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Diluted earnings (loss) per share (Details) - KRW (₩)
₩ / shares in Units, ₩ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Diluted earnings (loss) per share [Abstract]      
Profit (loss) used in the calculation of total diluted 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
Diluted weighted average number of shares 641,964,077 641,964,077 641,964,077
Diluted earnings (loss) per share ₩ (2,048) ₩ 2,023 ₩ 10,980