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Maturity analysis for non-derivative financial assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items]        
Cash and cash equivalents ₩ 2,029,584 ₩ 1,810,129 ₩ 1,358,345 ₩ 2,369,739
Financial assets at fair value through other comprehensive income 358,559 379,170    
Financial assets at amortised cost 14,422 13,609    
Loans and receivables 821,094 774,772    
Long-term/short-term financial instruments 2,062,103 1,960,227    
Financial assets at fair value through profit or loss 1,881,382 747,261    
Trade and other receivables 9,784,899 9,711,107    
Financial assets held for managing liquidity risk 16,952,043 15,396,275    
Less than 1 year        
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items]        
Cash and cash equivalents 2,029,584 1,810,129    
Financial assets at fair value through other comprehensive income 0 0    
Financial assets at amortised cost 13,149 12,302    
Loans and receivables 78,805 64,081    
Long-term/short-term financial instruments 1,483,482 1,351,971    
Financial assets at fair value through profit or loss 1,196,101 131,385    
Trade and other receivables 7,920,005 7,703,746    
Financial assets held for managing liquidity risk 12,721,126 11,073,614    
1~5 Years        
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items]        
Cash and cash equivalents 0 0    
Financial assets at fair value through other comprehensive income 0 0    
Financial assets at amortised cost 1,265 1,307    
Loans and receivables 385,571 346,583    
Long-term/short-term financial instruments 252,349 269,863    
Financial assets at fair value through profit or loss 0 79    
Trade and other receivables 1,160,400 980,951    
Financial assets held for managing liquidity risk 1,799,585 1,598,783    
More than 5 years        
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items]        
Cash and cash equivalents 0 0    
Financial assets at fair value through other comprehensive income 0 0    
Financial assets at amortised cost 8 0    
Loans and receivables 325,212 336,502    
Long-term/short-term financial instruments 386 0    
Financial assets at fair value through profit or loss 2,690 0    
Trade and other receivables 704,494 818,431    
Financial assets held for managing liquidity risk 1,032,790 1,154,933    
Other        
Disclosure of maturity analysis for financial assets held for managing liquidity risk [Line Items]        
Cash and cash equivalents [1] 0 0    
Financial assets at fair value through other comprehensive income [1] 358,559 379,170    
Financial assets at amortised cost [1] 0 0    
Loans and receivables [1] 31,506 27,606    
Long-term/short-term financial instruments [1] 325,886 338,393    
Financial assets at fair value through profit or loss [1] 682,591 615,797    
Trade and other receivables [1] 0 207,979    
Financial assets held for managing liquidity risk [1] ₩ 1,398,542 ₩ 1,568,945    
[1] The maturities cannot be presently determined.