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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, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of defined benefit plans [line items]
Defined benefit	₩ 400,985	₩ 539,619	₩ 569,520
Cost of sales [member]
Disclosure of defined benefit plans [line items]
Defined benefit	285,209	404,243	416,287
Selling, general and administrative expense [member]
Disclosure of defined benefit plans [line items]
Defined benefit	73,521	81,457	95,983
Others (Construction-in-progress and others) [member]
Disclosure of defined benefit plans [line items]
Defined benefit	₩ 42,255	₩ 53,919	₩ 57,250