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Deferred tax assets and liabilities presented on a gross basis prior to any offsetting (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure - Deferred tax assets and liabilities presented on a gross basis prior to any offsetting [Abstract]      
Deferred income tax assets ₩ 919,153 ₩ 795,131  
Deferred income tax liabilities (10,415,397) (8,948,520)  
Net Deferred income tax assets(liabilities) ₩ (9,496,244) ₩ (8,153,389) ₩ (7,739,060)