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Details of shares issued (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Common shares [Line Items]    
Common shares ₩ 3,209,820 ₩ 3,209,820
Owned by government [Member]    
Common shares [Line Items]    
Common shares [1] 1,640,385 1,640,385
Owned by others [Member]    
Common shares [Line Items]    
Common shares ₩ 1,569,435 ₩ 1,569,435
[1] Korea Development Bank’s ownership of ₩1,056,176 million is included.