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Details of deductible temporary differences, tax losses and unused tax credits not recognized in the deferred income tax assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [Abstract]    
Deductible temporary differences ₩ 444,426 ₩ 426,718