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Classification of Financial Instruments - Classification of Financial Assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]        
Cash and cash equivalents ₩ 3,234,780 ₩ 2,635,238 ₩ 2,029,584 ₩ 1,810,129
Categories of current financial assets        
Current financial assets at fair value through profit or loss 3,181,791 360,833    
Current financial assets at amortized costs 16,762 15,422    
Current Derivative assets 289,603 126,938    
Other financial assets 798,819 1,365,603    
Trade and other receivables 10,461,822 8,122,415    
Total current financial assets And Cash and cash equivalents 17,983,577 12,626,449    
Categories of Non-current Financial assets        
Non-current financial assets at fair value through profit or loss 527,717 672,031    
Non-current financial assets at fair value through other comprehensive income 502,829 435,107    
Non-current financial assets at amortized costs 10,236 9,851    
Non-current Derivative assets 728,421 520,845    
Other financial assets 1,567,632 1,271,976    
Trade and other receivables 2,153,080 1,906,861    
Total non-current financial assets 5,489,915 4,816,671    
Total financial assets 23,473,492 17,443,120    
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 3,181,791 360,833    
Current financial assets at amortized costs 0 0    
Current Derivative assets 154,730 93,374    
Other financial assets 0 0    
Trade and other receivables 0 0    
Total current financial assets And Cash and cash equivalents 3,336,521 454,207    
Categories of Non-current Financial assets        
Non-current financial assets at fair value through profit or loss 527,717 672,031    
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 538,342 349,653    
Other financial assets 0 0    
Trade and other receivables 0 0    
Total non-current financial assets 1,066,059 1,021,684    
Total financial assets 4,402,580 1,475,891    
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 502,829 435,107    
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 502,829 435,107    
Total financial assets 502,829 435,107    
Financial assets at amortized cost        
Disclosure of financial assets [line items]        
Cash and cash equivalents 3,234,780 2,635,238    
Categories of current financial assets        
Current financial assets at fair value through profit or loss 0 0    
Current financial assets at amortized costs 16,762 15,422    
Current Derivative assets 0 0    
Other financial assets 798,819 1,365,603    
Trade and other receivables 10,461,822 8,122,415    
Total current financial assets And Cash and cash equivalents 14,512,183 12,138,678    
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 10,236 9,851    
Non-current Derivative assets 0 0    
Other financial assets 1,567,632 1,271,976    
Trade and other receivables 2,153,080 1,906,861    
Total non-current financial assets 3,730,948 3,188,688    
Total financial assets 18,243,131 15,327,366    
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 134,873 33,564    
Other financial assets 0 0    
Trade and other receivables 0 0    
Total current financial assets And Cash and cash equivalents 134,873 33,564    
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 190,079 171,192    
Other financial assets 0 0    
Trade and other receivables 0 0    
Total non-current financial assets 190,079 171,192    
Total financial assets ₩ 324,952 ₩ 204,756