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Deferred tax assets and liabilities presented on a gross basis prior to any offsetting (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure - Deferred tax assets and liabilities presented on a gross basis prior to any offsetting [Abstract]      
Deferred tax assets ₩ 1,733,146 ₩ 1,437,829  
Deferred tax liabilities (9,100,247) (8,564,775)  
Net Deferred tax assets(liabilities) ₩ (7,367,101) ₩ (7,126,946) ₩ (8,383,548)