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Financial Risk Management - Summary of Maximum Exposure to Credit Risk (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum exposure to credit risk ₩ 243,543 ₩ 153,240
Cash and Cash Equivalents    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum exposure to credit risk 110,632 79,428
Short Term Financial Instruments    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum exposure to credit risk 71,000 39,500
Accounts Receivables    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum exposure to credit risk 59,761 32,253
Other Receivables    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum exposure to credit risk 8 56
Other Current Financial Assets    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum exposure to credit risk 818 233
Other Non-current Financial Assets    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum exposure to credit risk ₩ 1,324 ₩ 1,770