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Inventories - Additional Information (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Classes of current inventories [abstract]      
Inventories recognised as expense ₩ 3,905,630 ₩ 3,926,199 ₩ 3,855,089
Valuation loss and reversal of valuation loss ₩ 30,857 ₩ 55,288 ₩ 11,165