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Basic earnings (loss) per share (Details) - KRW (₩)
₩ / shares in Units, ₩ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Basic earnings (loss) per share [Abstract]      
Net profit (loss) for the period attributed to owner of the Company ₩ (1,314,567) ₩ 1,298,720 ₩ 7,048,581
Profit (loss) used in the calculation of total basic earnings (loss) per share ₩ (1,314,567) ₩ 1,298,720 ₩ 7,048,581
Weighted average number of common shares 641,964,077 641,964,077 641,964,077
Basic earnings (loss) per share ₩ (2,048) ₩ 2,023 ₩ 10,980