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Employee Benefits - Expense Related to Post-employment Benefit Plans under Defined Contribution Plans (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
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