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Employment Benefits - Additional Information (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Employment Benefit Obligations [Line Items]      
Loss on accumulated remeasurement components ₩ 98,844 ₩ 169,234  
Return on plan assets 44,325 42,352  
Construction In Process And Others      
Disclosure Of Employment Benefit Obligations [Line Items]      
Employee benefit expense 13,126 11,861 ₩ 13,893
Cost of sales      
Disclosure Of Employment Benefit Obligations [Line Items]      
Employee benefit expense 71,875 60,587 71,844
Selling and administrative expense      
Disclosure Of Employment Benefit Obligations [Line Items]      
Employee benefit expense ₩ 17,144 ₩ 9,121 ₩ 12,775