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Financial Instruments - Maximum Exposure to Credit Risk (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | ₩ 31,708,876 | ₩ 30,256,184
Cash and cash equivalents [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 7,049,800 | 6,767,898
Derivative assets [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 662,573 | 962,876
Short-term financial instruments [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 491,841 | 1,212,643
Debt securities [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 1,099,767 | 516,372
Other securities [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 696,148 | 762,177
Other receivables [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 3,335,169 | 2,739,523
Trade accounts and notes receivable [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 11,203,682 | 10,849,267
Deposit instruments [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 7,167,658 | ₩ 6,445,428
Classification of assets as held for sale [member] |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | ₩ 2,238 |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 35K -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_35K_a&doctype=Standard -URIDate 2025-03-27 + Details
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- Details
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