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Details in number of outstanding capital stock (Details) - ₩ / shares	Dec. 31, 2017	Dec. 31, 2016
Disclosure of classes of share capital [Abstract]
Shares authorized	1,200,000,000	1,200,000,000
Shares issued	641,964,077	641,964,077
Par value per share	₩ 5,000	₩ 5,000

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The number of shares authorised.

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The number of shares issued by the entity.

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The nominal value per share.

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