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Defined Contribution Plan - Additional Information (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Classes of employee benefits expense [abstract]      
Defined Contribution plan recognized expenses ₩ 61,912 ₩ 57,170 ₩ 48,210