Employment Benefits - Additional Information (Details) - KRW (₩) ₩ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure Of Employment Benefit Obligations [Line Items]
Gain (loss) on accumulated remeasurement components	₩ (95,694)	₩ 29,229
Return on plan assets	131,078	167,851
Cost of sales
Disclosure Of Employment Benefit Obligations [Line Items]
Employee benefit expense	87,998	85,560	₩ 101,369
Selling and administrative expense
Disclosure Of Employment Benefit Obligations [Line Items]
Employee benefit expense	16,221	16,012	28,301
Construction In Process And Others
Disclosure Of Employment Benefit Obligations [Line Items]
Employee benefit expense	₩ 15,701	₩ 15,639	₩ 14,827

The amount of other comprehensive income, net of tax, resulting from the return on plan assets, excluding amounts included in interest expense (income) arising from defined benefit plans. The return on plan assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Other comprehensive income; Defined benefit plans [domain]; Plan assets [member]; Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from return on plan assets excluding interest income or expense]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 135
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_135_b&doctype=Standard
-URIDate 2024-03-27

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration