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Maximum exposure to credit risk (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Cash and Cash Equivalents [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk ₩ 2,369,739 ₩ 3,051,353
Not Designated as Hedging Instrument [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 22,020 367,477
Designated as Hedging Instrument [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 10,606 413,897
Available-for-sale financial assets [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 699,833 1,014,732
Held-to-maturity investments [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 3,144 3,244
Loans and receivables [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 905,641 834,207
Long-term/short-term financial instruments [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 2,244,514 2,695,926
Financial assets at fair value through profit or loss [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 111,512  
Trade and other receivables [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk 9,683,769 9,692,391
Financial guarantee contracts [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Maximum exposure to credit risk [1] ₩ 1,154,862 ₩ 1,396,152
[1] Maximum exposure associated with the financial guarantee contracts is the maximum amounts of the obligation.