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Employee Benefits - Expense Related to Post-employment Benefit Plans under Defined Contribution Plans (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 [abstract] |  |  |
Expense related to post-employment benefit plans under defined contribution plans | ₩ 79,817 | ₩ 81,811 | ₩ 70,394

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