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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of defined benefit plans [line items]      
Defined benefit ₩ 539,619 ₩ 569,520 ₩ 547,999
Cost of sales [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit 404,243 416,287 397,442
Selling, general and administrative expense [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit 81,457 95,983 94,846
Others (Construction-in-progress and others) [member]      
Disclosure of defined benefit plans [line items]      
Defined benefit ₩ 53,919 ₩ 57,250 ₩ 55,711