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Risk Management - Summary of Maximum Exposure to Credit Risk (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2022
Dec. 31, 2021
Cash and cash equivalents    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk ₩ 3,234,780 ₩ 2,635,238
Financial assets at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk [1] 3,610,408 932,736
Derivative assets (trading)    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 693,072 443,027
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 529 491
Financial assets at amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 26,998 25,273
Loans    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 1,013,371 909,071
Long-term/short-term financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 1,353,080 1,728,508
Derivative assets (applying hedge accounting)    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 324,952 204,756
Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 12,614,902 10,029,276
Financial guarantee contracts    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk [2] ₩ 3,776,060 ₩ 3,718,015
[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.