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Maximum exposure to credit risk (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Cash and Cash Equivalents    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk ₩ 2,029,584 ₩ 1,810,129
Financial assets at fair value through profit or loss    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk [1] 1,808,404 747,261
Not Designated as Hedging Instrument    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 110,764 165,204
Financial assets at amortized cost    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 14,422 13,609
Loans and receivables    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 790,162 738,707
Long-term/short-term financial instruments    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 2,062,103 1,960,227
Designated as Hedging Instrument    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 55,649 145,829
Trade and other receivables    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 9,780,039 9,703,749
Financial guarantee contracts    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk [2] ₩ 3,224,696 ₩ 3,338,566
[1] Equity investments held by the Company are excluded.
[2] Maximum exposure associated with the financial guarantee contracts is the maximum amounts of the obligation.