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Investment Property - Summary of Changes in Investment Property (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Changes in investment property [abstract]    
Book value at beginning of period ₩ 27,911 ₩ 32,995
Transfer (5,331)  
Depreciation (4,558) (5,084)
Others 9  
Book value at end of period ₩ 18,031 ₩ 27,911