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Risk Management - Summary of Maximum Exposure to Credit Risk (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2024
Dec. 31, 2023
Cash and cash equivalents    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk ₩ 2,382,979 ₩ 4,342,887
Financial assets at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk [1] 2,013,948 2,590,228
Derivative assets (trading)    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 1,846,527 730,948
Financial assets at fair value through other comprehensive income (debt securities)    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 5,045 4,627
Financial assets at amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 30,233 38,843
Loans    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 908,148 988,331
Long-term/short-term financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 1,960,140 1,412,315
Derivative assets (applying hedge accounting)    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 844,637 269,446
Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 15,373,625 14,179,322
Financial guarantee contracts    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk [2] ₩ 5,151,554 ₩ 4,399,189
[1] Equity investments held by the Company are excluded.
[2] Maximum exposure associated with the financial guarantee contracts is the maximum amounts of the obligation.