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Accounts and Other Receivables - Summary of ECLs and Credit Risk Exposures for Accounts and Other Receivables (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts Receivables        
Trade And Other Receivables [Line Items]        
Carrying amount ₩ 60,340 ₩ 32,419    
Loss allowance 579 165 ₩ 22 ₩ 123
Other Receivables        
Trade And Other Receivables [Line Items]        
Carrying amount 13 61    
Loss allowance ₩ 5 ₩ 4 ₩ 84 ₩ 46
Not due or overdue less than 90 days | Expected Credit Losses and Credit Risk Exposures | Accounts Receivables        
Trade And Other Receivables [Line Items]        
Expected loss rate 0.10% 0.30%    
Carrying amount ₩ 57,661 ₩ 31,146    
Loss allowance 54 ₩ 97    
Not due or overdue less than 90 days | Expected Credit Losses and Credit Risk Exposures | Other Receivables        
Trade And Other Receivables [Line Items]        
Expected loss rate   4.30%    
Carrying amount ₩ 8 ₩ 57    
Loss allowance   ₩ 2    
More than 90 days ~ Less than 180 days | Expected Credit Losses and Credit Risk Exposures | Accounts Receivables        
Trade And Other Receivables [Line Items]        
Expected loss rate 5.00% 3.60%    
Carrying amount ₩ 2,138 ₩ 1,213    
Loss allowance ₩ 107 ₩ 44    
More than 90 days ~ Less than 180 days | Expected Credit Losses and Credit Risk Exposures | Other Receivables        
Trade And Other Receivables [Line Items]        
Expected loss rate   32.80%    
Carrying amount   ₩ 2    
Loss allowance   ₩ 1    
More than 180 days ~ Less than 270 days | Expected Credit Losses and Credit Risk Exposures | Accounts Receivables        
Trade And Other Receivables [Line Items]        
Expected loss rate 55.30% 21.10%    
Carrying amount ₩ 276 ₩ 30    
Loss allowance ₩ 153 ₩ 6    
More than 180 days ~ Less than 270 days | Expected Credit Losses and Credit Risk Exposures | Other Receivables        
Trade And Other Receivables [Line Items]        
Expected loss rate   99.60%    
Carrying amount   ₩ 1    
Loss allowance   ₩ 1    
More than 270 days ~ Less than 1 year | Expected Credit Losses and Credit Risk Exposures | Accounts Receivables        
Trade And Other Receivables [Line Items]        
Expected loss rate 99.90% 51.90%    
Carrying amount ₩ 79 ₩ 24    
Loss allowance ₩ 79 ₩ 12    
More than 270 days ~ Less than 1 year | Expected Credit Losses and Credit Risk Exposures | Other Receivables        
Trade And Other Receivables [Line Items]        
Expected loss rate 100.00% 100.00%    
Carrying amount ₩ 5 ₩ 1    
Loss allowance ₩ 5      
More than 1 year | Expected Credit Losses and Credit Risk Exposures | Accounts Receivables        
Trade And Other Receivables [Line Items]        
Expected loss rate 100.00% 100.00%    
Carrying amount ₩ 186 ₩ 6    
Loss allowance ₩ 186 ₩ 6