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Classification of Financial Instruments - Classification of financial assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Classification by categories of financial assets [Line Items]        
Cash and cash equivalents ₩ 2,029,584 ₩ 1,810,129 ₩ 1,358,345 ₩ 2,369,739
Categories of current financial assets        
Current financial assets at fair value through profit or loss 1,196,101 131,385    
Current financial assets at amortized costs 13,149 12,302    
Current Derivative assets 29,525 27,618    
Other financial assets 1,561,445 1,415,204    
Trade and other receivables 7,918,470 7,701,452    
Total current financial assets And Cash and cash equivalents 12,748,274 11,098,090    
Non-Financial Assets        
Non-current financial assets at fair value through profit or loss 685,281 615,876    
Non-current financial assets at fair value through other comprehensive income 358,559 379,170    
Non-current financial assets at amortized costs 1,273 1,307    
Non-current Derivative assets 136,888 283,415    
Other financial assets 1,290,820 1,283,730    
Trade and other receivables 1,861,569 2,002,297    
Total non-current financial assets 4,334,390 4,565,795    
Total financial assets 17,082,664 15,663,885    
Financial assets at fair value through profit or loss        
Disclosure of Classification by categories of financial assets [Line Items]        
Cash and cash equivalents 0 0    
Categories of current financial assets        
Current financial assets at fair value through profit or loss 1,196,101 131,385    
Current financial assets at amortized costs 0 0    
Current Derivative assets 18,332 21    
Other financial assets 0 0    
Trade and other receivables 0 0    
Total current financial assets And Cash and cash equivalents 1,214,433 131,406    
Non-Financial Assets        
Non-current financial assets at fair value through profit or loss 685,281 615,876    
Non-current financial assets at fair value through other comprehensive income 0 0    
Non-current financial assets at amortized costs 0 0    
Non-current Derivative assets 92,432 165,183    
Other financial assets 0 0    
Trade and other receivables 0 0    
Total non-current financial assets 777,713 781,059    
Total financial assets 1,992,146 912,465    
Financial assets at fair value through other comprehensive income        
Disclosure of Classification by categories of financial assets [Line Items]        
Cash and cash equivalents 0 0    
Categories of current financial assets        
Current financial assets at fair value through profit or loss 0 0    
Current financial assets at amortized costs 0 0    
Current Derivative assets 0 0    
Other financial assets 0 0    
Trade and other receivables 0 0    
Total current financial assets And Cash and cash equivalents 0 0    
Non-Financial Assets        
Non-current financial assets at fair value through profit or loss 0 0    
Non-current financial assets at fair value through other comprehensive income 358,559 379,170    
Non-current financial assets at amortized costs 0 0    
Non-current Derivative assets 0 0    
Other financial assets 0 0    
Trade and other receivables 0 0    
Total non-current financial assets 358,559 379,170    
Total financial assets 358,559 379,170    
Financial assets at amortized cost        
Disclosure of Classification by categories of financial assets [Line Items]        
Cash and cash equivalents 2,029,584 1,810,129    
Categories of current financial assets        
Current financial assets at fair value through profit or loss 0 0    
Current financial assets at amortized costs 13,149 12,302    
Current Derivative assets 0 0    
Other financial assets 1,561,445 1,415,204    
Trade and other receivables 7,918,470 7,701,452    
Total current financial assets And Cash and cash equivalents 11,522,648 10,939,087    
Non-Financial Assets        
Non-current financial assets at fair value through profit or loss 0 0    
Non-current financial assets at fair value through other comprehensive income 0 0    
Non-current financial assets at amortized costs 1,273 1,307    
Non-current Derivative assets 0 0    
Other financial assets 1,290,820 1,283,730    
Trade and other receivables 1,861,569 2,002,297    
Total non-current financial assets 3,153,662 3,287,334    
Total financial assets 14,676,310 14,226,421    
Derivative assets (applying hedge accounting)        
Disclosure of Classification by categories of financial assets [Line Items]        
Cash and cash equivalents 0 0    
Categories of current financial assets        
Current financial assets at fair value through profit or loss 0 0    
Current financial assets at amortized costs 0 0    
Current Derivative assets 11,193 27,597    
Other financial assets 0 0    
Trade and other receivables 0 0    
Total current financial assets And Cash and cash equivalents 11,193 27,597    
Non-Financial Assets        
Non-current financial assets at fair value through profit or loss 0 0    
Non-current financial assets at fair value through other comprehensive income 0 0    
Non-current financial assets at amortized costs 0 0    
Non-current Derivative assets 44,456 118,232    
Other financial assets 0 0    
Trade and other receivables 0 0    
Total non-current financial assets 44,456 118,232    
Total financial assets ₩ 55,649 ₩ 145,829