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Other-Financial Assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Other Financial Assets [Line Items]    
Current Other financial assets ₩ 1,561,445 ₩ 1,415,204
Non-Current Other financial assets 1,290,820 1,283,730
Loans and receivables    
Other Financial Assets [Line Items]    
Current Other financial assets 77,963 63,233
Non-Current Other financial assets 712,199 675,474
Loans and receivables | Gross amount    
Other Financial Assets [Line Items]    
Current Other financial assets 78,806 64,111
Non-Current Other financial assets 762,555 725,755
Loans and receivables | Allowance for doubtful accounts    
Other Financial Assets [Line Items]    
Current Other financial assets (1) (31)
Non-Current Other financial assets (20,266) (15,063)
Loans and receivables | Present value discount    
Other Financial Assets [Line Items]    
Current Other financial assets (842) (847)
Non-Current Other financial assets (30,090) (35,218)
Short-term financial instruments    
Other Financial Assets [Line Items]    
Current Other financial assets 1,483,482 1,351,971
Long-term financial instruments    
Other Financial Assets [Line Items]    
Non-Current Other financial assets ₩ 578,621 ₩ 608,256