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Employee Benefits - Amounts Recognized in Consolidated Statements of Comprehensive Income (Detail) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of defined benefit plans [line items] |  |  |
Current service costs | ₩ 279,517 | ₩ 266,460 | ₩ 235,340
Net interest costs | (15,285) | (19,637) | (28,726)
Amounts recognized in consolidated statements of comprehensive income | 264,232 | 246,823 | 206,614
Cost of sales | 184,140 | 155,146 | 135,687
Selling and administrative expenses and others | 80,092 | 91,677 | 70,927
Expenses by function | ₩ 264,232 | ₩ 246,823 | ₩ 206,614

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