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Sensitivity analysis for Interest 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 Interest rates [Line Items]    
1% Increase ₩ (27,198) ₩ (32,678)
1% Decrease 27,198 32,678
Increase (decrease) of shareholder’s equity [Member]    
Disclosure of Sensitivity analysis for Interest rates [Line Items]    
1% Increase (27,198) (32,678)
1% Decrease ₩ 27,198 ₩ 32,678