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Other-Financial Assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Other Financial Assets [Line Items]    
Current Other financial assets ₩ 1,991,939 ₩ 1,945,417
Non-Current Other financial assets 1,044,762 1,316,250
Loans and receivables    
Other Financial Assets [Line Items]    
Current Other financial assets 122,653 243,333
Non-Current Other financial assets 596,021 662,308
Loans and receivables | Gross amount    
Other Financial Assets [Line Items]    
Current Other financial assets 123,657 244,309
Non-Current Other financial assets 639,673 711,069
Loans and receivables | Allowance for doubtful accounts    
Other Financial Assets [Line Items]    
Current Other financial assets (12) 0
Non-Current Other financial assets (4,940) (8,948)
Loans and receivables | Present value discount    
Other Financial Assets [Line Items]    
Current Other financial assets (992) (976)
Non-Current Other financial assets (38,712) (39,813)
Short-term financial instruments    
Other Financial Assets [Line Items]    
Current Other financial assets [1] 1,869,286 1,702,084
Long-term financial instruments    
Other Financial Assets [Line Items]    
Non-Current Other financial assets [1] 448,741 542,430
Financial assets at fair value through profit or loss    
Other Financial Assets [Line Items]    
Current Other financial assets [1] 0 0
Non-Current Other financial assets [1] ₩ 0 ₩ 111,512
[1] Certain financial assets at fair value previously recognized as other financial assets is reclassified to financial assets at fair value through profit or loss upon the adoption of IFRS 9 'Financial Instruments'.