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Deferred tax assets and liabilities presented on a gross basis prior to any offsetting (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure - Deferred tax assets and liabilities presented on a gross basis prior to any offsetting [Abstract]        
Deferred tax assets ₩ 1,437,829 ₩ 1,233,761    
Deferred tax liabilities (8,564,775) (9,617,309)    
Net Deferred tax assets(liabilities) ₩ (7,126,946) ₩ (8,383,548) ₩ (9,496,244) ₩ (8,153,389)