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Inventories - Additional Information (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Classes of current inventories [abstract]      
Inventories recognised as expense ₩ 3,855,089 ₩ 3,589,809 ₩ 3,760,892
Valuation loss and reversal of valuation loss ₩ 11,165 ₩ (20,223) ₩ 4,116