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Classification of Financial Instruments - Classification of Financial Assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial assets [line items]        
Cash and cash equivalents ₩ 2,635,238 ₩ 2,029,584 ₩ 1,810,129 ₩ 1,358,345
Categories of current financial assets        
Current financial assets at fair value through profit or loss 360,833 1,196,101    
Current financial assets at amortized costs 15,422 13,149    
Current Derivative assets 126,938 29,525    
Other financial assets 1,365,603 1,561,445    
Trade and other receivables 8,122,415 7,918,470    
Total current financial assets And Cash and cash equivalents 12,626,449 12,748,274    
Categories of Non-current Financial assets        
Non-current financial assets at fair value through profit or loss 672,031 685,281    
Non-current financial assets at fair value through other comprehensive income 435,107 358,559    
Non-current financial assets at amortized costs 9,851 1,273    
Non-current Derivative assets 520,845 136,888    
Other financial assets 1,271,976 1,290,820    
Trade and other receivables 1,906,861 1,861,569    
Total non-current financial assets 4,816,671 4,334,390    
Total financial assets 17,443,120 17,082,664    
Financial assets at fair value through profit or loss        
Disclosure 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 360,833 1,196,101    
Current financial assets at amortized costs 0 0    
Current Derivative assets 93,374 18,332    
Other financial assets 0 0    
Trade and other receivables 0 0    
Total current financial assets And Cash and cash equivalents 454,207 1,214,433    
Categories of Non-current Financial assets        
Non-current financial assets at fair value through profit or loss 672,031 685,281    
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 349,653 92,432    
Other financial assets 0 0    
Trade and other receivables 0 0    
Total non-current financial assets 1,021,684 777,713    
Total financial assets 1,475,891 1,992,146    
Financial assets at fair value through other comprehensive income        
Disclosure 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    
Categories of Non-current 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 435,107 358,559    
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 435,107 358,559    
Total financial assets 435,107 358,559    
Financial assets at amortized cost        
Disclosure of financial assets [line items]        
Cash and cash equivalents 2,635,238 2,029,584    
Categories of current financial assets        
Current financial assets at fair value through profit or loss 0 0    
Current financial assets at amortized costs 15,422 13,149    
Current Derivative assets 0 0    
Other financial assets 1,365,603 1,561,445    
Trade and other receivables 8,122,415 7,918,470    
Total current financial assets And Cash and cash equivalents 12,138,678 11,522,648    
Categories of Non-current 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 9,851 1,273    
Non-current Derivative assets 0 0    
Other financial assets 1,271,976 1,290,820    
Trade and other receivables 1,906,861 1,861,569    
Total non-current financial assets 3,188,688 3,153,662    
Total financial assets 15,327,366 14,676,310    
Derivative assets (applying hedge accounting)        
Disclosure 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 33,564 11,193    
Other financial assets 0 0    
Trade and other receivables 0 0    
Total current financial assets And Cash and cash equivalents 33,564 11,193    
Categories of Non-current 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 171,192 44,456    
Other financial assets 0 0    
Trade and other receivables 0 0    
Total non-current financial assets 171,192 44,456    
Total financial assets ₩ 204,756 ₩ 55,649