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Risk Management - Summary of Fair Value Measurement of Assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value measurement of assets [line items]      
Financial assets at fair value through other comprehensive income ₩ 674,850 ₩ 502,443 ₩ 502,829
At fair value      
Disclosure of fair value measurement of assets [line items]      
Financial assets at fair value through other comprehensive income 674,850 502,443  
Derivative assets 2,691,164 1,000,394  
Financial assets at fair value through profit or loss 2,176,172 2,711,285  
Total 5,542,186 4,214,122  
At fair value | Level 1      
Disclosure of fair value measurement of assets [line items]      
Financial assets at fair value through other comprehensive income 360,096 285,054  
Derivative assets 0 0  
Financial assets at fair value through profit or loss 0 0  
Total 360,096 285,054  
At fair value | Level 2      
Disclosure of fair value measurement of assets [line items]      
Financial assets at fair value through other comprehensive income 0 0  
Derivative assets 2,691,164 1,000,394  
Financial assets at fair value through profit or loss 2,169,300 2,704,550  
Total 4,860,464 3,704,944  
At fair value | Level 3      
Disclosure of fair value measurement of assets [line items]      
Financial assets at fair value through other comprehensive income 314,754 217,389  
Derivative assets 0 0  
Financial assets at fair value through profit or loss 6,872 6,735  
Total ₩ 321,626 ₩ 224,124