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Dividends Paid (Details) - KRW (₩)
₩ / shares in Units, ₩ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dividends [Abstract]      
Number of shares issued 641,964,077 641,964,077 641,964,077
Treasury Stock, Common, Shares 0 0 0
Number of shares eligible for dividends 641,964,077 641,964,077 641,964,077
Dividends paid per share (In won) ₩ 1,980 ₩ 3,100 ₩ 500
Dividend paid ₩ 1,271,089 ₩ 1,990,089 ₩ 320,982