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Investment Properties - Additional Information (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about investment property [line items]      
Fair value of investment properties ₩ 7,773,591 ₩ 6,899,105  
Rental income from investment properties 286,700 ₩ 232,799 ₩ 224,016
Future minimum lease fee 596,829    
Less than 1 year      
Disclosure of detailed information about investment property [line items]      
Future minimum lease fee 159,993    
1-5 years      
Disclosure of detailed information about investment property [line items]      
Future minimum lease fee 329,624    
Over 5 years      
Disclosure of detailed information about investment property [line items]      
Future minimum lease fee ₩ 107,212