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Maximum exposure to credit risk (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Cash and Cash Equivalents    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk ₩ 1,810,129 ₩ 1,358,345
Financial assets at fair value through profit or loss    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 747,261 920,935
Not Designated as Hedging Instrument    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 165,204 37,631
Financial assets at amortized cost    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 13,609 14,042
Loans and receivables    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 738,707 718,674
Long-term/short-term financial instruments    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 1,960,227 2,318,027
Designated as Hedging Instrument    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 145,829 64,704
Trade and other receivables    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 9,703,749 9,613,437
Financial guarantee contracts    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk [1] ₩ 3,338,566 ₩ 1,310,817
[1] Maximum exposure associated with the financial guarantee contracts is the maximum amounts of the obligation.