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Risk Management - Summary of Maximum Exposure to Credit Risk (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2021
Dec. 31, 2020
Cash and Cash Equivalents    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk ₩ 2,635,238 ₩ 2,029,584
Financial assets at fair value through profit or loss    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk [1] 932,736 1,808,404
Not Designated as Hedging Instrument    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 443,027 110,764
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 491 0
Financial assets at amortized cost    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 25,273 14,422
Loans and receivables    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 909,071 790,162
Long-term/short-term financial instruments    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 1,728,508 2,062,103
Designated as Hedging Instrument    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 204,756 55,649
Trade and other receivables    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk 10,029,276 9,780,039
Financial guarantee contracts    
Disclosure of detailed information about financial instruments [line items]    
Maximum exposure to credit risk [2] ₩ 3,718,015 ₩ 3,224,696
[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.