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Financial Instruments - Allowance for Doubtful Accounts (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Disclosure of financial assets [line items] |  |  |
Allowance for doubtful accounts | ₩ 1,365,104 | ₩ 1,114,370 | ₩ 952,719
Trade accounts and notes receivable [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Allowance for doubtful accounts | 574,918 | 366,109 |
Other accounts receivable [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Allowance for doubtful accounts | 209,126 | 219,811 |
Loans [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Allowance for doubtful accounts | 571,650 | 510,036 |
Others [member] |  |  |
Disclosure of financial assets [line items] |  |  |
Allowance for doubtful accounts | ₩ 9,410 | ₩ 18,414 |

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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 Allowance for credit losses of financial assets. + References No definition available. + Details
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Balance Type: | credit
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