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Basic earnings per share (Details) - KRW (₩) ₩ / shares in Units, ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Basic earnings per share [Abstract]
Net profit for the period attributed to owner of the Company	₩ 1,298,720	₩ 7,048,581	₩ 13,289,127
Profit used in the calculation of total basic earnings per share	₩ 1,298,720	₩ 7,048,581	₩ 13,289,127
Weighted average number of common shares	641,964,077	641,964,077	641,964,077
Basic earnings per share	₩ 2,023	₩ 10,980	₩ 20,701

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- Definition

The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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- Definition

The profit (loss) attributable to ordinary equity holders of the parent equity. [Refer: Profit (loss)]

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The profit (loss) attributable to owners of the parent. [Refer: Profit (loss)]

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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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