
Borrowings | 28,447,491 | 25,958,314
Financial guarantee liabilities | 18,135 | 13,916
Other payables | 4,075,379 | 3,895,526
Other financial liabilities book value | 81,982 | 68,857
Fair value [member] | Assets measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Financial assets | 3,716,924 | 4,827,407
Fair value [member] | Liabilities measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Financial liabilities | 28,748,013 | 26,317,069
Fair value [member] | Financial assets at fair value through profit or loss [member] | Assets measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Derivative assets | 656,181 | 946,393
Short-term financial instruments | 491,841 | 1,212,643
Equity securities | 95,230 | 52,222
Debt securities | 137,647 | 113,728
Other securities | 696,148 | 762,177
Derivative hedging instruments | 6,392 | 16,483
Fair value [member] | Financial assets at fair value through other comprehensive income [member] | Assets measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Equity securities | 1,626,209 | 1,119,322
Assets held for sale | 7,276 | 604,439
Fair value [member] | Financial liabilities at fair value through profit or loss [Member] | Liabilities measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Derivative liabilities | 41,129 | 105,187
Borrowings | 44,509 | 39,053
Derivative hedging instruments | 16,443 | 5,835
Fair value [member] | Financial liabilities measured at amortized cost [member] | Liabilities measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Borrowings | 28,645,932 | 26,166,994
Level 1 [member] | Fair value [member] | Assets measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Financial assets | 1,175,562 | 1,334,412
Level 1 [member] | Fair value [member] | Liabilities measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Financial liabilities | 44,509 | 39,053
Level 1 [member] | Fair value [member] | Financial assets at fair value through profit or loss [member] | Assets measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Equity securities | 16,695 | 26,792
Level 1 [member] | Fair value [member] | Financial assets at fair value through other comprehensive income [member] | Assets measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Equity securities | 1,158,867 | 703,181
Assets held for sale |  | 604,439
Level 1 [member] | Fair value [member] | Financial liabilities at fair value through profit or loss [Member] | Liabilities measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Borrowings | 44,509 | 39,053
Level 2 [member] | Fair value [member] | Assets measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Financial assets | 1,282,071 | 2,258,218
Level 2 [member] | Fair value [member] | Liabilities measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Financial liabilities | 28,703,504 | 26,278,016
Level 2 [member] | Fair value [member] | Financial assets at fair value through profit or loss [member] | Assets measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Derivative assets | 656,181 | 946,393
Short-term financial instruments | 491,841 | 1,212,643
Debt securities | 91,699 | 82,699
Derivative hedging instruments | 6,392 | 16,483
Level 2 [member] | Fair value [member] | Financial assets at fair value through other comprehensive income [member] | Assets measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Equity securities | 28,682 |
Assets held for sale | 7,276 |
Level 2 [member] | Fair value [member] | Financial liabilities at fair value through profit or loss [Member] | Liabilities measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Derivative liabilities | 41,129 | 105,187
Derivative hedging instruments | 16,443 | 5,835
Level 2 [member] | Fair value [member] | Financial liabilities measured at amortized cost [member] | Liabilities measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Borrowings | 28,645,932 | 26,166,994
Level 3 [member] | Fair value [member] | Assets measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Financial assets | 1,259,291 | 1,234,777
Level 3 [member] | Fair value [member] | Financial assets at fair value through profit or loss [member] | Assets measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Equity securities | 78,535 | 25,430
Debt securities | 45,948 | 31,029
Other securities | 696,148 | 762,177
Level 3 [member] | Fair value [member] | Financial assets at fair value through other comprehensive income [member] | Assets measured at fair value [member] |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |
Equity securities | ₩ 438,660 | ₩ 416,141

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- Definition The amount of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: At fair value [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 11A -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_11A_c&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 8 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_8_h&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 44 -Subparagraph e -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_44_e_ii&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 44 -Subparagraph e -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_44_e_ii&doctype=Standard -URIDate 2025-03-27 + Details
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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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- Definition Other financial liabilities 1. + References No definition available. + Details
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- Definition Short-term financial instruments. + References No definition available. + Details
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- Definition Trade accounts and notes receivable. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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