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Employee Benefits - Amounts Recognized in Consolidated Statements of Comprehensive Income (Parenthetical) (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of defined benefit plans [abstract]      
Actual return on plan assets ₩ 107,011 ₩ 133,113 ₩ 148,786