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Employment Benefits - Summary of Expense Relating to Defined Benefit Plans by Nature (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]      
Defined benefit ₩ 569,520 ₩ 547,999 ₩ 781,747
Cost of sales [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit 415,959 397,442 580,623
Selling, general and administrative expense [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit 95,983 94,846 120,455
Others (Construction-in-progress and others) [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit ₩ 57,578 ₩ 55,711 ₩ 80,669