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Investment Properties - Summary of Fair Value of Investment Properties (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure The fair value of investment property [Line Items]      
Investment properties ₩ 185,527 ₩ 208,286 ₩ 212,784
Land      
Disclosure The fair value of investment property [Line Items]      
Investment properties 172,594 194,417  
Buildings      
Disclosure The fair value of investment property [Line Items]      
Investment properties 12,933 13,869  
Book value      
Disclosure The fair value of investment property [Line Items]      
Investment properties 185,527 208,286  
Book value | Land      
Disclosure The fair value of investment property [Line Items]      
Investment properties 172,594 194,417  
Book value | Buildings      
Disclosure The fair value of investment property [Line Items]      
Investment properties 12,933 13,869  
Fair value      
Disclosure The fair value of investment property [Line Items]      
Investment properties 271,915 308,453  
Fair value | Land      
Disclosure The fair value of investment property [Line Items]      
Investment properties 258,478 292,827  
Fair value | Buildings      
Disclosure The fair value of investment property [Line Items]      
Investment properties ₩ 13,437 ₩ 15,626