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Sensitivity analysis for Foreign currency exchange rates (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Increase (decrease) of income before income tax [Member]    
Disclosure of Sensitivity analysis for Foreign currency exchange rates [Line Items]    
10% Increase ₩ (844,122) ₩ (1,101,372)
10% Decrease 844,122 1,101,372
Increase (decrease) of shareholder’s equity [Member]    
Disclosure of Sensitivity analysis for Foreign currency exchange rates [Line Items]    
10% Increase (844,122) (1,101,372)
10% Decrease ₩ 844,122 ₩ 1,101,372