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Cashflows From Disposaled subsidiaries (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Cashflows From Disposaled subsidiaries [Line Items]      
Net cash flow of Disposaled subsidiaries ₩ (15) ₩ 0 ₩ 0
Consideration received in cash      
Disclosure of Cashflows From Disposaled subsidiaries [Line Items]      
Net cash flow of Disposaled subsidiaries 160 0 898
Less: cash held by disposed subsidiaries      
Disclosure of Cashflows From Disposaled subsidiaries [Line Items]      
Net cash flow of Disposaled subsidiaries ₩ (175) ₩ 0 ₩ (898)